isl_aff.c

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/*
 * Copyright 2011      INRIA Saclay
 * Copyright 2011      Sven Verdoolaege
 * Copyright 2012-2014 Ecole Normale Superieure
 * Copyright 2014      INRIA Rocquencourt
 * Copyright 2016      Sven Verdoolaege
 * Copyright 2018,2020 Cerebras Systems
 * Copyright 2021      Sven Verdoolaege
 * Copyright 2021-2022 Cerebras Systems
 *
 * Use of this software is governed by the MIT license
 *
 * Written by Sven Verdoolaege, INRIA Saclay - Ile-de-France,
 * Parc Club Orsay Universite, ZAC des vignes, 4 rue Jacques Monod,
 * 91893 Orsay, France
 * and Ecole Normale Superieure, 45 rue d’Ulm, 75230 Paris, France
 * and Inria Paris - Rocquencourt, Domaine de Voluceau - Rocquencourt,
 * B.P. 105 - 78153 Le Chesnay, France
 * and Cerebras Systems, 175 S San Antonio Rd, Los Altos, CA, USA
 * and Cerebras Systems, 1237 E Arques Ave, Sunnyvale, CA, USA
 */
 
#include <isl_ctx_private.h>
#include <isl_map_private.h>
#include <isl_union_map_private.h>
#include <isl_aff_private.h>
#include <isl_space_private.h>
#include <isl_local_space_private.h>
#include <isl_vec_private.h>
#include <isl_mat_private.h>
#include <isl_id_private.h>
#include <isl/constraint.h>
#include <isl_seq.h>
#include <isl/set.h>
#include <isl_val_private.h>
#include <isl_point_private.h>
#include <isl_config.h>
 
#undef EL_BASE
#define EL_BASE aff
 
#include <isl_list_templ.c>
#include <isl_list_read_templ.c>
 
#undef EL_BASE
#define EL_BASE pw_aff
 
#include <isl_list_templ.c>
#include <isl_list_read_templ.c>
 
#undef EL_BASE
#define EL_BASE pw_multi_aff
 
#include <isl_list_templ.c>
#include <isl_list_read_templ.c>
 
#undef EL_BASE
#define EL_BASE union_pw_aff
 
#include <isl_list_templ.c>
#include <isl_list_read_templ.c>
 
#undef EL_BASE
#define EL_BASE union_pw_multi_aff
 
#include <isl_list_templ.c>
 
/* Construct an isl_aff from the given domain local space "ls" and
 * coefficients "v", where the local space is known to be valid
 * for an affine expression.
 */
static __isl_give isl_aff *isl_aff_alloc_vec_validated(
  __isl_take isl_local_space *ls, __isl_take isl_vec *v)
{
  isl_aff *aff;
 
  if (!ls || !v)
    goto error;
 
  aff = isl_calloc_type(v->ctx, struct isl_aff);
  if (!aff)
    goto error;
 
  aff->ref = 1;
  aff->ls = ls;
  aff->v = v;
 
  return aff;
error:
  isl_local_space_free(ls);
  isl_vec_free(v);
  return NULL;
}
 
/* Construct an isl_aff from the given domain local space "ls" and
 * coefficients "v".
 *
 * First check that "ls" is a valid domain local space
 * for an affine expression.
 */
__isl_give isl_aff *isl_aff_alloc_vec(__isl_take isl_local_space *ls,
  __isl_take isl_vec *v)
{
  isl_ctx *ctx;
 
  if (!ls)
    return NULL;
 
  ctx = isl_local_space_get_ctx(ls);
  if (!isl_local_space_divs_known(ls))
    isl_die(ctx, isl_error_invalid, "local space has unknown divs",
      goto error);
  if (!isl_local_space_is_set(ls))
    isl_die(ctx, isl_error_invalid,
      "domain of affine expression should be a set",
      goto error);
  return isl_aff_alloc_vec_validated(ls, v);
error:
  isl_local_space_free(ls);
  isl_vec_free(v);
  return NULL;
}
 
__isl_give isl_aff *isl_aff_alloc(__isl_take isl_local_space *ls)
{
  isl_ctx *ctx;
  isl_vec *v;
  isl_size total;
 
  if (!ls)
    return NULL;
 
  ctx = isl_local_space_get_ctx(ls);
 
  total = isl_local_space_dim(ls, isl_dim_all);
  if (total < 0)
    goto error;
  v = isl_vec_alloc(ctx, 1 + 1 + total);
  return isl_aff_alloc_vec(ls, v);
error:
  isl_local_space_free(ls);
  return NULL;
}
 
__isl_give isl_aff *isl_aff_copy(__isl_keep isl_aff *aff)
{
  if (!aff)
    return NULL;
 
  aff->ref++;
  return aff;
}
 
__isl_give isl_aff *isl_aff_dup(__isl_keep isl_aff *aff)
{
  if (!aff)
    return NULL;
 
  return isl_aff_alloc_vec_validated(isl_local_space_copy(aff->ls),
              isl_vec_copy(aff->v));
}
 
__isl_give isl_aff *isl_aff_cow(__isl_take isl_aff *aff)
{
  if (!aff)
    return NULL;
 
  if (aff->ref == 1)
    return aff;
  aff->ref--;
  return isl_aff_dup(aff);
}
 
/* Return a copy of the rational affine expression of "aff".
 */
static __isl_give isl_vec *isl_aff_get_rat_aff(__isl_keep isl_aff *aff)
{
  if (!aff)
    return NULL;
  return isl_vec_copy(aff->v);
}
 
/* Return the rational affine expression of "aff".
 * This may be either a copy or the expression itself
 * if there is only one reference to "aff".
 * This allows the expression to be modified inplace
 * if both the "aff" and its expression have only a single reference.
 * The caller is not allowed to modify "aff" between this call and
 * a subsequent call to isl_aff_restore_rat_aff.
 * The only exception is that isl_aff_free can be called instead.
 */
static __isl_give isl_vec *isl_aff_take_rat_aff(__isl_keep isl_aff *aff)
{
  isl_vec *v;
 
  if (!aff)
    return NULL;
  if (aff->ref != 1)
    return isl_aff_get_rat_aff(aff);
  v = aff->v;
  aff->v = NULL;
  return v;
}
 
/* Set the rational affine expression of "aff" to "v",
 * where the rational affine expression of "aff" may be missing
 * due to a preceding call to isl_aff_take_rat_aff.
 * However, in this case, "aff" only has a single reference and
 * then the call to isl_aff_cow has no effect.
 */
static __isl_give isl_aff *isl_aff_restore_rat_aff(__isl_keep isl_aff *aff,
  __isl_take isl_vec *v)
{
  if (!aff || !v)
    goto error;
 
  if (aff->v == v) {
    isl_vec_free(v);
    return aff;
  }
 
  aff = isl_aff_cow(aff);
  if (!aff)
    goto error;
  isl_vec_free(aff->v);
  aff->v = v;
 
  return aff;
error:
  isl_aff_free(aff);
  isl_vec_free(v);
  return NULL;
}
 
__isl_give isl_aff *isl_aff_zero_on_domain(__isl_take isl_local_space *ls)
{
  isl_aff *aff;
 
  aff = isl_aff_alloc(ls);
  if (!aff)
    return NULL;
 
  isl_int_set_si(aff->v->el[0], 1);
  isl_seq_clr(aff->v->el + 1, aff->v->size - 1);
 
  return aff;
}
 
/* Return an affine expression that is equal to zero on domain space "space".
 */
__isl_give isl_aff *isl_aff_zero_on_domain_space(__isl_take isl_space *space)
{
  return isl_aff_zero_on_domain(isl_local_space_from_space(space));
}
 
/* This function performs the same operation as isl_aff_zero_on_domain_space,
 * but is considered as a function on an isl_space when exported.
 */
__isl_give isl_aff *isl_space_zero_aff_on_domain(__isl_take isl_space *space)
{
  return isl_aff_zero_on_domain_space(space);
}
 
/* Return a piecewise affine expression defined on the specified domain
 * that is equal to zero.
 */
__isl_give isl_pw_aff *isl_pw_aff_zero_on_domain(__isl_take isl_local_space *ls)
{
  return isl_pw_aff_from_aff(isl_aff_zero_on_domain(ls));
}
 
/* Change "aff" into a NaN.
 *
 * Note that this function gets called from isl_aff_nan_on_domain,
 * so "aff" may not have been initialized yet.
 */
static __isl_give isl_aff *isl_aff_set_nan(__isl_take isl_aff *aff)
{
  isl_vec *v;
 
  v = isl_aff_take_rat_aff(aff);
  v = isl_vec_clr(v);
  aff = isl_aff_restore_rat_aff(aff, v);
 
  return aff;
}
 
/* Return an affine expression defined on the specified domain
 * that represents NaN.
 */
__isl_give isl_aff *isl_aff_nan_on_domain(__isl_take isl_local_space *ls)
{
  isl_aff *aff;
 
  aff = isl_aff_alloc(ls);
  return isl_aff_set_nan(aff);
}
 
/* Return an affine expression defined on the specified domain space
 * that represents NaN.
 */
__isl_give isl_aff *isl_aff_nan_on_domain_space(__isl_take isl_space *space)
{
  return isl_aff_nan_on_domain(isl_local_space_from_space(space));
}
 
/* Return a piecewise affine expression defined on the specified domain space
 * that represents NaN.
 */
__isl_give isl_pw_aff *isl_pw_aff_nan_on_domain_space(
  __isl_take isl_space *space)
{
  return isl_pw_aff_from_aff(isl_aff_nan_on_domain_space(space));
}
 
/* Return a piecewise affine expression defined on the specified domain
 * that represents NaN.
 */
__isl_give isl_pw_aff *isl_pw_aff_nan_on_domain(__isl_take isl_local_space *ls)
{
  return isl_pw_aff_from_aff(isl_aff_nan_on_domain(ls));
}
 
/* Return an affine expression that is equal to "val" on
 * domain local space "ls".
 *
 * Note that the encoding for the special value NaN
 * is the same in isl_val and isl_aff, so this does not need
 * to be treated in any special way.
 */
__isl_give isl_aff *isl_aff_val_on_domain(__isl_take isl_local_space *ls,
  __isl_take isl_val *val)
{
  isl_aff *aff;
 
  if (!ls || !val)
    goto error;
  if (!isl_val_is_rat(val) && !isl_val_is_nan(val))
    isl_die(isl_val_get_ctx(val), isl_error_invalid,
      "expecting rational value or NaN", goto error);
 
  aff = isl_aff_alloc(isl_local_space_copy(ls));
  if (!aff)
    goto error;
 
  isl_seq_clr(aff->v->el + 2, aff->v->size - 2);
  isl_int_set(aff->v->el[1], val->n);
  isl_int_set(aff->v->el[0], val->d);
 
  isl_local_space_free(ls);
  isl_val_free(val);
  return aff;
error:
  isl_local_space_free(ls);
  isl_val_free(val);
  return NULL;
}
 
/* Return an affine expression that is equal to "val" on domain space "space".
 */
__isl_give isl_aff *isl_aff_val_on_domain_space(__isl_take isl_space *space,
  __isl_take isl_val *val)
{
  return isl_aff_val_on_domain(isl_local_space_from_space(space), val);
}
 
/* Return an affine expression that is equal to the specified dimension
 * in "ls".
 */
__isl_give isl_aff *isl_aff_var_on_domain(__isl_take isl_local_space *ls,
  enum isl_dim_type type, unsigned pos)
{
  isl_space *space;
  isl_aff *aff;
 
  if (!ls)
    return NULL;
 
  space = isl_local_space_get_space(ls);
  if (!space)
    goto error;
  if (isl_space_is_map(space))
    isl_die(isl_space_get_ctx(space), isl_error_invalid,
      "expecting (parameter) set space", goto error);
  if (isl_local_space_check_range(ls, type, pos, 1) < 0)
    goto error;
 
  isl_space_free(space);
  aff = isl_aff_alloc(ls);
  if (!aff)
    return NULL;
 
  pos += isl_local_space_offset(aff->ls, type);
 
  isl_int_set_si(aff->v->el[0], 1);
  isl_seq_clr(aff->v->el + 1, aff->v->size - 1);
  isl_int_set_si(aff->v->el[1 + pos], 1);
 
  return aff;
error:
  isl_local_space_free(ls);
  isl_space_free(space);
  return NULL;
}
 
/* Return a piecewise affine expression that is equal to
 * the specified dimension in "ls".
 */
__isl_give isl_pw_aff *isl_pw_aff_var_on_domain(__isl_take isl_local_space *ls,
  enum isl_dim_type type, unsigned pos)
{
  return isl_pw_aff_from_aff(isl_aff_var_on_domain(ls, type, pos));
}
 
/* Return an affine expression that is equal to the parameter
 * in the domain space "space" with identifier "id".
 */
__isl_give isl_aff *isl_aff_param_on_domain_space_id(
  __isl_take isl_space *space, __isl_take isl_id *id)
{
  int pos;
  isl_local_space *ls;
 
  if (!space || !id)
    goto error;
  pos = isl_space_find_dim_by_id(space, isl_dim_param, id);
  if (pos < 0)
    isl_die(isl_space_get_ctx(space), isl_error_invalid,
      "parameter not found in space", goto error);
  isl_id_free(id);
  ls = isl_local_space_from_space(space);
  return isl_aff_var_on_domain(ls, isl_dim_param, pos);
error:
  isl_space_free(space);
  isl_id_free(id);
  return NULL;
}
 
/* This function performs the same operation as
 * isl_aff_param_on_domain_space_id,
 * but is considered as a function on an isl_space when exported.
 */
__isl_give isl_aff *isl_space_param_aff_on_domain_id(
  __isl_take isl_space *space, __isl_take isl_id *id)
{
  return isl_aff_param_on_domain_space_id(space, id);
}
 
__isl_null isl_aff *isl_aff_free(__isl_take isl_aff *aff)
{
  if (!aff)
    return NULL;
 
  if (--aff->ref > 0)
    return NULL;
 
  isl_local_space_free(aff->ls);
  isl_vec_free(aff->v);
 
  free(aff);
 
  return NULL;
}
 
isl_ctx *isl_aff_get_ctx(__isl_keep isl_aff *aff)
{
  return aff ? isl_local_space_get_ctx(aff->ls) : NULL;
}
 
/* Return a hash value that digests "aff".
 */
uint32_t isl_aff_get_hash(__isl_keep isl_aff *aff)
{
  uint32_t hash, ls_hash, v_hash;
 
  if (!aff)
    return 0;
 
  hash = isl_hash_init();
  ls_hash = isl_local_space_get_hash(aff->ls);
  isl_hash_hash(hash, ls_hash);
  v_hash = isl_vec_get_hash(aff->v);
  isl_hash_hash(hash, v_hash);
 
  return hash;
}
 
/* Return the domain local space of "aff".
 */
static __isl_keep isl_local_space *isl_aff_peek_domain_local_space(
  __isl_keep isl_aff *aff)
{
  return aff ? aff->ls : NULL;
}
 
/* Return the number of variables of the given type in the domain of "aff".
 */
isl_size isl_aff_domain_dim(__isl_keep isl_aff *aff, enum isl_dim_type type)
{
  isl_local_space *ls;
 
  ls = isl_aff_peek_domain_local_space(aff);
  return isl_local_space_dim(ls, type);
}
 
/* Externally, an isl_aff has a map space, but internally, the
 * ls field corresponds to the domain of that space.
 */
isl_size isl_aff_dim(__isl_keep isl_aff *aff, enum isl_dim_type type)
{
  if (!aff)
    return isl_size_error;
  if (type == isl_dim_out)
    return 1;
  if (type == isl_dim_in)
    type = isl_dim_set;
  return isl_aff_domain_dim(aff, type);
}
 
/* Return the offset of the first variable of type "type" within
 * the variables of the domain of "aff".
 */
static isl_size isl_aff_domain_var_offset(__isl_keep isl_aff *aff,
  enum isl_dim_type type)
{
  isl_local_space *ls;
 
  ls = isl_aff_peek_domain_local_space(aff);
  return isl_local_space_var_offset(ls, type);
}
 
/* Return the offset of the first coefficient of type "type" in
 * the domain of "aff".
 */
isl_size isl_aff_domain_offset(__isl_keep isl_aff *aff, enum isl_dim_type type)
{
  isl_size offset;
 
  offset = isl_aff_domain_var_offset(aff, type);
  if (offset < 0)
    return isl_size_error;
  return 1 + offset;
}
 
/* Return the position of the dimension of the given type and name
 * in "aff".
 * Return -1 if no such dimension can be found.
 */
int isl_aff_find_dim_by_name(__isl_keep isl_aff *aff, enum isl_dim_type type,
  const char *name)
{
  if (!aff)
    return -1;
  if (type == isl_dim_out)
    return -1;
  if (type == isl_dim_in)
    type = isl_dim_set;
  return isl_local_space_find_dim_by_name(aff->ls, type, name);
}
 
/* Return the domain space of "aff".
 */
static __isl_keep isl_space *isl_aff_peek_domain_space(__isl_keep isl_aff *aff)
{
  return aff ? isl_local_space_peek_space(aff->ls) : NULL;
}
 
__isl_give isl_space *isl_aff_get_domain_space(__isl_keep isl_aff *aff)
{
  return isl_space_copy(isl_aff_peek_domain_space(aff));
}
 
__isl_give isl_space *isl_aff_get_space(__isl_keep isl_aff *aff)
{
  isl_space *space;
  if (!aff)
    return NULL;
  space = isl_local_space_get_space(aff->ls);
  space = isl_space_from_domain(space);
  space = isl_space_add_dims(space, isl_dim_out, 1);
  return space;
}
 
/* Return a copy of the domain space of "aff".
 */
__isl_give isl_local_space *isl_aff_get_domain_local_space(
  __isl_keep isl_aff *aff)
{
  return isl_local_space_copy(isl_aff_peek_domain_local_space(aff));
}
 
__isl_give isl_local_space *isl_aff_get_local_space(__isl_keep isl_aff *aff)
{
  isl_local_space *ls;
  if (!aff)
    return NULL;
  ls = isl_local_space_copy(aff->ls);
  ls = isl_local_space_from_domain(ls);
  ls = isl_local_space_add_dims(ls, isl_dim_out, 1);
  return ls;
}
 
/* Return the local space of the domain of "aff".
 * This may be either a copy or the local space itself
 * if there is only one reference to "aff".
 * This allows the local space to be modified inplace
 * if both the expression and its local space have only a single reference.
 * The caller is not allowed to modify "aff" between this call and
 * a subsequent call to isl_aff_restore_domain_local_space.
 * The only exception is that isl_aff_free can be called instead.
 */
__isl_give isl_local_space *isl_aff_take_domain_local_space(
  __isl_keep isl_aff *aff)
{
  isl_local_space *ls;
 
  if (!aff)
    return NULL;
  if (aff->ref != 1)
    return isl_aff_get_domain_local_space(aff);
  ls = aff->ls;
  aff->ls = NULL;
  return ls;
}
 
/* Set the local space of the domain of "aff" to "ls",
 * where the local space of "aff" may be missing
 * due to a preceding call to isl_aff_take_domain_local_space.
 * However, in this case, "aff" only has a single reference and
 * then the call to isl_aff_cow has no effect.
 */
__isl_give isl_aff *isl_aff_restore_domain_local_space(
  __isl_keep isl_aff *aff, __isl_take isl_local_space *ls)
{
  if (!aff || !ls)
    goto error;
 
  if (aff->ls == ls) {
    isl_local_space_free(ls);
    return aff;
  }
 
  aff = isl_aff_cow(aff);
  if (!aff)
    goto error;
  isl_local_space_free(aff->ls);
  aff->ls = ls;
 
  return aff;
error:
  isl_aff_free(aff);
  isl_local_space_free(ls);
  return NULL;
}
 
/* Externally, an isl_aff has a map space, but internally, the
 * ls field corresponds to the domain of that space.
 */
const char *isl_aff_get_dim_name(__isl_keep isl_aff *aff,
  enum isl_dim_type type, unsigned pos)
{
  if (!aff)
    return NULL;
  if (type == isl_dim_out)
    return NULL;
  if (type == isl_dim_in)
    type = isl_dim_set;
  return isl_local_space_get_dim_name(aff->ls, type, pos);
}
 
__isl_give isl_aff *isl_aff_reset_domain_space(__isl_take isl_aff *aff,
  __isl_take isl_space *space)
{
  aff = isl_aff_cow(aff);
  if (!aff || !space)
    goto error;
 
  aff->ls = isl_local_space_reset_space(aff->ls, space);
  if (!aff->ls)
    return isl_aff_free(aff);
 
  return aff;
error:
  isl_aff_free(aff);
  isl_space_free(space);
  return NULL;
}
 
/* Reset the space of "aff".  This function is called from isl_pw_templ.c
 * and doesn't know if the space of an element object is represented
 * directly or through its domain.  It therefore passes along both.
 */
__isl_give isl_aff *isl_aff_reset_space_and_domain(__isl_take isl_aff *aff,
  __isl_take isl_space *space, __isl_take isl_space *domain)
{
  isl_space_free(space);
  return isl_aff_reset_domain_space(aff, domain);
}
 
/* Reorder the dimensions of the domain of "aff" according
 * to the given reordering.
 */
__isl_give isl_aff *isl_aff_realign_domain(__isl_take isl_aff *aff,
  __isl_take isl_reordering *r)
{
  aff = isl_aff_cow(aff);
  if (!aff)
    goto error;
 
  r = isl_reordering_extend(r, aff->ls->div->n_row);
  aff->v = isl_vec_reorder(aff->v, 2, isl_reordering_copy(r));
  aff->ls = isl_local_space_realign(aff->ls, r);
 
  if (!aff->v || !aff->ls)
    return isl_aff_free(aff);
 
  return aff;
error:
  isl_aff_free(aff);
  isl_reordering_free(r);
  return NULL;
}
 
__isl_give isl_aff *isl_aff_align_params(__isl_take isl_aff *aff,
  __isl_take isl_space *model)
{
  isl_space *domain_space;
  isl_bool equal_params;
 
  domain_space = isl_aff_peek_domain_space(aff);
  equal_params = isl_space_has_equal_params(domain_space, model);
  if (equal_params < 0)
    goto error;
  if (!equal_params) {
    isl_reordering *exp;
 
    exp = isl_parameter_alignment_reordering(domain_space, model);
    aff = isl_aff_realign_domain(aff, exp);
  }
 
  isl_space_free(model);
  return aff;
error:
  isl_space_free(model);
  isl_aff_free(aff);
  return NULL;
}
 
#undef TYPE
#define TYPE isl_aff
#include "isl_unbind_params_templ.c"
 
/* Is "aff" obviously equal to zero?
 *
 * If the denominator is zero, then "aff" is not equal to zero.
 */
isl_bool isl_aff_plain_is_zero(__isl_keep isl_aff *aff)
{
  int pos;
 
  if (!aff)
    return isl_bool_error;
 
  if (isl_int_is_zero(aff->v->el[0]))
    return isl_bool_false;
  pos = isl_seq_first_non_zero(aff->v->el + 1, aff->v->size - 1);
  return isl_bool_ok(pos < 0);
}
 
/* Does "aff" represent NaN?
 */
isl_bool isl_aff_is_nan(__isl_keep isl_aff *aff)
{
  if (!aff)
    return isl_bool_error;
 
  return isl_bool_ok(!isl_seq_any_non_zero(aff->v->el, 2));
}
 
/* Are "aff1" and "aff2" obviously equal?
 *
 * NaN is not equal to anything, not even to another NaN.
 */
isl_bool isl_aff_plain_is_equal(__isl_keep isl_aff *aff1,
  __isl_keep isl_aff *aff2)
{
  isl_bool equal;
 
  if (!aff1 || !aff2)
    return isl_bool_error;
 
  if (isl_aff_is_nan(aff1) || isl_aff_is_nan(aff2))
    return isl_bool_false;
 
  equal = isl_local_space_is_equal(aff1->ls, aff2->ls);
  if (equal < 0 || !equal)
    return equal;
 
  return isl_vec_is_equal(aff1->v, aff2->v);
}
 
/* Return the common denominator of "aff" in "v".
 *
 * We cannot return anything meaningful in case of a NaN.
 */
isl_stat isl_aff_get_denominator(__isl_keep isl_aff *aff, isl_int *v)
{
  if (!aff)
    return isl_stat_error;
  if (isl_aff_is_nan(aff))
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "cannot get denominator of NaN", return isl_stat_error);
  isl_int_set(*v, aff->v->el[0]);
  return isl_stat_ok;
}
 
/* Return the common denominator of "aff".
 */
__isl_give isl_val *isl_aff_get_denominator_val(__isl_keep isl_aff *aff)
{
  isl_ctx *ctx;
 
  if (!aff)
    return NULL;
 
  ctx = isl_aff_get_ctx(aff);
  if (isl_aff_is_nan(aff))
    return isl_val_nan(ctx);
  return isl_val_int_from_isl_int(ctx, aff->v->el[0]);
}
 
/* Return the constant term of "aff".
 */
__isl_give isl_val *isl_aff_get_constant_val(__isl_keep isl_aff *aff)
{
  isl_ctx *ctx;
  isl_val *v;
 
  if (!aff)
    return NULL;
 
  ctx = isl_aff_get_ctx(aff);
  if (isl_aff_is_nan(aff))
    return isl_val_nan(ctx);
  v = isl_val_rat_from_isl_int(ctx, aff->v->el[1], aff->v->el[0]);
  return isl_val_normalize(v);
}
 
/* Return the coefficient of the variable of type "type" at position "pos"
 * of "aff".
 */
__isl_give isl_val *isl_aff_get_coefficient_val(__isl_keep isl_aff *aff,
  enum isl_dim_type type, int pos)
{
  isl_ctx *ctx;
  isl_val *v;
 
  if (!aff)
    return NULL;
 
  ctx = isl_aff_get_ctx(aff);
  if (type == isl_dim_out)
    isl_die(ctx, isl_error_invalid,
      "output/set dimension does not have a coefficient",
      return NULL);
  if (type == isl_dim_in)
    type = isl_dim_set;
 
  if (isl_local_space_check_range(aff->ls, type, pos, 1) < 0)
    return NULL;
 
  if (isl_aff_is_nan(aff))
    return isl_val_nan(ctx);
  pos += isl_local_space_offset(aff->ls, type);
  v = isl_val_rat_from_isl_int(ctx, aff->v->el[1 + pos], aff->v->el[0]);
  return isl_val_normalize(v);
}
 
/* Return the sign of the coefficient of the variable of type "type"
 * at position "pos" of "aff".
 */
int isl_aff_coefficient_sgn(__isl_keep isl_aff *aff, enum isl_dim_type type,
  int pos)
{
  isl_ctx *ctx;
 
  if (!aff)
    return 0;
 
  ctx = isl_aff_get_ctx(aff);
  if (type == isl_dim_out)
    isl_die(ctx, isl_error_invalid,
      "output/set dimension does not have a coefficient",
      return 0);
  if (type == isl_dim_in)
    type = isl_dim_set;
 
  if (isl_local_space_check_range(aff->ls, type, pos, 1) < 0)
    return 0;
 
  pos += isl_local_space_offset(aff->ls, type);
  return isl_int_sgn(aff->v->el[1 + pos]);
}
 
/* Replace the numerator of the constant term of "aff" by "v".
 *
 * A NaN is unaffected by this operation.
 */
__isl_give isl_aff *isl_aff_set_constant(__isl_take isl_aff *aff, isl_int v)
{
  if (!aff)
    return NULL;
  if (isl_aff_is_nan(aff))
    return aff;
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  isl_int_set(aff->v->el[1], v);
 
  return aff;
}
 
/* Replace the constant term of "aff" by "v".
 *
 * A NaN is unaffected by this operation.
 */
__isl_give isl_aff *isl_aff_set_constant_val(__isl_take isl_aff *aff,
  __isl_take isl_val *v)
{
  if (!aff || !v)
    goto error;
 
  if (isl_aff_is_nan(aff)) {
    isl_val_free(v);
    return aff;
  }
 
  if (!isl_val_is_rat(v))
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "expecting rational value", goto error);
 
  if (isl_int_eq(aff->v->el[1], v->n) &&
      isl_int_eq(aff->v->el[0], v->d)) {
    isl_val_free(v);
    return aff;
  }
 
  aff = isl_aff_cow(aff);
  if (!aff)
    goto error;
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    goto error;
 
  if (isl_int_eq(aff->v->el[0], v->d)) {
    isl_int_set(aff->v->el[1], v->n);
  } else if (isl_int_is_one(v->d)) {
    isl_int_mul(aff->v->el[1], aff->v->el[0], v->n);
  } else {
    isl_seq_scale(aff->v->el + 1,
        aff->v->el + 1, v->d, aff->v->size - 1);
    isl_int_mul(aff->v->el[1], aff->v->el[0], v->n);
    isl_int_mul(aff->v->el[0], aff->v->el[0], v->d);
    aff->v = isl_vec_normalize(aff->v);
    if (!aff->v)
      goto error;
  }
 
  isl_val_free(v);
  return aff;
error:
  isl_aff_free(aff);
  isl_val_free(v);
  return NULL;
}
 
/* Add "v" to the constant term of "aff".
 *
 * A NaN is unaffected by this operation.
 */
__isl_give isl_aff *isl_aff_add_constant(__isl_take isl_aff *aff, isl_int v)
{
  if (isl_int_is_zero(v))
    return aff;
 
  if (!aff)
    return NULL;
  if (isl_aff_is_nan(aff))
    return aff;
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  isl_int_addmul(aff->v->el[1], aff->v->el[0], v);
 
  return aff;
}
 
/* Add "v" to the constant term of "aff",
 * in case "aff" is a rational expression.
 */
static __isl_give isl_aff *isl_aff_add_rat_constant_val(__isl_take isl_aff *aff,
  __isl_take isl_val *v)
{
  aff = isl_aff_cow(aff);
  if (!aff)
    goto error;
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    goto error;
 
  if (isl_int_is_one(v->d)) {
    isl_int_addmul(aff->v->el[1], aff->v->el[0], v->n);
  } else if (isl_int_eq(aff->v->el[0], v->d)) {
    isl_int_add(aff->v->el[1], aff->v->el[1], v->n);
    aff->v = isl_vec_normalize(aff->v);
    if (!aff->v)
      goto error;
  } else {
    isl_seq_scale(aff->v->el + 1,
        aff->v->el + 1, v->d, aff->v->size - 1);
    isl_int_addmul(aff->v->el[1], aff->v->el[0], v->n);
    isl_int_mul(aff->v->el[0], aff->v->el[0], v->d);
    aff->v = isl_vec_normalize(aff->v);
    if (!aff->v)
      goto error;
  }
 
  isl_val_free(v);
  return aff;
error:
  isl_aff_free(aff);
  isl_val_free(v);
  return NULL;
}
 
/* Return the first argument and free the second.
 */
static __isl_give isl_aff *pick_free(__isl_take isl_aff *aff,
  __isl_take isl_val *v)
{
  isl_val_free(v);
  return aff;
}
 
/* Replace the first argument by NaN and free the second argument.
 */
static __isl_give isl_aff *set_nan_free_val(__isl_take isl_aff *aff,
  __isl_take isl_val *v)
{
  isl_val_free(v);
  return isl_aff_set_nan(aff);
}
 
/* Add "v" to the constant term of "aff".
 *
 * A NaN is unaffected by this operation.
 * Conversely, adding a NaN turns "aff" into a NaN.
 */
__isl_give isl_aff *isl_aff_add_constant_val(__isl_take isl_aff *aff,
  __isl_take isl_val *v)
{
  isl_bool is_nan, is_zero, is_rat;
 
  is_nan = isl_aff_is_nan(aff);
  is_zero = isl_val_is_zero(v);
  if (is_nan < 0 || is_zero < 0)
    goto error;
  if (is_nan || is_zero)
    return pick_free(aff, v);
 
  is_nan = isl_val_is_nan(v);
  is_rat = isl_val_is_rat(v);
  if (is_nan < 0 || is_rat < 0)
    goto error;
  if (is_nan)
    return set_nan_free_val(aff, v);
  if (!is_rat)
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "expecting rational value or NaN", goto error);
 
  return isl_aff_add_rat_constant_val(aff, v);
error:
  isl_aff_free(aff);
  isl_val_free(v);
  return NULL;
}
 
__isl_give isl_aff *isl_aff_add_constant_si(__isl_take isl_aff *aff, int v)
{
  isl_int t;
 
  isl_int_init(t);
  isl_int_set_si(t, v);
  aff = isl_aff_add_constant(aff, t);
  isl_int_clear(t);
 
  return aff;
}
 
/* Add "v" to the numerator of the constant term of "aff".
 *
 * A NaN is unaffected by this operation.
 */
__isl_give isl_aff *isl_aff_add_constant_num(__isl_take isl_aff *aff, isl_int v)
{
  if (isl_int_is_zero(v))
    return aff;
 
  if (!aff)
    return NULL;
  if (isl_aff_is_nan(aff))
    return aff;
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  isl_int_add(aff->v->el[1], aff->v->el[1], v);
 
  return aff;
}
 
/* Add "v" to the numerator of the constant term of "aff".
 *
 * A NaN is unaffected by this operation.
 */
__isl_give isl_aff *isl_aff_add_constant_num_si(__isl_take isl_aff *aff, int v)
{
  isl_int t;
 
  if (v == 0)
    return aff;
 
  isl_int_init(t);
  isl_int_set_si(t, v);
  aff = isl_aff_add_constant_num(aff, t);
  isl_int_clear(t);
 
  return aff;
}
 
/* Replace the numerator of the constant term of "aff" by "v".
 *
 * A NaN is unaffected by this operation.
 */
__isl_give isl_aff *isl_aff_set_constant_si(__isl_take isl_aff *aff, int v)
{
  if (!aff)
    return NULL;
  if (isl_aff_is_nan(aff))
    return aff;
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  isl_int_set_si(aff->v->el[1], v);
 
  return aff;
}
 
/* Replace the numerator of the coefficient of the variable of type "type"
 * at position "pos" of "aff" by "v".
 *
 * A NaN is unaffected by this operation.
 */
__isl_give isl_aff *isl_aff_set_coefficient(__isl_take isl_aff *aff,
  enum isl_dim_type type, int pos, isl_int v)
{
  if (!aff)
    return NULL;
 
  if (type == isl_dim_out)
    isl_die(aff->v->ctx, isl_error_invalid,
      "output/set dimension does not have a coefficient",
      return isl_aff_free(aff));
  if (type == isl_dim_in)
    type = isl_dim_set;
 
  if (isl_local_space_check_range(aff->ls, type, pos, 1) < 0)
    return isl_aff_free(aff);
 
  if (isl_aff_is_nan(aff))
    return aff;
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  pos += isl_local_space_offset(aff->ls, type);
  isl_int_set(aff->v->el[1 + pos], v);
 
  return aff;
}
 
/* Replace the numerator of the coefficient of the variable of type "type"
 * at position "pos" of "aff" by "v".
 *
 * A NaN is unaffected by this operation.
 */
__isl_give isl_aff *isl_aff_set_coefficient_si(__isl_take isl_aff *aff,
  enum isl_dim_type type, int pos, int v)
{
  if (!aff)
    return NULL;
 
  if (type == isl_dim_out)
    isl_die(aff->v->ctx, isl_error_invalid,
      "output/set dimension does not have a coefficient",
      return isl_aff_free(aff));
  if (type == isl_dim_in)
    type = isl_dim_set;
 
  if (isl_local_space_check_range(aff->ls, type, pos, 1) < 0)
    return isl_aff_free(aff);
 
  if (isl_aff_is_nan(aff))
    return aff;
  pos += isl_local_space_offset(aff->ls, type);
  if (isl_int_cmp_si(aff->v->el[1 + pos], v) == 0)
    return aff;
 
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  isl_int_set_si(aff->v->el[1 + pos], v);
 
  return aff;
}
 
/* Replace the coefficient of the variable of type "type" at position "pos"
 * of "aff" by "v".
 *
 * A NaN is unaffected by this operation.
 */
__isl_give isl_aff *isl_aff_set_coefficient_val(__isl_take isl_aff *aff,
  enum isl_dim_type type, int pos, __isl_take isl_val *v)
{
  if (!aff || !v)
    goto error;
 
  if (type == isl_dim_out)
    isl_die(aff->v->ctx, isl_error_invalid,
      "output/set dimension does not have a coefficient",
      goto error);
  if (type == isl_dim_in)
    type = isl_dim_set;
 
  if (isl_local_space_check_range(aff->ls, type, pos, 1) < 0)
    return isl_aff_free(aff);
 
  if (isl_aff_is_nan(aff)) {
    isl_val_free(v);
    return aff;
  }
  if (!isl_val_is_rat(v))
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "expecting rational value", goto error);
 
  pos += isl_local_space_offset(aff->ls, type);
  if (isl_int_eq(aff->v->el[1 + pos], v->n) &&
      isl_int_eq(aff->v->el[0], v->d)) {
    isl_val_free(v);
    return aff;
  }
 
  aff = isl_aff_cow(aff);
  if (!aff)
    goto error;
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    goto error;
 
  if (isl_int_eq(aff->v->el[0], v->d)) {
    isl_int_set(aff->v->el[1 + pos], v->n);
  } else if (isl_int_is_one(v->d)) {
    isl_int_mul(aff->v->el[1 + pos], aff->v->el[0], v->n);
  } else {
    isl_seq_scale(aff->v->el + 1,
        aff->v->el + 1, v->d, aff->v->size - 1);
    isl_int_mul(aff->v->el[1 + pos], aff->v->el[0], v->n);
    isl_int_mul(aff->v->el[0], aff->v->el[0], v->d);
    aff->v = isl_vec_normalize(aff->v);
    if (!aff->v)
      goto error;
  }
 
  isl_val_free(v);
  return aff;
error:
  isl_aff_free(aff);
  isl_val_free(v);
  return NULL;
}
 
/* Add "v" to the coefficient of the variable of type "type"
 * at position "pos" of "aff".
 *
 * A NaN is unaffected by this operation.
 */
__isl_give isl_aff *isl_aff_add_coefficient(__isl_take isl_aff *aff,
  enum isl_dim_type type, int pos, isl_int v)
{
  if (!aff)
    return NULL;
 
  if (type == isl_dim_out)
    isl_die(aff->v->ctx, isl_error_invalid,
      "output/set dimension does not have a coefficient",
      return isl_aff_free(aff));
  if (type == isl_dim_in)
    type = isl_dim_set;
 
  if (isl_local_space_check_range(aff->ls, type, pos, 1) < 0)
    return isl_aff_free(aff);
 
  if (isl_aff_is_nan(aff))
    return aff;
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  pos += isl_local_space_offset(aff->ls, type);
  isl_int_addmul(aff->v->el[1 + pos], aff->v->el[0], v);
 
  return aff;
}
 
/* Add "v" to the coefficient of the variable of type "type"
 * at position "pos" of "aff".
 *
 * A NaN is unaffected by this operation.
 */
__isl_give isl_aff *isl_aff_add_coefficient_val(__isl_take isl_aff *aff,
  enum isl_dim_type type, int pos, __isl_take isl_val *v)
{
  if (!aff || !v)
    goto error;
 
  if (isl_val_is_zero(v)) {
    isl_val_free(v);
    return aff;
  }
 
  if (type == isl_dim_out)
    isl_die(aff->v->ctx, isl_error_invalid,
      "output/set dimension does not have a coefficient",
      goto error);
  if (type == isl_dim_in)
    type = isl_dim_set;
 
  if (isl_local_space_check_range(aff->ls, type, pos, 1) < 0)
    goto error;
 
  if (isl_aff_is_nan(aff)) {
    isl_val_free(v);
    return aff;
  }
  if (!isl_val_is_rat(v))
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "expecting rational value", goto error);
 
  aff = isl_aff_cow(aff);
  if (!aff)
    goto error;
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    goto error;
 
  pos += isl_local_space_offset(aff->ls, type);
  if (isl_int_is_one(v->d)) {
    isl_int_addmul(aff->v->el[1 + pos], aff->v->el[0], v->n);
  } else if (isl_int_eq(aff->v->el[0], v->d)) {
    isl_int_add(aff->v->el[1 + pos], aff->v->el[1 + pos], v->n);
    aff->v = isl_vec_normalize(aff->v);
    if (!aff->v)
      goto error;
  } else {
    isl_seq_scale(aff->v->el + 1,
        aff->v->el + 1, v->d, aff->v->size - 1);
    isl_int_addmul(aff->v->el[1 + pos], aff->v->el[0], v->n);
    isl_int_mul(aff->v->el[0], aff->v->el[0], v->d);
    aff->v = isl_vec_normalize(aff->v);
    if (!aff->v)
      goto error;
  }
 
  isl_val_free(v);
  return aff;
error:
  isl_aff_free(aff);
  isl_val_free(v);
  return NULL;
}
 
__isl_give isl_aff *isl_aff_add_coefficient_si(__isl_take isl_aff *aff,
  enum isl_dim_type type, int pos, int v)
{
  isl_int t;
 
  isl_int_init(t);
  isl_int_set_si(t, v);
  aff = isl_aff_add_coefficient(aff, type, pos, t);
  isl_int_clear(t);
 
  return aff;
}
 
__isl_give isl_aff *isl_aff_get_div(__isl_keep isl_aff *aff, int pos)
{
  if (!aff)
    return NULL;
 
  return isl_local_space_get_div(aff->ls, pos);
}
 
/* Return the negation of "aff".
 *
 * As a special case, -NaN = NaN.
 */
__isl_give isl_aff *isl_aff_neg(__isl_take isl_aff *aff)
{
  if (!aff)
    return NULL;
  if (isl_aff_is_nan(aff))
    return aff;
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  isl_seq_neg(aff->v->el + 1, aff->v->el + 1, aff->v->size - 1);
 
  return aff;
}
 
/* Remove divs from the local space that do not appear in the affine
 * expression.
 *
 * First remove any unused local variables at the end.
 * Then look for other unused local variables.  These need some extra care
 * because a local variable that does not appear in the affine expression
 * may still appear in the definition of some later local variable.
 */
__isl_give isl_aff *isl_aff_remove_unused_divs(__isl_take isl_aff *aff)
{
  int pos;
  isl_size v_div;
  isl_size n;
  int *active;
  isl_local_space *ls;
 
  n = isl_aff_domain_dim(aff, isl_dim_div);
  v_div = isl_aff_domain_var_offset(aff, isl_dim_div);
  if (n < 0 || v_div < 0)
    return isl_aff_free(aff);
 
  pos = isl_seq_last_non_zero(aff->v->el + 1 + 1 + v_div, n) + 1;
  if (pos < n)
    aff = isl_aff_drop_dims(aff, isl_dim_div, pos, n - pos);
  if (pos <= 1 || !aff)
    return aff;
 
  ls = isl_aff_peek_domain_local_space(aff);
  active = isl_local_space_get_active(ls, aff->v->el + 2);
  if (!active)
    return isl_aff_free(aff);
  for (pos = pos - 2; pos >= 0; pos--) {
    if (active[v_div + pos])
      continue;
    aff = isl_aff_drop_dims(aff, isl_dim_div, pos, 1);
  }
  free(active);
 
  return aff;
}
 
/* Look for any divs in the aff->ls with a denominator equal to one
 * and plug them into the affine expression and any subsequent divs
 * that may reference the div.
 */
static __isl_give isl_aff *plug_in_integral_divs(__isl_take isl_aff *aff)
{
  int i;
  isl_size n;
  int len;
  isl_int v;
  isl_vec *vec;
  isl_local_space *ls;
  isl_size off;
 
  n = isl_aff_domain_dim(aff, isl_dim_div);
  off = isl_aff_domain_offset(aff, isl_dim_div);
  if (n < 0 || off < 0)
    return isl_aff_free(aff);
  len = aff->v->size;
  for (i = 0; i < n; ++i) {
    if (!isl_int_is_one(aff->ls->div->row[i][0]))
      continue;
    ls = isl_local_space_copy(aff->ls);
    ls = isl_local_space_substitute_seq(ls, isl_dim_div, i,
        aff->ls->div->row[i], len, i + 1, n - (i + 1));
    vec = isl_vec_copy(aff->v);
    vec = isl_vec_cow(vec);
    if (!ls || !vec)
      goto error;
 
    isl_int_init(v);
 
    isl_seq_substitute(vec->el, off + i, aff->ls->div->row[i],
          len, len, v);
 
    isl_int_clear(v);
 
    isl_vec_free(aff->v);
    aff->v = vec;
    isl_local_space_free(aff->ls);
    aff->ls = ls;
  }
 
  return aff;
error:
  isl_vec_free(vec);
  isl_local_space_free(ls);
  return isl_aff_free(aff);
}
 
/* Look for any divs j that appear with a unit coefficient inside
 * the definitions of other divs i and plug them into the definitions
 * of the divs i.
 *
 * In particular, an expression of the form
 *
 *  floor((f(..) + floor(g(..)/n))/m)
 *
 * is simplified to
 *
 *  floor((n * f(..) + g(..))/(n * m))
 *
 * This simplification is correct because we can move the expression
 * f(..) into the inner floor in the original expression to obtain
 *
 *  floor(floor((n * f(..) + g(..))/n)/m)
 *
 * from which we can derive the simplified expression.
 */
static __isl_give isl_aff *plug_in_unit_divs(__isl_take isl_aff *aff)
{
  int i, j;
  isl_size n;
  isl_size off;
 
  n = isl_aff_domain_dim(aff, isl_dim_div);
  off = isl_aff_domain_offset(aff, isl_dim_div);
  if (n < 0 || off < 0)
    return isl_aff_free(aff);
  for (i = 1; i < n; ++i) {
    for (j = 0; j < i; ++j) {
      if (!isl_int_is_one(aff->ls->div->row[i][1 + off + j]))
        continue;
      aff->ls = isl_local_space_substitute_seq(aff->ls,
        isl_dim_div, j, aff->ls->div->row[j],
        aff->v->size, i, 1);
      if (!aff->ls)
        return isl_aff_free(aff);
    }
  }
 
  return aff;
}
 
/* Swap divs "a" and "b" in "aff", which is assumed to be non-NULL.
 *
 * Even though this function is only called on isl_affs with a single
 * reference, we are careful to only change aff->v and aff->ls together.
 */
static __isl_give isl_aff *swap_div(__isl_take isl_aff *aff, int a, int b)
{
  isl_size off = isl_aff_domain_offset(aff, isl_dim_div);
  isl_local_space *ls;
  isl_vec *v;
 
  if (off < 0)
    return isl_aff_free(aff);
 
  ls = isl_local_space_copy(aff->ls);
  ls = isl_local_space_swap_div(ls, a, b);
  v = isl_vec_copy(aff->v);
  v = isl_vec_cow(v);
  if (!ls || !v)
    goto error;
 
  isl_int_swap(v->el[1 + off + a], v->el[1 + off + b]);
  isl_vec_free(aff->v);
  aff->v = v;
  isl_local_space_free(aff->ls);
  aff->ls = ls;
 
  return aff;
error:
  isl_vec_free(v);
  isl_local_space_free(ls);
  return isl_aff_free(aff);
}
 
/* Merge divs "a" and "b" in "aff", which is assumed to be non-NULL.
 *
 * We currently do not actually remove div "b", but simply add its
 * coefficient to that of "a" and then zero it out.
 */
static __isl_give isl_aff *merge_divs(__isl_take isl_aff *aff, int a, int b)
{
  isl_size off = isl_aff_domain_offset(aff, isl_dim_div);
 
  if (off < 0)
    return isl_aff_free(aff);
 
  if (isl_int_is_zero(aff->v->el[1 + off + b]))
    return aff;
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  isl_int_add(aff->v->el[1 + off + a],
        aff->v->el[1 + off + a], aff->v->el[1 + off + b]);
  isl_int_set_si(aff->v->el[1 + off + b], 0);
 
  return aff;
}
 
/* Sort the divs in the local space of "aff" according to
 * the comparison function "cmp_row" in isl_local_space.c,
 * combining the coefficients of identical divs.
 *
 * Reordering divs does not change the semantics of "aff",
 * so there is no need to call isl_aff_cow.
 * Moreover, this function is currently only called on isl_affs
 * with a single reference.
 */
static __isl_give isl_aff *sort_divs(__isl_take isl_aff *aff)
{
  isl_size n;
  int i, j;
 
  n = isl_aff_dim(aff, isl_dim_div);
  if (n < 0)
    return isl_aff_free(aff);
  for (i = 1; i < n; ++i) {
    for (j = i - 1; j >= 0; --j) {
      int cmp = isl_mat_cmp_div(aff->ls->div, j, j + 1);
      if (cmp < 0)
        break;
      if (cmp == 0)
        aff = merge_divs(aff, j, j + 1);
      else
        aff = swap_div(aff, j, j + 1);
      if (!aff)
        return NULL;
    }
  }
 
  return aff;
}
 
/* Normalize the representation of "aff".
 *
 * This function should only be called on "new" isl_affs, i.e.,
 * with only a single reference.  We therefore do not need to
 * worry about affecting other instances.
 */
__isl_give isl_aff *isl_aff_normalize(__isl_take isl_aff *aff)
{
  if (!aff)
    return NULL;
  aff->v = isl_vec_normalize(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
  aff = plug_in_integral_divs(aff);
  aff = plug_in_unit_divs(aff);
  aff = sort_divs(aff);
  aff = isl_aff_remove_unused_divs(aff);
  return aff;
}
 
/* Given f, return floor(f).
 * If f is an integer expression, then just return f.
 * If f is a constant, then return the constant floor(f).
 * Otherwise, if f = g/m, write g = q m + r,
 * create a new div d = [r/m] and return the expression q + d.
 * The coefficients in r are taken to lie between -m/2 and m/2.
 *
 * reduce_div_coefficients performs the same normalization.
 *
 * As a special case, floor(NaN) = NaN.
 */
__isl_give isl_aff *isl_aff_floor(__isl_take isl_aff *aff)
{
  int i;
  int size;
  isl_ctx *ctx;
  isl_vec *div;
 
  if (!aff)
    return NULL;
 
  if (isl_aff_is_nan(aff))
    return aff;
  if (isl_int_is_one(aff->v->el[0]))
    return aff;
 
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  if (isl_aff_is_cst(aff)) {
    isl_int_fdiv_q(aff->v->el[1], aff->v->el[1], aff->v->el[0]);
    isl_int_set_si(aff->v->el[0], 1);
    return aff;
  }
 
  div = isl_vec_copy(aff->v);
  div = isl_vec_cow(div);
  if (!div)
    return isl_aff_free(aff);
 
  ctx = isl_aff_get_ctx(aff);
  isl_int_fdiv_q(aff->v->el[0], aff->v->el[0], ctx->two);
  for (i = 1; i < aff->v->size; ++i) {
    isl_int_fdiv_r(div->el[i], div->el[i], div->el[0]);
    isl_int_fdiv_q(aff->v->el[i], aff->v->el[i], div->el[0]);
    if (isl_int_gt(div->el[i], aff->v->el[0])) {
      isl_int_sub(div->el[i], div->el[i], div->el[0]);
      isl_int_add_ui(aff->v->el[i], aff->v->el[i], 1);
    }
  }
 
  aff->ls = isl_local_space_add_div(aff->ls, div);
  if (!aff->ls)
    return isl_aff_free(aff);
 
  size = aff->v->size;
  aff->v = isl_vec_extend(aff->v, size + 1);
  if (!aff->v)
    return isl_aff_free(aff);
  isl_int_set_si(aff->v->el[0], 1);
  isl_int_set_si(aff->v->el[size], 1);
 
  aff = isl_aff_normalize(aff);
 
  return aff;
}
 
/* Compute
 *
 *  aff mod m = aff - m * floor(aff/m)
 *
 * with m an integer value.
 */
__isl_give isl_aff *isl_aff_mod_val(__isl_take isl_aff *aff,
  __isl_take isl_val *m)
{
  isl_aff *res;
 
  if (!aff || !m)
    goto error;
 
  if (!isl_val_is_int(m))
    isl_die(isl_val_get_ctx(m), isl_error_invalid,
      "expecting integer modulo", goto error);
 
  res = isl_aff_copy(aff);
  aff = isl_aff_scale_down_val(aff, isl_val_copy(m));
  aff = isl_aff_floor(aff);
  aff = isl_aff_scale_val(aff, m);
  res = isl_aff_sub(res, aff);
 
  return res;
error:
  isl_aff_free(aff);
  isl_val_free(m);
  return NULL;
}
 
/* Compute
 *
 *  pwaff mod m = pwaff - m * floor(pwaff/m)
 */
__isl_give isl_pw_aff *isl_pw_aff_mod(__isl_take isl_pw_aff *pwaff, isl_int m)
{
  isl_pw_aff *res;
 
  res = isl_pw_aff_copy(pwaff);
  pwaff = isl_pw_aff_scale_down(pwaff, m);
  pwaff = isl_pw_aff_floor(pwaff);
  pwaff = isl_pw_aff_scale(pwaff, m);
  res = isl_pw_aff_sub(res, pwaff);
 
  return res;
}
 
/* Compute
 *
 *  pa mod m = pa - m * floor(pa/m)
 *
 * with m an integer value.
 */
__isl_give isl_pw_aff *isl_pw_aff_mod_val(__isl_take isl_pw_aff *pa,
  __isl_take isl_val *m)
{
  if (!pa || !m)
    goto error;
  if (!isl_val_is_int(m))
    isl_die(isl_pw_aff_get_ctx(pa), isl_error_invalid,
      "expecting integer modulo", goto error);
  pa = isl_pw_aff_mod(pa, m->n);
  isl_val_free(m);
  return pa;
error:
  isl_pw_aff_free(pa);
  isl_val_free(m);
  return NULL;
}
 
/* Given f, return ceil(f).
 * If f is an integer expression, then just return f.
 * Otherwise, let f be the expression
 *
 *  e/m
 *
 * then return
 *
 *  floor((e + m - 1)/m)
 *
 * As a special case, ceil(NaN) = NaN.
 */
__isl_give isl_aff *isl_aff_ceil(__isl_take isl_aff *aff)
{
  if (!aff)
    return NULL;
 
  if (isl_aff_is_nan(aff))
    return aff;
  if (isl_int_is_one(aff->v->el[0]))
    return aff;
 
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  isl_int_add(aff->v->el[1], aff->v->el[1], aff->v->el[0]);
  isl_int_sub_ui(aff->v->el[1], aff->v->el[1], 1);
  aff = isl_aff_floor(aff);
 
  return aff;
}
 
/* Apply the expansion computed by isl_merge_divs.
 * The expansion itself is given by "exp" while the resulting
 * list of divs is given by "div".
 */
__isl_give isl_aff *isl_aff_expand_divs(__isl_take isl_aff *aff,
  __isl_take isl_mat *div, int *exp)
{
  isl_size old_n_div;
  isl_size new_n_div;
  isl_size offset;
 
  aff = isl_aff_cow(aff);
 
  offset = isl_aff_domain_offset(aff, isl_dim_div);
  old_n_div = isl_aff_domain_dim(aff, isl_dim_div);
  new_n_div = isl_mat_rows(div);
  if (offset < 0 || old_n_div < 0 || new_n_div < 0)
    goto error;
 
  aff->v = isl_vec_expand(aff->v, 1 + offset, old_n_div, exp, new_n_div);
  aff->ls = isl_local_space_replace_divs(aff->ls, div);
  if (!aff->v || !aff->ls)
    return isl_aff_free(aff);
  return aff;
error:
  isl_aff_free(aff);
  isl_mat_free(div);
  return NULL;
}
 
/* Add two affine expressions that live in the same local space.
 */
static __isl_give isl_aff *add_expanded(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  isl_int gcd, f;
 
  aff1 = isl_aff_cow(aff1);
  if (!aff1 || !aff2)
    goto error;
 
  aff1->v = isl_vec_cow(aff1->v);
  if (!aff1->v)
    goto error;
 
  isl_int_init(gcd);
  isl_int_init(f);
  isl_int_gcd(gcd, aff1->v->el[0], aff2->v->el[0]);
  isl_int_divexact(f, aff2->v->el[0], gcd);
  isl_seq_scale(aff1->v->el + 1, aff1->v->el + 1, f, aff1->v->size - 1);
  isl_int_divexact(f, aff1->v->el[0], gcd);
  isl_seq_addmul(aff1->v->el + 1, f, aff2->v->el + 1, aff1->v->size - 1);
  isl_int_divexact(f, aff2->v->el[0], gcd);
  isl_int_mul(aff1->v->el[0], aff1->v->el[0], f);
  isl_int_clear(f);
  isl_int_clear(gcd);
 
  isl_aff_free(aff2);
  aff1 = isl_aff_normalize(aff1);
  return aff1;
error:
  isl_aff_free(aff1);
  isl_aff_free(aff2);
  return NULL;
}
 
/* Replace one of the arguments by a NaN and free the other one.
 */
static __isl_give isl_aff *set_nan_free(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  isl_aff_free(aff2);
  return isl_aff_set_nan(aff1);
}
 
/* Return the sum of "aff1" and "aff2".
 *
 * If either of the two is NaN, then the result is NaN.
 */
__isl_give isl_aff *isl_aff_add(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  isl_ctx *ctx;
  int *exp1 = NULL;
  int *exp2 = NULL;
  isl_mat *div;
  isl_size n_div1, n_div2;
 
  if (!aff1 || !aff2)
    goto error;
 
  ctx = isl_aff_get_ctx(aff1);
  if (!isl_space_is_equal(aff1->ls->dim, aff2->ls->dim))
    isl_die(ctx, isl_error_invalid,
      "spaces don't match", goto error);
 
  if (isl_aff_is_nan(aff1)) {
    isl_aff_free(aff2);
    return aff1;
  }
  if (isl_aff_is_nan(aff2)) {
    isl_aff_free(aff1);
    return aff2;
  }
 
  n_div1 = isl_aff_dim(aff1, isl_dim_div);
  n_div2 = isl_aff_dim(aff2, isl_dim_div);
  if (n_div1 < 0 || n_div2 < 0)
    goto error;
  if (n_div1 == 0 && n_div2 == 0)
    return add_expanded(aff1, aff2);
 
  exp1 = isl_alloc_array(ctx, int, n_div1);
  exp2 = isl_alloc_array(ctx, int, n_div2);
  if ((n_div1 && !exp1) || (n_div2 && !exp2))
    goto error;
 
  div = isl_merge_divs(aff1->ls->div, aff2->ls->div, exp1, exp2);
  aff1 = isl_aff_expand_divs(aff1, isl_mat_copy(div), exp1);
  aff2 = isl_aff_expand_divs(aff2, div, exp2);
  free(exp1);
  free(exp2);
 
  return add_expanded(aff1, aff2);
error:
  free(exp1);
  free(exp2);
  isl_aff_free(aff1);
  isl_aff_free(aff2);
  return NULL;
}
 
__isl_give isl_aff *isl_aff_sub(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  return isl_aff_add(aff1, isl_aff_neg(aff2));
}
 
/* Return the result of scaling "aff" by a factor of "f".
 *
 * As a special case, f * NaN = NaN.
 */
__isl_give isl_aff *isl_aff_scale(__isl_take isl_aff *aff, isl_int f)
{
  isl_int gcd;
 
  if (!aff)
    return NULL;
  if (isl_aff_is_nan(aff))
    return aff;
 
  if (isl_int_is_one(f))
    return aff;
 
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  if (isl_int_is_pos(f) && isl_int_is_divisible_by(aff->v->el[0], f)) {
    isl_int_divexact(aff->v->el[0], aff->v->el[0], f);
    return aff;
  }
 
  isl_int_init(gcd);
  isl_int_gcd(gcd, aff->v->el[0], f);
  isl_int_divexact(aff->v->el[0], aff->v->el[0], gcd);
  isl_int_divexact(gcd, f, gcd);
  isl_seq_scale(aff->v->el + 1, aff->v->el + 1, gcd, aff->v->size - 1);
  isl_int_clear(gcd);
 
  return aff;
}
 
/* Multiple "aff" by "v".
 */
__isl_give isl_aff *isl_aff_scale_val(__isl_take isl_aff *aff,
  __isl_take isl_val *v)
{
  if (!aff || !v)
    goto error;
 
  if (isl_val_is_one(v)) {
    isl_val_free(v);
    return aff;
  }
 
  if (!isl_val_is_rat(v))
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "expecting rational factor", goto error);
 
  aff = isl_aff_scale(aff, v->n);
  aff = isl_aff_scale_down(aff, v->d);
 
  isl_val_free(v);
  return aff;
error:
  isl_aff_free(aff);
  isl_val_free(v);
  return NULL;
}
 
/* Return the result of scaling "aff" down by a factor of "f".
 *
 * As a special case, NaN/f = NaN.
 */
__isl_give isl_aff *isl_aff_scale_down(__isl_take isl_aff *aff, isl_int f)
{
  isl_int gcd;
 
  if (!aff)
    return NULL;
  if (isl_aff_is_nan(aff))
    return aff;
 
  if (isl_int_is_one(f))
    return aff;
 
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
 
  if (isl_int_is_zero(f))
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "cannot scale down by zero", return isl_aff_free(aff));
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  isl_int_init(gcd);
  isl_seq_gcd(aff->v->el + 1, aff->v->size - 1, &gcd);
  isl_int_gcd(gcd, gcd, f);
  isl_seq_scale_down(aff->v->el + 1, aff->v->el + 1, gcd, aff->v->size - 1);
  isl_int_divexact(gcd, f, gcd);
  isl_int_mul(aff->v->el[0], aff->v->el[0], gcd);
  isl_int_clear(gcd);
 
  return aff;
}
 
/* Divide "aff" by "v".
 */
__isl_give isl_aff *isl_aff_scale_down_val(__isl_take isl_aff *aff,
  __isl_take isl_val *v)
{
  if (!aff || !v)
    goto error;
 
  if (isl_val_is_one(v)) {
    isl_val_free(v);
    return aff;
  }
 
  if (!isl_val_is_rat(v))
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "expecting rational factor", goto error);
  if (!isl_val_is_pos(v))
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "factor needs to be positive", goto error);
 
  aff = isl_aff_scale(aff, v->d);
  aff = isl_aff_scale_down(aff, v->n);
 
  isl_val_free(v);
  return aff;
error:
  isl_aff_free(aff);
  isl_val_free(v);
  return NULL;
}
 
__isl_give isl_aff *isl_aff_scale_down_ui(__isl_take isl_aff *aff, unsigned f)
{
  isl_int v;
 
  if (f == 1)
    return aff;
 
  isl_int_init(v);
  isl_int_set_ui(v, f);
  aff = isl_aff_scale_down(aff, v);
  isl_int_clear(v);
 
  return aff;
}
 
__isl_give isl_aff *isl_aff_set_dim_name(__isl_take isl_aff *aff,
  enum isl_dim_type type, unsigned pos, const char *s)
{
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
  if (type == isl_dim_out)
    isl_die(aff->v->ctx, isl_error_invalid,
      "cannot set name of output/set dimension",
      return isl_aff_free(aff));
  if (type == isl_dim_in)
    type = isl_dim_set;
  aff->ls = isl_local_space_set_dim_name(aff->ls, type, pos, s);
  if (!aff->ls)
    return isl_aff_free(aff);
 
  return aff;
}
 
__isl_give isl_aff *isl_aff_set_dim_id(__isl_take isl_aff *aff,
  enum isl_dim_type type, unsigned pos, __isl_take isl_id *id)
{
  aff = isl_aff_cow(aff);
  if (!aff)
    goto error;
  if (type == isl_dim_out)
    isl_die(aff->v->ctx, isl_error_invalid,
      "cannot set name of output/set dimension",
      goto error);
  if (type == isl_dim_in)
    type = isl_dim_set;
  aff->ls = isl_local_space_set_dim_id(aff->ls, type, pos, id);
  if (!aff->ls)
    return isl_aff_free(aff);
 
  return aff;
error:
  isl_id_free(id);
  isl_aff_free(aff);
  return NULL;
}
 
/* Replace the identifier of the input tuple of "aff" by "id".
 * type is currently required to be equal to isl_dim_in
 */
__isl_give isl_aff *isl_aff_set_tuple_id(__isl_take isl_aff *aff,
  enum isl_dim_type type, __isl_take isl_id *id)
{
  aff = isl_aff_cow(aff);
  if (!aff)
    goto error;
  if (type != isl_dim_in)
    isl_die(aff->v->ctx, isl_error_invalid,
      "cannot only set id of input tuple", goto error);
  aff->ls = isl_local_space_set_tuple_id(aff->ls, isl_dim_set, id);
  if (!aff->ls)
    return isl_aff_free(aff);
 
  return aff;
error:
  isl_id_free(id);
  isl_aff_free(aff);
  return NULL;
}
 
/* Exploit the equalities in "eq" to simplify the affine expression
 * and the expressions of the integer divisions in the local space.
 * The integer divisions in this local space are assumed to appear
 * as regular dimensions in "eq".
 */
static __isl_give isl_aff *isl_aff_substitute_equalities_lifted(
  __isl_take isl_aff *aff, __isl_take isl_basic_set *eq)
{
  int i, j;
  unsigned o_div;
  unsigned n_div;
 
  if (!eq)
    goto error;
  if (eq->n_eq == 0) {
    isl_basic_set_free(eq);
    return aff;
  }
 
  aff = isl_aff_cow(aff);
  if (!aff)
    goto error;
 
  aff->ls = isl_local_space_substitute_equalities(aff->ls,
              isl_basic_set_copy(eq));
  aff->v = isl_vec_cow(aff->v);
  if (!aff->ls || !aff->v)
    goto error;
 
  o_div = isl_basic_set_offset(eq, isl_dim_div);
  n_div = eq->n_div;
  for (i = 0; i < eq->n_eq; ++i) {
    j = isl_seq_last_non_zero(eq->eq[i], o_div + n_div);
    if (j < 0 || j == 0 || j >= o_div)
      continue;
 
    isl_seq_elim(aff->v->el + 1, eq->eq[i], j, o_div,
        &aff->v->el[0]);
  }
 
  isl_basic_set_free(eq);
  aff = isl_aff_normalize(aff);
  return aff;
error:
  isl_basic_set_free(eq);
  isl_aff_free(aff);
  return NULL;
}
 
/* Exploit the equalities in "eq" to simplify the affine expression
 * and the expressions of the integer divisions in the local space.
 */
__isl_give isl_aff *isl_aff_substitute_equalities(__isl_take isl_aff *aff,
  __isl_take isl_basic_set *eq)
{
  isl_size n_div;
 
  n_div = isl_aff_domain_dim(aff, isl_dim_div);
  if (n_div < 0)
    goto error;
  if (n_div > 0)
    eq = isl_basic_set_add_dims(eq, isl_dim_set, n_div);
  return isl_aff_substitute_equalities_lifted(aff, eq);
error:
  isl_basic_set_free(eq);
  isl_aff_free(aff);
  return NULL;
}
 
/* Look for equalities among the variables shared by context and aff
 * and the integer divisions of aff, if any.
 * The equalities are then used to eliminate coefficients and/or integer
 * divisions from aff.
 */
__isl_give isl_aff *isl_aff_gist(__isl_take isl_aff *aff,
  __isl_take isl_set *context)
{
  isl_local_space *ls;
  isl_basic_set *hull;
 
  ls = isl_aff_get_domain_local_space(aff);
  context = isl_local_space_lift_set(ls, context);
 
  hull = isl_set_affine_hull(context);
  return isl_aff_substitute_equalities_lifted(aff, hull);
}
 
__isl_give isl_aff *isl_aff_gist_params(__isl_take isl_aff *aff,
  __isl_take isl_set *context)
{
  isl_set *dom_context = isl_set_universe(isl_aff_get_domain_space(aff));
  dom_context = isl_set_intersect_params(dom_context, context);
  return isl_aff_gist(aff, dom_context);
}
 
/* Return a basic set containing those elements in the space
 * of aff where it is positive.  "rational" should not be set.
 *
 * If "aff" is NaN, then it is not positive.
 */
static __isl_give isl_basic_set *aff_pos_basic_set(__isl_take isl_aff *aff,
  int rational, void *user)
{
  isl_constraint *ineq;
  isl_basic_set *bset;
  isl_val *c;
 
  if (!aff)
    return NULL;
  if (isl_aff_is_nan(aff)) {
    isl_space *space = isl_aff_get_domain_space(aff);
    isl_aff_free(aff);
    return isl_basic_set_empty(space);
  }
  if (rational)
    isl_die(isl_aff_get_ctx(aff), isl_error_unsupported,
      "rational sets not supported", goto error);
 
  ineq = isl_inequality_from_aff(aff);
  c = isl_constraint_get_constant_val(ineq);
  c = isl_val_sub_ui(c, 1);
  ineq = isl_constraint_set_constant_val(ineq, c);
 
  bset = isl_basic_set_from_constraint(ineq);
  bset = isl_basic_set_simplify(bset);
  return bset;
error:
  isl_aff_free(aff);
  return NULL;
}
 
/* Return a basic set containing those elements in the space
 * of aff where it is non-negative.
 * If "rational" is set, then return a rational basic set.
 *
 * If "aff" is NaN, then it is not non-negative (it's not negative either).
 */
static __isl_give isl_basic_set *aff_nonneg_basic_set(
  __isl_take isl_aff *aff, int rational, void *user)
{
  isl_constraint *ineq;
  isl_basic_set *bset;
 
  if (!aff)
    return NULL;
  if (isl_aff_is_nan(aff)) {
    isl_space *space = isl_aff_get_domain_space(aff);
    isl_aff_free(aff);
    return isl_basic_set_empty(space);
  }
 
  ineq = isl_inequality_from_aff(aff);
 
  bset = isl_basic_set_from_constraint(ineq);
  if (rational)
    bset = isl_basic_set_set_rational(bset);
  bset = isl_basic_set_simplify(bset);
  return bset;
}
 
/* Return a basic set containing those elements in the space
 * of aff where it is non-negative.
 */
__isl_give isl_basic_set *isl_aff_nonneg_basic_set(__isl_take isl_aff *aff)
{
  return aff_nonneg_basic_set(aff, 0, NULL);
}
 
/* Return a basic set containing those elements in the domain space
 * of "aff" where it is positive.
 */
__isl_give isl_basic_set *isl_aff_pos_basic_set(__isl_take isl_aff *aff)
{
  aff = isl_aff_add_constant_num_si(aff, -1);
  return isl_aff_nonneg_basic_set(aff);
}
 
/* Return a basic set containing those elements in the domain space
 * of aff where it is negative.
 */
__isl_give isl_basic_set *isl_aff_neg_basic_set(__isl_take isl_aff *aff)
{
  aff = isl_aff_neg(aff);
  return isl_aff_pos_basic_set(aff);
}
 
/* Return a basic set containing those elements in the space
 * of aff where it is zero.
 * If "rational" is set, then return a rational basic set.
 *
 * If "aff" is NaN, then it is not zero.
 */
static __isl_give isl_basic_set *aff_zero_basic_set(__isl_take isl_aff *aff,
  int rational, void *user)
{
  isl_constraint *ineq;
  isl_basic_set *bset;
 
  if (!aff)
    return NULL;
  if (isl_aff_is_nan(aff)) {
    isl_space *space = isl_aff_get_domain_space(aff);
    isl_aff_free(aff);
    return isl_basic_set_empty(space);
  }
 
  ineq = isl_equality_from_aff(aff);
 
  bset = isl_basic_set_from_constraint(ineq);
  if (rational)
    bset = isl_basic_set_set_rational(bset);
  bset = isl_basic_set_simplify(bset);
  return bset;
}
 
/* Return a basic set containing those elements in the space
 * of aff where it is zero.
 */
__isl_give isl_basic_set *isl_aff_zero_basic_set(__isl_take isl_aff *aff)
{
  return aff_zero_basic_set(aff, 0, NULL);
}
 
/* Return a basic set containing those elements in the shared space
 * of aff1 and aff2 where aff1 is greater than or equal to aff2.
 */
__isl_give isl_basic_set *isl_aff_ge_basic_set(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  aff1 = isl_aff_sub(aff1, aff2);
 
  return isl_aff_nonneg_basic_set(aff1);
}
 
/* Return a basic set containing those elements in the shared domain space
 * of "aff1" and "aff2" where "aff1" is greater than "aff2".
 */
__isl_give isl_basic_set *isl_aff_gt_basic_set(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  aff1 = isl_aff_sub(aff1, aff2);
 
  return isl_aff_pos_basic_set(aff1);
}
 
/* Return a set containing those elements in the shared space
 * of aff1 and aff2 where aff1 is greater than or equal to aff2.
 */
__isl_give isl_set *isl_aff_ge_set(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  return isl_set_from_basic_set(isl_aff_ge_basic_set(aff1, aff2));
}
 
/* Return a set containing those elements in the shared domain space
 * of aff1 and aff2 where aff1 is greater than aff2.
 *
 * If either of the two inputs is NaN, then the result is empty,
 * as comparisons with NaN always return false.
 */
__isl_give isl_set *isl_aff_gt_set(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  return isl_set_from_basic_set(isl_aff_gt_basic_set(aff1, aff2));
}
 
/* Return a basic set containing those elements in the shared space
 * of aff1 and aff2 where aff1 is smaller than or equal to aff2.
 */
__isl_give isl_basic_set *isl_aff_le_basic_set(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  return isl_aff_ge_basic_set(aff2, aff1);
}
 
/* Return a basic set containing those elements in the shared domain space
 * of "aff1" and "aff2" where "aff1" is smaller than "aff2".
 */
__isl_give isl_basic_set *isl_aff_lt_basic_set(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  return isl_aff_gt_basic_set(aff2, aff1);
}
 
/* Return a set containing those elements in the shared space
 * of aff1 and aff2 where aff1 is smaller than or equal to aff2.
 */
__isl_give isl_set *isl_aff_le_set(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  return isl_aff_ge_set(aff2, aff1);
}
 
/* Return a set containing those elements in the shared domain space
 * of "aff1" and "aff2" where "aff1" is smaller than "aff2".
 */
__isl_give isl_set *isl_aff_lt_set(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  return isl_set_from_basic_set(isl_aff_lt_basic_set(aff1, aff2));
}
 
/* Return a basic set containing those elements in the shared space
 * of aff1 and aff2 where aff1 and aff2 are equal.
 */
__isl_give isl_basic_set *isl_aff_eq_basic_set(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  aff1 = isl_aff_sub(aff1, aff2);
 
  return isl_aff_zero_basic_set(aff1);
}
 
/* Return a set containing those elements in the shared space
 * of aff1 and aff2 where aff1 and aff2 are equal.
 */
__isl_give isl_set *isl_aff_eq_set(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  return isl_set_from_basic_set(isl_aff_eq_basic_set(aff1, aff2));
}
 
/* Return a set containing those elements in the shared domain space
 * of aff1 and aff2 where aff1 and aff2 are not equal.
 *
 * If either of the two inputs is NaN, then the result is empty,
 * as comparisons with NaN always return false.
 */
__isl_give isl_set *isl_aff_ne_set(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  isl_set *set_lt, *set_gt;
 
  set_lt = isl_aff_lt_set(isl_aff_copy(aff1),
        isl_aff_copy(aff2));
  set_gt = isl_aff_gt_set(aff1, aff2);
  return isl_set_union_disjoint(set_lt, set_gt);
}
 
__isl_give isl_aff *isl_aff_add_on_domain(__isl_keep isl_set *dom,
  __isl_take isl_aff *aff1, __isl_take isl_aff *aff2)
{
  aff1 = isl_aff_add(aff1, aff2);
  aff1 = isl_aff_gist(aff1, isl_set_copy(dom));
  return aff1;
}
 
isl_bool isl_aff_is_empty(__isl_keep isl_aff *aff)
{
  if (!aff)
    return isl_bool_error;
 
  return isl_bool_false;
}
 
#undef TYPE
#define TYPE  isl_aff
static
#include "check_type_range_templ.c"
 
/* Check whether the given affine expression has non-zero coefficient
 * for any dimension in the given range or if any of these dimensions
 * appear with non-zero coefficients in any of the integer divisions
 * involved in the affine expression.
 */
isl_bool isl_aff_involves_dims(__isl_keep isl_aff *aff,
  enum isl_dim_type type, unsigned first, unsigned n)
{
  int i;
  int *active = NULL;
  isl_bool involves = isl_bool_false;
 
  if (!aff)
    return isl_bool_error;
  if (n == 0)
    return isl_bool_false;
  if (isl_aff_check_range(aff, type, first, n) < 0)
    return isl_bool_error;
 
  active = isl_local_space_get_active(aff->ls, aff->v->el + 2);
  if (!active)
    goto error;
 
  first += isl_local_space_offset(aff->ls, type) - 1;
  for (i = 0; i < n; ++i)
    if (active[first + i]) {
      involves = isl_bool_true;
      break;
    }
 
  free(active);
 
  return involves;
error:
  free(active);
  return isl_bool_error;
}
 
/* Does "aff" involve any local variables, i.e., integer divisions?
 */
isl_bool isl_aff_involves_locals(__isl_keep isl_aff *aff)
{
  isl_size n;
 
  n = isl_aff_dim(aff, isl_dim_div);
  if (n < 0)
    return isl_bool_error;
  return isl_bool_ok(n > 0);
}
 
__isl_give isl_aff *isl_aff_drop_dims(__isl_take isl_aff *aff,
  enum isl_dim_type type, unsigned first, unsigned n)
{
  if (!aff)
    return NULL;
  if (type == isl_dim_out)
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "cannot drop output/set dimension",
      return isl_aff_free(aff));
  if (type == isl_dim_in)
    type = isl_dim_set;
  if (n == 0 && !isl_local_space_is_named_or_nested(aff->ls, type))
    return aff;
 
  if (isl_local_space_check_range(aff->ls, type, first, n) < 0)
    return isl_aff_free(aff);
 
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
 
  aff->ls = isl_local_space_drop_dims(aff->ls, type, first, n);
  if (!aff->ls)
    return isl_aff_free(aff);
 
  first += 1 + isl_local_space_offset(aff->ls, type);
  aff->v = isl_vec_drop_els(aff->v, first, n);
  if (!aff->v)
    return isl_aff_free(aff);
 
  return aff;
}
 
/* Is the domain of "aff" a product?
 */
static isl_bool isl_aff_domain_is_product(__isl_keep isl_aff *aff)
{
  return isl_space_is_product(isl_aff_peek_domain_space(aff));
}
 
#undef TYPE
#define TYPE  isl_aff
#include <isl_domain_factor_templ.c>
 
/* Project the domain of the affine expression onto its parameter space.
 * The affine expression may not involve any of the domain dimensions.
 */
__isl_give isl_aff *isl_aff_project_domain_on_params(__isl_take isl_aff *aff)
{
  isl_space *space;
  isl_size n;
 
  n = isl_aff_dim(aff, isl_dim_in);
  if (n < 0)
    return isl_aff_free(aff);
  aff = isl_aff_drop_domain(aff, 0, n);
  space = isl_aff_get_domain_space(aff);
  space = isl_space_params(space);
  aff = isl_aff_reset_domain_space(aff, space);
  return aff;
}
 
/* Convert an affine expression defined over a parameter domain
 * into one that is defined over a zero-dimensional set.
 */
__isl_give isl_aff *isl_aff_from_range(__isl_take isl_aff *aff)
{
  isl_local_space *ls;
 
  ls = isl_aff_take_domain_local_space(aff);
  ls = isl_local_space_set_from_params(ls);
  aff = isl_aff_restore_domain_local_space(aff, ls);
 
  return aff;
}
 
__isl_give isl_aff *isl_aff_insert_dims(__isl_take isl_aff *aff,
  enum isl_dim_type type, unsigned first, unsigned n)
{
  if (!aff)
    return NULL;
  if (type == isl_dim_out)
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "cannot insert output/set dimensions",
      return isl_aff_free(aff));
  if (type == isl_dim_in)
    type = isl_dim_set;
  if (n == 0 && !isl_local_space_is_named_or_nested(aff->ls, type))
    return aff;
 
  if (isl_local_space_check_range(aff->ls, type, first, 0) < 0)
    return isl_aff_free(aff);
 
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
 
  aff->ls = isl_local_space_insert_dims(aff->ls, type, first, n);
  if (!aff->ls)
    return isl_aff_free(aff);
 
  first += 1 + isl_local_space_offset(aff->ls, type);
  aff->v = isl_vec_insert_zero_els(aff->v, first, n);
  if (!aff->v)
    return isl_aff_free(aff);
 
  return aff;
}
 
__isl_give isl_aff *isl_aff_add_dims(__isl_take isl_aff *aff,
  enum isl_dim_type type, unsigned n)
{
  isl_size pos;
 
  pos = isl_aff_dim(aff, type);
  if (pos < 0)
    return isl_aff_free(aff);
 
  return isl_aff_insert_dims(aff, type, pos, n);
}
 
/* Move the "n" dimensions of "src_type" starting at "src_pos" of "aff"
 * to dimensions of "dst_type" at "dst_pos".
 *
 * We only support moving input dimensions to parameters and vice versa.
 */
__isl_give isl_aff *isl_aff_move_dims(__isl_take isl_aff *aff,
  enum isl_dim_type dst_type, unsigned dst_pos,
  enum isl_dim_type src_type, unsigned src_pos, unsigned n)
{
  unsigned g_dst_pos;
  unsigned g_src_pos;
  isl_size src_off, dst_off;
 
  if (!aff)
    return NULL;
  if (n == 0 &&
      !isl_local_space_is_named_or_nested(aff->ls, src_type) &&
      !isl_local_space_is_named_or_nested(aff->ls, dst_type))
    return aff;
 
  if (dst_type == isl_dim_out || src_type == isl_dim_out)
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "cannot move output/set dimension",
      return isl_aff_free(aff));
  if (dst_type == isl_dim_div || src_type == isl_dim_div)
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "cannot move divs", return isl_aff_free(aff));
  if (dst_type == isl_dim_in)
    dst_type = isl_dim_set;
  if (src_type == isl_dim_in)
    src_type = isl_dim_set;
 
  if (isl_local_space_check_range(aff->ls, src_type, src_pos, n) < 0)
    return isl_aff_free(aff);
  if (dst_type == src_type)
    isl_die(isl_aff_get_ctx(aff), isl_error_unsupported,
      "moving dims within the same type not supported",
      return isl_aff_free(aff));
 
  aff = isl_aff_cow(aff);
  src_off = isl_aff_domain_offset(aff, src_type);
  dst_off = isl_aff_domain_offset(aff, dst_type);
  if (src_off < 0 || dst_off < 0)
    return isl_aff_free(aff);
 
  g_src_pos = 1 + src_off + src_pos;
  g_dst_pos = 1 + dst_off + dst_pos;
  if (dst_type > src_type)
    g_dst_pos -= n;
 
  aff->v = isl_vec_move_els(aff->v, g_dst_pos, g_src_pos, n);
  aff->ls = isl_local_space_move_dims(aff->ls, dst_type, dst_pos,
            src_type, src_pos, n);
  if (!aff->v || !aff->ls)
    return isl_aff_free(aff);
 
  aff = sort_divs(aff);
 
  return aff;
}
 
/* Given an affine function on a domain (A -> B),
 * interchange A and B in the wrapped domain
 * to obtain a function on the domain (B -> A).
 *
 * Since this may change the position of some variables,
 * it may also change the normalized order of the local variables.
 * Restore this order.  Since sort_divs assumes the input
 * has a single reference, an explicit isl_aff_cow is required.
 */
__isl_give isl_aff *isl_aff_domain_reverse(__isl_take isl_aff *aff)
{
  isl_space *space;
  isl_local_space *ls;
  isl_vec *v;
  isl_size n_in, n_out;
  unsigned offset;
 
  space = isl_aff_peek_domain_space(aff);
  offset = isl_space_offset(space, isl_dim_set);
  n_in = isl_space_wrapped_dim(space, isl_dim_set, isl_dim_in);
  n_out = isl_space_wrapped_dim(space, isl_dim_set, isl_dim_out);
  if (offset < 0 || n_in < 0 || n_out < 0)
    return isl_aff_free(aff);
 
  v = isl_aff_take_rat_aff(aff);
  v = isl_vec_move_els(v, 1 + 1 + offset, 1 + 1 + offset + n_in, n_out);
  aff = isl_aff_restore_rat_aff(aff, v);
 
  ls = isl_aff_take_domain_local_space(aff);
  ls = isl_local_space_wrapped_reverse(ls);
  aff = isl_aff_restore_domain_local_space(aff, ls);
 
  aff = isl_aff_cow(aff);
  aff = sort_divs(aff);
 
  return aff;
}
 
/* Return a zero isl_aff in the given space.
 *
 * This is a helper function for isl_pw_*_as_* that ensures a uniform
 * interface over all piecewise types.
 */
static __isl_give isl_aff *isl_aff_zero_in_space(__isl_take isl_space *space)
{
  isl_local_space *ls;
 
  ls = isl_local_space_from_space(isl_space_domain(space));
  return isl_aff_zero_on_domain(ls);
}
 
#define isl_aff_involves_nan isl_aff_is_nan
 
#undef PW
#define PW isl_pw_aff
#undef BASE
#define BASE aff
#undef EL_IS_ZERO
#define EL_IS_ZERO is_empty
#undef ZERO
#define ZERO empty
#undef IS_ZERO
#define IS_ZERO is_empty
#undef FIELD
#define FIELD aff
#undef DEFAULT_IS_ZERO
#define DEFAULT_IS_ZERO 0
 
#include <isl_pw_templ.c>
#include <isl_pw_un_op_templ.c>
#include <isl_pw_add_constant_val_templ.c>
#include <isl_pw_add_disjoint_templ.c>
#include <isl_pw_bind_domain_templ.c>
#include <isl_pw_domain_reverse_templ.c>
#include <isl_pw_eval.c>
#include <isl_pw_hash.c>
#include <isl_pw_fix_templ.c>
#include <isl_pw_from_range_templ.c>
#include <isl_pw_insert_dims_templ.c>
#include <isl_pw_insert_domain_templ.c>
#include <isl_pw_move_dims_templ.c>
#include <isl_pw_neg_templ.c>
#include <isl_pw_pullback_templ.c>
#include <isl_pw_scale_templ.c>
#include <isl_pw_sub_templ.c>
#include <isl_pw_union_opt.c>
 
#undef BASE
#define BASE pw_aff
 
#include <isl_union_single.c>
#include <isl_union_neg.c>
#include <isl_union_sub_templ.c>
 
#undef BASE
#define BASE aff
 
#include <isl_union_pw_templ.c>
 
/* Compute a piecewise quasi-affine expression with a domain that
 * is the union of those of pwaff1 and pwaff2 and such that on each
 * cell, the quasi-affine expression is the maximum of those of pwaff1
 * and pwaff2.  If only one of pwaff1 or pwaff2 is defined on a given
 * cell, then the associated expression is the defined one.
 */
__isl_give isl_pw_aff *isl_pw_aff_union_max(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  isl_pw_aff_align_params_bin(&pwaff1, &pwaff2);
  return isl_pw_aff_union_opt_cmp(pwaff1, pwaff2, &isl_aff_ge_set);
}
 
/* Compute a piecewise quasi-affine expression with a domain that
 * is the union of those of pwaff1 and pwaff2 and such that on each
 * cell, the quasi-affine expression is the minimum of those of pwaff1
 * and pwaff2.  If only one of pwaff1 or pwaff2 is defined on a given
 * cell, then the associated expression is the defined one.
 */
__isl_give isl_pw_aff *isl_pw_aff_union_min(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  isl_pw_aff_align_params_bin(&pwaff1, &pwaff2);
  return isl_pw_aff_union_opt_cmp(pwaff1, pwaff2, &isl_aff_le_set);
}
 
__isl_give isl_pw_aff *isl_pw_aff_union_opt(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2, int max)
{
  if (max)
    return isl_pw_aff_union_max(pwaff1, pwaff2);
  else
    return isl_pw_aff_union_min(pwaff1, pwaff2);
}
 
/* Is the domain of "pa" a product?
 */
static isl_bool isl_pw_aff_domain_is_product(__isl_keep isl_pw_aff *pa)
{
  return isl_space_domain_is_wrapping(isl_pw_aff_peek_space(pa));
}
 
#undef TYPE
#define TYPE  isl_pw_aff
#include <isl_domain_factor_templ.c>
 
/* Return a set containing those elements in the domain
 * of "pwaff" where it satisfies "fn" (if complement is 0) or
 * does not satisfy "fn" (if complement is 1).
 *
 * The pieces with a NaN never belong to the result since
 * NaN does not satisfy any property.
 */
static __isl_give isl_set *pw_aff_locus(__isl_take isl_pw_aff *pwaff,
  __isl_give isl_basic_set *(*fn)(__isl_take isl_aff *aff, int rational,
    void *user),
  int complement, void *user)
{
  int i;
  isl_set *set;
 
  if (!pwaff)
    return NULL;
 
  set = isl_set_empty(isl_pw_aff_get_domain_space(pwaff));
 
  for (i = 0; i < pwaff->n; ++i) {
    isl_basic_set *bset;
    isl_set *set_i, *locus;
    isl_bool rational;
 
    if (isl_aff_is_nan(pwaff->p[i].aff))
      continue;
 
    rational = isl_set_has_rational(pwaff->p[i].set);
    bset = fn(isl_aff_copy(pwaff->p[i].aff), rational, user);
    locus = isl_set_from_basic_set(bset);
    set_i = isl_set_copy(pwaff->p[i].set);
    if (complement)
      set_i = isl_set_subtract(set_i, locus);
    else
      set_i = isl_set_intersect(set_i, locus);
    set = isl_set_union_disjoint(set, set_i);
  }
 
  isl_pw_aff_free(pwaff);
 
  return set;
}
 
/* Return a set containing those elements in the domain
 * of "pa" where it is positive.
 */
__isl_give isl_set *isl_pw_aff_pos_set(__isl_take isl_pw_aff *pa)
{
  return pw_aff_locus(pa, &aff_pos_basic_set, 0, NULL);
}
 
/* Return a set containing those elements in the domain
 * of pwaff where it is non-negative.
 */
__isl_give isl_set *isl_pw_aff_nonneg_set(__isl_take isl_pw_aff *pwaff)
{
  return pw_aff_locus(pwaff, &aff_nonneg_basic_set, 0, NULL);
}
 
/* Return a set containing those elements in the domain
 * of pwaff where it is zero.
 */
__isl_give isl_set *isl_pw_aff_zero_set(__isl_take isl_pw_aff *pwaff)
{
  return pw_aff_locus(pwaff, &aff_zero_basic_set, 0, NULL);
}
 
/* Return a set containing those elements in the domain
 * of pwaff where it is not zero.
 */
__isl_give isl_set *isl_pw_aff_non_zero_set(__isl_take isl_pw_aff *pwaff)
{
  return pw_aff_locus(pwaff, &aff_zero_basic_set, 1, NULL);
}
 
/* Bind the affine function "aff" to the parameter "id",
 * returning the elements in the domain where the affine expression
 * is equal to the parameter.
 */
__isl_give isl_basic_set *isl_aff_bind_id(__isl_take isl_aff *aff,
  __isl_take isl_id *id)
{
  isl_space *space;
  isl_aff *aff_id;
 
  space = isl_aff_get_domain_space(aff);
  space = isl_space_add_param_id(space, isl_id_copy(id));
 
  aff = isl_aff_align_params(aff, isl_space_copy(space));
  aff_id = isl_aff_param_on_domain_space_id(space, id);
 
  return isl_aff_eq_basic_set(aff, aff_id);
}
 
/* Wrapper around isl_aff_bind_id for use as pw_aff_locus callback.
 * "rational" should not be set.
 */
static __isl_give isl_basic_set *aff_bind_id(__isl_take isl_aff *aff,
  int rational, void *user)
{
  isl_id *id = user;
 
  if (!aff)
    return NULL;
  if (rational)
    isl_die(isl_aff_get_ctx(aff), isl_error_unsupported,
      "rational binding not supported", goto error);
  return isl_aff_bind_id(aff, isl_id_copy(id));
error:
  isl_aff_free(aff);
  return NULL;
}
 
/* Bind the piecewise affine function "pa" to the parameter "id",
 * returning the elements in the domain where the expression
 * is equal to the parameter.
 */
__isl_give isl_set *isl_pw_aff_bind_id(__isl_take isl_pw_aff *pa,
  __isl_take isl_id *id)
{
  isl_set *bound;
 
  bound = pw_aff_locus(pa, &aff_bind_id, 0, id);
  isl_id_free(id);
 
  return bound;
}
 
/* Return a set containing those elements in the shared domain
 * of pwaff1 and pwaff2 where pwaff1 is greater than (or equal) to pwaff2.
 *
 * We compute the difference on the shared domain and then construct
 * the set of values where this difference is non-negative.
 * If strict is set, we first subtract 1 from the difference.
 * If equal is set, we only return the elements where pwaff1 and pwaff2
 * are equal.
 */
static __isl_give isl_set *pw_aff_gte_set(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2, int strict, int equal)
{
  isl_set *set1, *set2;
 
  set1 = isl_pw_aff_domain(isl_pw_aff_copy(pwaff1));
  set2 = isl_pw_aff_domain(isl_pw_aff_copy(pwaff2));
  set1 = isl_set_intersect(set1, set2);
  pwaff1 = isl_pw_aff_intersect_domain(pwaff1, isl_set_copy(set1));
  pwaff2 = isl_pw_aff_intersect_domain(pwaff2, isl_set_copy(set1));
  pwaff1 = isl_pw_aff_add(pwaff1, isl_pw_aff_neg(pwaff2));
 
  if (strict) {
    isl_space *space = isl_set_get_space(set1);
    isl_aff *aff;
    aff = isl_aff_zero_on_domain(isl_local_space_from_space(space));
    aff = isl_aff_add_constant_si(aff, -1);
    pwaff1 = isl_pw_aff_add(pwaff1, isl_pw_aff_alloc(set1, aff));
  } else
    isl_set_free(set1);
 
  if (equal)
    return isl_pw_aff_zero_set(pwaff1);
  return isl_pw_aff_nonneg_set(pwaff1);
}
 
/* Return a set containing those elements in the shared domain
 * of pwaff1 and pwaff2 where pwaff1 is equal to pwaff2.
 */
__isl_give isl_set *isl_pw_aff_eq_set(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  isl_pw_aff_align_params_bin(&pwaff1, &pwaff2);
  return pw_aff_gte_set(pwaff1, pwaff2, 0, 1);
}
 
/* Return a set containing those elements in the shared domain
 * of pwaff1 and pwaff2 where pwaff1 is greater than or equal to pwaff2.
 */
__isl_give isl_set *isl_pw_aff_ge_set(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  isl_pw_aff_align_params_bin(&pwaff1, &pwaff2);
  return pw_aff_gte_set(pwaff1, pwaff2, 0, 0);
}
 
/* Return a set containing those elements in the shared domain
 * of pwaff1 and pwaff2 where pwaff1 is strictly greater than pwaff2.
 */
__isl_give isl_set *isl_pw_aff_gt_set(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  isl_pw_aff_align_params_bin(&pwaff1, &pwaff2);
  return pw_aff_gte_set(pwaff1, pwaff2, 1, 0);
}
 
__isl_give isl_set *isl_pw_aff_le_set(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  return isl_pw_aff_ge_set(pwaff2, pwaff1);
}
 
__isl_give isl_set *isl_pw_aff_lt_set(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  return isl_pw_aff_gt_set(pwaff2, pwaff1);
}
 
/* Return a map containing pairs of elements in the domains of "pa1" and "pa2"
 * where the function values are ordered in the same way as "order",
 * which returns a set in the shared domain of its two arguments.
 *
 * Let "pa1" and "pa2" be defined on domains A and B respectively.
 * We first pull back the two functions such that they are defined on
 * the domain [A -> B].  Then we apply "order", resulting in a set
 * in the space [A -> B].  Finally, we unwrap this set to obtain
 * a map in the space A -> B.
 */
static __isl_give isl_map *isl_pw_aff_order_map(
  __isl_take isl_pw_aff *pa1, __isl_take isl_pw_aff *pa2,
  __isl_give isl_set *(*order)(__isl_take isl_pw_aff *pa1,
    __isl_take isl_pw_aff *pa2))
{
  isl_space *space1, *space2;
  isl_multi_aff *ma;
  isl_set *set;
 
  isl_pw_aff_align_params_bin(&pa1, &pa2);
  space1 = isl_space_domain(isl_pw_aff_get_space(pa1));
  space2 = isl_space_domain(isl_pw_aff_get_space(pa2));
  space1 = isl_space_map_from_domain_and_range(space1, space2);
  ma = isl_multi_aff_domain_map(isl_space_copy(space1));
  pa1 = isl_pw_aff_pullback_multi_aff(pa1, ma);
  ma = isl_multi_aff_range_map(space1);
  pa2 = isl_pw_aff_pullback_multi_aff(pa2, ma);
  set = order(pa1, pa2);
 
  return isl_set_unwrap(set);
}
 
/* Return a map containing pairs of elements in the domains of "pa1" and "pa2"
 * where the function values are equal.
 */
__isl_give isl_map *isl_pw_aff_eq_map(__isl_take isl_pw_aff *pa1,
  __isl_take isl_pw_aff *pa2)
{
  return isl_pw_aff_order_map(pa1, pa2, &isl_pw_aff_eq_set);
}
 
/* Return a map containing pairs of elements in the domains of "pa1" and "pa2"
 * where the function value of "pa1" is less than or equal to
 * the function value of "pa2".
 */
__isl_give isl_map *isl_pw_aff_le_map(__isl_take isl_pw_aff *pa1,
  __isl_take isl_pw_aff *pa2)
{
  return isl_pw_aff_order_map(pa1, pa2, &isl_pw_aff_le_set);
}
 
/* Return a map containing pairs of elements in the domains of "pa1" and "pa2"
 * where the function value of "pa1" is less than the function value of "pa2".
 */
__isl_give isl_map *isl_pw_aff_lt_map(__isl_take isl_pw_aff *pa1,
  __isl_take isl_pw_aff *pa2)
{
  return isl_pw_aff_order_map(pa1, pa2, &isl_pw_aff_lt_set);
}
 
/* Return a map containing pairs of elements in the domains of "pa1" and "pa2"
 * where the function value of "pa1" is greater than or equal to
 * the function value of "pa2".
 */
__isl_give isl_map *isl_pw_aff_ge_map(__isl_take isl_pw_aff *pa1,
  __isl_take isl_pw_aff *pa2)
{
  return isl_pw_aff_order_map(pa1, pa2, &isl_pw_aff_ge_set);
}
 
/* Return a map containing pairs of elements in the domains of "pa1" and "pa2"
 * where the function value of "pa1" is greater than the function value
 * of "pa2".
 */
__isl_give isl_map *isl_pw_aff_gt_map(__isl_take isl_pw_aff *pa1,
  __isl_take isl_pw_aff *pa2)
{
  return isl_pw_aff_order_map(pa1, pa2, &isl_pw_aff_gt_set);
}
 
/* Return a set containing those elements in the shared domain
 * of the elements of list1 and list2 where each element in list1
 * has the relation specified by "fn" with each element in list2.
 */
static __isl_give isl_set *pw_aff_list_set(__isl_take isl_pw_aff_list *list1,
  __isl_take isl_pw_aff_list *list2,
  __isl_give isl_set *(*fn)(__isl_take isl_pw_aff *pwaff1,
            __isl_take isl_pw_aff *pwaff2))
{
  int i, j;
  isl_ctx *ctx;
  isl_set *set;
 
  if (!list1 || !list2)
    goto error;
 
  ctx = isl_pw_aff_list_get_ctx(list1);
  if (list1->n < 1 || list2->n < 1)
    isl_die(ctx, isl_error_invalid,
      "list should contain at least one element", goto error);
 
  set = isl_set_universe(isl_pw_aff_get_domain_space(list1->p[0]));
  for (i = 0; i < list1->n; ++i)
    for (j = 0; j < list2->n; ++j) {
      isl_set *set_ij;
 
      set_ij = fn(isl_pw_aff_copy(list1->p[i]),
            isl_pw_aff_copy(list2->p[j]));
      set = isl_set_intersect(set, set_ij);
    }
 
  isl_pw_aff_list_free(list1);
  isl_pw_aff_list_free(list2);
  return set;
error:
  isl_pw_aff_list_free(list1);
  isl_pw_aff_list_free(list2);
  return NULL;
}
 
/* Return a set containing those elements in the shared domain
 * of the elements of list1 and list2 where each element in list1
 * is equal to each element in list2.
 */
__isl_give isl_set *isl_pw_aff_list_eq_set(__isl_take isl_pw_aff_list *list1,
  __isl_take isl_pw_aff_list *list2)
{
  return pw_aff_list_set(list1, list2, &isl_pw_aff_eq_set);
}
 
__isl_give isl_set *isl_pw_aff_list_ne_set(__isl_take isl_pw_aff_list *list1,
  __isl_take isl_pw_aff_list *list2)
{
  return pw_aff_list_set(list1, list2, &isl_pw_aff_ne_set);
}
 
/* Return a set containing those elements in the shared domain
 * of the elements of list1 and list2 where each element in list1
 * is less than or equal to each element in list2.
 */
__isl_give isl_set *isl_pw_aff_list_le_set(__isl_take isl_pw_aff_list *list1,
  __isl_take isl_pw_aff_list *list2)
{
  return pw_aff_list_set(list1, list2, &isl_pw_aff_le_set);
}
 
__isl_give isl_set *isl_pw_aff_list_lt_set(__isl_take isl_pw_aff_list *list1,
  __isl_take isl_pw_aff_list *list2)
{
  return pw_aff_list_set(list1, list2, &isl_pw_aff_lt_set);
}
 
__isl_give isl_set *isl_pw_aff_list_ge_set(__isl_take isl_pw_aff_list *list1,
  __isl_take isl_pw_aff_list *list2)
{
  return pw_aff_list_set(list1, list2, &isl_pw_aff_ge_set);
}
 
__isl_give isl_set *isl_pw_aff_list_gt_set(__isl_take isl_pw_aff_list *list1,
  __isl_take isl_pw_aff_list *list2)
{
  return pw_aff_list_set(list1, list2, &isl_pw_aff_gt_set);
}
 
 
/* Return a set containing those elements in the shared domain
 * of pwaff1 and pwaff2 where pwaff1 is not equal to pwaff2.
 */
__isl_give isl_set *isl_pw_aff_ne_set(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  isl_set *set_lt, *set_gt;
 
  isl_pw_aff_align_params_bin(&pwaff1, &pwaff2);
  set_lt = isl_pw_aff_lt_set(isl_pw_aff_copy(pwaff1),
           isl_pw_aff_copy(pwaff2));
  set_gt = isl_pw_aff_gt_set(pwaff1, pwaff2);
  return isl_set_union_disjoint(set_lt, set_gt);
}
 
__isl_give isl_pw_aff *isl_pw_aff_scale_down(__isl_take isl_pw_aff *pwaff,
  isl_int v)
{
  int i;
 
  if (isl_int_is_one(v))
    return pwaff;
  if (!isl_int_is_pos(v))
    isl_die(isl_pw_aff_get_ctx(pwaff), isl_error_invalid,
      "factor needs to be positive",
      return isl_pw_aff_free(pwaff));
  pwaff = isl_pw_aff_cow(pwaff);
  if (!pwaff)
    return NULL;
  if (pwaff->n == 0)
    return pwaff;
 
  for (i = 0; i < pwaff->n; ++i) {
    pwaff->p[i].aff = isl_aff_scale_down(pwaff->p[i].aff, v);
    if (!pwaff->p[i].aff)
      return isl_pw_aff_free(pwaff);
  }
 
  return pwaff;
}
 
__isl_give isl_pw_aff *isl_pw_aff_floor(__isl_take isl_pw_aff *pwaff)
{
  struct isl_pw_aff_un_op_control control = { .fn_base = &isl_aff_floor };
  return isl_pw_aff_un_op(pwaff, &control);
}
 
__isl_give isl_pw_aff *isl_pw_aff_ceil(__isl_take isl_pw_aff *pwaff)
{
  struct isl_pw_aff_un_op_control control = { .fn_base = &isl_aff_ceil };
  return isl_pw_aff_un_op(pwaff, &control);
}
 
/* Assuming that "cond1" and "cond2" are disjoint,
 * return an affine expression that is equal to pwaff1 on cond1
 * and to pwaff2 on cond2.
 */
static __isl_give isl_pw_aff *isl_pw_aff_select(
  __isl_take isl_set *cond1, __isl_take isl_pw_aff *pwaff1,
  __isl_take isl_set *cond2, __isl_take isl_pw_aff *pwaff2)
{
  pwaff1 = isl_pw_aff_intersect_domain(pwaff1, cond1);
  pwaff2 = isl_pw_aff_intersect_domain(pwaff2, cond2);
 
  return isl_pw_aff_add_disjoint(pwaff1, pwaff2);
}
 
/* Return an affine expression that is equal to pwaff_true for elements
 * where "cond" is non-zero and to pwaff_false for elements where "cond"
 * is zero.
 * That is, return cond ? pwaff_true : pwaff_false;
 *
 * If "cond" involves and NaN, then we conservatively return a NaN
 * on its entire domain.  In principle, we could consider the pieces
 * where it is NaN separately from those where it is not.
 *
 * If "pwaff_true" and "pwaff_false" are obviously equal to each other,
 * then only use the domain of "cond" to restrict the domain.
 */
__isl_give isl_pw_aff *isl_pw_aff_cond(__isl_take isl_pw_aff *cond,
  __isl_take isl_pw_aff *pwaff_true, __isl_take isl_pw_aff *pwaff_false)
{
  isl_set *cond_true, *cond_false;
  isl_bool equal;
 
  if (!cond)
    goto error;
  if (isl_pw_aff_involves_nan(cond)) {
    isl_space *space = isl_pw_aff_get_domain_space(cond);
    isl_local_space *ls = isl_local_space_from_space(space);
    isl_pw_aff_free(cond);
    isl_pw_aff_free(pwaff_true);
    isl_pw_aff_free(pwaff_false);
    return isl_pw_aff_nan_on_domain(ls);
  }
 
  pwaff_true = isl_pw_aff_align_params(pwaff_true,
              isl_pw_aff_get_space(pwaff_false));
  pwaff_false = isl_pw_aff_align_params(pwaff_false,
              isl_pw_aff_get_space(pwaff_true));
  equal = isl_pw_aff_plain_is_equal(pwaff_true, pwaff_false);
  if (equal < 0)
    goto error;
  if (equal) {
    isl_set *dom;
 
    dom = isl_set_coalesce(isl_pw_aff_domain(cond));
    isl_pw_aff_free(pwaff_false);
    return isl_pw_aff_intersect_domain(pwaff_true, dom);
  }
 
  cond_true = isl_pw_aff_non_zero_set(isl_pw_aff_copy(cond));
  cond_false = isl_pw_aff_zero_set(cond);
  return isl_pw_aff_select(cond_true, pwaff_true,
         cond_false, pwaff_false);
error:
  isl_pw_aff_free(cond);
  isl_pw_aff_free(pwaff_true);
  isl_pw_aff_free(pwaff_false);
  return NULL;
}
 
isl_bool isl_aff_is_cst(__isl_keep isl_aff *aff)
{
  int pos;
 
  if (!aff)
    return isl_bool_error;
 
  pos = isl_seq_first_non_zero(aff->v->el + 2, aff->v->size - 2);
  return isl_bool_ok(pos == -1);
}
 
/* Check whether pwaff is a piecewise constant.
 */
isl_bool isl_pw_aff_is_cst(__isl_keep isl_pw_aff *pwaff)
{
  int i;
 
  if (!pwaff)
    return isl_bool_error;
 
  for (i = 0; i < pwaff->n; ++i) {
    isl_bool is_cst = isl_aff_is_cst(pwaff->p[i].aff);
    if (is_cst < 0 || !is_cst)
      return is_cst;
  }
 
  return isl_bool_true;
}
 
/* Return the product of "aff1" and "aff2".
 *
 * If either of the two is NaN, then the result is NaN.
 *
 * Otherwise, at least one of "aff1" or "aff2" needs to be a constant.
 */
__isl_give isl_aff *isl_aff_mul(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  if (!aff1 || !aff2)
    goto error;
 
  if (isl_aff_is_nan(aff1)) {
    isl_aff_free(aff2);
    return aff1;
  }
  if (isl_aff_is_nan(aff2)) {
    isl_aff_free(aff1);
    return aff2;
  }
 
  if (!isl_aff_is_cst(aff2) && isl_aff_is_cst(aff1))
    return isl_aff_mul(aff2, aff1);
 
  if (!isl_aff_is_cst(aff2))
    isl_die(isl_aff_get_ctx(aff1), isl_error_invalid,
      "at least one affine expression should be constant",
      goto error);
 
  aff1 = isl_aff_cow(aff1);
  if (!aff1 || !aff2)
    goto error;
 
  aff1 = isl_aff_scale(aff1, aff2->v->el[1]);
  aff1 = isl_aff_scale_down(aff1, aff2->v->el[0]);
 
  isl_aff_free(aff2);
  return aff1;
error:
  isl_aff_free(aff1);
  isl_aff_free(aff2);
  return NULL;
}
 
/* Divide "aff1" by "aff2", assuming "aff2" is a constant.
 *
 * If either of the two is NaN, then the result is NaN.
 * A division by zero also results in NaN.
 */
__isl_give isl_aff *isl_aff_div(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  isl_bool is_cst, is_zero;
  int neg;
 
  if (!aff1 || !aff2)
    goto error;
 
  if (isl_aff_is_nan(aff1)) {
    isl_aff_free(aff2);
    return aff1;
  }
  if (isl_aff_is_nan(aff2)) {
    isl_aff_free(aff1);
    return aff2;
  }
 
  is_cst = isl_aff_is_cst(aff2);
  if (is_cst < 0)
    goto error;
  if (!is_cst)
    isl_die(isl_aff_get_ctx(aff2), isl_error_invalid,
      "second argument should be a constant", goto error);
  is_zero = isl_aff_plain_is_zero(aff2);
  if (is_zero < 0)
    goto error;
  if (is_zero)
    return set_nan_free(aff1, aff2);
 
  neg = isl_int_is_neg(aff2->v->el[1]);
  if (neg) {
    isl_int_neg(aff2->v->el[0], aff2->v->el[0]);
    isl_int_neg(aff2->v->el[1], aff2->v->el[1]);
  }
 
  aff1 = isl_aff_scale(aff1, aff2->v->el[0]);
  aff1 = isl_aff_scale_down(aff1, aff2->v->el[1]);
 
  if (neg) {
    isl_int_neg(aff2->v->el[0], aff2->v->el[0]);
    isl_int_neg(aff2->v->el[1], aff2->v->el[1]);
  }
 
  isl_aff_free(aff2);
  return aff1;
error:
  isl_aff_free(aff1);
  isl_aff_free(aff2);
  return NULL;
}
 
__isl_give isl_pw_aff *isl_pw_aff_add(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  isl_pw_aff_align_params_bin(&pwaff1, &pwaff2);
  return isl_pw_aff_on_shared_domain(pwaff1, pwaff2, &isl_aff_add);
}
 
__isl_give isl_pw_aff *isl_pw_aff_mul(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  isl_pw_aff_align_params_bin(&pwaff1, &pwaff2);
  return isl_pw_aff_on_shared_domain(pwaff1, pwaff2, &isl_aff_mul);
}
 
/* Divide "pa1" by "pa2", assuming "pa2" is a piecewise constant.
 */
__isl_give isl_pw_aff *isl_pw_aff_div(__isl_take isl_pw_aff *pa1,
  __isl_take isl_pw_aff *pa2)
{
  int is_cst;
 
  is_cst = isl_pw_aff_is_cst(pa2);
  if (is_cst < 0)
    goto error;
  if (!is_cst)
    isl_die(isl_pw_aff_get_ctx(pa2), isl_error_invalid,
      "second argument should be a piecewise constant",
      goto error);
  isl_pw_aff_align_params_bin(&pa1, &pa2);
  return isl_pw_aff_on_shared_domain(pa1, pa2, &isl_aff_div);
error:
  isl_pw_aff_free(pa1);
  isl_pw_aff_free(pa2);
  return NULL;
}
 
/* Compute the quotient of the integer division of "pa1" by "pa2"
 * with rounding towards zero.
 * "pa2" is assumed to be a piecewise constant.
 *
 * In particular, return
 *
 *  pa1 >= 0 ? floor(pa1/pa2) : ceil(pa1/pa2)
 *
 */
__isl_give isl_pw_aff *isl_pw_aff_tdiv_q(__isl_take isl_pw_aff *pa1,
  __isl_take isl_pw_aff *pa2)
{
  int is_cst;
  isl_set *cond;
  isl_pw_aff *f, *c;
 
  is_cst = isl_pw_aff_is_cst(pa2);
  if (is_cst < 0)
    goto error;
  if (!is_cst)
    isl_die(isl_pw_aff_get_ctx(pa2), isl_error_invalid,
      "second argument should be a piecewise constant",
      goto error);
 
  pa1 = isl_pw_aff_div(pa1, pa2);
 
  cond = isl_pw_aff_nonneg_set(isl_pw_aff_copy(pa1));
  f = isl_pw_aff_floor(isl_pw_aff_copy(pa1));
  c = isl_pw_aff_ceil(pa1);
  return isl_pw_aff_cond(isl_set_indicator_function(cond), f, c);
error:
  isl_pw_aff_free(pa1);
  isl_pw_aff_free(pa2);
  return NULL;
}
 
/* Compute the remainder of the integer division of "pa1" by "pa2"
 * with rounding towards zero.
 * "pa2" is assumed to be a piecewise constant.
 *
 * In particular, return
 *
 *  pa1 - pa2 * (pa1 >= 0 ? floor(pa1/pa2) : ceil(pa1/pa2))
 *
 */
__isl_give isl_pw_aff *isl_pw_aff_tdiv_r(__isl_take isl_pw_aff *pa1,
  __isl_take isl_pw_aff *pa2)
{
  int is_cst;
  isl_pw_aff *res;
 
  is_cst = isl_pw_aff_is_cst(pa2);
  if (is_cst < 0)
    goto error;
  if (!is_cst)
    isl_die(isl_pw_aff_get_ctx(pa2), isl_error_invalid,
      "second argument should be a piecewise constant",
      goto error);
  res = isl_pw_aff_tdiv_q(isl_pw_aff_copy(pa1), isl_pw_aff_copy(pa2));
  res = isl_pw_aff_mul(pa2, res);
  res = isl_pw_aff_sub(pa1, res);
  return res;
error:
  isl_pw_aff_free(pa1);
  isl_pw_aff_free(pa2);
  return NULL;
}
 
/* Does either of "pa1" or "pa2" involve any NaN?
 */
static isl_bool either_involves_nan(__isl_keep isl_pw_aff *pa1,
  __isl_keep isl_pw_aff *pa2)
{
  isl_bool has_nan;
 
  has_nan = isl_pw_aff_involves_nan(pa1);
  if (has_nan < 0 || has_nan)
    return has_nan;
  return isl_pw_aff_involves_nan(pa2);
}
 
/* Return a piecewise affine expression defined on the specified domain
 * that represents NaN.
 */
static __isl_give isl_pw_aff *nan_on_domain_set(__isl_take isl_set *dom)
{
  isl_local_space *ls;
  isl_pw_aff *pa;
 
  ls = isl_local_space_from_space(isl_set_get_space(dom));
  pa = isl_pw_aff_nan_on_domain(ls);
  pa = isl_pw_aff_intersect_domain(pa, dom);
 
  return pa;
}
 
/* Replace "pa1" and "pa2" (at least one of which involves a NaN)
 * by a NaN on their shared domain.
 *
 * In principle, the result could be refined to only being NaN
 * on the parts of this domain where at least one of "pa1" or "pa2" is NaN.
 */
static __isl_give isl_pw_aff *replace_by_nan(__isl_take isl_pw_aff *pa1,
  __isl_take isl_pw_aff *pa2)
{
  isl_set *dom;
 
  dom = isl_set_intersect(isl_pw_aff_domain(pa1), isl_pw_aff_domain(pa2));
  return nan_on_domain_set(dom);
}
 
static __isl_give isl_pw_aff *pw_aff_min(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  isl_set *le;
  isl_set *dom;
 
  dom = isl_set_intersect(isl_pw_aff_domain(isl_pw_aff_copy(pwaff1)),
        isl_pw_aff_domain(isl_pw_aff_copy(pwaff2)));
  le = isl_pw_aff_le_set(isl_pw_aff_copy(pwaff1),
        isl_pw_aff_copy(pwaff2));
  dom = isl_set_subtract(dom, isl_set_copy(le));
  return isl_pw_aff_select(le, pwaff1, dom, pwaff2);
}
 
static __isl_give isl_pw_aff *pw_aff_max(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  isl_set *ge;
  isl_set *dom;
 
  dom = isl_set_intersect(isl_pw_aff_domain(isl_pw_aff_copy(pwaff1)),
        isl_pw_aff_domain(isl_pw_aff_copy(pwaff2)));
  ge = isl_pw_aff_ge_set(isl_pw_aff_copy(pwaff1),
        isl_pw_aff_copy(pwaff2));
  dom = isl_set_subtract(dom, isl_set_copy(ge));
  return isl_pw_aff_select(ge, pwaff1, dom, pwaff2);
}
 
/* Return an expression for the minimum (if "max" is not set) or
 * the maximum (if "max" is set) of "pa1" and "pa2".
 * If either expression involves any NaN, then return a NaN
 * on the shared domain as result.
 */
static __isl_give isl_pw_aff *pw_aff_min_max(__isl_take isl_pw_aff *pa1,
  __isl_take isl_pw_aff *pa2, int max)
{
  isl_bool has_nan;
 
  has_nan = either_involves_nan(pa1, pa2);
  if (has_nan < 0)
    pa1 = isl_pw_aff_free(pa1);
  else if (has_nan)
    return replace_by_nan(pa1, pa2);
 
  isl_pw_aff_align_params_bin(&pa1, &pa2);
  if (max)
    return pw_aff_max(pa1, pa2);
  else
    return pw_aff_min(pa1, pa2);
}
 
/* Return an expression for the minimum of "pwaff1" and "pwaff2".
 */
__isl_give isl_pw_aff *isl_pw_aff_min(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  return pw_aff_min_max(pwaff1, pwaff2, 0);
}
 
/* Return an expression for the maximum of "pwaff1" and "pwaff2".
 */
__isl_give isl_pw_aff *isl_pw_aff_max(__isl_take isl_pw_aff *pwaff1,
  __isl_take isl_pw_aff *pwaff2)
{
  return pw_aff_min_max(pwaff1, pwaff2, 1);
}
 
/* Does "pa" not involve any NaN?
 */
static isl_bool pw_aff_no_nan(__isl_keep isl_pw_aff *pa, void *user)
{
  return isl_bool_not(isl_pw_aff_involves_nan(pa));
}
 
/* Does any element of "list" involve any NaN?
 *
 * That is, is it not the case that every element does not involve any NaN?
 */
static isl_bool isl_pw_aff_list_involves_nan(__isl_keep isl_pw_aff_list *list)
{
  return isl_bool_not(isl_pw_aff_list_every(list, &pw_aff_no_nan, NULL));
}
 
/* Replace "list" (consisting of "n" elements, of which
 * at least one element involves a NaN)
 * by a NaN on the shared domain of the elements.
 *
 * In principle, the result could be refined to only being NaN
 * on the parts of this domain where at least one of the elements is NaN.
 */
static __isl_give isl_pw_aff *replace_list_by_nan(
  __isl_take isl_pw_aff_list *list, int n)
{
  int i;
  isl_set *dom;
 
  dom = isl_pw_aff_domain(isl_pw_aff_list_get_at(list, 0));
  for (i = 1; i < n; ++i) {
    isl_set *dom_i;
 
    dom_i = isl_pw_aff_domain(isl_pw_aff_list_get_at(list, i));
    dom = isl_set_intersect(dom, dom_i);
  }
 
  isl_pw_aff_list_free(list);
  return nan_on_domain_set(dom);
}
 
/* Return the set where the element at "pos1" of "list" is less than or
 * equal to the element at "pos2".
 * Equality is only allowed if "pos1" is smaller than "pos2".
 */
static __isl_give isl_set *less(__isl_keep isl_pw_aff_list *list,
  int pos1, int pos2)
{
  isl_pw_aff *pa1, *pa2;
 
  pa1 = isl_pw_aff_list_get_at(list, pos1);
  pa2 = isl_pw_aff_list_get_at(list, pos2);
 
  if (pos1 < pos2)
    return isl_pw_aff_le_set(pa1, pa2);
  else
    return isl_pw_aff_lt_set(pa1, pa2);
}
 
/* Return an isl_pw_aff that maps each element in the intersection of the
 * domains of the piecewise affine expressions in "list"
 * to the maximal (if "max" is set) or minimal (if "max" is not set)
 * expression in "list" at that element.
 * If any expression involves any NaN, then return a NaN
 * on the shared domain as result.
 *
 * If "list" has n elements, then the result consists of n pieces,
 * where, in the case of a minimum, each piece has as value expression
 * the value expression of one of the elements and as domain
 * the set of elements where that value expression
 * is less than (or equal) to the other value expressions.
 * In the case of a maximum, the condition is
 * that all the other value expressions are less than (or equal)
 * to the given value expression.
 *
 * In order to produce disjoint pieces, a pair of elements
 * in the original domain is only allowed to be equal to each other
 * on exactly one of the two pieces corresponding to the two elements.
 * The position in the list is used to break ties.
 * In particular, in the case of a minimum,
 * in the piece corresponding to a given element,
 * this element is allowed to be equal to any later element in the list,
 * but not to any earlier element in the list.
 */
static __isl_give isl_pw_aff *isl_pw_aff_list_opt(
  __isl_take isl_pw_aff_list *list, int max)
{
  int i, j;
  isl_bool has_nan;
  isl_size n;
  isl_space *space;
  isl_pw_aff *pa, *res;
 
  n = isl_pw_aff_list_size(list);
  if (n < 0)
    goto error;
  if (n < 1)
    isl_die(isl_pw_aff_list_get_ctx(list), isl_error_invalid,
      "list should contain at least one element", goto error);
 
  has_nan = isl_pw_aff_list_involves_nan(list);
  if (has_nan < 0)
    goto error;
  if (has_nan)
    return replace_list_by_nan(list, n);
 
  pa = isl_pw_aff_list_get_at(list, 0);
  space = isl_pw_aff_get_space(pa);
  isl_pw_aff_free(pa);
  res = isl_pw_aff_empty(space);
 
  for (i = 0; i < n; ++i) {
    pa = isl_pw_aff_list_get_at(list, i);
    for (j = 0; j < n; ++j) {
      isl_set *dom;
 
      if (j == i)
        continue;
      if (max)
        dom = less(list, j, i);
      else
        dom = less(list, i, j);
 
      pa = isl_pw_aff_intersect_domain(pa, dom);
    }
    res =  isl_pw_aff_add_disjoint(res, pa);
  }
 
  isl_pw_aff_list_free(list);
  return res;
error:
  isl_pw_aff_list_free(list);
  return NULL;
}
 
/* Return an isl_pw_aff that maps each element in the intersection of the
 * domains of the elements of list to the minimal corresponding affine
 * expression.
 */
__isl_give isl_pw_aff *isl_pw_aff_list_min(__isl_take isl_pw_aff_list *list)
{
  return isl_pw_aff_list_opt(list, 0);
}
 
/* Return an isl_pw_aff that maps each element in the intersection of the
 * domains of the elements of list to the maximal corresponding affine
 * expression.
 */
__isl_give isl_pw_aff *isl_pw_aff_list_max(__isl_take isl_pw_aff_list *list)
{
  return isl_pw_aff_list_opt(list, 1);
}
 
/* Mark the domains of "pwaff" as rational.
 */
__isl_give isl_pw_aff *isl_pw_aff_set_rational(__isl_take isl_pw_aff *pwaff)
{
  int i;
 
  pwaff = isl_pw_aff_cow(pwaff);
  if (!pwaff)
    return NULL;
  if (pwaff->n == 0)
    return pwaff;
 
  for (i = 0; i < pwaff->n; ++i) {
    pwaff->p[i].set = isl_set_set_rational(pwaff->p[i].set);
    if (!pwaff->p[i].set)
      return isl_pw_aff_free(pwaff);
  }
 
  return pwaff;
}
 
/* Mark the domains of the elements of "list" as rational.
 */
__isl_give isl_pw_aff_list *isl_pw_aff_list_set_rational(
  __isl_take isl_pw_aff_list *list)
{
  int i, n;
 
  if (!list)
    return NULL;
  if (list->n == 0)
    return list;
 
  n = list->n;
  for (i = 0; i < n; ++i) {
    isl_pw_aff *pa;
 
    pa = isl_pw_aff_list_get_pw_aff(list, i);
    pa = isl_pw_aff_set_rational(pa);
    list = isl_pw_aff_list_set_pw_aff(list, i, pa);
  }
 
  return list;
}
 
/* Do the parameters of "aff" match those of "space"?
 */
isl_bool isl_aff_matching_params(__isl_keep isl_aff *aff,
  __isl_keep isl_space *space)
{
  isl_space *aff_space;
  isl_bool match;
 
  if (!aff || !space)
    return isl_bool_error;
 
  aff_space = isl_aff_get_domain_space(aff);
 
  match = isl_space_has_equal_params(space, aff_space);
 
  isl_space_free(aff_space);
  return match;
}
 
/* Check that the domain space of "aff" matches "space".
 */
isl_stat isl_aff_check_match_domain_space(__isl_keep isl_aff *aff,
  __isl_keep isl_space *space)
{
  isl_space *aff_space;
  isl_bool match;
 
  if (!aff || !space)
    return isl_stat_error;
 
  aff_space = isl_aff_get_domain_space(aff);
 
  match = isl_space_has_equal_params(space, aff_space);
  if (match < 0)
    goto error;
  if (!match)
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "parameters don't match", goto error);
  match = isl_space_tuple_is_equal(space, isl_dim_in,
          aff_space, isl_dim_set);
  if (match < 0)
    goto error;
  if (!match)
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "domains don't match", goto error);
  isl_space_free(aff_space);
  return isl_stat_ok;
error:
  isl_space_free(aff_space);
  return isl_stat_error;
}
 
/* Return the shared (universe) domain of the elements of "ma".
 *
 * Since an isl_multi_aff (and an isl_aff) is always total,
 * the domain is always the universe set in its domain space.
 * This is a helper function for use in the generic isl_multi_*_bind.
 */
static __isl_give isl_basic_set *isl_multi_aff_domain(
  __isl_take isl_multi_aff *ma)
{
  isl_space *space;
 
  space = isl_multi_aff_get_space(ma);
  isl_multi_aff_free(ma);
 
  return isl_basic_set_universe(isl_space_domain(space));
}
 
#undef BASE
#define BASE aff
 
#include <isl_multi_no_explicit_domain.c>
#include <isl_multi_templ.c>
#include <isl_multi_un_op_templ.c>
#include <isl_multi_bin_val_templ.c>
#include <isl_multi_add_constant_templ.c>
#include <isl_multi_align_set.c>
#include <isl_multi_arith_templ.c>
#include <isl_multi_bind_domain_templ.c>
#include <isl_multi_cmp.c>
#include <isl_multi_dim_id_templ.c>
#include <isl_multi_dims.c>
#include <isl_multi_domain_reverse_templ.c>
#include <isl_multi_floor.c>
#include <isl_multi_from_base_templ.c>
#include <isl_multi_identity_templ.c>
#include <isl_multi_insert_domain_templ.c>
#include <isl_multi_locals_templ.c>
#include <isl_multi_move_dims_templ.c>
#include <isl_multi_nan_templ.c>
#include <isl_multi_product_templ.c>
#include <isl_multi_splice_templ.c>
#include <isl_multi_tuple_id_templ.c>
#include <isl_multi_unbind_params_templ.c>
#include <isl_multi_zero_templ.c>
 
#undef DOMBASE
#define DOMBASE set
#include <isl_multi_check_domain_templ.c>
#include <isl_multi_apply_set_no_explicit_domain_templ.c>
#include <isl_multi_gist.c>
 
#undef DOMBASE
#define DOMBASE basic_set
#include <isl_multi_bind_templ.c>
 
/* Construct an isl_multi_aff living in "space" that corresponds
 * to the affine transformation matrix "mat".
 */
__isl_give isl_multi_aff *isl_multi_aff_from_aff_mat(
  __isl_take isl_space *space, __isl_take isl_mat *mat)
{
  isl_ctx *ctx;
  isl_local_space *ls = NULL;
  isl_multi_aff *ma = NULL;
  isl_size n_row, n_col, n_out, total;
  int i;
 
  if (!space || !mat)
    goto error;
 
  ctx = isl_mat_get_ctx(mat);
 
  n_row = isl_mat_rows(mat);
  n_col = isl_mat_cols(mat);
  n_out = isl_space_dim(space, isl_dim_out);
  total = isl_space_dim(space, isl_dim_all);
  if (n_row < 0 || n_col < 0 || n_out < 0 || total < 0)
    goto error;
  if (n_row < 1)
    isl_die(ctx, isl_error_invalid,
      "insufficient number of rows", goto error);
  if (n_col < 1)
    isl_die(ctx, isl_error_invalid,
      "insufficient number of columns", goto error);
  if (1 + n_out != n_row || 2 + total != n_row + n_col)
    isl_die(ctx, isl_error_invalid,
      "dimension mismatch", goto error);
 
  ma = isl_multi_aff_zero(isl_space_copy(space));
  space = isl_space_domain(space);
  ls = isl_local_space_from_space(isl_space_copy(space));
 
  for (i = 0; i < n_row - 1; ++i) {
    isl_vec *v;
    isl_aff *aff;
 
    v = isl_vec_alloc(ctx, 1 + n_col);
    if (!v)
      goto error;
    isl_int_set(v->el[0], mat->row[0][0]);
    isl_seq_cpy(v->el + 1, mat->row[1 + i], n_col);
    v = isl_vec_normalize(v);
    aff = isl_aff_alloc_vec_validated(isl_local_space_copy(ls), v);
    ma = isl_multi_aff_set_aff(ma, i, aff);
  }
 
  isl_space_free(space);
  isl_local_space_free(ls);
  isl_mat_free(mat);
  return ma;
error:
  isl_space_free(space);
  isl_local_space_free(ls);
  isl_mat_free(mat);
  isl_multi_aff_free(ma);
  return NULL;
}
 
/* Return the constant terms of the affine expressions of "ma".
 */
__isl_give isl_multi_val *isl_multi_aff_get_constant_multi_val(
  __isl_keep isl_multi_aff *ma)
{
  int i;
  isl_size n;
  isl_space *space;
  isl_multi_val *mv;
 
  n = isl_multi_aff_size(ma);
  if (n < 0)
    return NULL;
  space = isl_space_range(isl_multi_aff_get_space(ma));
  space = isl_space_drop_all_params(space);
  mv = isl_multi_val_zero(space);
 
  for (i = 0; i < n; ++i) {
    isl_aff *aff;
    isl_val *val;
 
    aff = isl_multi_aff_get_at(ma, i);
    val = isl_aff_get_constant_val(aff);
    isl_aff_free(aff);
    mv = isl_multi_val_set_at(mv, i, val);
  }
 
  return mv;
}
 
/* Remove any internal structure of the domain of "ma".
 * If there is any such internal structure in the input,
 * then the name of the corresponding space is also removed.
 */
__isl_give isl_multi_aff *isl_multi_aff_flatten_domain(
  __isl_take isl_multi_aff *ma)
{
  isl_space *space;
 
  if (!ma)
    return NULL;
 
  if (!ma->space->nested[0])
    return ma;
 
  space = isl_multi_aff_get_space(ma);
  space = isl_space_flatten_domain(space);
  ma = isl_multi_aff_reset_space(ma, space);
 
  return ma;
}
 
/* Given a map space, return an isl_multi_aff that maps a wrapped copy
 * of the space to its domain.
 */
__isl_give isl_multi_aff *isl_multi_aff_domain_map(__isl_take isl_space *space)
{
  int i;
  isl_size n_in;
  isl_local_space *ls;
  isl_multi_aff *ma;
 
  if (!space)
    return NULL;
  if (!isl_space_is_map(space))
    isl_die(isl_space_get_ctx(space), isl_error_invalid,
      "not a map space", goto error);
 
  n_in = isl_space_dim(space, isl_dim_in);
  if (n_in < 0)
    goto error;
  space = isl_space_domain_map(space);
 
  ma = isl_multi_aff_alloc(isl_space_copy(space));
  if (n_in == 0) {
    isl_space_free(space);
    return ma;
  }
 
  space = isl_space_domain(space);
  ls = isl_local_space_from_space(space);
  for (i = 0; i < n_in; ++i) {
    isl_aff *aff;
 
    aff = isl_aff_var_on_domain(isl_local_space_copy(ls),
            isl_dim_set, i);
    ma = isl_multi_aff_set_aff(ma, i, aff);
  }
  isl_local_space_free(ls);
  return ma;
error:
  isl_space_free(space);
  return NULL;
}
 
/* This function performs the same operation as isl_multi_aff_domain_map,
 * but is considered as a function on an isl_space when exported.
 */
__isl_give isl_multi_aff *isl_space_domain_map_multi_aff(
  __isl_take isl_space *space)
{
  return isl_multi_aff_domain_map(space);
}
 
/* Given a map space, return an isl_multi_aff that maps a wrapped copy
 * of the space to its range.
 */
__isl_give isl_multi_aff *isl_multi_aff_range_map(__isl_take isl_space *space)
{
  int i;
  isl_size n_in, n_out;
  isl_local_space *ls;
  isl_multi_aff *ma;
 
  if (!space)
    return NULL;
  if (!isl_space_is_map(space))
    isl_die(isl_space_get_ctx(space), isl_error_invalid,
      "not a map space", goto error);
 
  n_in = isl_space_dim(space, isl_dim_in);
  n_out = isl_space_dim(space, isl_dim_out);
  if (n_in < 0 || n_out < 0)
    goto error;
  space = isl_space_range_map(space);
 
  ma = isl_multi_aff_alloc(isl_space_copy(space));
  if (n_out == 0) {
    isl_space_free(space);
    return ma;
  }
 
  space = isl_space_domain(space);
  ls = isl_local_space_from_space(space);
  for (i = 0; i < n_out; ++i) {
    isl_aff *aff;
 
    aff = isl_aff_var_on_domain(isl_local_space_copy(ls),
            isl_dim_set, n_in + i);
    ma = isl_multi_aff_set_aff(ma, i, aff);
  }
  isl_local_space_free(ls);
  return ma;
error:
  isl_space_free(space);
  return NULL;
}
 
/* This function performs the same operation as isl_multi_aff_range_map,
 * but is considered as a function on an isl_space when exported.
 */
__isl_give isl_multi_aff *isl_space_range_map_multi_aff(
  __isl_take isl_space *space)
{
  return isl_multi_aff_range_map(space);
}
 
/* Given a map space, return an isl_pw_multi_aff that maps a wrapped copy
 * of the space to its domain.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_domain_map(
  __isl_take isl_space *space)
{
  return isl_pw_multi_aff_from_multi_aff(isl_multi_aff_domain_map(space));
}
 
/* This function performs the same operation as isl_pw_multi_aff_domain_map,
 * but is considered as a function on an isl_space when exported.
 */
__isl_give isl_pw_multi_aff *isl_space_domain_map_pw_multi_aff(
  __isl_take isl_space *space)
{
  return isl_pw_multi_aff_domain_map(space);
}
 
/* Given a map space, return an isl_pw_multi_aff that maps a wrapped copy
 * of the space to its range.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_range_map(
  __isl_take isl_space *space)
{
  return isl_pw_multi_aff_from_multi_aff(isl_multi_aff_range_map(space));
}
 
/* This function performs the same operation as isl_pw_multi_aff_range_map,
 * but is considered as a function on an isl_space when exported.
 */
__isl_give isl_pw_multi_aff *isl_space_range_map_pw_multi_aff(
  __isl_take isl_space *space)
{
  return isl_pw_multi_aff_range_map(space);
}
 
/* Given the space of a set and a range of set dimensions,
 * construct an isl_multi_aff that projects out those dimensions.
 */
__isl_give isl_multi_aff *isl_multi_aff_project_out_map(
  __isl_take isl_space *space, enum isl_dim_type type,
  unsigned first, unsigned n)
{
  int i;
  isl_size dim;
  isl_local_space *ls;
  isl_multi_aff *ma;
 
  if (!space)
    return NULL;
  if (!isl_space_is_set(space))
    isl_die(isl_space_get_ctx(space), isl_error_unsupported,
      "expecting set space", goto error);
  if (type != isl_dim_set)
    isl_die(isl_space_get_ctx(space), isl_error_invalid,
      "only set dimensions can be projected out", goto error);
  if (isl_space_check_range(space, type, first, n) < 0)
    goto error;
 
  dim = isl_space_dim(space, isl_dim_set);
  if (dim < 0)
    goto error;
 
  space = isl_space_from_domain(space);
  space = isl_space_add_dims(space, isl_dim_out, dim - n);
 
  if (dim == n)
    return isl_multi_aff_alloc(space);
 
  ma = isl_multi_aff_alloc(isl_space_copy(space));
  space = isl_space_domain(space);
  ls = isl_local_space_from_space(space);
 
  for (i = 0; i < first; ++i) {
    isl_aff *aff;
 
    aff = isl_aff_var_on_domain(isl_local_space_copy(ls),
            isl_dim_set, i);
    ma = isl_multi_aff_set_aff(ma, i, aff);
  }
 
  for (i = 0; i < dim - (first + n); ++i) {
    isl_aff *aff;
 
    aff = isl_aff_var_on_domain(isl_local_space_copy(ls),
            isl_dim_set, first + n + i);
    ma = isl_multi_aff_set_aff(ma, first + i, aff);
  }
 
  isl_local_space_free(ls);
  return ma;
error:
  isl_space_free(space);
  return NULL;
}
 
/* Given the space of a set and a range of set dimensions,
 * construct an isl_pw_multi_aff that projects out those dimensions.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_project_out_map(
  __isl_take isl_space *space, enum isl_dim_type type,
  unsigned first, unsigned n)
{
  isl_multi_aff *ma;
 
  ma = isl_multi_aff_project_out_map(space, type, first, n);
  return isl_pw_multi_aff_from_multi_aff(ma);
}
 
/* This function performs the same operation as isl_pw_multi_aff_from_multi_aff,
 * but is considered as a function on an isl_multi_aff when exported.
 */
__isl_give isl_pw_multi_aff *isl_multi_aff_to_pw_multi_aff(
  __isl_take isl_multi_aff *ma)
{
  return isl_pw_multi_aff_from_multi_aff(ma);
}
 
/* Create a piecewise multi-affine expression in the given space that maps each
 * input dimension to the corresponding output dimension.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_identity(
  __isl_take isl_space *space)
{
  return isl_pw_multi_aff_from_multi_aff(isl_multi_aff_identity(space));
}
 
/* Create a piecewise multi expression that maps elements in the given space
 * to themselves.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_identity_on_domain_space(
  __isl_take isl_space *space)
{
  isl_multi_aff *ma;
 
  ma = isl_multi_aff_identity_on_domain_space(space);
  return isl_pw_multi_aff_from_multi_aff(ma);
}
 
/* This function performs the same operation as
 * isl_pw_multi_aff_identity_on_domain_space,
 * but is considered as a function on an isl_space when exported.
 */
__isl_give isl_pw_multi_aff *isl_space_identity_pw_multi_aff_on_domain(
  __isl_take isl_space *space)
{
  return isl_pw_multi_aff_identity_on_domain_space(space);
}
 
/* Exploit the equalities in "eq" to simplify the affine expressions.
 */
static __isl_give isl_multi_aff *isl_multi_aff_substitute_equalities(
  __isl_take isl_multi_aff *maff, __isl_take isl_basic_set *eq)
{
  isl_size n;
  int i;
 
  n = isl_multi_aff_size(maff);
  if (n < 0 || !eq)
    goto error;
 
  for (i = 0; i < n; ++i) {
    isl_aff *aff;
 
    aff = isl_multi_aff_take_at(maff, i);
    aff = isl_aff_substitute_equalities(aff,
                isl_basic_set_copy(eq));
    maff = isl_multi_aff_restore_at(maff, i, aff);
  }
 
  isl_basic_set_free(eq);
  return maff;
error:
  isl_basic_set_free(eq);
  isl_multi_aff_free(maff);
  return NULL;
}
 
__isl_give isl_multi_aff *isl_multi_aff_scale(__isl_take isl_multi_aff *maff,
  isl_int f)
{
  isl_size n;
  int i;
 
  n = isl_multi_aff_size(maff);
  if (n < 0)
    return isl_multi_aff_free(maff);
 
  for (i = 0; i < n; ++i) {
    isl_aff *aff;
 
    aff = isl_multi_aff_take_at(maff, i);
    aff = isl_aff_scale(aff, f);
    maff = isl_multi_aff_restore_at(maff, i, aff);
  }
 
  return maff;
}
 
__isl_give isl_multi_aff *isl_multi_aff_add_on_domain(__isl_keep isl_set *dom,
  __isl_take isl_multi_aff *maff1, __isl_take isl_multi_aff *maff2)
{
  maff1 = isl_multi_aff_add(maff1, maff2);
  maff1 = isl_multi_aff_gist(maff1, isl_set_copy(dom));
  return maff1;
}
 
isl_bool isl_multi_aff_is_empty(__isl_keep isl_multi_aff *maff)
{
  if (!maff)
    return isl_bool_error;
 
  return isl_bool_false;
}
 
/* Return the set of domain elements where "ma1" is lexicographically
 * smaller than or equal to "ma2".
 */
__isl_give isl_set *isl_multi_aff_lex_le_set(__isl_take isl_multi_aff *ma1,
  __isl_take isl_multi_aff *ma2)
{
  return isl_multi_aff_lex_ge_set(ma2, ma1);
}
 
/* Return the set of domain elements where "ma1" is lexicographically
 * smaller than "ma2".
 */
__isl_give isl_set *isl_multi_aff_lex_lt_set(__isl_take isl_multi_aff *ma1,
  __isl_take isl_multi_aff *ma2)
{
  return isl_multi_aff_lex_gt_set(ma2, ma1);
}
 
/* Return the set of domain elements where "ma1" is lexicographically
 * greater than to "ma2".  If "equal" is set, then include the domain
 * elements where they are equal.
 * Do this for the case where there are no entries.
 * In this case, "ma1" cannot be greater than "ma2",
 * but it is (greater than or) equal to "ma2".
 */
static __isl_give isl_set *isl_multi_aff_lex_gte_set_0d(
  __isl_take isl_multi_aff *ma1, __isl_take isl_multi_aff *ma2, int equal)
{
  isl_space *space;
 
  space = isl_multi_aff_get_domain_space(ma1);
 
  isl_multi_aff_free(ma1);
  isl_multi_aff_free(ma2);
 
  if (equal)
    return isl_set_universe(space);
  else
    return isl_set_empty(space);
}
 
/* Return the set where entry "i" of "ma1" and "ma2"
 * satisfy the relation prescribed by "cmp".
 */
static __isl_give isl_set *isl_multi_aff_order_at(__isl_keep isl_multi_aff *ma1,
  __isl_keep isl_multi_aff *ma2, int i,
  __isl_give isl_set *(*cmp)(__isl_take isl_aff *aff1,
    __isl_take isl_aff *aff2))
{
  isl_aff *aff1, *aff2;
 
  aff1 = isl_multi_aff_get_at(ma1, i);
  aff2 = isl_multi_aff_get_at(ma2, i);
  return cmp(aff1, aff2);
}
 
/* Return the set of domain elements where "ma1" is lexicographically
 * greater than to "ma2".  If "equal" is set, then include the domain
 * elements where they are equal.
 *
 * In particular, for all but the final entry,
 * include the set of elements where this entry is strictly greater in "ma1"
 * and all previous entries are equal.
 * The final entry is also allowed to be equal in the two functions
 * if "equal" is set.
 *
 * The case where there are no entries is handled separately.
 */
static __isl_give isl_set *isl_multi_aff_lex_gte_set(
  __isl_take isl_multi_aff *ma1, __isl_take isl_multi_aff *ma2, int equal)
{
  int i;
  isl_size n;
  isl_space *space;
  isl_set *res;
  isl_set *equal_set;
  isl_set *gte;
 
  if (isl_multi_aff_check_equal_space(ma1, ma2) < 0)
    goto error;
  n = isl_multi_aff_size(ma1);
  if (n < 0)
    goto error;
  if (n == 0)
    return isl_multi_aff_lex_gte_set_0d(ma1, ma2, equal);
 
  space = isl_multi_aff_get_domain_space(ma1);
  res = isl_set_empty(isl_space_copy(space));
  equal_set = isl_set_universe(space);
 
  for (i = 0; i + 1 < n; ++i) {
    isl_bool empty;
    isl_set *gt, *eq;
 
    gt = isl_multi_aff_order_at(ma1, ma2, i, &isl_aff_gt_set);
    gt = isl_set_intersect(gt, isl_set_copy(equal_set));
    res = isl_set_union(res, gt);
    eq = isl_multi_aff_order_at(ma1, ma2, i, &isl_aff_eq_set);
    equal_set = isl_set_intersect(equal_set, eq);
 
    empty = isl_set_is_empty(equal_set);
    if (empty >= 0 && empty)
      break;
  }
 
  if (equal)
    gte = isl_multi_aff_order_at(ma1, ma2, n - 1, &isl_aff_ge_set);
  else
    gte = isl_multi_aff_order_at(ma1, ma2, n - 1, &isl_aff_gt_set);
  isl_multi_aff_free(ma1);
  isl_multi_aff_free(ma2);
 
  gte = isl_set_intersect(gte, equal_set);
  return isl_set_union(res, gte);
error:
  isl_multi_aff_free(ma1);
  isl_multi_aff_free(ma2);
  return NULL;
}
 
/* Return the set of domain elements where "ma1" is lexicographically
 * greater than or equal to "ma2".
 */
__isl_give isl_set *isl_multi_aff_lex_ge_set(__isl_take isl_multi_aff *ma1,
  __isl_take isl_multi_aff *ma2)
{
  return isl_multi_aff_lex_gte_set(ma1, ma2, 1);
}
 
/* Return the set of domain elements where "ma1" is lexicographically
 * greater than "ma2".
 */
__isl_give isl_set *isl_multi_aff_lex_gt_set(__isl_take isl_multi_aff *ma1,
  __isl_take isl_multi_aff *ma2)
{
  return isl_multi_aff_lex_gte_set(ma1, ma2, 0);
}
 
#define isl_multi_aff_zero_in_space isl_multi_aff_zero
 
#undef PW
#define PW isl_pw_multi_aff
#undef BASE
#define BASE multi_aff
#undef EL_IS_ZERO
#define EL_IS_ZERO is_empty
#undef ZERO
#define ZERO empty
#undef IS_ZERO
#define IS_ZERO is_empty
#undef FIELD
#define FIELD maff
#undef DEFAULT_IS_ZERO
#define DEFAULT_IS_ZERO 0
 
#include <isl_pw_templ.c>
#include <isl_pw_un_op_templ.c>
#include <isl_pw_add_constant_multi_val_templ.c>
#include <isl_pw_add_constant_val_templ.c>
#include <isl_pw_add_disjoint_templ.c>
#include <isl_pw_bind_domain_templ.c>
#include <isl_pw_domain_reverse_templ.c>
#include <isl_pw_fix_templ.c>
#include <isl_pw_from_range_templ.c>
#include <isl_pw_insert_dims_templ.c>
#include <isl_pw_insert_domain_templ.c>
#include <isl_pw_locals_templ.c>
#include <isl_pw_move_dims_templ.c>
#include <isl_pw_neg_templ.c>
#include <isl_pw_pullback_templ.c>
#include <isl_pw_range_tuple_id_templ.c>
#include <isl_pw_union_opt.c>
 
#undef BASE
#define BASE pw_multi_aff
 
#include <isl_union_multi.c>
#include "isl_union_locals_templ.c"
#include <isl_union_neg.c>
#include <isl_union_sub_templ.c>
 
#undef BASE
#define BASE multi_aff
 
#include <isl_union_pw_templ.c>
 
/* Generic function for extracting a factor from a product "pma".
 * "check_space" checks that the space is that of the right kind of product.
 * "space_factor" extracts the factor from the space.
 * "multi_aff_factor" extracts the factor from the constituent functions.
 */
static __isl_give isl_pw_multi_aff *pw_multi_aff_factor(
  __isl_take isl_pw_multi_aff *pma,
  isl_stat (*check_space)(__isl_keep isl_pw_multi_aff *pma),
  __isl_give isl_space *(*space_factor)(__isl_take isl_space *space),
  __isl_give isl_multi_aff *(*multi_aff_factor)(
    __isl_take isl_multi_aff *ma))
{
  int i;
  isl_space *space;
 
  if (check_space(pma) < 0)
    return isl_pw_multi_aff_free(pma);
 
  space = isl_pw_multi_aff_take_space(pma);
  space = space_factor(space);
 
  for (i = 0; pma && i < pma->n; ++i) {
    isl_multi_aff *ma;
 
    ma = isl_pw_multi_aff_take_base_at(pma, i);
    ma = multi_aff_factor(ma);
    pma = isl_pw_multi_aff_restore_base_at(pma, i, ma);
  }
 
  pma = isl_pw_multi_aff_restore_space(pma, space);
 
  return pma;
}
 
/* Is the range of "pma" a wrapped relation?
 */
static isl_bool isl_pw_multi_aff_range_is_wrapping(
  __isl_keep isl_pw_multi_aff *pma)
{
  return isl_space_range_is_wrapping(isl_pw_multi_aff_peek_space(pma));
}
 
/* Check that the range of "pma" is a product.
 */
static isl_stat pw_multi_aff_check_range_product(
  __isl_keep isl_pw_multi_aff *pma)
{
  isl_bool wraps;
 
  wraps = isl_pw_multi_aff_range_is_wrapping(pma);
  if (wraps < 0)
    return isl_stat_error;
  if (!wraps)
    isl_die(isl_pw_multi_aff_get_ctx(pma), isl_error_invalid,
      "range is not a product", return isl_stat_error);
  return isl_stat_ok;
}
 
/* Given a function A -> [B -> C], extract the function A -> B.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_range_factor_domain(
  __isl_take isl_pw_multi_aff *pma)
{
  return pw_multi_aff_factor(pma, &pw_multi_aff_check_range_product,
        &isl_space_range_factor_domain,
        &isl_multi_aff_range_factor_domain);
}
 
/* Given a function A -> [B -> C], extract the function A -> C.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_range_factor_range(
  __isl_take isl_pw_multi_aff *pma)
{
  return pw_multi_aff_factor(pma, &pw_multi_aff_check_range_product,
        &isl_space_range_factor_range,
        &isl_multi_aff_range_factor_range);
}
 
/* Given two piecewise multi affine expressions, return a piecewise
 * multi-affine expression defined on the union of the definition domains
 * of the inputs that is equal to the lexicographic maximum of the two
 * inputs on each cell.  If only one of the two inputs is defined on
 * a given cell, then it is considered to be the maximum.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_union_lexmax(
  __isl_take isl_pw_multi_aff *pma1,
  __isl_take isl_pw_multi_aff *pma2)
{
  isl_pw_multi_aff_align_params_bin(&pma1, &pma2);
  return isl_pw_multi_aff_union_opt_cmp(pma1, pma2,
              &isl_multi_aff_lex_ge_set);
}
 
/* Given two piecewise multi affine expressions, return a piecewise
 * multi-affine expression defined on the union of the definition domains
 * of the inputs that is equal to the lexicographic minimum of the two
 * inputs on each cell.  If only one of the two inputs is defined on
 * a given cell, then it is considered to be the minimum.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_union_lexmin(
  __isl_take isl_pw_multi_aff *pma1,
  __isl_take isl_pw_multi_aff *pma2)
{
  isl_pw_multi_aff_align_params_bin(&pma1, &pma2);
  return isl_pw_multi_aff_union_opt_cmp(pma1, pma2,
              &isl_multi_aff_lex_le_set);
}
 
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_add(
  __isl_take isl_pw_multi_aff *pma1, __isl_take isl_pw_multi_aff *pma2)
{
  isl_pw_multi_aff_align_params_bin(&pma1, &pma2);
  return isl_pw_multi_aff_on_shared_domain(pma1, pma2,
            &isl_multi_aff_add);
}
 
/* Subtract "pma2" from "pma1" and return the result.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_sub(
  __isl_take isl_pw_multi_aff *pma1, __isl_take isl_pw_multi_aff *pma2)
{
  isl_pw_multi_aff_align_params_bin(&pma1, &pma2);
  return isl_pw_multi_aff_on_shared_domain(pma1, pma2,
            &isl_multi_aff_sub);
}
 
/* Given two piecewise multi-affine expressions A -> B and C -> D,
 * construct a piecewise multi-affine expression [A -> C] -> [B -> D].
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_product(
  __isl_take isl_pw_multi_aff *pma1, __isl_take isl_pw_multi_aff *pma2)
{
  int i, j, n;
  isl_space *space;
  isl_pw_multi_aff *res;
 
  if (isl_pw_multi_aff_align_params_bin(&pma1, &pma2) < 0)
    goto error;
 
  n = pma1->n * pma2->n;
  space = isl_space_product(isl_space_copy(pma1->dim),
          isl_space_copy(pma2->dim));
  res = isl_pw_multi_aff_alloc_size(space, n);
 
  for (i = 0; i < pma1->n; ++i) {
    for (j = 0; j < pma2->n; ++j) {
      isl_set *domain;
      isl_multi_aff *ma;
 
      domain = isl_set_product(isl_set_copy(pma1->p[i].set),
             isl_set_copy(pma2->p[j].set));
      ma = isl_multi_aff_product(
          isl_multi_aff_copy(pma1->p[i].maff),
          isl_multi_aff_copy(pma2->p[j].maff));
      res = isl_pw_multi_aff_add_piece(res, domain, ma);
    }
  }
 
  isl_pw_multi_aff_free(pma1);
  isl_pw_multi_aff_free(pma2);
  return res;
error:
  isl_pw_multi_aff_free(pma1);
  isl_pw_multi_aff_free(pma2);
  return NULL;
}
 
/* Subtract the initial "n" elements in "ma" with coefficients in "c" and
 * denominator "denom".
 * "denom" is allowed to be negative, in which case the actual denominator
 * is -denom and the expressions are added instead.
 */
static __isl_give isl_aff *subtract_initial(__isl_take isl_aff *aff,
  __isl_keep isl_multi_aff *ma, int n, isl_int *c, isl_int denom)
{
  int i, first;
  int sign;
  isl_int d;
 
  first = isl_seq_first_non_zero(c, n);
  if (first == -1)
    return aff;
 
  sign = isl_int_sgn(denom);
  isl_int_init(d);
  isl_int_abs(d, denom);
  for (i = first; i < n; ++i) {
    isl_aff *aff_i;
 
    if (isl_int_is_zero(c[i]))
      continue;
    aff_i = isl_multi_aff_get_aff(ma, i);
    aff_i = isl_aff_scale(aff_i, c[i]);
    aff_i = isl_aff_scale_down(aff_i, d);
    if (sign >= 0)
      aff = isl_aff_sub(aff, aff_i);
    else
      aff = isl_aff_add(aff, aff_i);
  }
  isl_int_clear(d);
 
  return aff;
}
 
/* Extract an affine expression that expresses the output dimension "pos"
 * of "bmap" in terms of the parameters and input dimensions from
 * equality "eq".
 * Note that this expression may involve integer divisions defined
 * in terms of parameters and input dimensions.
 * The equality may also involve references to earlier (but not later)
 * output dimensions.  These are replaced by the corresponding elements
 * in "ma".
 *
 * If the equality is of the form
 *
 *  f(i) + h(j) + a x + g(i) = 0,
 *
 * with f(i) a linear combinations of the parameters and input dimensions,
 * g(i) a linear combination of integer divisions defined in terms of the same
 * and h(j) a linear combinations of earlier output dimensions,
 * then the affine expression is
 *
 *  (-f(i) - g(i))/a - h(j)/a
 *
 * If the equality is of the form
 *
 *  f(i) + h(j) - a x + g(i) = 0,
 *
 * then the affine expression is
 *
 *  (f(i) + g(i))/a - h(j)/(-a)
 *
 *
 * If "div" refers to an integer division (i.e., it is smaller than
 * the number of integer divisions), then the equality constraint
 * does involve an integer division (the one at position "div") that
 * is defined in terms of output dimensions.  However, this integer
 * division can be eliminated by exploiting a pair of constraints
 * x >= l and x <= l + n, with n smaller than the coefficient of "div"
 * in the equality constraint.  "ineq" refers to inequality x >= l, i.e.,
 * -l + x >= 0.
 * In particular, let
 *
 *  x = e(i) + m floor(...)
 *
 * with e(i) the expression derived above and floor(...) the integer
 * division involving output dimensions.
 * From
 *
 *  l <= x <= l + n,
 *
 * we have
 *
 *  0 <= x - l <= n
 *
 * This means
 *
 *  e(i) + m floor(...) - l = (e(i) + m floor(...) - l) mod m
 *                          = (e(i) - l) mod m
 *
 * Therefore,
 *
 *  x - l = (e(i) - l) mod m
 *
 * or
 *
 *  x = ((e(i) - l) mod m) + l
 *
 * The variable "shift" below contains the expression -l, which may
 * also involve a linear combination of earlier output dimensions.
 */
static __isl_give isl_aff *extract_aff_from_equality(
  __isl_keep isl_basic_map *bmap, int pos, int eq, int div, int ineq,
  __isl_keep isl_multi_aff *ma)
{
  unsigned o_out;
  isl_size n_div, n_out;
  isl_ctx *ctx;
  isl_local_space *ls;
  isl_aff *aff, *shift;
  isl_val *mod;
 
  ctx = isl_basic_map_get_ctx(bmap);
  ls = isl_basic_map_get_local_space(bmap);
  ls = isl_local_space_domain(ls);
  aff = isl_aff_alloc(isl_local_space_copy(ls));
  if (!aff)
    goto error;
  o_out = isl_basic_map_offset(bmap, isl_dim_out);
  n_out = isl_basic_map_dim(bmap, isl_dim_out);
  n_div = isl_basic_map_dim(bmap, isl_dim_div);
  if (n_out < 0 || n_div < 0)
    goto error;
  if (isl_int_is_neg(bmap->eq[eq][o_out + pos])) {
    isl_seq_cpy(aff->v->el + 1, bmap->eq[eq], o_out);
    isl_seq_cpy(aff->v->el + 1 + o_out,
          bmap->eq[eq] + o_out + n_out, n_div);
  } else {
    isl_seq_neg(aff->v->el + 1, bmap->eq[eq], o_out);
    isl_seq_neg(aff->v->el + 1 + o_out,
          bmap->eq[eq] + o_out + n_out, n_div);
  }
  if (div < n_div)
    isl_int_set_si(aff->v->el[1 + o_out + div], 0);
  isl_int_abs(aff->v->el[0], bmap->eq[eq][o_out + pos]);
  aff = subtract_initial(aff, ma, pos, bmap->eq[eq] + o_out,
          bmap->eq[eq][o_out + pos]);
  if (div < n_div) {
    shift = isl_aff_alloc(isl_local_space_copy(ls));
    if (!shift)
      goto error;
    isl_seq_cpy(shift->v->el + 1, bmap->ineq[ineq], o_out);
    isl_seq_cpy(shift->v->el + 1 + o_out,
          bmap->ineq[ineq] + o_out + n_out, n_div);
    isl_int_set_si(shift->v->el[0], 1);
    shift = subtract_initial(shift, ma, pos,
          bmap->ineq[ineq] + o_out, ctx->negone);
    aff = isl_aff_add(aff, isl_aff_copy(shift));
    mod = isl_val_int_from_isl_int(ctx,
              bmap->eq[eq][o_out + n_out + div]);
    mod = isl_val_abs(mod);
    aff = isl_aff_mod_val(aff, mod);
    aff = isl_aff_sub(aff, shift);
  }
 
  isl_local_space_free(ls);
  return aff;
error:
  isl_local_space_free(ls);
  isl_aff_free(aff);
  return NULL;
}
 
/* Given a basic map with output dimensions defined
 * in terms of the parameters input dimensions and earlier
 * output dimensions using an equality (and possibly a pair on inequalities),
 * extract an isl_aff that expresses output dimension "pos" in terms
 * of the parameters and input dimensions.
 * Note that this expression may involve integer divisions defined
 * in terms of parameters and input dimensions.
 * "ma" contains the expressions corresponding to earlier output dimensions.
 *
 * This function shares some similarities with
 * isl_basic_map_has_defining_equality and isl_constraint_get_bound.
 */
static __isl_give isl_aff *extract_isl_aff_from_basic_map(
  __isl_keep isl_basic_map *bmap, int pos, __isl_keep isl_multi_aff *ma)
{
  int eq, div, ineq;
  isl_aff *aff;
 
  if (!bmap)
    return NULL;
  eq = isl_basic_map_output_defining_equality(bmap, pos, &div, &ineq);
  if (eq >= bmap->n_eq)
    isl_die(isl_basic_map_get_ctx(bmap), isl_error_invalid,
      "unable to find suitable equality", return NULL);
  aff = extract_aff_from_equality(bmap, pos, eq, div, ineq, ma);
 
  aff = isl_aff_remove_unused_divs(aff);
  return aff;
}
 
/* Given a basic map where each output dimension is defined
 * in terms of the parameters and input dimensions using an equality,
 * extract an isl_multi_aff that expresses the output dimensions in terms
 * of the parameters and input dimensions.
 */
static __isl_give isl_multi_aff *extract_isl_multi_aff_from_basic_map(
  __isl_take isl_basic_map *bmap)
{
  int i;
  isl_size n_out;
  isl_multi_aff *ma;
 
  if (!bmap)
    return NULL;
 
  ma = isl_multi_aff_alloc(isl_basic_map_get_space(bmap));
  n_out = isl_basic_map_dim(bmap, isl_dim_out);
  if (n_out < 0)
    ma = isl_multi_aff_free(ma);
 
  for (i = 0; i < n_out; ++i) {
    isl_aff *aff;
 
    aff = extract_isl_aff_from_basic_map(bmap, i, ma);
    ma = isl_multi_aff_set_aff(ma, i, aff);
  }
 
  isl_basic_map_free(bmap);
 
  return ma;
}
 
/* Given a basic set where each set dimension is defined
 * in terms of the parameters using an equality,
 * extract an isl_multi_aff that expresses the set dimensions in terms
 * of the parameters.
 */
__isl_give isl_multi_aff *isl_multi_aff_from_basic_set_equalities(
  __isl_take isl_basic_set *bset)
{
  return extract_isl_multi_aff_from_basic_map(bset);
}
 
/* Create an isl_pw_multi_aff that is equivalent to
 * isl_map_intersect_domain(isl_map_from_basic_map(bmap), domain).
 * The given basic map is such that each output dimension is defined
 * in terms of the parameters and input dimensions using an equality.
 *
 * Since some applications expect the result of isl_pw_multi_aff_from_map
 * to only contain integer affine expressions, we compute the floor
 * of the expression before returning.
 *
 * Remove all constraints involving local variables without
 * an explicit representation (resulting in the removal of those
 * local variables) prior to the actual extraction to ensure
 * that the local spaces in which the resulting affine expressions
 * are created do not contain any unknown local variables.
 * Removing such constraints is safe because constraints involving
 * unknown local variables are not used to determine whether
 * a basic map is obviously single-valued.
 */
static __isl_give isl_pw_multi_aff *plain_pw_multi_aff_from_map(
  __isl_take isl_set *domain, __isl_take isl_basic_map *bmap)
{
  isl_multi_aff *ma;
 
  bmap = isl_basic_map_drop_constraints_involving_unknown_divs(bmap);
  ma = extract_isl_multi_aff_from_basic_map(bmap);
  ma = isl_multi_aff_floor(ma);
  return isl_pw_multi_aff_alloc(domain, ma);
}
 
/* Try and create an isl_pw_multi_aff that is equivalent to the given isl_map.
 * This obviously only works if the input "map" is single-valued.
 * If so, we compute the lexicographic minimum of the image in the form
 * of an isl_pw_multi_aff.  Since the image is unique, it is equal
 * to its lexicographic minimum.
 * If the input is not single-valued, we produce an error.
 */
static __isl_give isl_pw_multi_aff *pw_multi_aff_from_map_base(
  __isl_take isl_map *map)
{
  int i;
  int sv;
  isl_pw_multi_aff *pma;
 
  sv = isl_map_is_single_valued(map);
  if (sv < 0)
    goto error;
  if (!sv)
    isl_die(isl_map_get_ctx(map), isl_error_invalid,
      "map is not single-valued", goto error);
  map = isl_map_make_disjoint(map);
  if (!map)
    return NULL;
 
  pma = isl_pw_multi_aff_empty(isl_map_get_space(map));
 
  for (i = 0; i < map->n; ++i) {
    isl_pw_multi_aff *pma_i;
    isl_basic_map *bmap;
    bmap = isl_basic_map_copy(map->p[i]);
    pma_i = isl_basic_map_lexmin_pw_multi_aff(bmap);
    pma = isl_pw_multi_aff_add_disjoint(pma, pma_i);
  }
 
  isl_map_free(map);
  return pma;
error:
  isl_map_free(map);
  return NULL;
}
 
/* Given an affine expression "aff", return an extended multi-affine expression
 * that also includes an identity on the domain.
 * In other words, the returned expression can be used to extend the domain
 * with an extra dimension corresponding to "aff".
 *
 * That is, if "aff" is of the form
 *
 *  A -> f
 *
 * then return
 *
 *  A -> [A -> f]
 *
 * However, if "aff" is of the form
 *
 *  f
 *
 * i.e., "aff" lives in a set space rather than a map space,
 * then simply return
 *
 *  f
 */
__isl_give isl_multi_aff *isl_aff_as_domain_extension(__isl_take isl_aff *aff)
{
  isl_bool is_set;
  isl_multi_aff *ma;
 
  is_set = isl_space_is_params(isl_aff_peek_domain_space(aff));
  if (is_set < 0)
    return isl_multi_aff_from_aff(isl_aff_free(aff));
 
  if (is_set) {
    ma = isl_multi_aff_from_aff(aff);
  } else {
    isl_space *space;
    isl_multi_aff *id;
 
    space = isl_aff_get_domain_space(aff);
    id = isl_multi_aff_identity(isl_space_map_from_set(space));
    ma = isl_multi_aff_from_aff(aff);
    ma = isl_multi_aff_range_product(id, ma);
  }
 
  return ma;
}
 
/* Try and create an isl_pw_multi_aff that is equivalent to the given isl_map,
 * taking into account that the output dimension at position "d"
 * is equal to some expression f in the parameters and input dimensions
 * represented by "aff".
 *
 * Let "map" be of the form
 *
 *  A -> B
 *
 * Construct a mapping
 *
 *  A -> [A -> x = f]
 *
 * apply that to the map, obtaining
 *
 *  [A -> x = f] -> B
 *
 * and equate dimension "d" to x.
 * An isl_pw_multi_aff representation of this map is then computed and
 * the above expression is plugged in in the result.
 */
static __isl_give isl_pw_multi_aff *pw_multi_aff_from_map_plug_in(
  __isl_take isl_map *map, int d, __isl_take isl_aff *aff)
{
  isl_multi_aff *ma;
  isl_map *insert;
  isl_size n_in;
  isl_pw_multi_aff *pma;
 
  n_in = isl_aff_dim(aff, isl_dim_in);
  if (n_in < 0)
    goto error;
 
  ma = isl_aff_as_domain_extension(aff);
  insert = isl_map_from_multi_aff_internal(isl_multi_aff_copy(ma));
  map = isl_map_apply_domain(map, insert);
  map = isl_map_equate(map, isl_dim_in, n_in, isl_dim_out, d);
  pma = isl_pw_multi_aff_from_map(map);
  pma = isl_pw_multi_aff_pullback_multi_aff(pma, ma);
 
  return pma;
error:
  isl_map_free(map);
  isl_aff_free(aff);
  return NULL;
}
 
/* Try and create an isl_pw_multi_aff that is equivalent to the given isl_map.
 *
 * As a special case, we first check if there is any pair of constraints,
 * shared by all the basic maps in "map" that force a given dimension
 * to be equal to the floor or modulo of some affine combination
 * of the input dimensions.
 *
 * Sort the constraints first to make it easier to find such pairs
 * of constraints.
 */
static __isl_give isl_pw_multi_aff *pw_multi_aff_from_map_check_div_mod(
  __isl_take isl_map *map)
{
  int d;
  isl_basic_map *hull;
  isl_maybe_isl_aff sub;
 
  hull = isl_map_unshifted_simple_hull(isl_map_copy(map));
  hull = isl_basic_map_sort_constraints(hull);
 
  sub = isl_basic_map_try_find_any_output_div_mod(hull, &d);
 
  isl_basic_map_free(hull);
 
  if (sub.valid < 0)
    goto error;
  if (sub.valid)
    return pw_multi_aff_from_map_plug_in(map, d, sub.value);
  return pw_multi_aff_from_map_base(map);
error:
  isl_map_free(map);
  return NULL;
}
 
/* Given an affine expression
 *
 *  [A -> B] -> f(A,B)
 *
 * construct an isl_multi_aff
 *
 *  [A -> B] -> B'
 *
 * such that dimension "d" in B' is set to "aff" and the remaining
 * dimensions are set equal to the corresponding dimensions in B.
 * "n_in" is the dimension of the space A.
 * "n_out" is the dimension of the space B.
 *
 * If "is_set" is set, then the affine expression is of the form
 *
 *  [B] -> f(B)
 *
 * and we construct an isl_multi_aff
 *
 *  B -> B'
 */
static __isl_give isl_multi_aff *range_map(__isl_take isl_aff *aff, int d,
  unsigned n_in, unsigned n_out, int is_set)
{
  int i;
  isl_multi_aff *ma;
  isl_space *space, *space2;
  isl_local_space *ls;
 
  space = isl_aff_get_domain_space(aff);
  ls = isl_local_space_from_space(isl_space_copy(space));
  space2 = isl_space_copy(space);
  if (!is_set)
    space2 = isl_space_range(isl_space_unwrap(space2));
  space = isl_space_map_from_domain_and_range(space, space2);
  ma = isl_multi_aff_alloc(space);
  ma = isl_multi_aff_set_aff(ma, d, aff);
 
  for (i = 0; i < n_out; ++i) {
    if (i == d)
      continue;
    aff = isl_aff_var_on_domain(isl_local_space_copy(ls),
            isl_dim_set, n_in + i);
    ma = isl_multi_aff_set_aff(ma, i, aff);
  }
 
  isl_local_space_free(ls);
 
  return ma;
}
 
/* Try and create an isl_pw_multi_aff that is equivalent to the given isl_map,
 * taking into account that the dimension at position "d" can be written as
 *
 *  x = m a + f(..)           (1)
 *
 * where m is equal to "gcd".
 * "i" is the index of the equality in "hull" that defines f(..).
 * In particular, the equality is of the form
 *
 *  f(..) - x + m g(existentials) = 0
 *
 * or
 *
 *  -f(..) + x + m g(existentials) = 0
 *
 * We basically plug (1) into "map", resulting in a map with "a"
 * in the range instead of "x".  The corresponding isl_pw_multi_aff
 * defining "a" is then plugged back into (1) to obtain a definition for "x".
 *
 * Specifically, given the input map
 *
 *  A -> B
 *
 * We first wrap it into a set
 *
 *  [A -> B]
 *
 * and define (1) on top of the corresponding space, resulting in "aff".
 * We use this to create an isl_multi_aff that maps the output position "d"
 * from "a" to "x", leaving all other (intput and output) dimensions unchanged.
 * We plug this into the wrapped map, unwrap the result and compute the
 * corresponding isl_pw_multi_aff.
 * The result is an expression
 *
 *  A -> T(A)
 *
 * We adjust that to
 *
 *  A -> [A -> T(A)]
 *
 * so that we can plug that into "aff", after extending the latter to
 * a mapping
 *
 *  [A -> B] -> B'
 *
 *
 * If "map" is actually a set, then there is no "A" space, meaning
 * that we do not need to perform any wrapping, and that the result
 * of the recursive call is of the form
 *
 *  [T]
 *
 * which is plugged into a mapping of the form
 *
 *  B -> B'
 */
static __isl_give isl_pw_multi_aff *pw_multi_aff_from_map_stride(
  __isl_take isl_map *map, __isl_take isl_basic_map *hull, int d, int i,
  isl_int gcd)
{
  isl_set *set;
  isl_space *space;
  isl_local_space *ls;
  isl_aff *aff;
  isl_multi_aff *ma;
  isl_pw_multi_aff *pma, *id;
  isl_size n_in;
  unsigned o_out;
  isl_size n_out;
  isl_bool is_set;
 
  is_set = isl_map_is_set(map);
  if (is_set < 0)
    goto error;
 
  n_in = isl_basic_map_dim(hull, isl_dim_in);
  n_out = isl_basic_map_dim(hull, isl_dim_out);
  if (n_in < 0 || n_out < 0)
    goto error;
  o_out = isl_basic_map_offset(hull, isl_dim_out);
 
  if (is_set)
    set = map;
  else
    set = isl_map_wrap(map);
  space = isl_space_map_from_set(isl_set_get_space(set));
  ma = isl_multi_aff_identity(space);
  ls = isl_local_space_from_space(isl_set_get_space(set));
  aff = isl_aff_alloc(ls);
  if (aff) {
    isl_int_set_si(aff->v->el[0], 1);
    if (isl_int_is_one(hull->eq[i][o_out + d]))
      isl_seq_neg(aff->v->el + 1, hull->eq[i],
            aff->v->size - 1);
    else
      isl_seq_cpy(aff->v->el + 1, hull->eq[i],
            aff->v->size - 1);
    isl_int_set(aff->v->el[1 + o_out + d], gcd);
  }
  ma = isl_multi_aff_set_aff(ma, n_in + d, isl_aff_copy(aff));
  set = isl_set_preimage_multi_aff(set, ma);
 
  ma = range_map(aff, d, n_in, n_out, is_set);
 
  if (is_set)
    map = set;
  else
    map = isl_set_unwrap(set);
  pma = isl_pw_multi_aff_from_map(map);
 
  if (!is_set) {
    space = isl_pw_multi_aff_get_domain_space(pma);
    space = isl_space_map_from_set(space);
    id = isl_pw_multi_aff_identity(space);
    pma = isl_pw_multi_aff_range_product(id, pma);
  }
  id = isl_pw_multi_aff_from_multi_aff(ma);
  pma = isl_pw_multi_aff_pullback_pw_multi_aff(id, pma);
 
  isl_basic_map_free(hull);
  return pma;
error:
  isl_map_free(map);
  isl_basic_map_free(hull);
  return NULL;
}
 
/* Try and create an isl_pw_multi_aff that is equivalent to the given isl_map.
 * "hull" contains the equalities valid for "map".
 *
 * Check if any of the output dimensions is "strided".
 * That is, we check if it can be written as
 *
 *  x = m a + f(..)
 *
 * with m greater than 1, a some combination of existentially quantified
 * variables and f an expression in the parameters and input dimensions.
 * If so, we remove the stride in pw_multi_aff_from_map_stride.
 *
 * Otherwise, we continue with pw_multi_aff_from_map_check_div_mod for a further
 * special case.
 */
static __isl_give isl_pw_multi_aff *pw_multi_aff_from_map_check_strides(
  __isl_take isl_map *map, __isl_take isl_basic_map *hull)
{
  int i, j;
  isl_size n_out;
  unsigned o_out;
  isl_size n_div;
  unsigned o_div;
  isl_int gcd;
 
  n_div = isl_basic_map_dim(hull, isl_dim_div);
  n_out = isl_basic_map_dim(hull, isl_dim_out);
  if (n_div < 0 || n_out < 0)
    goto error;
 
  if (n_div == 0) {
    isl_basic_map_free(hull);
    return pw_multi_aff_from_map_check_div_mod(map);
  }
 
  isl_int_init(gcd);
 
  o_div = isl_basic_map_offset(hull, isl_dim_div);
  o_out = isl_basic_map_offset(hull, isl_dim_out);
 
  for (i = 0; i < n_out; ++i) {
    for (j = 0; j < hull->n_eq; ++j) {
      isl_int *eq = hull->eq[j];
      isl_pw_multi_aff *res;
 
      if (!isl_int_is_one(eq[o_out + i]) &&
          !isl_int_is_negone(eq[o_out + i]))
        continue;
      if (isl_seq_any_non_zero(eq + o_out, i))
        continue;
      if (isl_seq_any_non_zero(eq + o_out + i + 1,
                n_out - (i + 1)))
        continue;
      isl_seq_gcd(eq + o_div, n_div, &gcd);
      if (isl_int_is_zero(gcd))
        continue;
      if (isl_int_is_one(gcd))
        continue;
 
      res = pw_multi_aff_from_map_stride(map, hull,
                i, j, gcd);
      isl_int_clear(gcd);
      return res;
    }
  }
 
  isl_int_clear(gcd);
  isl_basic_map_free(hull);
  return pw_multi_aff_from_map_check_div_mod(map);
error:
  isl_map_free(map);
  isl_basic_map_free(hull);
  return NULL;
}
 
/* Try and create an isl_pw_multi_aff that is equivalent to the given isl_map.
 *
 * As a special case, we first check if all output dimensions are uniquely
 * defined in terms of the parameters and input dimensions over the entire
 * domain.  If so, we extract the desired isl_pw_multi_aff directly
 * from the affine hull of "map" and its domain.
 *
 * Otherwise, continue with pw_multi_aff_from_map_check_strides for more
 * special cases.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_from_map(__isl_take isl_map *map)
{
  isl_bool sv;
  isl_size n;
  isl_basic_map *hull;
 
  n = isl_map_n_basic_map(map);
  if (n < 0)
    goto error;
 
  if (n == 1) {
    hull = isl_map_unshifted_simple_hull(isl_map_copy(map));
    hull = isl_basic_map_plain_affine_hull(hull);
    sv = isl_basic_map_plain_is_single_valued(hull);
    if (sv >= 0 && sv)
      return plain_pw_multi_aff_from_map(isl_map_domain(map),
                  hull);
    isl_basic_map_free(hull);
  }
  map = isl_map_detect_equalities(map);
  hull = isl_map_unshifted_simple_hull(isl_map_copy(map));
  sv = isl_basic_map_plain_is_single_valued(hull);
  if (sv >= 0 && sv)
    return plain_pw_multi_aff_from_map(isl_map_domain(map), hull);
  if (sv >= 0)
    return pw_multi_aff_from_map_check_strides(map, hull);
  isl_basic_map_free(hull);
error:
  isl_map_free(map);
  return NULL;
}
 
/* This function performs the same operation as isl_pw_multi_aff_from_map,
 * but is considered as a function on an isl_map when exported.
 */
__isl_give isl_pw_multi_aff *isl_map_as_pw_multi_aff(__isl_take isl_map *map)
{
  return isl_pw_multi_aff_from_map(map);
}
 
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_from_set(__isl_take isl_set *set)
{
  return isl_pw_multi_aff_from_map(set);
}
 
/* This function performs the same operation as isl_pw_multi_aff_from_set,
 * but is considered as a function on an isl_set when exported.
 */
__isl_give isl_pw_multi_aff *isl_set_as_pw_multi_aff(__isl_take isl_set *set)
{
  return isl_pw_multi_aff_from_set(set);
}
 
/* Convert "map" into an isl_pw_multi_aff (if possible) and
 * add it to *user.
 */
static isl_stat pw_multi_aff_from_map(__isl_take isl_map *map, void *user)
{
  isl_union_pw_multi_aff **upma = user;
  isl_pw_multi_aff *pma;
 
  pma = isl_pw_multi_aff_from_map(map);
  *upma = isl_union_pw_multi_aff_add_pw_multi_aff(*upma, pma);
 
  return *upma ? isl_stat_ok : isl_stat_error;
}
 
/* Create an isl_union_pw_multi_aff with the given isl_aff on a universe
 * domain.
 */
__isl_give isl_union_pw_multi_aff *isl_union_pw_multi_aff_from_aff(
  __isl_take isl_aff *aff)
{
  isl_multi_aff *ma;
  isl_pw_multi_aff *pma;
 
  ma = isl_multi_aff_from_aff(aff);
  pma = isl_pw_multi_aff_from_multi_aff(ma);
  return isl_union_pw_multi_aff_from_pw_multi_aff(pma);
}
 
/* Try and create an isl_union_pw_multi_aff that is equivalent
 * to the given isl_union_map.
 * The isl_union_map is required to be single-valued in each space.
 * Otherwise, an error is produced.
 */
__isl_give isl_union_pw_multi_aff *isl_union_pw_multi_aff_from_union_map(
  __isl_take isl_union_map *umap)
{
  isl_space *space;
  isl_union_pw_multi_aff *upma;
 
  space = isl_union_map_get_space(umap);
  upma = isl_union_pw_multi_aff_empty(space);
  if (isl_union_map_foreach_map(umap, &pw_multi_aff_from_map, &upma) < 0)
    upma = isl_union_pw_multi_aff_free(upma);
  isl_union_map_free(umap);
 
  return upma;
}
 
/* This function performs the same operation as
 * isl_union_pw_multi_aff_from_union_map,
 * but is considered as a function on an isl_union_map when exported.
 */
__isl_give isl_union_pw_multi_aff *isl_union_map_as_union_pw_multi_aff(
  __isl_take isl_union_map *umap)
{
  return isl_union_pw_multi_aff_from_union_map(umap);
}
 
/* Try and create an isl_union_pw_multi_aff that is equivalent
 * to the given isl_union_set.
 * The isl_union_set is required to be a singleton in each space.
 * Otherwise, an error is produced.
 */
__isl_give isl_union_pw_multi_aff *isl_union_pw_multi_aff_from_union_set(
  __isl_take isl_union_set *uset)
{
  return isl_union_pw_multi_aff_from_union_map(uset);
}
 
/* Return the piecewise affine expression "set ? 1 : 0".
 */
__isl_give isl_pw_aff *isl_set_indicator_function(__isl_take isl_set *set)
{
  isl_pw_aff *pa;
  isl_space *space = isl_set_get_space(set);
  isl_local_space *ls = isl_local_space_from_space(space);
  isl_aff *zero = isl_aff_zero_on_domain(isl_local_space_copy(ls));
  isl_aff *one = isl_aff_zero_on_domain(ls);
 
  one = isl_aff_add_constant_si(one, 1);
  pa = isl_pw_aff_alloc(isl_set_copy(set), one);
  set = isl_set_complement(set);
  pa = isl_pw_aff_add_disjoint(pa, isl_pw_aff_alloc(set, zero));
 
  return pa;
}
 
/* Plug in "subs" for dimension "type", "pos" of "aff".
 *
 * Let i be the dimension to replace and let "subs" be of the form
 *
 *  f/d
 *
 * and "aff" of the form
 *
 *  (a i + g)/m
 *
 * The result is
 *
 *  (a f + d g')/(m d)
 *
 * where g' is the result of plugging in "subs" in each of the integer
 * divisions in g.
 */
__isl_give isl_aff *isl_aff_substitute(__isl_take isl_aff *aff,
  enum isl_dim_type type, unsigned pos, __isl_keep isl_aff *subs)
{
  isl_ctx *ctx;
  isl_int v;
  isl_size n_div;
 
  aff = isl_aff_cow(aff);
  if (!aff || !subs)
    return isl_aff_free(aff);
 
  ctx = isl_aff_get_ctx(aff);
  if (!isl_space_is_equal(aff->ls->dim, subs->ls->dim))
    isl_die(ctx, isl_error_invalid,
      "spaces don't match", return isl_aff_free(aff));
  n_div = isl_aff_domain_dim(subs, isl_dim_div);
  if (n_div < 0)
    return isl_aff_free(aff);
  if (n_div != 0)
    isl_die(ctx, isl_error_unsupported,
      "cannot handle divs yet", return isl_aff_free(aff));
 
  aff->ls = isl_local_space_substitute(aff->ls, type, pos, subs);
  if (!aff->ls)
    return isl_aff_free(aff);
 
  aff->v = isl_vec_cow(aff->v);
  if (!aff->v)
    return isl_aff_free(aff);
 
  pos += isl_local_space_offset(aff->ls, type);
 
  isl_int_init(v);
  isl_seq_substitute(aff->v->el, pos, subs->v->el,
          aff->v->size, subs->v->size, v);
  isl_int_clear(v);
 
  return aff;
}
 
/* Plug in "subs" for dimension "type", "pos" in each of the affine
 * expressions in "maff".
 */
__isl_give isl_multi_aff *isl_multi_aff_substitute(
  __isl_take isl_multi_aff *maff, enum isl_dim_type type, unsigned pos,
  __isl_keep isl_aff *subs)
{
  isl_size n;
  int i;
 
  n = isl_multi_aff_size(maff);
  if (n < 0 || !subs)
    return isl_multi_aff_free(maff);
 
  if (type == isl_dim_in)
    type = isl_dim_set;
 
  for (i = 0; i < n; ++i) {
    isl_aff *aff;
 
    aff = isl_multi_aff_take_at(maff, i);
    aff = isl_aff_substitute(aff, type, pos, subs);
    maff = isl_multi_aff_restore_at(maff, i, aff);
  }
 
  return maff;
}
 
/* Plug in "subs" for input dimension "pos" of "pma".
 *
 * pma is of the form
 *
 *  A_i(v) -> M_i(v)
 *
 * while subs is of the form
 *
 *  v' = B_j(v) -> S_j
 *
 * Each pair i,j such that C_ij = A_i \cap B_i is non-empty
 * has a contribution in the result, in particular
 *
 *  C_ij(S_j) -> M_i(S_j)
 *
 * Note that plugging in S_j in C_ij may also result in an empty set
 * and this contribution should simply be discarded.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_substitute(
  __isl_take isl_pw_multi_aff *pma, unsigned pos,
  __isl_keep isl_pw_aff *subs)
{
  int i, j, n;
  isl_pw_multi_aff *res;
 
  if (!pma || !subs)
    return isl_pw_multi_aff_free(pma);
 
  n = pma->n * subs->n;
  res = isl_pw_multi_aff_alloc_size(isl_space_copy(pma->dim), n);
 
  for (i = 0; i < pma->n; ++i) {
    for (j = 0; j < subs->n; ++j) {
      isl_set *common;
      isl_multi_aff *res_ij;
      int empty;
 
      common = isl_set_intersect(
          isl_set_copy(pma->p[i].set),
          isl_set_copy(subs->p[j].set));
      common = isl_set_substitute(common,
          pos, subs->p[j].aff);
      empty = isl_set_plain_is_empty(common);
      if (empty < 0 || empty) {
        isl_set_free(common);
        if (empty < 0)
          goto error;
        continue;
      }
 
      res_ij = isl_multi_aff_substitute(
          isl_multi_aff_copy(pma->p[i].maff),
          isl_dim_in, pos, subs->p[j].aff);
 
      res = isl_pw_multi_aff_add_piece(res, common, res_ij);
    }
  }
 
  isl_pw_multi_aff_free(pma);
  return res;
error:
  isl_pw_multi_aff_free(pma);
  isl_pw_multi_aff_free(res);
  return NULL;
}
 
/* Compute the preimage of a range of dimensions in the affine expression "src"
 * under "ma" and put the result in "dst".  The number of dimensions in "src"
 * that precede the range is given by "n_before".  The number of dimensions
 * in the range is given by the number of output dimensions of "ma".
 * The number of dimensions that follow the range is given by "n_after".
 * If "has_denom" is set (to one),
 * then "src" and "dst" have an extra initial denominator.
 * "n_div_ma" is the number of existentials in "ma"
 * "n_div_bset" is the number of existentials in "src"
 * The resulting "dst" (which is assumed to have been allocated by
 * the caller) contains coefficients for both sets of existentials,
 * first those in "ma" and then those in "src".
 * f, c1, c2 and g are temporary objects that have been initialized
 * by the caller.
 *
 * Let src represent the expression
 *
 *  (a(p) + f_u u + b v + f_w w + c(divs))/d
 *
 * and let ma represent the expressions
 *
 *  v_i = (r_i(p) + s_i(y) + t_i(divs'))/m_i
 *
 * We start out with the following expression for dst:
 *
 *  (a(p) + f_u u + 0 y + f_w w + 0 divs' + c(divs) + f \sum_i b_i v_i)/d
 *
 * with the multiplication factor f initially equal to 1
 * and f \sum_i b_i v_i kept separately.
 * For each x_i that we substitute, we multiply the numerator
 * (and denominator) of dst by c_1 = m_i and add the numerator
 * of the x_i expression multiplied by c_2 = f b_i,
 * after removing the common factors of c_1 and c_2.
 * The multiplication factor f also needs to be multiplied by c_1
 * for the next x_j, j > i.
 */
isl_stat isl_seq_preimage(isl_int *dst, isl_int *src,
  __isl_keep isl_multi_aff *ma, int n_before, int n_after,
  int n_div_ma, int n_div_bmap,
  isl_int f, isl_int c1, isl_int c2, isl_int g, int has_denom)
{
  int i;
  isl_size n_param, n_in, n_out;
  int o_dst, o_src;
 
  n_param = isl_multi_aff_dim(ma, isl_dim_param);
  n_in = isl_multi_aff_dim(ma, isl_dim_in);
  n_out = isl_multi_aff_dim(ma, isl_dim_out);
  if (n_param < 0 || n_in < 0 || n_out < 0)
    return isl_stat_error;
 
  isl_seq_cpy(dst, src, has_denom + 1 + n_param + n_before);
  o_dst = o_src = has_denom + 1 + n_param + n_before;
  isl_seq_clr(dst + o_dst, n_in);
  o_dst += n_in;
  o_src += n_out;
  isl_seq_cpy(dst + o_dst, src + o_src, n_after);
  o_dst += n_after;
  o_src += n_after;
  isl_seq_clr(dst + o_dst, n_div_ma);
  o_dst += n_div_ma;
  isl_seq_cpy(dst + o_dst, src + o_src, n_div_bmap);
 
  isl_int_set_si(f, 1);
 
  for (i = 0; i < n_out; ++i) {
    int offset = has_denom + 1 + n_param + n_before + i;
 
    if (isl_int_is_zero(src[offset]))
      continue;
    isl_int_set(c1, ma->u.p[i]->v->el[0]);
    isl_int_mul(c2, f, src[offset]);
    isl_int_gcd(g, c1, c2);
    isl_int_divexact(c1, c1, g);
    isl_int_divexact(c2, c2, g);
 
    isl_int_mul(f, f, c1);
    o_dst = has_denom;
    o_src = 1;
    isl_seq_combine(dst + o_dst, c1, dst + o_dst,
        c2, ma->u.p[i]->v->el + o_src, 1 + n_param);
    o_dst += 1 + n_param;
    o_src += 1 + n_param;
    isl_seq_scale(dst + o_dst, dst + o_dst, c1, n_before);
    o_dst += n_before;
    isl_seq_combine(dst + o_dst, c1, dst + o_dst,
        c2, ma->u.p[i]->v->el + o_src, n_in);
    o_dst += n_in;
    o_src += n_in;
    isl_seq_scale(dst + o_dst, dst + o_dst, c1, n_after);
    o_dst += n_after;
    isl_seq_combine(dst + o_dst, c1, dst + o_dst,
        c2, ma->u.p[i]->v->el + o_src, n_div_ma);
    o_dst += n_div_ma;
    o_src += n_div_ma;
    isl_seq_scale(dst + o_dst, dst + o_dst, c1, n_div_bmap);
    if (has_denom)
      isl_int_mul(dst[0], dst[0], c1);
  }
 
  return isl_stat_ok;
}
 
/* Compute the pullback of "aff" by the function represented by "ma".
 * In other words, plug in "ma" in "aff".  The result is an affine expression
 * defined over the domain space of "ma".
 *
 * If "aff" is represented by
 *
 *  (a(p) + b x + c(divs))/d
 *
 * and ma is represented by
 *
 *  x = D(p) + F(y) + G(divs')
 *
 * then the result is
 *
 *  (a(p) + b D(p) + b F(y) + b G(divs') + c(divs))/d
 *
 * The divs in the local space of the input are similarly adjusted
 * through a call to isl_local_space_preimage_multi_aff.
 */
__isl_give isl_aff *isl_aff_pullback_multi_aff(__isl_take isl_aff *aff,
  __isl_take isl_multi_aff *ma)
{
  isl_aff *res = NULL;
  isl_local_space *ls;
  isl_size n_div_aff, n_div_ma;
  isl_int f, c1, c2, g;
 
  ma = isl_multi_aff_align_divs(ma);
  if (!aff || !ma)
    goto error;
 
  n_div_aff = isl_aff_dim(aff, isl_dim_div);
  n_div_ma = ma->n ? isl_aff_dim(ma->u.p[0], isl_dim_div) : 0;
  if (n_div_aff < 0 || n_div_ma < 0)
    goto error;
 
  ls = isl_aff_get_domain_local_space(aff);
  ls = isl_local_space_preimage_multi_aff(ls, isl_multi_aff_copy(ma));
  res = isl_aff_alloc(ls);
  if (!res)
    goto error;
 
  isl_int_init(f);
  isl_int_init(c1);
  isl_int_init(c2);
  isl_int_init(g);
 
  if (isl_seq_preimage(res->v->el, aff->v->el, ma, 0, 0,
          n_div_ma, n_div_aff, f, c1, c2, g, 1) < 0)
    res = isl_aff_free(res);
 
  isl_int_clear(f);
  isl_int_clear(c1);
  isl_int_clear(c2);
  isl_int_clear(g);
 
  isl_aff_free(aff);
  isl_multi_aff_free(ma);
  res = isl_aff_normalize(res);
  return res;
error:
  isl_aff_free(aff);
  isl_multi_aff_free(ma);
  isl_aff_free(res);
  return NULL;
}
 
/* Compute the pullback of "aff1" by the function represented by "aff2".
 * In other words, plug in "aff2" in "aff1".  The result is an affine expression
 * defined over the domain space of "aff1".
 *
 * The domain of "aff1" should match the range of "aff2", which means
 * that it should be single-dimensional.
 */
__isl_give isl_aff *isl_aff_pullback_aff(__isl_take isl_aff *aff1,
  __isl_take isl_aff *aff2)
{
  isl_multi_aff *ma;
 
  ma = isl_multi_aff_from_aff(aff2);
  return isl_aff_pullback_multi_aff(aff1, ma);
}
 
/* Compute the pullback of "ma1" by the function represented by "ma2".
 * In other words, plug in "ma2" in "ma1".
 */
__isl_give isl_multi_aff *isl_multi_aff_pullback_multi_aff(
  __isl_take isl_multi_aff *ma1, __isl_take isl_multi_aff *ma2)
{
  int i;
  isl_size n;
  isl_space *space = NULL;
 
  isl_multi_aff_align_params_bin(&ma1, &ma2);
  ma2 = isl_multi_aff_align_divs(ma2);
  n = isl_multi_aff_size(ma1);
  if (n < 0 || !ma2)
    goto error;
 
  space = isl_space_join(isl_multi_aff_get_space(ma2),
        isl_multi_aff_get_space(ma1));
 
  for (i = 0; i < n; ++i) {
    isl_aff *aff;
 
    aff = isl_multi_aff_take_at(ma1, i);
    aff = isl_aff_pullback_multi_aff(aff, isl_multi_aff_copy(ma2));
    ma1 = isl_multi_aff_restore_at(ma1, i, aff);
  }
 
  ma1 = isl_multi_aff_reset_space(ma1, space);
  isl_multi_aff_free(ma2);
  return ma1;
error:
  isl_space_free(space);
  isl_multi_aff_free(ma2);
  isl_multi_aff_free(ma1);
  return NULL;
}
 
/* Extend the local space of "dst" to include the divs
 * in the local space of "src".
 *
 * If "src" does not have any divs or if the local spaces of "dst" and
 * "src" are the same, then no extension is required.
 */
__isl_give isl_aff *isl_aff_align_divs(__isl_take isl_aff *dst,
  __isl_keep isl_aff *src)
{
  isl_ctx *ctx;
  isl_size src_n_div, dst_n_div;
  int *exp1 = NULL;
  int *exp2 = NULL;
  isl_bool equal;
  isl_mat *div;
 
  if (!src || !dst)
    return isl_aff_free(dst);
 
  ctx = isl_aff_get_ctx(src);
  equal = isl_local_space_has_equal_space(src->ls, dst->ls);
  if (equal < 0)
    return isl_aff_free(dst);
  if (!equal)
    isl_die(ctx, isl_error_invalid,
      "spaces don't match", goto error);
 
  src_n_div = isl_aff_domain_dim(src, isl_dim_div);
  dst_n_div = isl_aff_domain_dim(dst, isl_dim_div);
  if (src_n_div == 0)
    return dst;
  equal = isl_local_space_is_equal(src->ls, dst->ls);
  if (equal < 0 || src_n_div < 0 || dst_n_div < 0)
    return isl_aff_free(dst);
  if (equal)
    return dst;
 
  exp1 = isl_alloc_array(ctx, int, src_n_div);
  exp2 = isl_alloc_array(ctx, int, dst_n_div);
  if (!exp1 || (dst_n_div && !exp2))
    goto error;
 
  div = isl_merge_divs(src->ls->div, dst->ls->div, exp1, exp2);
  dst = isl_aff_expand_divs(dst, div, exp2);
  free(exp1);
  free(exp2);
 
  return dst;
error:
  free(exp1);
  free(exp2);
  return isl_aff_free(dst);
}
 
/* Adjust the local spaces of the affine expressions in "maff"
 * such that they all have the save divs.
 */
__isl_give isl_multi_aff *isl_multi_aff_align_divs(
  __isl_take isl_multi_aff *maff)
{
  isl_aff *aff_0;
  isl_size n;
  int i;
 
  n = isl_multi_aff_size(maff);
  if (n < 0)
    return isl_multi_aff_free(maff);
  if (n <= 1)
    return maff;
 
  aff_0 = isl_multi_aff_take_at(maff, 0);
  for (i = 1; i < n; ++i) {
    isl_aff *aff_i;
 
    aff_i = isl_multi_aff_peek_at(maff, i);
    aff_0 = isl_aff_align_divs(aff_0, aff_i);
  }
  maff = isl_multi_aff_restore_at(maff, 0, aff_0);
 
  aff_0 = isl_multi_aff_peek_at(maff, 0);
  for (i = 1; i < n; ++i) {
    isl_aff *aff_i;
 
    aff_i = isl_multi_aff_take_at(maff, i);
    aff_i = isl_aff_align_divs(aff_i, aff_0);
    maff = isl_multi_aff_restore_at(maff, i, aff_i);
  }
 
  return maff;
}
 
__isl_give isl_aff *isl_aff_lift(__isl_take isl_aff *aff)
{
  aff = isl_aff_cow(aff);
  if (!aff)
    return NULL;
 
  aff->ls = isl_local_space_lift(aff->ls);
  if (!aff->ls)
    return isl_aff_free(aff);
 
  return aff;
}
 
/* Lift "maff" to a space with extra dimensions such that the result
 * has no more existentially quantified variables.
 * If "ls" is not NULL, then *ls is assigned the local space that lies
 * at the basis of the lifting applied to "maff".
 */
__isl_give isl_multi_aff *isl_multi_aff_lift(__isl_take isl_multi_aff *maff,
  __isl_give isl_local_space **ls)
{
  int i;
  isl_space *space;
  isl_aff *aff;
  isl_size n, n_div;
 
  if (ls)
    *ls = NULL;
 
  n = isl_multi_aff_size(maff);
  if (n < 0)
    return isl_multi_aff_free(maff);
 
  if (n == 0) {
    if (ls) {
      isl_space *space = isl_multi_aff_get_domain_space(maff);
      *ls = isl_local_space_from_space(space);
      if (!*ls)
        return isl_multi_aff_free(maff);
    }
    return maff;
  }
 
  maff = isl_multi_aff_align_divs(maff);
 
  aff = isl_multi_aff_peek_at(maff, 0);
  n_div = isl_aff_dim(aff, isl_dim_div);
  if (n_div < 0)
    return isl_multi_aff_free(maff);
  space = isl_multi_aff_get_space(maff);
  space = isl_space_lift(isl_space_domain(space), n_div);
  space = isl_space_extend_domain_with_range(space,
            isl_multi_aff_get_space(maff));
  maff = isl_multi_aff_restore_space(maff, space);
 
  if (ls) {
    aff = isl_multi_aff_peek_at(maff, 0);
    *ls = isl_aff_get_domain_local_space(aff);
    if (!*ls)
      return isl_multi_aff_free(maff);
  }
 
  for (i = 0; i < n; ++i) {
    aff = isl_multi_aff_take_at(maff, i);
    aff = isl_aff_lift(aff);
    maff = isl_multi_aff_restore_at(maff, i, aff);
  }
 
  return maff;
}
 
#undef TYPE
#define TYPE  isl_pw_multi_aff
static
#include "check_type_range_templ.c"
 
/* Extract an isl_pw_aff corresponding to output dimension "pos" of "pma".
 */
__isl_give isl_pw_aff *isl_pw_multi_aff_get_at(
  __isl_keep isl_pw_multi_aff *pma, int pos)
{
  int i;
  isl_size n_out;
  isl_space *space;
  isl_pw_aff *pa;
 
  if (isl_pw_multi_aff_check_range(pma, isl_dim_out, pos, 1) < 0)
    return NULL;
 
  n_out = isl_pw_multi_aff_dim(pma, isl_dim_out);
  if (n_out < 0)
    return NULL;
 
  space = isl_pw_multi_aff_get_space(pma);
  space = isl_space_drop_dims(space, isl_dim_out,
            pos + 1, n_out - pos - 1);
  space = isl_space_drop_dims(space, isl_dim_out, 0, pos);
 
  pa = isl_pw_aff_alloc_size(space, pma->n);
  for (i = 0; i < pma->n; ++i) {
    isl_aff *aff;
    aff = isl_multi_aff_get_aff(pma->p[i].maff, pos);
    pa = isl_pw_aff_add_piece(pa, isl_set_copy(pma->p[i].set), aff);
  }
 
  return pa;
}
 
/* This is an alternative name for the function above.
 */
__isl_give isl_pw_aff *isl_pw_multi_aff_get_pw_aff(
  __isl_keep isl_pw_multi_aff *pma, int pos)
{
  return isl_pw_multi_aff_get_at(pma, pos);
}
 
/* Return an isl_pw_multi_aff with the given "set" as domain and
 * an unnamed zero-dimensional range.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_from_domain(
  __isl_take isl_set *set)
{
  isl_multi_aff *ma;
  isl_space *space;
 
  space = isl_set_get_space(set);
  space = isl_space_from_domain(space);
  ma = isl_multi_aff_zero(space);
  return isl_pw_multi_aff_alloc(set, ma);
}
 
/* Add an isl_pw_multi_aff with the given "set" as domain and
 * an unnamed zero-dimensional range to *user.
 */
static isl_stat add_pw_multi_aff_from_domain(__isl_take isl_set *set,
  void *user)
{
  isl_union_pw_multi_aff **upma = user;
  isl_pw_multi_aff *pma;
 
  pma = isl_pw_multi_aff_from_domain(set);
  *upma = isl_union_pw_multi_aff_add_pw_multi_aff(*upma, pma);
 
  return isl_stat_ok;
}
 
/* Return an isl_union_pw_multi_aff with the given "uset" as domain and
 * an unnamed zero-dimensional range.
 */
__isl_give isl_union_pw_multi_aff *isl_union_pw_multi_aff_from_domain(
  __isl_take isl_union_set *uset)
{
  isl_space *space;
  isl_union_pw_multi_aff *upma;
 
  if (!uset)
    return NULL;
 
  space = isl_union_set_get_space(uset);
  upma = isl_union_pw_multi_aff_empty(space);
 
  if (isl_union_set_foreach_set(uset,
            &add_pw_multi_aff_from_domain, &upma) < 0)
    goto error;
 
  isl_union_set_free(uset);
  return upma;
error:
  isl_union_set_free(uset);
  isl_union_pw_multi_aff_free(upma);
  return NULL;
}
 
/* Local data for bin_entry and the callback "fn".
 */
struct isl_union_pw_multi_aff_bin_data {
  isl_union_pw_multi_aff *upma2;
  isl_union_pw_multi_aff *res;
  isl_pw_multi_aff *pma;
  isl_stat (*fn)(__isl_take isl_pw_multi_aff *pma, void *user);
};
 
/* Given an isl_pw_multi_aff from upma1, store it in data->pma
 * and call data->fn for each isl_pw_multi_aff in data->upma2.
 */
static isl_stat bin_entry(__isl_take isl_pw_multi_aff *pma, void *user)
{
  struct isl_union_pw_multi_aff_bin_data *data = user;
  isl_stat r;
 
  data->pma = pma;
  r = isl_union_pw_multi_aff_foreach_pw_multi_aff(data->upma2,
           data->fn, data);
  isl_pw_multi_aff_free(pma);
 
  return r;
}
 
/* Call "fn" on each pair of isl_pw_multi_affs in "upma1" and "upma2".
 * The isl_pw_multi_aff from upma1 is stored in data->pma (where data is
 * passed as user field) and the isl_pw_multi_aff from upma2 is available
 * as *entry.  The callback should adjust data->res if desired.
 */
static __isl_give isl_union_pw_multi_aff *bin_op(
  __isl_take isl_union_pw_multi_aff *upma1,
  __isl_take isl_union_pw_multi_aff *upma2,
  isl_stat (*fn)(__isl_take isl_pw_multi_aff *pma, void *user))
{
  isl_space *space;
  struct isl_union_pw_multi_aff_bin_data data = { NULL, NULL, NULL, fn };
 
  space = isl_union_pw_multi_aff_get_space(upma2);
  upma1 = isl_union_pw_multi_aff_align_params(upma1, space);
  space = isl_union_pw_multi_aff_get_space(upma1);
  upma2 = isl_union_pw_multi_aff_align_params(upma2, space);
 
  if (!upma1 || !upma2)
    goto error;
 
  data.upma2 = upma2;
  data.res = isl_union_pw_multi_aff_alloc_same_size(upma1);
  if (isl_union_pw_multi_aff_foreach_pw_multi_aff(upma1,
           &bin_entry, &data) < 0)
    goto error;
 
  isl_union_pw_multi_aff_free(upma1);
  isl_union_pw_multi_aff_free(upma2);
  return data.res;
error:
  isl_union_pw_multi_aff_free(upma1);
  isl_union_pw_multi_aff_free(upma2);
  isl_union_pw_multi_aff_free(data.res);
  return NULL;
}
 
/* Given two isl_pw_multi_affs A -> B and C -> D,
 * construct an isl_pw_multi_aff (A * C) -> [B -> D].
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_range_product(
  __isl_take isl_pw_multi_aff *pma1, __isl_take isl_pw_multi_aff *pma2)
{
  isl_space *space;
 
  isl_pw_multi_aff_align_params_bin(&pma1, &pma2);
  space = isl_space_range_product(isl_pw_multi_aff_get_space(pma1),
          isl_pw_multi_aff_get_space(pma2));
  return isl_pw_multi_aff_on_shared_domain_in(pma1, pma2, space,
              &isl_multi_aff_range_product);
}
 
/* Given two isl_pw_multi_affs A -> B and C -> D,
 * construct an isl_pw_multi_aff (A * C) -> (B, D).
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_flat_range_product(
  __isl_take isl_pw_multi_aff *pma1, __isl_take isl_pw_multi_aff *pma2)
{
  isl_space *space;
 
  isl_pw_multi_aff_align_params_bin(&pma1, &pma2);
  space = isl_space_range_product(isl_pw_multi_aff_get_space(pma1),
          isl_pw_multi_aff_get_space(pma2));
  space = isl_space_flatten_range(space);
  return isl_pw_multi_aff_on_shared_domain_in(pma1, pma2, space,
              &isl_multi_aff_flat_range_product);
}
 
/* If data->pma and "pma2" have the same domain space, then use "range_product"
 * to compute some form of range product and add the result to data->res.
 */
static isl_stat gen_range_product_entry(__isl_take isl_pw_multi_aff *pma2,
  __isl_give isl_pw_multi_aff *(*range_product)(
    __isl_take isl_pw_multi_aff *pma1,
    __isl_take isl_pw_multi_aff *pma2),
  void *user)
{
  struct isl_union_pw_multi_aff_bin_data *data = user;
  isl_bool match;
  isl_space *space1, *space2;
 
  space1 = isl_pw_multi_aff_peek_space(data->pma);
  space2 = isl_pw_multi_aff_peek_space(pma2);
  match = isl_space_tuple_is_equal(space1, isl_dim_in,
          space2, isl_dim_in);
  if (match < 0 || !match) {
    isl_pw_multi_aff_free(pma2);
    return match < 0 ? isl_stat_error : isl_stat_ok;
  }
 
  pma2 = range_product(isl_pw_multi_aff_copy(data->pma), pma2);
 
  data->res = isl_union_pw_multi_aff_add_pw_multi_aff(data->res, pma2);
 
  return isl_stat_ok;
}
 
/* If data->pma and "pma2" have the same domain space, then compute
 * their flat range product and add the result to data->res.
 */
static isl_stat flat_range_product_entry(__isl_take isl_pw_multi_aff *pma2,
  void *user)
{
  return gen_range_product_entry(pma2,
        &isl_pw_multi_aff_flat_range_product, user);
}
 
/* Given two isl_union_pw_multi_affs A -> B and C -> D,
 * construct an isl_union_pw_multi_aff (A * C) -> (B, D).
 */
__isl_give isl_union_pw_multi_aff *isl_union_pw_multi_aff_flat_range_product(
  __isl_take isl_union_pw_multi_aff *upma1,
  __isl_take isl_union_pw_multi_aff *upma2)
{
  return bin_op(upma1, upma2, &flat_range_product_entry);
}
 
/* If data->pma and "pma2" have the same domain space, then compute
 * their range product and add the result to data->res.
 */
static isl_stat range_product_entry(__isl_take isl_pw_multi_aff *pma2,
  void *user)
{
  return gen_range_product_entry(pma2,
        &isl_pw_multi_aff_range_product, user);
}
 
/* Given two isl_union_pw_multi_affs A -> B and C -> D,
 * construct an isl_union_pw_multi_aff (A * C) -> [B -> D].
 */
__isl_give isl_union_pw_multi_aff *isl_union_pw_multi_aff_range_product(
  __isl_take isl_union_pw_multi_aff *upma1,
  __isl_take isl_union_pw_multi_aff *upma2)
{
  return bin_op(upma1, upma2, &range_product_entry);
}
 
/* Replace the affine expressions at position "pos" in "pma" by "pa".
 * The parameters are assumed to have been aligned.
 *
 * The implementation essentially performs an isl_pw_*_on_shared_domain,
 * except that it works on two different isl_pw_* types.
 */
static __isl_give isl_pw_multi_aff *pw_multi_aff_set_pw_aff(
  __isl_take isl_pw_multi_aff *pma, unsigned pos,
  __isl_take isl_pw_aff *pa)
{
  int i, j, n;
  isl_pw_multi_aff *res = NULL;
 
  if (!pma || !pa)
    goto error;
 
  if (!isl_space_tuple_is_equal(pma->dim, isl_dim_in,
          pa->dim, isl_dim_in))
    isl_die(isl_pw_multi_aff_get_ctx(pma), isl_error_invalid,
      "domains don't match", goto error);
  if (isl_pw_multi_aff_check_range(pma, isl_dim_out, pos, 1) < 0)
    goto error;
 
  n = pma->n * pa->n;
  res = isl_pw_multi_aff_alloc_size(isl_pw_multi_aff_get_space(pma), n);
 
  for (i = 0; i < pma->n; ++i) {
    for (j = 0; j < pa->n; ++j) {
      isl_set *common;
      isl_multi_aff *res_ij;
      int empty;
 
      common = isl_set_intersect(isl_set_copy(pma->p[i].set),
               isl_set_copy(pa->p[j].set));
      empty = isl_set_plain_is_empty(common);
      if (empty < 0 || empty) {
        isl_set_free(common);
        if (empty < 0)
          goto error;
        continue;
      }
 
      res_ij = isl_multi_aff_set_aff(
          isl_multi_aff_copy(pma->p[i].maff), pos,
          isl_aff_copy(pa->p[j].aff));
      res_ij = isl_multi_aff_gist(res_ij,
          isl_set_copy(common));
 
      res = isl_pw_multi_aff_add_piece(res, common, res_ij);
    }
  }
 
  isl_pw_multi_aff_free(pma);
  isl_pw_aff_free(pa);
  return res;
error:
  isl_pw_multi_aff_free(pma);
  isl_pw_aff_free(pa);
  return isl_pw_multi_aff_free(res);
}
 
/* Replace the affine expressions at position "pos" in "pma" by "pa".
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_set_pw_aff(
  __isl_take isl_pw_multi_aff *pma, unsigned pos,
  __isl_take isl_pw_aff *pa)
{
  isl_bool equal_params;
 
  if (!pma || !pa)
    goto error;
  equal_params = isl_space_has_equal_params(pma->dim, pa->dim);
  if (equal_params < 0)
    goto error;
  if (equal_params)
    return pw_multi_aff_set_pw_aff(pma, pos, pa);
  if (isl_pw_multi_aff_check_named_params(pma) < 0 ||
      isl_pw_aff_check_named_params(pa) < 0)
    goto error;
  pma = isl_pw_multi_aff_align_params(pma, isl_pw_aff_get_space(pa));
  pa = isl_pw_aff_align_params(pa, isl_pw_multi_aff_get_space(pma));
  return pw_multi_aff_set_pw_aff(pma, pos, pa);
error:
  isl_pw_multi_aff_free(pma);
  isl_pw_aff_free(pa);
  return NULL;
}
 
/* Do the parameters of "pa" match those of "space"?
 */
isl_bool isl_pw_aff_matching_params(__isl_keep isl_pw_aff *pa,
  __isl_keep isl_space *space)
{
  isl_space *pa_space;
  isl_bool match;
 
  if (!pa || !space)
    return isl_bool_error;
 
  pa_space = isl_pw_aff_get_space(pa);
 
  match = isl_space_has_equal_params(space, pa_space);
 
  isl_space_free(pa_space);
  return match;
}
 
/* Check that the domain space of "pa" matches "space".
 */
isl_stat isl_pw_aff_check_match_domain_space(__isl_keep isl_pw_aff *pa,
  __isl_keep isl_space *space)
{
  isl_space *pa_space;
  isl_bool match;
 
  if (!pa || !space)
    return isl_stat_error;
 
  pa_space = isl_pw_aff_get_space(pa);
 
  match = isl_space_has_equal_params(space, pa_space);
  if (match < 0)
    goto error;
  if (!match)
    isl_die(isl_pw_aff_get_ctx(pa), isl_error_invalid,
      "parameters don't match", goto error);
  match = isl_space_tuple_is_equal(space, isl_dim_in,
          pa_space, isl_dim_in);
  if (match < 0)
    goto error;
  if (!match)
    isl_die(isl_pw_aff_get_ctx(pa), isl_error_invalid,
      "domains don't match", goto error);
  isl_space_free(pa_space);
  return isl_stat_ok;
error:
  isl_space_free(pa_space);
  return isl_stat_error;
}
 
#undef BASE
#define BASE pw_aff
#undef DOMBASE
#define DOMBASE set
 
#include <isl_multi_explicit_domain.c>
#include <isl_multi_pw_aff_explicit_domain.c>
#include <isl_multi_templ.c>
#include <isl_multi_un_op_templ.c>
#include <isl_multi_bin_val_templ.c>
#include <isl_multi_add_constant_templ.c>
#include <isl_multi_align_set.c>
#include <isl_multi_apply_set_explicit_domain_templ.c>
#include <isl_multi_arith_templ.c>
#include <isl_multi_bind_templ.c>
#include <isl_multi_bind_domain_templ.c>
#include <isl_multi_coalesce.c>
#include <isl_multi_domain_templ.c>
#include <isl_multi_domain_reverse_templ.c>
#include <isl_multi_dim_id_templ.c>
#include <isl_multi_dims.c>
#include <isl_multi_from_base_templ.c>
#include <isl_multi_check_domain_templ.c>
#include <isl_multi_gist.c>
#include <isl_multi_hash.c>
#include <isl_multi_identity_templ.c>
#include <isl_multi_insert_domain_templ.c>
#include <isl_multi_intersect.c>
#include <isl_multi_min_max_templ.c>
#include <isl_multi_move_dims_templ.c>
#include <isl_multi_nan_templ.c>
#include <isl_multi_param_templ.c>
#include <isl_multi_product_templ.c>
#include <isl_multi_splice_templ.c>
#include <isl_multi_tuple_id_templ.c>
#include <isl_multi_union_add_templ.c>
#include <isl_multi_zero_templ.c>
#include <isl_multi_unbind_params_templ.c>
 
/* Is every element of "mpa" defined over a single universe domain?
 */
isl_bool isl_multi_pw_aff_isa_multi_aff(__isl_keep isl_multi_pw_aff *mpa)
{
  return isl_multi_pw_aff_every(mpa, &isl_pw_aff_isa_aff);
}
 
/* Given that every element of "mpa" is defined over a single universe domain,
 * return the corresponding base expressions.
 */
__isl_give isl_multi_aff *isl_multi_pw_aff_as_multi_aff(
  __isl_take isl_multi_pw_aff *mpa)
{
  int i;
  isl_size n;
  isl_multi_aff *ma;
 
  n = isl_multi_pw_aff_size(mpa);
  if (n < 0)
    mpa = isl_multi_pw_aff_free(mpa);
  ma = isl_multi_aff_alloc(isl_multi_pw_aff_get_space(mpa));
  for (i = 0; i < n; ++i) {
    isl_aff *aff;
 
    aff = isl_pw_aff_as_aff(isl_multi_pw_aff_get_at(mpa, i));
    ma = isl_multi_aff_set_aff(ma, i, aff);
  }
  isl_multi_pw_aff_free(mpa);
  return ma;
}
 
/* If "mpa" has an explicit domain, then intersect the domain of "map"
 * with this explicit domain.
 */
__isl_give isl_map *isl_map_intersect_multi_pw_aff_explicit_domain(
  __isl_take isl_map *map, __isl_keep isl_multi_pw_aff *mpa)
{
  isl_set *dom;
 
  if (!isl_multi_pw_aff_has_explicit_domain(mpa))
    return map;
 
  dom = isl_multi_pw_aff_domain(isl_multi_pw_aff_copy(mpa));
  map = isl_map_intersect_domain(map, dom);
 
  return map;
}
 
/* Are all elements of "mpa" piecewise constants?
 */
isl_bool isl_multi_pw_aff_is_cst(__isl_keep isl_multi_pw_aff *mpa)
{
  return isl_multi_pw_aff_every(mpa, &isl_pw_aff_is_cst);
}
 
/* Does "mpa" have a non-trivial explicit domain?
 *
 * The explicit domain, if present, is trivial if it represents
 * an (obviously) universe set.
 */
isl_bool isl_multi_pw_aff_has_non_trivial_domain(
  __isl_keep isl_multi_pw_aff *mpa)
{
  if (!mpa)
    return isl_bool_error;
  if (!isl_multi_pw_aff_has_explicit_domain(mpa))
    return isl_bool_false;
  return isl_bool_not(isl_set_plain_is_universe(mpa->u.dom));
}
 
#undef BASE
#define BASE  set
 
#include "isl_opt_mpa_templ.c"
 
/* Compute the minima of the set dimensions as a function of the
 * parameters, but independently of the other set dimensions.
 */
__isl_give isl_multi_pw_aff *isl_set_min_multi_pw_aff(__isl_take isl_set *set)
{
  return set_opt_mpa(set, &isl_set_dim_min);
}
 
/* Compute the maxima of the set dimensions as a function of the
 * parameters, but independently of the other set dimensions.
 */
__isl_give isl_multi_pw_aff *isl_set_max_multi_pw_aff(__isl_take isl_set *set)
{
  return set_opt_mpa(set, &isl_set_dim_max);
}
 
#undef BASE
#define BASE  map
 
#include "isl_opt_mpa_templ.c"
 
/* Compute the minima of the output dimensions as a function of the
 * parameters and input dimensions, but independently of
 * the other output dimensions.
 */
__isl_give isl_multi_pw_aff *isl_map_min_multi_pw_aff(__isl_take isl_map *map)
{
  return map_opt_mpa(map, &isl_map_dim_min);
}
 
/* Compute the maxima of the output dimensions as a function of the
 * parameters and input dimensions, but independently of
 * the other output dimensions.
 */
__isl_give isl_multi_pw_aff *isl_map_max_multi_pw_aff(__isl_take isl_map *map)
{
  return map_opt_mpa(map, &isl_map_dim_max);
}
 
#undef TYPE
#define TYPE  isl_pw_multi_aff
#include "isl_type_check_match_range_multi_val.c"
 
/* Apply "fn" to the base expressions of "pma" and "mv".
 */
static __isl_give isl_pw_multi_aff *isl_pw_multi_aff_op_multi_val(
  __isl_take isl_pw_multi_aff *pma, __isl_take isl_multi_val *mv,
  __isl_give isl_multi_aff *(*fn)(__isl_take isl_multi_aff *ma,
    __isl_take isl_multi_val *mv))
{
  int i;
  isl_size n;
 
  if (isl_pw_multi_aff_check_match_range_multi_val(pma, mv) < 0)
    goto error;
 
  n = isl_pw_multi_aff_n_piece(pma);
  if (n < 0)
    goto error;
 
  for (i = 0; i < n; ++i) {
    isl_multi_aff *ma;
 
    ma = isl_pw_multi_aff_take_base_at(pma, i);
    ma = fn(ma, isl_multi_val_copy(mv));
    pma = isl_pw_multi_aff_restore_base_at(pma, i, ma);
  }
 
  isl_multi_val_free(mv);
  return pma;
error:
  isl_multi_val_free(mv);
  isl_pw_multi_aff_free(pma);
  return NULL;
}
 
/* Scale the elements of "pma" by the corresponding elements of "mv".
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_scale_multi_val(
  __isl_take isl_pw_multi_aff *pma, __isl_take isl_multi_val *mv)
{
  return isl_pw_multi_aff_op_multi_val(pma, mv,
          &isl_multi_aff_scale_multi_val);
}
 
/* Scale the elements of "pma" down by the corresponding elements of "mv".
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_scale_down_multi_val(
  __isl_take isl_pw_multi_aff *pma, __isl_take isl_multi_val *mv)
{
  return isl_pw_multi_aff_op_multi_val(pma, mv,
          &isl_multi_aff_scale_down_multi_val);
}
 
/* This function is called for each entry of an isl_union_pw_multi_aff.
 * If the space of the entry matches that of data->mv,
 * then apply isl_pw_multi_aff_scale_multi_val and return the result.
 * Otherwise, return an empty isl_pw_multi_aff.
 */
static __isl_give isl_pw_multi_aff *union_pw_multi_aff_scale_multi_val_entry(
  __isl_take isl_pw_multi_aff *pma, void *user)
{
  isl_bool equal;
  isl_multi_val *mv = user;
 
  equal = isl_pw_multi_aff_match_range_multi_val(pma, mv);
  if (equal < 0)
    return isl_pw_multi_aff_free(pma);
  if (!equal) {
    isl_space *space = isl_pw_multi_aff_get_space(pma);
    isl_pw_multi_aff_free(pma);
    return isl_pw_multi_aff_empty(space);
  }
 
  return isl_pw_multi_aff_scale_multi_val(pma, isl_multi_val_copy(mv));
}
 
/* Scale the elements of "upma" by the corresponding elements of "mv",
 * for those entries that match the space of "mv".
 */
__isl_give isl_union_pw_multi_aff *isl_union_pw_multi_aff_scale_multi_val(
  __isl_take isl_union_pw_multi_aff *upma, __isl_take isl_multi_val *mv)
{
  struct isl_union_pw_multi_aff_transform_control control = {
    .fn = &union_pw_multi_aff_scale_multi_val_entry,
    .fn_user = mv,
  };
 
  upma = isl_union_pw_multi_aff_align_params(upma,
            isl_multi_val_get_space(mv));
  mv = isl_multi_val_align_params(mv,
          isl_union_pw_multi_aff_get_space(upma));
  if (!upma || !mv)
    goto error;
 
  return isl_union_pw_multi_aff_transform(upma, &control);
 
  isl_multi_val_free(mv);
  return upma;
error:
  isl_multi_val_free(mv);
  isl_union_pw_multi_aff_free(upma);
  return NULL;
}
 
/* Construct and return a piecewise multi affine expression
 * in the given space with value zero in each of the output dimensions and
 * a universe domain.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_zero(__isl_take isl_space *space)
{
  return isl_pw_multi_aff_from_multi_aff(isl_multi_aff_zero(space));
}
 
/* Construct and return a piecewise multi affine expression
 * that is equal to the given piecewise affine expression.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_from_pw_aff(
  __isl_take isl_pw_aff *pa)
{
  int i;
  isl_space *space;
  isl_pw_multi_aff *pma;
 
  if (!pa)
    return NULL;
 
  space = isl_pw_aff_get_space(pa);
  pma = isl_pw_multi_aff_alloc_size(space, pa->n);
 
  for (i = 0; i < pa->n; ++i) {
    isl_set *set;
    isl_multi_aff *ma;
 
    set = isl_set_copy(pa->p[i].set);
    ma = isl_multi_aff_from_aff(isl_aff_copy(pa->p[i].aff));
    pma = isl_pw_multi_aff_add_piece(pma, set, ma);
  }
 
  isl_pw_aff_free(pa);
  return pma;
}
 
/* Construct and return a piecewise multi affine expression
 * that is equal to the given multi piecewise affine expression
 * on the shared domain of the piecewise affine expressions,
 * in the special case of a 0D multi piecewise affine expression.
 *
 * Create a piecewise multi affine expression with the explicit domain of
 * the 0D multi piecewise affine expression as domain.
 */
static __isl_give isl_pw_multi_aff *isl_pw_multi_aff_from_multi_pw_aff_0D(
  __isl_take isl_multi_pw_aff *mpa)
{
  isl_space *space;
  isl_set *dom;
  isl_multi_aff *ma;
 
  space = isl_multi_pw_aff_get_space(mpa);
  dom = isl_multi_pw_aff_get_explicit_domain(mpa);
  isl_multi_pw_aff_free(mpa);
 
  ma = isl_multi_aff_zero(space);
  return isl_pw_multi_aff_alloc(dom, ma);
}
 
/* Construct and return a piecewise multi affine expression
 * that is equal to the given multi piecewise affine expression
 * on the shared domain of the piecewise affine expressions.
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_from_multi_pw_aff(
  __isl_take isl_multi_pw_aff *mpa)
{
  int i;
  isl_space *space;
  isl_pw_aff *pa;
  isl_pw_multi_aff *pma;
 
  if (!mpa)
    return NULL;
 
  if (mpa->n == 0)
    return isl_pw_multi_aff_from_multi_pw_aff_0D(mpa);
 
  space = isl_multi_pw_aff_get_space(mpa);
  pa = isl_multi_pw_aff_get_pw_aff(mpa, 0);
  pma = isl_pw_multi_aff_from_pw_aff(pa);
 
  for (i = 1; i < mpa->n; ++i) {
    isl_pw_multi_aff *pma_i;
 
    pa = isl_multi_pw_aff_get_pw_aff(mpa, i);
    pma_i = isl_pw_multi_aff_from_pw_aff(pa);
    pma = isl_pw_multi_aff_range_product(pma, pma_i);
  }
 
  pma = isl_pw_multi_aff_reset_space(pma, space);
 
  isl_multi_pw_aff_free(mpa);
  return pma;
}
 
/* Convenience function that constructs an isl_multi_pw_aff
 * directly from an isl_aff.
 */
__isl_give isl_multi_pw_aff *isl_multi_pw_aff_from_aff(__isl_take isl_aff *aff)
{
  return isl_multi_pw_aff_from_pw_aff(isl_pw_aff_from_aff(aff));
}
 
/* Construct and return a multi piecewise affine expression
 * that is equal to the given multi affine expression.
 */
__isl_give isl_multi_pw_aff *isl_multi_pw_aff_from_multi_aff(
  __isl_take isl_multi_aff *ma)
{
  int i;
  isl_size n;
  isl_multi_pw_aff *mpa;
 
  n = isl_multi_aff_dim(ma, isl_dim_out);
  if (n < 0)
    ma = isl_multi_aff_free(ma);
  if (!ma)
    return NULL;
 
  mpa = isl_multi_pw_aff_alloc(isl_multi_aff_get_space(ma));
 
  for (i = 0; i < n; ++i) {
    isl_pw_aff *pa;
 
    pa = isl_pw_aff_from_aff(isl_multi_aff_get_aff(ma, i));
    mpa = isl_multi_pw_aff_set_pw_aff(mpa, i, pa);
  }
 
  isl_multi_aff_free(ma);
  return mpa;
}
 
/* This function performs the same operation as isl_multi_pw_aff_from_multi_aff,
 * but is considered as a function on an isl_multi_aff when exported.
 */
__isl_give isl_multi_pw_aff *isl_multi_aff_to_multi_pw_aff(
  __isl_take isl_multi_aff *ma)
{
  return isl_multi_pw_aff_from_multi_aff(ma);
}
 
/* Construct and return a multi piecewise affine expression
 * that is equal to the given piecewise multi affine expression.
 *
 * If the resulting multi piecewise affine expression has
 * an explicit domain, then assign it the domain of the input.
 * In other cases, the domain is stored in the individual elements.
 */
__isl_give isl_multi_pw_aff *isl_multi_pw_aff_from_pw_multi_aff(
  __isl_take isl_pw_multi_aff *pma)
{
  int i;
  isl_size n;
  isl_space *space;
  isl_multi_pw_aff *mpa;
 
  n = isl_pw_multi_aff_dim(pma, isl_dim_out);
  if (n < 0)
    pma = isl_pw_multi_aff_free(pma);
  space = isl_pw_multi_aff_get_space(pma);
  mpa = isl_multi_pw_aff_alloc(space);
 
  for (i = 0; i < n; ++i) {
    isl_pw_aff *pa;
 
    pa = isl_pw_multi_aff_get_pw_aff(pma, i);
    mpa = isl_multi_pw_aff_set_pw_aff(mpa, i, pa);
  }
  if (isl_multi_pw_aff_has_explicit_domain(mpa)) {
    isl_set *dom;
 
    dom = isl_pw_multi_aff_domain(isl_pw_multi_aff_copy(pma));
    mpa = isl_multi_pw_aff_intersect_domain(mpa, dom);
  }
 
  isl_pw_multi_aff_free(pma);
  return mpa;
}
 
/* This function performs the same operation as
 * isl_multi_pw_aff_from_pw_multi_aff,
 * but is considered as a function on an isl_pw_multi_aff when exported.
 */
__isl_give isl_multi_pw_aff *isl_pw_multi_aff_to_multi_pw_aff(
  __isl_take isl_pw_multi_aff *pma)
{
  return isl_multi_pw_aff_from_pw_multi_aff(pma);
}
 
/* Do "pa1" and "pa2" represent the same function?
 *
 * We first check if they are obviously equal.
 * If not, we convert them to maps and check if those are equal.
 *
 * If "pa1" or "pa2" contain any NaNs, then they are considered
 * not to be the same.  A NaN is not equal to anything, not even
 * to another NaN.
 */
isl_bool isl_pw_aff_is_equal(__isl_keep isl_pw_aff *pa1,
  __isl_keep isl_pw_aff *pa2)
{
  isl_bool equal;
  isl_bool has_nan;
  isl_map *map1, *map2;
 
  if (!pa1 || !pa2)
    return isl_bool_error;
 
  equal = isl_pw_aff_plain_is_equal(pa1, pa2);
  if (equal < 0 || equal)
    return equal;
  has_nan = either_involves_nan(pa1, pa2);
  if (has_nan < 0)
    return isl_bool_error;
  if (has_nan)
    return isl_bool_false;
 
  map1 = isl_map_from_pw_aff_internal(isl_pw_aff_copy(pa1));
  map2 = isl_map_from_pw_aff_internal(isl_pw_aff_copy(pa2));
  equal = isl_map_is_equal(map1, map2);
  isl_map_free(map1);
  isl_map_free(map2);
 
  return equal;
}
 
/* Do "mpa1" and "mpa2" represent the same function?
 *
 * Note that we cannot convert the entire isl_multi_pw_aff
 * to a map because the domains of the piecewise affine expressions
 * may not be the same.
 */
isl_bool isl_multi_pw_aff_is_equal(__isl_keep isl_multi_pw_aff *mpa1,
  __isl_keep isl_multi_pw_aff *mpa2)
{
  int i;
  isl_bool equal, equal_params;
 
  if (!mpa1 || !mpa2)
    return isl_bool_error;
 
  equal_params = isl_space_has_equal_params(mpa1->space, mpa2->space);
  if (equal_params < 0)
    return isl_bool_error;
  if (!equal_params) {
    if (!isl_space_has_named_params(mpa1->space))
      return isl_bool_false;
    if (!isl_space_has_named_params(mpa2->space))
      return isl_bool_false;
    mpa1 = isl_multi_pw_aff_copy(mpa1);
    mpa2 = isl_multi_pw_aff_copy(mpa2);
    mpa1 = isl_multi_pw_aff_align_params(mpa1,
              isl_multi_pw_aff_get_space(mpa2));
    mpa2 = isl_multi_pw_aff_align_params(mpa2,
              isl_multi_pw_aff_get_space(mpa1));
    equal = isl_multi_pw_aff_is_equal(mpa1, mpa2);
    isl_multi_pw_aff_free(mpa1);
    isl_multi_pw_aff_free(mpa2);
    return equal;
  }
 
  equal = isl_space_is_equal(mpa1->space, mpa2->space);
  if (equal < 0 || !equal)
    return equal;
 
  for (i = 0; i < mpa1->n; ++i) {
    equal = isl_pw_aff_is_equal(mpa1->u.p[i], mpa2->u.p[i]);
    if (equal < 0 || !equal)
      return equal;
  }
 
  return isl_bool_true;
}
 
/* Do "pma1" and "pma2" represent the same function?
 *
 * First check if they are obviously equal.
 * If not, then convert them to maps and check if those are equal.
 *
 * If "pa1" or "pa2" contain any NaNs, then they are considered
 * not to be the same.  A NaN is not equal to anything, not even
 * to another NaN.
 */
isl_bool isl_pw_multi_aff_is_equal(__isl_keep isl_pw_multi_aff *pma1,
  __isl_keep isl_pw_multi_aff *pma2)
{
  isl_bool equal;
  isl_bool has_nan;
  isl_map *map1, *map2;
 
  if (!pma1 || !pma2)
    return isl_bool_error;
 
  equal = isl_pw_multi_aff_plain_is_equal(pma1, pma2);
  if (equal < 0 || equal)
    return equal;
  has_nan = isl_pw_multi_aff_involves_nan(pma1);
  if (has_nan >= 0 && !has_nan)
    has_nan = isl_pw_multi_aff_involves_nan(pma2);
  if (has_nan < 0 || has_nan)
    return isl_bool_not(has_nan);
 
  map1 = isl_map_from_pw_multi_aff_internal(isl_pw_multi_aff_copy(pma1));
  map2 = isl_map_from_pw_multi_aff_internal(isl_pw_multi_aff_copy(pma2));
  equal = isl_map_is_equal(map1, map2);
  isl_map_free(map1);
  isl_map_free(map2);
 
  return equal;
}
 
#undef BASE
#define BASE  multi_aff
 
#include "isl_multi_pw_aff_pullback_templ.c"
 
#undef BASE
#define BASE  pw_multi_aff
 
#include "isl_multi_pw_aff_pullback_templ.c"
 
/* Apply "aff" to "mpa".  The range of "mpa" needs to be compatible
 * with the domain of "aff".  The domain of the result is the same
 * as that of "mpa".
 * "mpa" and "aff" are assumed to have been aligned.
 *
 * We first extract the parametric constant from "aff", defined
 * over the correct domain.
 * Then we add the appropriate combinations of the members of "mpa".
 * Finally, we add the integer divisions through recursive calls.
 */
static __isl_give isl_pw_aff *isl_multi_pw_aff_apply_aff_aligned(
  __isl_take isl_multi_pw_aff *mpa, __isl_take isl_aff *aff)
{
  int i;
  isl_size n_in, n_div, n_mpa_in;
  isl_space *space;
  isl_val *v;
  isl_pw_aff *pa;
  isl_aff *tmp;
 
  n_in = isl_aff_dim(aff, isl_dim_in);
  n_div = isl_aff_dim(aff, isl_dim_div);
  n_mpa_in = isl_multi_pw_aff_dim(mpa, isl_dim_in);
  if (n_in < 0 || n_div < 0 || n_mpa_in < 0)
    goto error;
 
  space = isl_space_domain(isl_multi_pw_aff_get_space(mpa));
  tmp = isl_aff_copy(aff);
  tmp = isl_aff_drop_dims(tmp, isl_dim_div, 0, n_div);
  tmp = isl_aff_drop_dims(tmp, isl_dim_in, 0, n_in);
  tmp = isl_aff_add_dims(tmp, isl_dim_in, n_mpa_in);
  tmp = isl_aff_reset_domain_space(tmp, space);
  pa = isl_pw_aff_from_aff(tmp);
 
  for (i = 0; i < n_in; ++i) {
    isl_pw_aff *pa_i;
 
    if (!isl_aff_involves_dims(aff, isl_dim_in, i, 1))
      continue;
    v = isl_aff_get_coefficient_val(aff, isl_dim_in, i);
    pa_i = isl_multi_pw_aff_get_pw_aff(mpa, i);
    pa_i = isl_pw_aff_scale_val(pa_i, v);
    pa = isl_pw_aff_add(pa, pa_i);
  }
 
  for (i = 0; i < n_div; ++i) {
    isl_aff *div;
    isl_pw_aff *pa_i;
 
    if (!isl_aff_involves_dims(aff, isl_dim_div, i, 1))
      continue;
    div = isl_aff_get_div(aff, i);
    pa_i = isl_multi_pw_aff_apply_aff_aligned(
              isl_multi_pw_aff_copy(mpa), div);
    pa_i = isl_pw_aff_floor(pa_i);
    v = isl_aff_get_coefficient_val(aff, isl_dim_div, i);
    pa_i = isl_pw_aff_scale_val(pa_i, v);
    pa = isl_pw_aff_add(pa, pa_i);
  }
 
  isl_multi_pw_aff_free(mpa);
  isl_aff_free(aff);
 
  return pa;
error:
  isl_multi_pw_aff_free(mpa);
  isl_aff_free(aff);
  return NULL;
}
 
/* Apply "aff" to "mpa".  The range of "mpa" needs to be compatible
 * with the domain of "aff".  The domain of the result is the same
 * as that of "mpa".
 */
__isl_give isl_pw_aff *isl_multi_pw_aff_apply_aff(
  __isl_take isl_multi_pw_aff *mpa, __isl_take isl_aff *aff)
{
  isl_bool equal_params;
 
  if (!aff || !mpa)
    goto error;
  equal_params = isl_space_has_equal_params(aff->ls->dim, mpa->space);
  if (equal_params < 0)
    goto error;
  if (equal_params)
    return isl_multi_pw_aff_apply_aff_aligned(mpa, aff);
 
  aff = isl_aff_align_params(aff, isl_multi_pw_aff_get_space(mpa));
  mpa = isl_multi_pw_aff_align_params(mpa, isl_aff_get_space(aff));
 
  return isl_multi_pw_aff_apply_aff_aligned(mpa, aff);
error:
  isl_aff_free(aff);
  isl_multi_pw_aff_free(mpa);
  return NULL;
}
 
/* Apply "pa" to "mpa".  The range of "mpa" needs to be compatible
 * with the domain of "pa".  The domain of the result is the same
 * as that of "mpa".
 * "mpa" and "pa" are assumed to have been aligned.
 *
 * We consider each piece in turn.  Note that the domains of the
 * pieces are assumed to be disjoint and they remain disjoint
 * after taking the preimage (over the same function).
 */
static __isl_give isl_pw_aff *isl_multi_pw_aff_apply_pw_aff_aligned(
  __isl_take isl_multi_pw_aff *mpa, __isl_take isl_pw_aff *pa)
{
  isl_space *space;
  isl_pw_aff *res;
  int i;
 
  if (!mpa || !pa)
    goto error;
 
  space = isl_space_join(isl_multi_pw_aff_get_space(mpa),
        isl_pw_aff_get_space(pa));
  res = isl_pw_aff_empty(space);
 
  for (i = 0; i < pa->n; ++i) {
    isl_pw_aff *pa_i;
    isl_set *domain;
 
    pa_i = isl_multi_pw_aff_apply_aff_aligned(
          isl_multi_pw_aff_copy(mpa),
          isl_aff_copy(pa->p[i].aff));
    domain = isl_set_copy(pa->p[i].set);
    domain = isl_set_preimage_multi_pw_aff(domain,
          isl_multi_pw_aff_copy(mpa));
    pa_i = isl_pw_aff_intersect_domain(pa_i, domain);
    res = isl_pw_aff_add_disjoint(res, pa_i);
  }
 
  isl_pw_aff_free(pa);
  isl_multi_pw_aff_free(mpa);
  return res;
error:
  isl_pw_aff_free(pa);
  isl_multi_pw_aff_free(mpa);
  return NULL;
}
 
/* Apply "pa" to "mpa".  The range of "mpa" needs to be compatible
 * with the domain of "pa".  The domain of the result is the same
 * as that of "mpa".
 */
__isl_give isl_pw_aff *isl_multi_pw_aff_apply_pw_aff(
  __isl_take isl_multi_pw_aff *mpa, __isl_take isl_pw_aff *pa)
{
  isl_bool equal_params;
 
  if (!pa || !mpa)
    goto error;
  equal_params = isl_space_has_equal_params(pa->dim, mpa->space);
  if (equal_params < 0)
    goto error;
  if (equal_params)
    return isl_multi_pw_aff_apply_pw_aff_aligned(mpa, pa);
 
  pa = isl_pw_aff_align_params(pa, isl_multi_pw_aff_get_space(mpa));
  mpa = isl_multi_pw_aff_align_params(mpa, isl_pw_aff_get_space(pa));
 
  return isl_multi_pw_aff_apply_pw_aff_aligned(mpa, pa);
error:
  isl_pw_aff_free(pa);
  isl_multi_pw_aff_free(mpa);
  return NULL;
}
 
/* Compute the pullback of "pa" by the function represented by "mpa".
 * In other words, plug in "mpa" in "pa".
 *
 * The pullback is computed by applying "pa" to "mpa".
 */
__isl_give isl_pw_aff *isl_pw_aff_pullback_multi_pw_aff(
  __isl_take isl_pw_aff *pa, __isl_take isl_multi_pw_aff *mpa)
{
  return isl_multi_pw_aff_apply_pw_aff(mpa, pa);
}
 
#undef BASE
#define BASE  multi_pw_aff
 
#include "isl_multi_pw_aff_pullback_templ.c"
 
/* Align the parameters of "mpa1" and "mpa2", check that the ranges
 * of "mpa1" and "mpa2" live in the same space, construct map space
 * between the domain spaces of "mpa1" and "mpa2" and call "order"
 * with this map space as extract argument.
 */
static __isl_give isl_map *isl_multi_pw_aff_order_map(
  __isl_take isl_multi_pw_aff *mpa1, __isl_take isl_multi_pw_aff *mpa2,
  __isl_give isl_map *(*order)(__isl_keep isl_multi_pw_aff *mpa1,
    __isl_keep isl_multi_pw_aff *mpa2, __isl_take isl_space *space))
{
  int match;
  isl_space *space1, *space2;
  isl_map *res;
 
  mpa1 = isl_multi_pw_aff_align_params(mpa1,
              isl_multi_pw_aff_get_space(mpa2));
  mpa2 = isl_multi_pw_aff_align_params(mpa2,
              isl_multi_pw_aff_get_space(mpa1));
  if (!mpa1 || !mpa2)
    goto error;
  match = isl_space_tuple_is_equal(mpa1->space, isl_dim_out,
          mpa2->space, isl_dim_out);
  if (match < 0)
    goto error;
  if (!match)
    isl_die(isl_multi_pw_aff_get_ctx(mpa1), isl_error_invalid,
      "range spaces don't match", goto error);
  space1 = isl_space_domain(isl_multi_pw_aff_get_space(mpa1));
  space2 = isl_space_domain(isl_multi_pw_aff_get_space(mpa2));
  space1 = isl_space_map_from_domain_and_range(space1, space2);
 
  res = order(mpa1, mpa2, space1);
  isl_multi_pw_aff_free(mpa1);
  isl_multi_pw_aff_free(mpa2);
  return res;
error:
  isl_multi_pw_aff_free(mpa1);
  isl_multi_pw_aff_free(mpa2);
  return NULL;
}
 
/* Return a map containing pairs of elements in the domains of "mpa1" and "mpa2"
 * where the function values are equal.  "space" is the space of the result.
 * The parameters of "mpa1" and "mpa2" are assumed to have been aligned.
 *
 * "mpa1" and "mpa2" are equal when each of the pairs of elements
 * in the sequences are equal.
 */
static __isl_give isl_map *isl_multi_pw_aff_eq_map_on_space(
  __isl_keep isl_multi_pw_aff *mpa1, __isl_keep isl_multi_pw_aff *mpa2,
  __isl_take isl_space *space)
{
  int i;
  isl_size n;
  isl_map *res;
 
  n = isl_multi_pw_aff_dim(mpa1, isl_dim_out);
  if (n < 0)
    space = isl_space_free(space);
  res = isl_map_universe(space);
 
  for (i = 0; i < n; ++i) {
    isl_pw_aff *pa1, *pa2;
    isl_map *map;
 
    pa1 = isl_multi_pw_aff_get_pw_aff(mpa1, i);
    pa2 = isl_multi_pw_aff_get_pw_aff(mpa2, i);
    map = isl_pw_aff_eq_map(pa1, pa2);
    res = isl_map_intersect(res, map);
  }
 
  return res;
}
 
/* Return a map containing pairs of elements in the domains of "mpa1" and "mpa2"
 * where the function values are equal.
 */
__isl_give isl_map *isl_multi_pw_aff_eq_map(__isl_take isl_multi_pw_aff *mpa1,
  __isl_take isl_multi_pw_aff *mpa2)
{
  return isl_multi_pw_aff_order_map(mpa1, mpa2,
              &isl_multi_pw_aff_eq_map_on_space);
}
 
/* Intersect "map" with the result of applying "order"
 * on two copies of "mpa".
 */
static __isl_give isl_map *isl_map_order_at_multi_pw_aff(
  __isl_take isl_map *map, __isl_take isl_multi_pw_aff *mpa,
  __isl_give isl_map *(*order)(__isl_take isl_multi_pw_aff *mpa1,
    __isl_take isl_multi_pw_aff *mpa2))
{
  return isl_map_intersect(map, order(mpa, isl_multi_pw_aff_copy(mpa)));
}
 
/* Return the subset of "map" where the domain and the range
 * have equal "mpa" values.
 */
__isl_give isl_map *isl_map_eq_at_multi_pw_aff(__isl_take isl_map *map,
  __isl_take isl_multi_pw_aff *mpa)
{
  return isl_map_order_at_multi_pw_aff(map, mpa,
            &isl_multi_pw_aff_eq_map);
}
 
/* Return a map containing pairs of elements in the domains of "mpa1" and "mpa2"
 * where the function values of "mpa1" lexicographically satisfies
 * "strict_base"/"base" compared to that of "mpa2".
 * "space" is the space of the result.
 * The parameters of "mpa1" and "mpa2" are assumed to have been aligned.
 *
 * "mpa1" lexicographically satisfies "strict_base"/"base" compared to "mpa2"
 * if, for some i, the i-th element of "mpa1" satisfies "strict_base"/"base"
 * when compared to the i-th element of "mpa2" while all previous elements are
 * pairwise equal.
 * In particular, if i corresponds to the final elements
 * then they need to satisfy "base", while "strict_base" needs to be satisfied
 * for other values of i.
 * If "base" is a strict order, then "base" and "strict_base" are the same.
 */
static __isl_give isl_map *isl_multi_pw_aff_lex_map_on_space(
  __isl_keep isl_multi_pw_aff *mpa1, __isl_keep isl_multi_pw_aff *mpa2,
  __isl_give isl_map *(*strict_base)(__isl_take isl_pw_aff *pa1,
    __isl_take isl_pw_aff *pa2),
  __isl_give isl_map *(*base)(__isl_take isl_pw_aff *pa1,
    __isl_take isl_pw_aff *pa2),
  __isl_take isl_space *space)
{
  int i;
  isl_size n;
  isl_map *res, *rest;
 
  n = isl_multi_pw_aff_dim(mpa1, isl_dim_out);
  if (n < 0)
    space = isl_space_free(space);
  res = isl_map_empty(isl_space_copy(space));
  rest = isl_map_universe(space);
 
  for (i = 0; i < n; ++i) {
    int last;
    isl_pw_aff *pa1, *pa2;
    isl_map *map;
 
    last = i == n - 1;
 
    pa1 = isl_multi_pw_aff_get_pw_aff(mpa1, i);
    pa2 = isl_multi_pw_aff_get_pw_aff(mpa2, i);
    map = last ? base(pa1, pa2) : strict_base(pa1, pa2);
    map = isl_map_intersect(map, isl_map_copy(rest));
    res = isl_map_union(res, map);
 
    if (last)
      continue;
 
    pa1 = isl_multi_pw_aff_get_pw_aff(mpa1, i);
    pa2 = isl_multi_pw_aff_get_pw_aff(mpa2, i);
    map = isl_pw_aff_eq_map(pa1, pa2);
    rest = isl_map_intersect(rest, map);
  }
 
  isl_map_free(rest);
  return res;
}
 
#undef ORDER
#define ORDER   le
#undef STRICT_ORDER
#define STRICT_ORDER  lt
#include "isl_aff_lex_templ.c"
 
#undef ORDER
#define ORDER   lt
#undef STRICT_ORDER
#define STRICT_ORDER  lt
#include "isl_aff_lex_templ.c"
 
#undef ORDER
#define ORDER   ge
#undef STRICT_ORDER
#define STRICT_ORDER  gt
#include "isl_aff_lex_templ.c"
 
#undef ORDER
#define ORDER   gt
#undef STRICT_ORDER
#define STRICT_ORDER  gt
#include "isl_aff_lex_templ.c"
 
/* Compare two isl_affs.
 *
 * Return -1 if "aff1" is "smaller" than "aff2", 1 if "aff1" is "greater"
 * than "aff2" and 0 if they are equal.
 *
 * The order is fairly arbitrary.  We do consider expressions that only involve
 * earlier dimensions as "smaller".
 */
int isl_aff_plain_cmp(__isl_keep isl_aff *aff1, __isl_keep isl_aff *aff2)
{
  int cmp;
  int last1, last2;
 
  if (aff1 == aff2)
    return 0;
 
  if (!aff1)
    return -1;
  if (!aff2)
    return 1;
 
  cmp = isl_local_space_cmp(aff1->ls, aff2->ls);
  if (cmp != 0)
    return cmp;
 
  last1 = isl_seq_last_non_zero(aff1->v->el + 1, aff1->v->size - 1);
  last2 = isl_seq_last_non_zero(aff2->v->el + 1, aff1->v->size - 1);
  if (last1 != last2)
    return last1 - last2;
 
  return isl_seq_cmp(aff1->v->el, aff2->v->el, aff1->v->size);
}
 
/* Compare two isl_pw_affs.
 *
 * Return -1 if "pa1" is "smaller" than "pa2", 1 if "pa1" is "greater"
 * than "pa2" and 0 if they are equal.
 *
 * The order is fairly arbitrary.  We do consider expressions that only involve
 * earlier dimensions as "smaller".
 */
int isl_pw_aff_plain_cmp(__isl_keep isl_pw_aff *pa1,
  __isl_keep isl_pw_aff *pa2)
{
  int i;
  int cmp;
 
  if (pa1 == pa2)
    return 0;
 
  if (!pa1)
    return -1;
  if (!pa2)
    return 1;
 
  cmp = isl_space_cmp(pa1->dim, pa2->dim);
  if (cmp != 0)
    return cmp;
 
  if (pa1->n != pa2->n)
    return pa1->n - pa2->n;
 
  for (i = 0; i < pa1->n; ++i) {
    cmp = isl_set_plain_cmp(pa1->p[i].set, pa2->p[i].set);
    if (cmp != 0)
      return cmp;
    cmp = isl_aff_plain_cmp(pa1->p[i].aff, pa2->p[i].aff);
    if (cmp != 0)
      return cmp;
  }
 
  return 0;
}
 
/* Return a piecewise affine expression that is equal to "v" on "domain".
 */
__isl_give isl_pw_aff *isl_pw_aff_val_on_domain(__isl_take isl_set *domain,
  __isl_take isl_val *v)
{
  isl_space *space;
  isl_local_space *ls;
  isl_aff *aff;
 
  space = isl_set_get_space(domain);
  ls = isl_local_space_from_space(space);
  aff = isl_aff_val_on_domain(ls, v);
 
  return isl_pw_aff_alloc(domain, aff);
}
 
/* This function performs the same operation as isl_pw_aff_val_on_domain,
 * but is considered as a function on an isl_set when exported.
 */
__isl_give isl_pw_aff *isl_set_pw_aff_on_domain_val(__isl_take isl_set *domain,
  __isl_take isl_val *v)
{
  return isl_pw_aff_val_on_domain(domain, v);
}
 
/* Return a piecewise affine expression that is equal to the parameter
 * with identifier "id" on "domain".
 */
__isl_give isl_pw_aff *isl_pw_aff_param_on_domain_id(
  __isl_take isl_set *domain, __isl_take isl_id *id)
{
  isl_space *space;
  isl_aff *aff;
 
  space = isl_set_get_space(domain);
  space = isl_space_add_param_id(space, isl_id_copy(id));
  domain = isl_set_align_params(domain, isl_space_copy(space));
  aff = isl_aff_param_on_domain_space_id(space, id);
 
  return isl_pw_aff_alloc(domain, aff);
}
 
/* This function performs the same operation as
 * isl_pw_aff_param_on_domain_id,
 * but is considered as a function on an isl_set when exported.
 */
__isl_give isl_pw_aff *isl_set_param_pw_aff_on_domain_id(
  __isl_take isl_set *domain, __isl_take isl_id *id)
{
  return isl_pw_aff_param_on_domain_id(domain, id);
}
 
/* Return a multi affine expression that is equal to "mv" on domain
 * space "space".
 */
__isl_give isl_multi_aff *isl_multi_aff_multi_val_on_domain_space(
  __isl_take isl_space *space, __isl_take isl_multi_val *mv)
{
  int i;
  isl_size n;
  isl_space *space2;
  isl_local_space *ls;
  isl_multi_aff *ma;
 
  n = isl_multi_val_dim(mv, isl_dim_set);
  if (!space || n < 0)
    goto error;
 
  space2 = isl_multi_val_get_space(mv);
  space2 = isl_space_align_params(space2, isl_space_copy(space));
  space = isl_space_align_params(space, isl_space_copy(space2));
  space = isl_space_map_from_domain_and_range(space, space2);
  ma = isl_multi_aff_alloc(isl_space_copy(space));
  ls = isl_local_space_from_space(isl_space_domain(space));
  for (i = 0; i < n; ++i) {
    isl_val *v;
    isl_aff *aff;
 
    v = isl_multi_val_get_val(mv, i);
    aff = isl_aff_val_on_domain(isl_local_space_copy(ls), v);
    ma = isl_multi_aff_set_aff(ma, i, aff);
  }
  isl_local_space_free(ls);
 
  isl_multi_val_free(mv);
  return ma;
error:
  isl_space_free(space);
  isl_multi_val_free(mv);
  return NULL;
}
 
/* This is an alternative name for the function above.
 */
__isl_give isl_multi_aff *isl_multi_aff_multi_val_on_space(
  __isl_take isl_space *space, __isl_take isl_multi_val *mv)
{
  return isl_multi_aff_multi_val_on_domain_space(space, mv);
}
 
/* This function performs the same operation as
 * isl_multi_aff_multi_val_on_domain_space,
 * but is considered as a function on an isl_space when exported.
 */
__isl_give isl_multi_aff *isl_space_multi_aff_on_domain_multi_val(
  __isl_take isl_space *space, __isl_take isl_multi_val *mv)
{
  return isl_multi_aff_multi_val_on_domain_space(space, mv);
}
 
/* Return a piecewise multi-affine expression
 * that is equal to "mv" on "domain".
 */
__isl_give isl_pw_multi_aff *isl_pw_multi_aff_multi_val_on_domain(
  __isl_take isl_set *domain, __isl_take isl_multi_val *mv)
{
  isl_space *space;
  isl_multi_aff *ma;
 
  space = isl_set_get_space(domain);
  ma = isl_multi_aff_multi_val_on_space(space, mv);
 
  return isl_pw_multi_aff_alloc(domain, ma);
}
 
/* This function performs the same operation as
 * isl_pw_multi_aff_multi_val_on_domain,
 * but is considered as a function on an isl_set when exported.
 */
__isl_give isl_pw_multi_aff *isl_set_pw_multi_aff_on_domain_multi_val(
  __isl_take isl_set *domain, __isl_take isl_multi_val *mv)
{
  return isl_pw_multi_aff_multi_val_on_domain(domain, mv);
}
 
/* Internal data structure for isl_union_pw_multi_aff_multi_val_on_domain.
 * mv is the value that should be attained on each domain set
 * res collects the results
 */
struct isl_union_pw_multi_aff_multi_val_on_domain_data {
  isl_multi_val *mv;
  isl_union_pw_multi_aff *res;
};
 
/* Create an isl_pw_multi_aff equal to data->mv on "domain"
 * and add it to data->res.
 */
static isl_stat pw_multi_aff_multi_val_on_domain(__isl_take isl_set *domain,
  void *user)
{
  struct isl_union_pw_multi_aff_multi_val_on_domain_data *data = user;
  isl_pw_multi_aff *pma;
  isl_multi_val *mv;
 
  mv = isl_multi_val_copy(data->mv);
  pma = isl_pw_multi_aff_multi_val_on_domain(domain, mv);
  data->res = isl_union_pw_multi_aff_add_pw_multi_aff(data->res, pma);
 
  return data->res ? isl_stat_ok : isl_stat_error;
}
 
/* Return a union piecewise multi-affine expression
 * that is equal to "mv" on "domain".
 */
__isl_give isl_union_pw_multi_aff *isl_union_pw_multi_aff_multi_val_on_domain(
  __isl_take isl_union_set *domain, __isl_take isl_multi_val *mv)
{
  struct isl_union_pw_multi_aff_multi_val_on_domain_data data;
  isl_space *space;
 
  space = isl_union_set_get_space(domain);
  data.res = isl_union_pw_multi_aff_empty(space);
  data.mv = mv;
  if (isl_union_set_foreach_set(domain,
      &pw_multi_aff_multi_val_on_domain, &data) < 0)
    data.res = isl_union_pw_multi_aff_free(data.res);
  isl_union_set_free(domain);
  isl_multi_val_free(mv);
  return data.res;
}
 
/* Compute the pullback of data->pma by the function represented by "pma2",
 * provided the spaces match, and add the results to data->res.
 */
static isl_stat pullback_entry(__isl_take isl_pw_multi_aff *pma2, void *user)
{
  struct isl_union_pw_multi_aff_bin_data *data = user;
 
  if (!isl_space_tuple_is_equal(data->pma->dim, isl_dim_in,
         pma2->dim, isl_dim_out)) {
    isl_pw_multi_aff_free(pma2);
    return isl_stat_ok;
  }
 
  pma2 = isl_pw_multi_aff_pullback_pw_multi_aff(
          isl_pw_multi_aff_copy(data->pma), pma2);
 
  data->res = isl_union_pw_multi_aff_add_pw_multi_aff(data->res, pma2);
  if (!data->res)
    return isl_stat_error;
 
  return isl_stat_ok;
}
 
/* Compute the pullback of "upma1" by the function represented by "upma2".
 */
__isl_give isl_union_pw_multi_aff *
isl_union_pw_multi_aff_pullback_union_pw_multi_aff(
  __isl_take isl_union_pw_multi_aff *upma1,
  __isl_take isl_union_pw_multi_aff *upma2)
{
  return bin_op(upma1, upma2, &pullback_entry);
}
 
/* Apply "upma2" to "upma1".
 *
 * That is, compute the pullback of "upma2" by "upma1".
 */
__isl_give isl_union_pw_multi_aff *
isl_union_pw_multi_aff_apply_union_pw_multi_aff(
  __isl_take isl_union_pw_multi_aff *upma1,
  __isl_take isl_union_pw_multi_aff *upma2)
{
  return isl_union_pw_multi_aff_pullback_union_pw_multi_aff(upma2, upma1);
}
 
#undef BASE
#define BASE pw_multi_aff
static
#include "isl_copy_tuple_id_templ.c"
 
/* Given a function "pma1" of the form A[B -> C] -> D and
 * a function "pma2" of the form E -> B,
 * replace the domain of the wrapped relation inside the domain of "pma1"
 * by the preimage with respect to "pma2".
 * In other words, plug in "pma2" in this nested domain.
 * The result is of the form A[E -> C] -> D.
 *
 * In particular, extend E -> B to A[E -> C] -> A[B -> C] and
 * plug that into "pma1".
 */
__isl_give isl_pw_multi_aff *
isl_pw_multi_aff_preimage_domain_wrapped_domain_pw_multi_aff(
  __isl_take isl_pw_multi_aff *pma1, __isl_take isl_pw_multi_aff *pma2)
{
  isl_space *pma1_space, *pma2_space;
  isl_space *space;
  isl_pw_multi_aff *id;
 
  pma1_space = isl_pw_multi_aff_peek_space(pma1);
  pma2_space = isl_pw_multi_aff_peek_space(pma2);
 
  if (isl_space_check_domain_is_wrapping(pma1_space) < 0)
    goto error;
  if (isl_space_check_wrapped_tuple_is_equal(pma1_space,
      isl_dim_in, isl_dim_in, pma2_space, isl_dim_out) < 0)
    goto error;
 
  space = isl_space_domain(isl_space_copy(pma1_space));
  space = isl_space_range(isl_space_unwrap(space));
  id = isl_pw_multi_aff_identity_on_domain_space(space);
  pma2 = isl_pw_multi_aff_product(pma2, id);
 
  pma2 = isl_pw_multi_aff_copy_tuple_id(pma2, isl_dim_in,
            pma1_space, isl_dim_in);
  pma2 = isl_pw_multi_aff_copy_tuple_id(pma2, isl_dim_out,
            pma1_space, isl_dim_in);
 
  return isl_pw_multi_aff_pullback_pw_multi_aff(pma1, pma2);
error:
  isl_pw_multi_aff_free(pma1);
  isl_pw_multi_aff_free(pma2);
  return NULL;
}
 
/* If data->pma and "pma2" are such that
 * data->pma is of the form A[B -> C] -> D and
 * "pma2" is of the form E -> B,
 * then replace the domain of the wrapped relation
 * inside the domain of data->pma by the preimage with respect to "pma2" and
 * add the result to data->res.
 */
static isl_stat preimage_domain_wrapped_domain_entry(
  __isl_take isl_pw_multi_aff *pma2, void *user)
{
  struct isl_union_pw_multi_aff_bin_data *data = user;
  isl_space *pma1_space, *pma2_space;
  isl_bool match;
 
  pma1_space = isl_pw_multi_aff_peek_space(data->pma);
  pma2_space = isl_pw_multi_aff_peek_space(pma2);
 
  match = isl_space_domain_is_wrapping(pma1_space);
  if (match >= 0 && match)
    match = isl_space_wrapped_tuple_is_equal(pma1_space, isl_dim_in,
          isl_dim_in, pma2_space, isl_dim_out);
  if (match < 0 || !match) {
    isl_pw_multi_aff_free(pma2);
    return match < 0 ? isl_stat_error : isl_stat_ok;
  }
 
  pma2 = isl_pw_multi_aff_preimage_domain_wrapped_domain_pw_multi_aff(
    isl_pw_multi_aff_copy(data->pma), pma2);
 
  data->res = isl_union_pw_multi_aff_add_pw_multi_aff(data->res, pma2);
 
  return isl_stat_non_null(data->res);
}
 
/* For each pair of functions A[B -> C] -> D in "upma1" and
 * E -> B in "upma2",
 * replace the domain of the wrapped relation inside the domain of the first
 * by the preimage with respect to the second and collect the results.
 * In other words, plug in the second function in this nested domain.
 * The results are of the form A[E -> C] -> D.
 */
__isl_give isl_union_pw_multi_aff *
isl_union_pw_multi_aff_preimage_domain_wrapped_domain_union_pw_multi_aff(
  __isl_take isl_union_pw_multi_aff *upma1,
  __isl_take isl_union_pw_multi_aff *upma2)
{
  return bin_op(upma1, upma2, &preimage_domain_wrapped_domain_entry);
}
 
/* Check that the domain space of "upa" matches "space".
 *
 * This function is called from isl_multi_union_pw_aff_set_union_pw_aff and
 * can in principle never fail since the space "space" is that
 * of the isl_multi_union_pw_aff and is a set space such that
 * there is no domain space to match.
 *
 * We check the parameters and double-check that "space" is
 * indeed that of a set.
 */
static isl_stat isl_union_pw_aff_check_match_domain_space(
  __isl_keep isl_union_pw_aff *upa, __isl_keep isl_space *space)
{
  isl_space *upa_space;
  isl_bool match;
 
  if (!upa || !space)
    return isl_stat_error;
 
  match = isl_space_is_set(space);
  if (match < 0)
    return isl_stat_error;
  if (!match)
    isl_die(isl_space_get_ctx(space), isl_error_invalid,
      "expecting set space", return isl_stat_error);
 
  upa_space = isl_union_pw_aff_get_space(upa);
  match = isl_space_has_equal_params(space, upa_space);
  if (match < 0)
    goto error;
  if (!match)
    isl_die(isl_space_get_ctx(space), isl_error_invalid,
      "parameters don't match", goto error);
 
  isl_space_free(upa_space);
  return isl_stat_ok;
error:
  isl_space_free(upa_space);
  return isl_stat_error;
}
 
/* Do the parameters of "upa" match those of "space"?
 */
static isl_bool isl_union_pw_aff_matching_params(
  __isl_keep isl_union_pw_aff *upa, __isl_keep isl_space *space)
{
  isl_space *upa_space;
  isl_bool match;
 
  if (!upa || !space)
    return isl_bool_error;
 
  upa_space = isl_union_pw_aff_get_space(upa);
 
  match = isl_space_has_equal_params(space, upa_space);
 
  isl_space_free(upa_space);
  return match;
}
 
/* Internal data structure for isl_union_pw_aff_reset_domain_space.
 * space represents the new parameters.
 * res collects the results.
 */
struct isl_union_pw_aff_reset_params_data {
  isl_space *space;
  isl_union_pw_aff *res;
};
 
/* Replace the parameters of "pa" by data->space and
 * add the result to data->res.
 */
static isl_stat reset_params(__isl_take isl_pw_aff *pa, void *user)
{
  struct isl_union_pw_aff_reset_params_data *data = user;
  isl_space *space;
 
  space = isl_pw_aff_get_space(pa);
  space = isl_space_replace_params(space, data->space);
  pa = isl_pw_aff_reset_space(pa, space);
  data->res = isl_union_pw_aff_add_pw_aff(data->res, pa);
 
  return data->res ? isl_stat_ok : isl_stat_error;
}
 
/* Replace the domain space of "upa" by "space".
 * Since a union expression does not have a (single) domain space,
 * "space" is necessarily a parameter space.
 *
 * Since the order and the names of the parameters determine
 * the hash value, we need to create a new hash table.
 */
static __isl_give isl_union_pw_aff *isl_union_pw_aff_reset_domain_space(
  __isl_take isl_union_pw_aff *upa, __isl_take isl_space *space)
{
  struct isl_union_pw_aff_reset_params_data data = { space };
  isl_bool match;
 
  match = isl_union_pw_aff_matching_params(upa, space);
  if (match < 0)
    upa = isl_union_pw_aff_free(upa);
  else if (match) {
    isl_space_free(space);
    return upa;
  }
 
  data.res = isl_union_pw_aff_empty(isl_space_copy(space));
  if (isl_union_pw_aff_foreach_pw_aff(upa, &reset_params, &data) < 0)
    data.res = isl_union_pw_aff_free(data.res);
 
  isl_union_pw_aff_free(upa);
  isl_space_free(space);
  return data.res;
}
 
/* Return the floor of "pa".
 */
static __isl_give isl_pw_aff *floor_entry(__isl_take isl_pw_aff *pa, void *user)
{
  return isl_pw_aff_floor(pa);
}
 
/* Given f, return floor(f).
 */
__isl_give isl_union_pw_aff *isl_union_pw_aff_floor(
  __isl_take isl_union_pw_aff *upa)
{
  return isl_union_pw_aff_transform_inplace(upa, &floor_entry, NULL);
}
 
/* Compute
 *
 *  upa mod m = upa - m * floor(upa/m)
 *
 * with m an integer value.
 */
__isl_give isl_union_pw_aff *isl_union_pw_aff_mod_val(
  __isl_take isl_union_pw_aff *upa, __isl_take isl_val *m)
{
  isl_union_pw_aff *res;
 
  if (!upa || !m)
    goto error;
 
  if (!isl_val_is_int(m))
    isl_die(isl_val_get_ctx(m), isl_error_invalid,
      "expecting integer modulo", goto error);
  if (!isl_val_is_pos(m))
    isl_die(isl_val_get_ctx(m), isl_error_invalid,
      "expecting positive modulo", goto error);
 
  res = isl_union_pw_aff_copy(upa);
  upa = isl_union_pw_aff_scale_down_val(upa, isl_val_copy(m));
  upa = isl_union_pw_aff_floor(upa);
  upa = isl_union_pw_aff_scale_val(upa, m);
  res = isl_union_pw_aff_sub(res, upa);
 
  return res;
error:
  isl_val_free(m);
  isl_union_pw_aff_free(upa);
  return NULL;
}
 
/* Internal data structure for isl_union_pw_multi_aff_get_union_pw_aff.
 * pos is the output position that needs to be extracted.
 * res collects the results.
 */
struct isl_union_pw_multi_aff_get_union_pw_aff_data {
  int pos;
  isl_union_pw_aff *res;
};
 
/* Extract an isl_pw_aff corresponding to output dimension "pos" of "pma"
 * (assuming it has such a dimension) and add it to data->res.
 */
static isl_stat get_union_pw_aff(__isl_take isl_pw_multi_aff *pma, void *user)
{
  struct isl_union_pw_multi_aff_get_union_pw_aff_data *data = user;
  isl_size n_out;
  isl_pw_aff *pa;
 
  n_out = isl_pw_multi_aff_dim(pma, isl_dim_out);
  if (n_out < 0)
    return isl_stat_error;
  if (data->pos >= n_out) {
    isl_pw_multi_aff_free(pma);
    return isl_stat_ok;
  }
 
  pa = isl_pw_multi_aff_get_pw_aff(pma, data->pos);
  isl_pw_multi_aff_free(pma);
 
  data->res = isl_union_pw_aff_add_pw_aff(data->res, pa);
 
  return data->res ? isl_stat_ok : isl_stat_error;
}
 
/* Extract an isl_union_pw_aff corresponding to
 * output dimension "pos" of "upma".
 */
__isl_give isl_union_pw_aff *isl_union_pw_multi_aff_get_union_pw_aff(
  __isl_keep isl_union_pw_multi_aff *upma, int pos)
{
  struct isl_union_pw_multi_aff_get_union_pw_aff_data data;
  isl_space *space;
 
  if (!upma)
    return NULL;
 
  if (pos < 0)
    isl_die(isl_union_pw_multi_aff_get_ctx(upma), isl_error_invalid,
      "cannot extract at negative position", return NULL);
 
  space = isl_union_pw_multi_aff_get_space(upma);
  data.res = isl_union_pw_aff_empty(space);
  data.pos = pos;
  if (isl_union_pw_multi_aff_foreach_pw_multi_aff(upma,
            &get_union_pw_aff, &data) < 0)
    data.res = isl_union_pw_aff_free(data.res);
 
  return data.res;
}
 
/* Return a union piecewise affine expression
 * that is equal to "aff" on "domain".
 */
__isl_give isl_union_pw_aff *isl_union_pw_aff_aff_on_domain(
  __isl_take isl_union_set *domain, __isl_take isl_aff *aff)
{
  isl_pw_aff *pa;
 
  pa = isl_pw_aff_from_aff(aff);
  return isl_union_pw_aff_pw_aff_on_domain(domain, pa);
}
 
/* Return a union piecewise affine expression
 * that is equal to the parameter identified by "id" on "domain".
 *
 * Make sure the parameter appears in the space passed to
 * isl_aff_param_on_domain_space_id.
 */
__isl_give isl_union_pw_aff *isl_union_pw_aff_param_on_domain_id(
  __isl_take isl_union_set *domain, __isl_take isl_id *id)
{
  isl_space *space;
  isl_aff *aff;
 
  space = isl_union_set_get_space(domain);
  space = isl_space_add_param_id(space, isl_id_copy(id));
  aff = isl_aff_param_on_domain_space_id(space, id);
  return isl_union_pw_aff_aff_on_domain(domain, aff);
}
 
/* Internal data structure for isl_union_pw_aff_pw_aff_on_domain.
 * "pa" is the piecewise symbolic value that the resulting isl_union_pw_aff
 * needs to attain.
 * "res" collects the results.
 */
struct isl_union_pw_aff_pw_aff_on_domain_data {
  isl_pw_aff *pa;
  isl_union_pw_aff *res;
};
 
/* Construct a piecewise affine expression that is equal to data->pa
 * on "domain" and add the result to data->res.
 */
static isl_stat pw_aff_on_domain(__isl_take isl_set *domain, void *user)
{
  struct isl_union_pw_aff_pw_aff_on_domain_data *data = user;
  isl_pw_aff *pa;
  isl_size dim;
 
  pa = isl_pw_aff_copy(data->pa);
  dim = isl_set_dim(domain, isl_dim_set);
  if (dim < 0)
    pa = isl_pw_aff_free(pa);
  pa = isl_pw_aff_from_range(pa);
  pa = isl_pw_aff_add_dims(pa, isl_dim_in, dim);
  pa = isl_pw_aff_reset_domain_space(pa, isl_set_get_space(domain));
  pa = isl_pw_aff_intersect_domain(pa, domain);
  data->res = isl_union_pw_aff_add_pw_aff(data->res, pa);
 
  return data->res ? isl_stat_ok : isl_stat_error;
}
 
/* Return a union piecewise affine expression
 * that is equal to "pa" on "domain", assuming "domain" and "pa"
 * have been aligned.
 *
 * Construct an isl_pw_aff on each of the sets in "domain" and
 * collect the results.
 */
static __isl_give isl_union_pw_aff *isl_union_pw_aff_pw_aff_on_domain_aligned(
  __isl_take isl_union_set *domain, __isl_take isl_pw_aff *pa)
{
  struct isl_union_pw_aff_pw_aff_on_domain_data data;
  isl_space *space;
 
  space = isl_union_set_get_space(domain);
  data.res = isl_union_pw_aff_empty(space);
  data.pa = pa;
  if (isl_union_set_foreach_set(domain, &pw_aff_on_domain, &data) < 0)
    data.res = isl_union_pw_aff_free(data.res);
  isl_union_set_free(domain);
  isl_pw_aff_free(pa);
  return data.res;
}
 
/* Return a union piecewise affine expression
 * that is equal to "pa" on "domain".
 *
 * Check that "pa" is a parametric expression,
 * align the parameters if needed and call
 * isl_union_pw_aff_pw_aff_on_domain_aligned.
 */
__isl_give isl_union_pw_aff *isl_union_pw_aff_pw_aff_on_domain(
  __isl_take isl_union_set *domain, __isl_take isl_pw_aff *pa)
{
  isl_bool is_set;
  isl_bool equal_params;
  isl_space *domain_space, *pa_space;
 
  pa_space = isl_pw_aff_peek_space(pa);
  is_set = isl_space_is_set(pa_space);
  if (is_set < 0)
    goto error;
  if (!is_set)
    isl_die(isl_pw_aff_get_ctx(pa), isl_error_invalid,
      "expecting parametric expression", goto error);
 
  domain_space = isl_union_set_get_space(domain);
  pa_space = isl_pw_aff_get_space(pa);
  equal_params = isl_space_has_equal_params(domain_space, pa_space);
  if (equal_params >= 0 && !equal_params) {
    isl_space *space;
 
    space = isl_space_align_params(domain_space, pa_space);
    pa = isl_pw_aff_align_params(pa, isl_space_copy(space));
    domain = isl_union_set_align_params(domain, space);
  } else {
    isl_space_free(domain_space);
    isl_space_free(pa_space);
  }
 
  if (equal_params < 0)
    goto error;
  return isl_union_pw_aff_pw_aff_on_domain_aligned(domain, pa);
error:
  isl_union_set_free(domain);
  isl_pw_aff_free(pa);
  return NULL;
}
 
/* Internal data structure for isl_union_pw_aff_val_on_domain.
 * "v" is the value that the resulting isl_union_pw_aff needs to attain.
 * "res" collects the results.
 */
struct isl_union_pw_aff_val_on_domain_data {
  isl_val *v;
  isl_union_pw_aff *res;
};
 
/* Construct a piecewise affine expression that is equal to data->v
 * on "domain" and add the result to data->res.
 */
static isl_stat pw_aff_val_on_domain(__isl_take isl_set *domain, void *user)
{
  struct isl_union_pw_aff_val_on_domain_data *data = user;
  isl_pw_aff *pa;
  isl_val *v;
 
  v = isl_val_copy(data->v);
  pa = isl_pw_aff_val_on_domain(domain, v);
  data->res = isl_union_pw_aff_add_pw_aff(data->res, pa);
 
  return data->res ? isl_stat_ok : isl_stat_error;
}
 
/* Return a union piecewise affine expression
 * that is equal to "v" on "domain".
 *
 * Construct an isl_pw_aff on each of the sets in "domain" and
 * collect the results.
 */
__isl_give isl_union_pw_aff *isl_union_pw_aff_val_on_domain(
  __isl_take isl_union_set *domain, __isl_take isl_val *v)
{
  struct isl_union_pw_aff_val_on_domain_data data;
  isl_space *space;
 
  space = isl_union_set_get_space(domain);
  data.res = isl_union_pw_aff_empty(space);
  data.v = v;
  if (isl_union_set_foreach_set(domain, &pw_aff_val_on_domain, &data) < 0)
    data.res = isl_union_pw_aff_free(data.res);
  isl_union_set_free(domain);
  isl_val_free(v);
  return data.res;
}
 
/* Construct a piecewise multi affine expression
 * that is equal to "pa" and add it to upma.
 */
static isl_stat pw_multi_aff_from_pw_aff_entry(__isl_take isl_pw_aff *pa,
  void *user)
{
  isl_union_pw_multi_aff **upma = user;
  isl_pw_multi_aff *pma;
 
  pma = isl_pw_multi_aff_from_pw_aff(pa);
  *upma = isl_union_pw_multi_aff_add_pw_multi_aff(*upma, pma);
 
  return *upma ? isl_stat_ok : isl_stat_error;
}
 
/* Construct and return a union piecewise multi affine expression
 * that is equal to the given union piecewise affine expression.
 */
__isl_give isl_union_pw_multi_aff *isl_union_pw_multi_aff_from_union_pw_aff(
  __isl_take isl_union_pw_aff *upa)
{
  isl_space *space;
  isl_union_pw_multi_aff *upma;
 
  if (!upa)
    return NULL;
 
  space = isl_union_pw_aff_get_space(upa);
  upma = isl_union_pw_multi_aff_empty(space);
 
  if (isl_union_pw_aff_foreach_pw_aff(upa,
        &pw_multi_aff_from_pw_aff_entry, &upma) < 0)
    upma = isl_union_pw_multi_aff_free(upma);
 
  isl_union_pw_aff_free(upa);
  return upma;
}
 
/* Compute the set of elements in the domain of "pa" where it is zero and
 * add this set to "uset".
 */
static isl_stat zero_union_set(__isl_take isl_pw_aff *pa, void *user)
{
  isl_union_set **uset = (isl_union_set **)user;
 
  *uset = isl_union_set_add_set(*uset, isl_pw_aff_zero_set(pa));
 
  return *uset ? isl_stat_ok : isl_stat_error;
}
 
/* Return a union set containing those elements in the domain
 * of "upa" where it is zero.
 */
__isl_give isl_union_set *isl_union_pw_aff_zero_union_set(
  __isl_take isl_union_pw_aff *upa)
{
  isl_union_set *zero;
 
  zero = isl_union_set_empty(isl_union_pw_aff_get_space(upa));
  if (isl_union_pw_aff_foreach_pw_aff(upa, &zero_union_set, &zero) < 0)
    zero = isl_union_set_free(zero);
 
  isl_union_pw_aff_free(upa);
  return zero;
}
 
/* Internal data structure for isl_union_pw_aff_bind_id,
 * storing the parameter that needs to be bound and
 * the accumulated results.
 */
struct isl_bind_id_data {
  isl_id *id;
  isl_union_set *bound;
};
 
/* Bind the piecewise affine function "pa" to the parameter data->id,
 * adding the resulting elements in the domain where the expression
 * is equal to the parameter to data->bound.
 */
static isl_stat bind_id(__isl_take isl_pw_aff *pa, void *user)
{
  struct isl_bind_id_data *data = user;
  isl_set *bound;
 
  bound = isl_pw_aff_bind_id(pa, isl_id_copy(data->id));
  data->bound = isl_union_set_add_set(data->bound, bound);
 
  return data->bound ? isl_stat_ok : isl_stat_error;
}
 
/* Bind the union piecewise affine function "upa" to the parameter "id",
 * returning the elements in the domain where the expression
 * is equal to the parameter.
 */
__isl_give isl_union_set *isl_union_pw_aff_bind_id(
  __isl_take isl_union_pw_aff *upa, __isl_take isl_id *id)
{
  struct isl_bind_id_data data = { id };
 
  data.bound = isl_union_set_empty(isl_union_pw_aff_get_space(upa));
  if (isl_union_pw_aff_foreach_pw_aff(upa, &bind_id, &data) < 0)
    data.bound = isl_union_set_free(data.bound);
 
  isl_union_pw_aff_free(upa);
  isl_id_free(id);
  return data.bound;
}
 
/* Internal data structure for isl_union_pw_aff_pullback_union_pw_multi_aff.
 * upma is the function that is plugged in.
 * pa is the current part of the function in which upma is plugged in.
 * res collects the results.
 */
struct isl_union_pw_aff_pullback_upma_data {
  isl_union_pw_multi_aff *upma;
  isl_pw_aff *pa;
  isl_union_pw_aff *res;
};
 
/* Check if "pma" can be plugged into data->pa.
 * If so, perform the pullback and add the result to data->res.
 */
static isl_stat pa_pb_pma(__isl_take isl_pw_multi_aff *pma, void *user)
{
  struct isl_union_pw_aff_pullback_upma_data *data = user;
  isl_pw_aff *pa;
 
  if (!isl_space_tuple_is_equal(data->pa->dim, isl_dim_in,
         pma->dim, isl_dim_out)) {
    isl_pw_multi_aff_free(pma);
    return isl_stat_ok;
  }
 
  pa = isl_pw_aff_copy(data->pa);
  pa = isl_pw_aff_pullback_pw_multi_aff(pa, pma);
 
  data->res = isl_union_pw_aff_add_pw_aff(data->res, pa);
 
  return data->res ? isl_stat_ok : isl_stat_error;
}
 
/* Check if any of the elements of data->upma can be plugged into pa,
 * add if so add the result to data->res.
 */
static isl_stat upa_pb_upma(__isl_take isl_pw_aff *pa, void *user)
{
  struct isl_union_pw_aff_pullback_upma_data *data = user;
  isl_stat r;
 
  data->pa = pa;
  r = isl_union_pw_multi_aff_foreach_pw_multi_aff(data->upma,
           &pa_pb_pma, data);
  isl_pw_aff_free(pa);
 
  return r;
}
 
/* Compute the pullback of "upa" by the function represented by "upma".
 * In other words, plug in "upma" in "upa".  The result contains
 * expressions defined over the domain space of "upma".
 *
 * Run over all pairs of elements in "upa" and "upma", perform
 * the pullback when appropriate and collect the results.
 * If the hash value were based on the domain space rather than
 * the function space, then we could run through all elements
 * of "upma" and directly pick out the corresponding element of "upa".
 */
__isl_give isl_union_pw_aff *isl_union_pw_aff_pullback_union_pw_multi_aff(
  __isl_take isl_union_pw_aff *upa,
  __isl_take isl_union_pw_multi_aff *upma)
{
  struct isl_union_pw_aff_pullback_upma_data data = { NULL, NULL };
  isl_space *space;
 
  space = isl_union_pw_multi_aff_get_space(upma);
  upa = isl_union_pw_aff_align_params(upa, space);
  space = isl_union_pw_aff_get_space(upa);
  upma = isl_union_pw_multi_aff_align_params(upma, space);
 
  if (!upa || !upma)
    goto error;
 
  data.upma = upma;
  data.res = isl_union_pw_aff_alloc_same_size(upa);
  if (isl_union_pw_aff_foreach_pw_aff(upa, &upa_pb_upma, &data) < 0)
    data.res = isl_union_pw_aff_free(data.res);
 
  isl_union_pw_aff_free(upa);
  isl_union_pw_multi_aff_free(upma);
  return data.res;
error:
  isl_union_pw_aff_free(upa);
  isl_union_pw_multi_aff_free(upma);
  return NULL;
}
 
#undef BASE
#define BASE union_pw_aff
#undef DOMBASE
#define DOMBASE union_set
 
#include <isl_multi_explicit_domain.c>
#include <isl_multi_union_pw_aff_explicit_domain.c>
#include <isl_multi_templ.c>
#include <isl_multi_un_op_templ.c>
#include <isl_multi_bin_val_templ.c>
#include <isl_multi_align_set.c>
#include <isl_multi_align_union_set.c>
#include <isl_multi_apply_set_explicit_domain_templ.c>
#include <isl_multi_apply_union_set_explicit_domain_templ.c>
#include <isl_multi_arith_templ.c>
#include <isl_multi_bind_templ.c>
#include <isl_multi_coalesce.c>
#include <isl_multi_dim_id_templ.c>
#include <isl_multi_floor.c>
#include <isl_multi_from_base_templ.c>
#include <isl_multi_check_domain_templ.c>
#include <isl_multi_gist.c>
#include <isl_multi_intersect.c>
#include <isl_multi_nan_templ.c>
#include <isl_multi_tuple_id_templ.c>
#include <isl_multi_union_add_templ.c>
#include <isl_multi_zero_space_templ.c>
 
/* Does "mupa" have a non-trivial explicit domain?
 *
 * The explicit domain, if present, is trivial if it represents
 * an (obviously) universe parameter set.
 */
isl_bool isl_multi_union_pw_aff_has_non_trivial_domain(
  __isl_keep isl_multi_union_pw_aff *mupa)
{
  isl_bool is_params, trivial;
  isl_set *set;
 
  if (!mupa)
    return isl_bool_error;
  if (!isl_multi_union_pw_aff_has_explicit_domain(mupa))
    return isl_bool_false;
  is_params = isl_union_set_is_params(mupa->u.dom);
  if (is_params < 0 || !is_params)
    return isl_bool_not(is_params);
  set = isl_set_from_union_set(isl_union_set_copy(mupa->u.dom));
  trivial = isl_set_plain_is_universe(set);
  isl_set_free(set);
  return isl_bool_not(trivial);
}
 
/* Construct a multiple union piecewise affine expression
 * in the given space with value zero in each of the output dimensions.
 *
 * Since there is no canonical zero value for
 * a union piecewise affine expression, we can only construct
 * a zero-dimensional "zero" value.
 */
__isl_give isl_multi_union_pw_aff *isl_multi_union_pw_aff_zero(
  __isl_take isl_space *space)
{
  isl_size dim;
 
  if (isl_space_check_is_proper_set(space) < 0)
    goto error;
  dim = isl_space_dim(space, isl_dim_set);
  if (dim < 0)
    goto error;
  if (dim != 0)
    isl_die(isl_space_get_ctx(space), isl_error_invalid,
      "expecting 0D space", goto error);
 
  return isl_multi_union_pw_aff_alloc(space);
error:
  isl_space_free(space);
  return NULL;
}
 
/* Construct and return a multi union piecewise affine expression
 * that is equal to the given multi affine expression.
 */
__isl_give isl_multi_union_pw_aff *isl_multi_union_pw_aff_from_multi_aff(
  __isl_take isl_multi_aff *ma)
{
  isl_multi_pw_aff *mpa;
 
  mpa = isl_multi_pw_aff_from_multi_aff(ma);
  return isl_multi_union_pw_aff_from_multi_pw_aff(mpa);
}
 
/* This function performs the same operation as
 * isl_multi_union_pw_aff_from_multi_aff, but is considered as a function on an
 * isl_multi_aff when exported.
 */
__isl_give isl_multi_union_pw_aff *isl_multi_aff_to_multi_union_pw_aff(
        __isl_take isl_multi_aff *ma)
{
        return isl_multi_union_pw_aff_from_multi_aff(ma);
}
 
/* Construct and return a multi union piecewise affine expression
 * that is equal to the given multi piecewise affine expression.
 *
 * If the resulting multi union piecewise affine expression has
 * an explicit domain, then assign it the domain of the input.
 * In other cases, the domain is stored in the individual elements.
 */
__isl_give isl_multi_union_pw_aff *isl_multi_union_pw_aff_from_multi_pw_aff(
  __isl_take isl_multi_pw_aff *mpa)
{
  int i;
  isl_size n;
  isl_space *space;
  isl_multi_union_pw_aff *mupa;
 
  n = isl_multi_pw_aff_dim(mpa, isl_dim_out);
  if (n < 0)
    mpa = isl_multi_pw_aff_free(mpa);
  if (!mpa)
    return NULL;
 
  space = isl_multi_pw_aff_get_space(mpa);
  space = isl_space_range(space);
  mupa = isl_multi_union_pw_aff_alloc(space);
 
  for (i = 0; i < n; ++i) {
    isl_pw_aff *pa;
    isl_union_pw_aff *upa;
 
    pa = isl_multi_pw_aff_get_pw_aff(mpa, i);
    upa = isl_union_pw_aff_from_pw_aff(pa);
    mupa = isl_multi_union_pw_aff_restore_check_space(mupa, i, upa);
  }
  if (isl_multi_union_pw_aff_has_explicit_domain(mupa)) {
    isl_union_set *dom;
    isl_multi_pw_aff *copy;
 
    copy = isl_multi_pw_aff_copy(mpa);
    dom = isl_union_set_from_set(isl_multi_pw_aff_domain(copy));
    mupa = isl_multi_union_pw_aff_intersect_domain(mupa, dom);
  }
 
  isl_multi_pw_aff_free(mpa);
 
  return mupa;
}
 
/* Extract the range space of "pma" and assign it to *space.
 * If *space has already been set (through a previous call to this function),
 * then check that the range space is the same.
 */
static isl_stat extract_space(__isl_take isl_pw_multi_aff *pma, void *user)
{
  isl_space **space = user;
  isl_space *pma_space;
  isl_bool equal;
 
  pma_space = isl_space_range(isl_pw_multi_aff_get_space(pma));
  isl_pw_multi_aff_free(pma);
 
  if (!pma_space)
    return isl_stat_error;
  if (!*space) {
    *space = pma_space;
    return isl_stat_ok;
  }
 
  equal = isl_space_is_equal(pma_space, *space);
  isl_space_free(pma_space);
 
  if (equal < 0)
    return isl_stat_error;
  if (!equal)
    isl_die(isl_space_get_ctx(*space), isl_error_invalid,
      "range spaces not the same", return isl_stat_error);
  return isl_stat_ok;
}
 
/* Construct and return a multi union piecewise affine expression
 * that is equal to the given union piecewise multi affine expression.
 *
 * In order to be able to perform the conversion, the input
 * needs to be non-empty and may only involve a single range space.
 *
 * If the resulting multi union piecewise affine expression has
 * an explicit domain, then assign it the domain of the input.
 * In other cases, the domain is stored in the individual elements.
 */
__isl_give isl_multi_union_pw_aff *
isl_multi_union_pw_aff_from_union_pw_multi_aff(
  __isl_take isl_union_pw_multi_aff *upma)
{
  isl_space *space = NULL;
  isl_multi_union_pw_aff *mupa;
  int i;
  isl_size n;
 
  n = isl_union_pw_multi_aff_n_pw_multi_aff(upma);
  if (n < 0)
    goto error;
  if (n == 0)
    isl_die(isl_union_pw_multi_aff_get_ctx(upma), isl_error_invalid,
      "cannot extract range space from empty input",
      goto error);
  if (isl_union_pw_multi_aff_foreach_pw_multi_aff(upma, &extract_space,
              &space) < 0)
    goto error;
 
  if (!space)
    goto error;
 
  n = isl_space_dim(space, isl_dim_set);
  if (n < 0)
    space = isl_space_free(space);
  mupa = isl_multi_union_pw_aff_alloc(space);
 
  for (i = 0; i < n; ++i) {
    isl_union_pw_aff *upa;
 
    upa = isl_union_pw_multi_aff_get_union_pw_aff(upma, i);
    mupa = isl_multi_union_pw_aff_set_union_pw_aff(mupa, i, upa);
  }
  if (isl_multi_union_pw_aff_has_explicit_domain(mupa)) {
    isl_union_set *dom;
    isl_union_pw_multi_aff *copy;
 
    copy = isl_union_pw_multi_aff_copy(upma);
    dom = isl_union_pw_multi_aff_domain(copy);
    mupa = isl_multi_union_pw_aff_intersect_domain(mupa, dom);
  }
 
  isl_union_pw_multi_aff_free(upma);
  return mupa;
error:
  isl_space_free(space);
  isl_union_pw_multi_aff_free(upma);
  return NULL;
}
 
/* This function performs the same operation as
 * isl_multi_union_pw_aff_from_union_pw_multi_aff,
 * but is considered as a function on an isl_union_pw_multi_aff when exported.
 */
__isl_give isl_multi_union_pw_aff *
isl_union_pw_multi_aff_as_multi_union_pw_aff(
  __isl_take isl_union_pw_multi_aff *upma)
{
  return isl_multi_union_pw_aff_from_union_pw_multi_aff(upma);
}
 
/* Try and create an isl_multi_union_pw_aff that is equivalent
 * to the given isl_union_map.
 * The isl_union_map is required to be single-valued in each space.
 * Moreover, it cannot be empty and all range spaces need to be the same.
 * Otherwise, an error is produced.
 */
__isl_give isl_multi_union_pw_aff *isl_multi_union_pw_aff_from_union_map(
  __isl_take isl_union_map *umap)
{
  isl_union_pw_multi_aff *upma;
 
  upma = isl_union_pw_multi_aff_from_union_map(umap);
  return isl_multi_union_pw_aff_from_union_pw_multi_aff(upma);
}
 
/* This function performs the same operation as
 * isl_multi_union_pw_aff_from_union_map,
 * but is considered as a function on an isl_union_map when exported.
 */
__isl_give isl_multi_union_pw_aff *isl_union_map_as_multi_union_pw_aff(
  __isl_take isl_union_map *umap)
{
  return isl_multi_union_pw_aff_from_union_map(umap);
}
 
/* Return a multiple union piecewise affine expression
 * that is equal to "mv" on "domain", assuming "domain" and "mv"
 * have been aligned.
 *
 * If the resulting multi union piecewise affine expression has
 * an explicit domain, then assign it the input domain.
 * In other cases, the domain is stored in the individual elements.
 */
static __isl_give isl_multi_union_pw_aff *
isl_multi_union_pw_aff_multi_val_on_domain_aligned(
  __isl_take isl_union_set *domain, __isl_take isl_multi_val *mv)
{
  int i;
  isl_size n;
  isl_space *space;
  isl_multi_union_pw_aff *mupa;
 
  n = isl_multi_val_dim(mv, isl_dim_set);
  if (!domain || n < 0)
    goto error;
 
  space = isl_multi_val_get_space(mv);
  mupa = isl_multi_union_pw_aff_alloc(space);
  for (i = 0; i < n; ++i) {
    isl_val *v;
    isl_union_pw_aff *upa;
 
    v = isl_multi_val_get_val(mv, i);
    upa = isl_union_pw_aff_val_on_domain(isl_union_set_copy(domain),
              v);
    mupa = isl_multi_union_pw_aff_set_union_pw_aff(mupa, i, upa);
  }
  if (isl_multi_union_pw_aff_has_explicit_domain(mupa))
    mupa = isl_multi_union_pw_aff_intersect_domain(mupa,
                isl_union_set_copy(domain));
 
  isl_union_set_free(domain);
  isl_multi_val_free(mv);
  return mupa;
error:
  isl_union_set_free(domain);
  isl_multi_val_free(mv);
  return NULL;
}
 
/* Return a multiple union piecewise affine expression
 * that is equal to "mv" on "domain".
 */
__isl_give isl_multi_union_pw_aff *isl_multi_union_pw_aff_multi_val_on_domain(
  __isl_take isl_union_set *domain, __isl_take isl_multi_val *mv)
{
  isl_bool equal_params;
 
  if (!domain || !mv)
    goto error;
  equal_params = isl_space_has_equal_params(domain->dim, mv->space);
  if (equal_params < 0)
    goto error;
  if (equal_params)
    return isl_multi_union_pw_aff_multi_val_on_domain_aligned(
                    domain, mv);
  domain = isl_union_set_align_params(domain,
            isl_multi_val_get_space(mv));
  mv = isl_multi_val_align_params(mv, isl_union_set_get_space(domain));
  return isl_multi_union_pw_aff_multi_val_on_domain_aligned(domain, mv);
error:
  isl_union_set_free(domain);
  isl_multi_val_free(mv);
  return NULL;
}
 
/* Return a multiple union piecewise affine expression
 * that is equal to "ma" on "domain".
 */
__isl_give isl_multi_union_pw_aff *isl_multi_union_pw_aff_multi_aff_on_domain(
  __isl_take isl_union_set *domain, __isl_take isl_multi_aff *ma)
{
  isl_pw_multi_aff *pma;
 
  pma = isl_pw_multi_aff_from_multi_aff(ma);
  return isl_multi_union_pw_aff_pw_multi_aff_on_domain(domain, pma);
}
 
/* Return a multiple union piecewise affine expression
 * that is equal to "pma" on "domain", assuming "domain" and "pma"
 * have been aligned.
 *
 * If the resulting multi union piecewise affine expression has
 * an explicit domain, then assign it the input domain.
 * In other cases, the domain is stored in the individual elements.
 */
static __isl_give isl_multi_union_pw_aff *
isl_multi_union_pw_aff_pw_multi_aff_on_domain_aligned(
  __isl_take isl_union_set *domain, __isl_take isl_pw_multi_aff *pma)
{
  int i;
  isl_size n;
  isl_space *space;
  isl_multi_union_pw_aff *mupa;
 
  n = isl_pw_multi_aff_dim(pma, isl_dim_set);
  if (!domain || n < 0)
    goto error;
  space = isl_pw_multi_aff_get_space(pma);
  mupa = isl_multi_union_pw_aff_alloc(space);
  for (i = 0; i < n; ++i) {
    isl_pw_aff *pa;
    isl_union_pw_aff *upa;
 
    pa = isl_pw_multi_aff_get_pw_aff(pma, i);
    upa = isl_union_pw_aff_pw_aff_on_domain(
              isl_union_set_copy(domain), pa);
    mupa = isl_multi_union_pw_aff_set_union_pw_aff(mupa, i, upa);
  }
  if (isl_multi_union_pw_aff_has_explicit_domain(mupa))
    mupa = isl_multi_union_pw_aff_intersect_domain(mupa,
                isl_union_set_copy(domain));
 
  isl_union_set_free(domain);
  isl_pw_multi_aff_free(pma);
  return mupa;
error:
  isl_union_set_free(domain);
  isl_pw_multi_aff_free(pma);
  return NULL;
}
 
/* Return a multiple union piecewise affine expression
 * that is equal to "pma" on "domain".
 */
__isl_give isl_multi_union_pw_aff *
isl_multi_union_pw_aff_pw_multi_aff_on_domain(__isl_take isl_union_set *domain,
  __isl_take isl_pw_multi_aff *pma)
{
  isl_bool equal_params;
  isl_space *space;
 
  space = isl_pw_multi_aff_peek_space(pma);
  equal_params = isl_union_set_space_has_equal_params(domain, space);
  if (equal_params < 0)
    goto error;
  if (equal_params)
    return isl_multi_union_pw_aff_pw_multi_aff_on_domain_aligned(
                domain, pma);
  domain = isl_union_set_align_params(domain,
              isl_pw_multi_aff_get_space(pma));
  pma = isl_pw_multi_aff_align_params(pma,
              isl_union_set_get_space(domain));
  return isl_multi_union_pw_aff_pw_multi_aff_on_domain_aligned(domain,
                  pma);
error:
  isl_union_set_free(domain);
  isl_pw_multi_aff_free(pma);
  return NULL;
}
 
/* Return a union set containing those elements in the domains
 * of the elements of "mupa" where they are all zero.
 *
 * If there are no elements, then simply return the entire domain.
 */
__isl_give isl_union_set *isl_multi_union_pw_aff_zero_union_set(
  __isl_take isl_multi_union_pw_aff *mupa)
{
  int i;
  isl_size n;
  isl_union_pw_aff *upa;
  isl_union_set *zero;
 
  n = isl_multi_union_pw_aff_dim(mupa, isl_dim_set);
  if (n < 0)
    mupa = isl_multi_union_pw_aff_free(mupa);
  if (!mupa)
    return NULL;
 
  if (n == 0)
    return isl_multi_union_pw_aff_domain(mupa);
 
  upa = isl_multi_union_pw_aff_get_union_pw_aff(mupa, 0);
  zero = isl_union_pw_aff_zero_union_set(upa);
 
  for (i = 1; i < n; ++i) {
    isl_union_set *zero_i;
 
    upa = isl_multi_union_pw_aff_get_union_pw_aff(mupa, i);
    zero_i = isl_union_pw_aff_zero_union_set(upa);
 
    zero = isl_union_set_intersect(zero, zero_i);
  }
 
  isl_multi_union_pw_aff_free(mupa);
  return zero;
}
 
/* Construct a union map mapping the shared domain
 * of the union piecewise affine expressions to the range of "mupa"
 * in the special case of a 0D multi union piecewise affine expression.
 *
 * Construct a map between the explicit domain of "mupa" and
 * the range space.
 * Note that this assumes that the domain consists of explicit elements.
 */
static __isl_give isl_union_map *isl_union_map_from_multi_union_pw_aff_0D(
  __isl_take isl_multi_union_pw_aff *mupa)
{
  isl_bool is_params;
  isl_space *space;
  isl_union_set *dom, *ran;
 
  space = isl_multi_union_pw_aff_get_space(mupa);
  dom = isl_multi_union_pw_aff_domain(mupa);
  ran = isl_union_set_from_set(isl_set_universe(space));
 
  is_params = isl_union_set_is_params(dom);
  if (is_params < 0)
    dom = isl_union_set_free(dom);
  else if (is_params)
    isl_die(isl_union_set_get_ctx(dom), isl_error_invalid,
      "cannot create union map from expression without "
      "explicit domain elements",
      dom = isl_union_set_free(dom));
 
  return isl_union_map_from_domain_and_range(dom, ran);
}
 
/* Construct a union map mapping the shared domain
 * of the union piecewise affine expressions to the range of "mupa"
 * with each dimension in the range equated to the
 * corresponding union piecewise affine expression.
 *
 * If the input is zero-dimensional, then construct a mapping
 * from its explicit domain.
 */
__isl_give isl_union_map *isl_union_map_from_multi_union_pw_aff(
  __isl_take isl_multi_union_pw_aff *mupa)
{
  int i;
  isl_size n;
  isl_space *space;
  isl_union_map *umap;
  isl_union_pw_aff *upa;
 
  n = isl_multi_union_pw_aff_dim(mupa, isl_dim_set);
  if (n < 0)
    mupa = isl_multi_union_pw_aff_free(mupa);
  if (!mupa)
    return NULL;
 
  if (n == 0)
    return isl_union_map_from_multi_union_pw_aff_0D(mupa);
 
  upa = isl_multi_union_pw_aff_get_union_pw_aff(mupa, 0);
  umap = isl_union_map_from_union_pw_aff(upa);
 
  for (i = 1; i < n; ++i) {
    isl_union_map *umap_i;
 
    upa = isl_multi_union_pw_aff_get_union_pw_aff(mupa, i);
    umap_i = isl_union_map_from_union_pw_aff(upa);
    umap = isl_union_map_flat_range_product(umap, umap_i);
  }
 
  space = isl_multi_union_pw_aff_get_space(mupa);
  umap = isl_union_map_reset_range_space(umap, space);
 
  isl_multi_union_pw_aff_free(mupa);
  return umap;
}
 
/* Internal data structure for isl_union_pw_multi_aff_reset_range_space.
 * "range" is the space from which to set the range space.
 * "res" collects the results.
 */
struct isl_union_pw_multi_aff_reset_range_space_data {
  isl_space *range;
  isl_union_pw_multi_aff *res;
};
 
/* Replace the range space of "pma" by the range space of data->range and
 * add the result to data->res.
 */
static isl_stat reset_range_space(__isl_take isl_pw_multi_aff *pma, void *user)
{
  struct isl_union_pw_multi_aff_reset_range_space_data *data = user;
  isl_space *space;
 
  space = isl_pw_multi_aff_get_space(pma);
  space = isl_space_domain(space);
  space = isl_space_extend_domain_with_range(space,
            isl_space_copy(data->range));
  pma = isl_pw_multi_aff_reset_space(pma, space);
  data->res = isl_union_pw_multi_aff_add_pw_multi_aff(data->res, pma);
 
  return data->res ? isl_stat_ok : isl_stat_error;
}
 
/* Replace the range space of all the piecewise affine expressions in "upma" by
 * the range space of "space".
 *
 * This assumes that all these expressions have the same output dimension.
 *
 * Since the spaces of the expressions change, so do their hash values.
 * We therefore need to create a new isl_union_pw_multi_aff.
 * Note that the hash value is currently computed based on the entire
 * space even though there can only be a single expression with a given
 * domain space.
 */
static __isl_give isl_union_pw_multi_aff *
isl_union_pw_multi_aff_reset_range_space(
  __isl_take isl_union_pw_multi_aff *upma, __isl_take isl_space *space)
{
  struct isl_union_pw_multi_aff_reset_range_space_data data = { space };
  isl_space *space_upma;
 
  space_upma = isl_union_pw_multi_aff_get_space(upma);
  data.res = isl_union_pw_multi_aff_empty(space_upma);
  if (isl_union_pw_multi_aff_foreach_pw_multi_aff(upma,
          &reset_range_space, &data) < 0)
    data.res = isl_union_pw_multi_aff_free(data.res);
 
  isl_space_free(space);
  isl_union_pw_multi_aff_free(upma);
  return data.res;
}
 
/* Construct and return a union piecewise multi affine expression
 * that is equal to the given multi union piecewise affine expression,
 * in the special case of a 0D multi union piecewise affine expression.
 *
 * Construct a union piecewise multi affine expression
 * on top of the explicit domain of the input.
 */
__isl_give isl_union_pw_multi_aff *
isl_union_pw_multi_aff_from_multi_union_pw_aff_0D(
  __isl_take isl_multi_union_pw_aff *mupa)
{
  isl_space *space;
  isl_multi_val *mv;
  isl_union_set *domain;
 
  space = isl_multi_union_pw_aff_get_space(mupa);
  mv = isl_multi_val_zero(space);
  domain = isl_multi_union_pw_aff_domain(mupa);
  return isl_union_pw_multi_aff_multi_val_on_domain(domain, mv);
}
 
/* Construct and return a union piecewise multi affine expression
 * that is equal to the given multi union piecewise affine expression.
 *
 * If the input is zero-dimensional, then
 * construct a union piecewise multi affine expression
 * on top of the explicit domain of the input.
 */
__isl_give isl_union_pw_multi_aff *
isl_union_pw_multi_aff_from_multi_union_pw_aff(
  __isl_take isl_multi_union_pw_aff *mupa)
{
  int i;
  isl_size n;
  isl_space *space;
  isl_union_pw_multi_aff *upma;
  isl_union_pw_aff *upa;
 
  n = isl_multi_union_pw_aff_dim(mupa, isl_dim_set);
  if (n < 0)
    mupa = isl_multi_union_pw_aff_free(mupa);
  if (!mupa)
    return NULL;
 
  if (n == 0)
    return isl_union_pw_multi_aff_from_multi_union_pw_aff_0D(mupa);
 
  space = isl_multi_union_pw_aff_get_space(mupa);
  upa = isl_multi_union_pw_aff_get_union_pw_aff(mupa, 0);
  upma = isl_union_pw_multi_aff_from_union_pw_aff(upa);
 
  for (i = 1; i < n; ++i) {
    isl_union_pw_multi_aff *upma_i;
 
    upa = isl_multi_union_pw_aff_get_union_pw_aff(mupa, i);
    upma_i = isl_union_pw_multi_aff_from_union_pw_aff(upa);
    upma = isl_union_pw_multi_aff_flat_range_product(upma, upma_i);
  }
 
  upma = isl_union_pw_multi_aff_reset_range_space(upma, space);
 
  isl_multi_union_pw_aff_free(mupa);
  return upma;
}
 
/* Intersect the range of "mupa" with "range",
 * in the special case where "mupa" is 0D.
 *
 * Intersect the domain of "mupa" with the constraints on the parameters
 * of "range".
 */
static __isl_give isl_multi_union_pw_aff *mupa_intersect_range_0D(
  __isl_take isl_multi_union_pw_aff *mupa, __isl_take isl_set *range)
{
  range = isl_set_params(range);
  mupa = isl_multi_union_pw_aff_intersect_params(mupa, range);
  return mupa;
}
 
/* Intersect the range of "mupa" with "range".
 * That is, keep only those domain elements that have a function value
 * in "range".
 */
__isl_give isl_multi_union_pw_aff *isl_multi_union_pw_aff_intersect_range(
  __isl_take isl_multi_union_pw_aff *mupa, __isl_take isl_set *range)
{
  isl_union_pw_multi_aff *upma;
  isl_union_set *domain;
  isl_space *space;
  isl_size n;
  int match;
 
  n = isl_multi_union_pw_aff_dim(mupa, isl_dim_set);
  if (n < 0 || !range)
    goto error;
 
  space = isl_set_get_space(range);
  match = isl_space_tuple_is_equal(mupa->space, isl_dim_set,
          space, isl_dim_set);
  isl_space_free(space);
  if (match < 0)
    goto error;
  if (!match)
    isl_die(isl_multi_union_pw_aff_get_ctx(mupa), isl_error_invalid,
      "space don't match", goto error);
  if (n == 0)
    return mupa_intersect_range_0D(mupa, range);
 
  upma = isl_union_pw_multi_aff_from_multi_union_pw_aff(
          isl_multi_union_pw_aff_copy(mupa));
  domain = isl_union_set_from_set(range);
  domain = isl_union_set_preimage_union_pw_multi_aff(domain, upma);
  mupa = isl_multi_union_pw_aff_intersect_domain(mupa, domain);
 
  return mupa;
error:
  isl_multi_union_pw_aff_free(mupa);
  isl_set_free(range);
  return NULL;
}
 
/* Return the shared domain of the elements of "mupa",
 * in the special case where "mupa" is zero-dimensional.
 *
 * Return the explicit domain of "mupa".
 * Note that this domain may be a parameter set, either
 * because "mupa" is meant to live in a set space or
 * because no explicit domain has been set.
 */
__isl_give isl_union_set *isl_multi_union_pw_aff_domain_0D(
  __isl_take isl_multi_union_pw_aff *mupa)
{
  isl_union_set *dom;
 
  dom = isl_multi_union_pw_aff_get_explicit_domain(mupa);
  isl_multi_union_pw_aff_free(mupa);
 
  return dom;
}
 
/* Return the shared domain of the elements of "mupa".
 *
 * If "mupa" is zero-dimensional, then return its explicit domain.
 */
__isl_give isl_union_set *isl_multi_union_pw_aff_domain(
  __isl_take isl_multi_union_pw_aff *mupa)
{
  int i;
  isl_size n;
  isl_union_pw_aff *upa;
  isl_union_set *dom;
 
  n = isl_multi_union_pw_aff_dim(mupa, isl_dim_set);
  if (n < 0)
    mupa = isl_multi_union_pw_aff_free(mupa);
  if (!mupa)
    return NULL;
 
  if (n == 0)
    return isl_multi_union_pw_aff_domain_0D(mupa);
 
  upa = isl_multi_union_pw_aff_get_union_pw_aff(mupa, 0);
  dom = isl_union_pw_aff_domain(upa);
  for (i = 1; i < n; ++i) {
    isl_union_set *dom_i;
 
    upa = isl_multi_union_pw_aff_get_union_pw_aff(mupa, i);
    dom_i = isl_union_pw_aff_domain(upa);
    dom = isl_union_set_intersect(dom, dom_i);
  }
 
  isl_multi_union_pw_aff_free(mupa);
  return dom;
}
 
/* Apply "aff" to "mupa".  The space of "mupa" is equal to the domain of "aff".
 * In particular, the spaces have been aligned.
 * The result is defined over the shared domain of the elements of "mupa"
 *
 * We first extract the parametric constant part of "aff" and
 * define that over the shared domain.
 * Then we iterate over all input dimensions of "aff" and add the corresponding
 * multiples of the elements of "mupa".
 * Finally, we consider the integer divisions, calling the function
 * recursively to obtain an isl_union_pw_aff corresponding to the
 * integer division argument.
 */
static __isl_give isl_union_pw_aff *multi_union_pw_aff_apply_aff(
  __isl_take isl_multi_union_pw_aff *mupa, __isl_take isl_aff *aff)
{
  int i;
  isl_size n_in, n_div;
  isl_union_pw_aff *upa;
  isl_union_set *uset;
  isl_val *v;
  isl_aff *cst;
 
  n_in = isl_aff_dim(aff, isl_dim_in);
  n_div = isl_aff_dim(aff, isl_dim_div);
  if (n_in < 0 || n_div < 0)
    goto error;
 
  uset = isl_multi_union_pw_aff_domain(isl_multi_union_pw_aff_copy(mupa));
  cst = isl_aff_copy(aff);
  cst = isl_aff_drop_dims(cst, isl_dim_div, 0, n_div);
  cst = isl_aff_drop_dims(cst, isl_dim_in, 0, n_in);
  cst = isl_aff_project_domain_on_params(cst);
  upa = isl_union_pw_aff_aff_on_domain(uset, cst);
 
  for (i = 0; i < n_in; ++i) {
    isl_union_pw_aff *upa_i;
 
    if (!isl_aff_involves_dims(aff, isl_dim_in, i, 1))
      continue;
    v = isl_aff_get_coefficient_val(aff, isl_dim_in, i);
    upa_i = isl_multi_union_pw_aff_get_union_pw_aff(mupa, i);
    upa_i = isl_union_pw_aff_scale_val(upa_i, v);
    upa = isl_union_pw_aff_add(upa, upa_i);
  }
 
  for (i = 0; i < n_div; ++i) {
    isl_aff *div;
    isl_union_pw_aff *upa_i;
 
    if (!isl_aff_involves_dims(aff, isl_dim_div, i, 1))
      continue;
    div = isl_aff_get_div(aff, i);
    upa_i = multi_union_pw_aff_apply_aff(
          isl_multi_union_pw_aff_copy(mupa), div);
    upa_i = isl_union_pw_aff_floor(upa_i);
    v = isl_aff_get_coefficient_val(aff, isl_dim_div, i);
    upa_i = isl_union_pw_aff_scale_val(upa_i, v);
    upa = isl_union_pw_aff_add(upa, upa_i);
  }
 
  isl_multi_union_pw_aff_free(mupa);
  isl_aff_free(aff);
 
  return upa;
error:
  isl_multi_union_pw_aff_free(mupa);
  isl_aff_free(aff);
  return NULL;
}
 
/* Apply "aff" to "mupa".  The space of "mupa" needs to be compatible
 * with the domain of "aff".
 * Furthermore, the dimension of this space needs to be greater than zero.
 * The result is defined over the shared domain of the elements of "mupa"
 *
 * We perform these checks and then hand over control to
 * multi_union_pw_aff_apply_aff.
 */
__isl_give isl_union_pw_aff *isl_multi_union_pw_aff_apply_aff(
  __isl_take isl_multi_union_pw_aff *mupa, __isl_take isl_aff *aff)
{
  isl_size dim;
  isl_space *space1, *space2;
  isl_bool equal;
 
  mupa = isl_multi_union_pw_aff_align_params(mupa,
            isl_aff_get_space(aff));
  aff = isl_aff_align_params(aff, isl_multi_union_pw_aff_get_space(mupa));
  if (!mupa || !aff)
    goto error;
 
  space1 = isl_multi_union_pw_aff_get_space(mupa);
  space2 = isl_aff_get_domain_space(aff);
  equal = isl_space_is_equal(space1, space2);
  isl_space_free(space1);
  isl_space_free(space2);
  if (equal < 0)
    goto error;
  if (!equal)
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "spaces don't match", goto error);
  dim = isl_aff_dim(aff, isl_dim_in);
  if (dim < 0)
    goto error;
  if (dim == 0)
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "cannot determine domains", goto error);
 
  return multi_union_pw_aff_apply_aff(mupa, aff);
error:
  isl_multi_union_pw_aff_free(mupa);
  isl_aff_free(aff);
  return NULL;
}
 
/* Apply "ma" to "mupa", in the special case where "mupa" is 0D.
 * The space of "mupa" is known to be compatible with the domain of "ma".
 *
 * Construct an isl_multi_union_pw_aff that is equal to "ma"
 * on the domain of "mupa".
 */
static __isl_give isl_multi_union_pw_aff *mupa_apply_multi_aff_0D(
  __isl_take isl_multi_union_pw_aff *mupa, __isl_take isl_multi_aff *ma)
{
  isl_union_set *dom;
 
  dom = isl_multi_union_pw_aff_domain(mupa);
  ma = isl_multi_aff_project_domain_on_params(ma);
 
  return isl_multi_union_pw_aff_multi_aff_on_domain(dom, ma);
}
 
/* Apply "ma" to "mupa".  The space of "mupa" needs to be compatible
 * with the domain of "ma".
 * The result is defined over the shared domain of the elements of "mupa"
 */
__isl_give isl_multi_union_pw_aff *isl_multi_union_pw_aff_apply_multi_aff(
  __isl_take isl_multi_union_pw_aff *mupa, __isl_take isl_multi_aff *ma)
{
  isl_space *space1, *space2;
  isl_multi_union_pw_aff *res;
  isl_bool equal;
  int i;
  isl_size n_in, n_out;
 
  mupa = isl_multi_union_pw_aff_align_params(mupa,
            isl_multi_aff_get_space(ma));
  ma = isl_multi_aff_align_params(ma,
          isl_multi_union_pw_aff_get_space(mupa));
  n_in = isl_multi_aff_dim(ma, isl_dim_in);
  n_out = isl_multi_aff_dim(ma, isl_dim_out);
  if (!mupa || n_in < 0 || n_out < 0)
    goto error;
 
  space1 = isl_multi_union_pw_aff_get_space(mupa);
  space2 = isl_multi_aff_get_domain_space(ma);
  equal = isl_space_is_equal(space1, space2);
  isl_space_free(space1);
  isl_space_free(space2);
  if (equal < 0)
    goto error;
  if (!equal)
    isl_die(isl_multi_aff_get_ctx(ma), isl_error_invalid,
      "spaces don't match", goto error);
  if (n_in == 0)
    return mupa_apply_multi_aff_0D(mupa, ma);
 
  space1 = isl_space_range(isl_multi_aff_get_space(ma));
  res = isl_multi_union_pw_aff_alloc(space1);
 
  for (i = 0; i < n_out; ++i) {
    isl_aff *aff;
    isl_union_pw_aff *upa;
 
    aff = isl_multi_aff_get_aff(ma, i);
    upa = multi_union_pw_aff_apply_aff(
          isl_multi_union_pw_aff_copy(mupa), aff);
    res = isl_multi_union_pw_aff_set_union_pw_aff(res, i, upa);
  }
 
  isl_multi_aff_free(ma);
  isl_multi_union_pw_aff_free(mupa);
  return res;
error:
  isl_multi_union_pw_aff_free(mupa);
  isl_multi_aff_free(ma);
  return NULL;
}
 
/* Apply "pa" to "mupa", in the special case where "mupa" is 0D.
 * The space of "mupa" is known to be compatible with the domain of "pa".
 *
 * Construct an isl_multi_union_pw_aff that is equal to "pa"
 * on the domain of "mupa".
 */
static __isl_give isl_union_pw_aff *isl_multi_union_pw_aff_apply_pw_aff_0D(
  __isl_take isl_multi_union_pw_aff *mupa, __isl_take isl_pw_aff *pa)
{
  isl_union_set *dom;
 
  dom = isl_multi_union_pw_aff_domain(mupa);
  pa = isl_pw_aff_project_domain_on_params(pa);
 
  return isl_union_pw_aff_pw_aff_on_domain(dom, pa);
}
 
/* Apply "pa" to "mupa".  The space of "mupa" needs to be compatible
 * with the domain of "pa".
 * Furthermore, the dimension of this space needs to be greater than zero.
 * The result is defined over the shared domain of the elements of "mupa"
 */
__isl_give isl_union_pw_aff *isl_multi_union_pw_aff_apply_pw_aff(
  __isl_take isl_multi_union_pw_aff *mupa, __isl_take isl_pw_aff *pa)
{
  int i;
  isl_bool equal;
  isl_size n_in;
  isl_space *space, *space2;
  isl_union_pw_aff *upa;
 
  mupa = isl_multi_union_pw_aff_align_params(mupa,
            isl_pw_aff_get_space(pa));
  pa = isl_pw_aff_align_params(pa,
            isl_multi_union_pw_aff_get_space(mupa));
  if (!mupa || !pa)
    goto error;
 
  space = isl_multi_union_pw_aff_get_space(mupa);
  space2 = isl_pw_aff_get_domain_space(pa);
  equal = isl_space_is_equal(space, space2);
  isl_space_free(space);
  isl_space_free(space2);
  if (equal < 0)
    goto error;
  if (!equal)
    isl_die(isl_pw_aff_get_ctx(pa), isl_error_invalid,
      "spaces don't match", goto error);
  n_in = isl_pw_aff_dim(pa, isl_dim_in);
  if (n_in < 0)
    goto error;
  if (n_in == 0)
    return isl_multi_union_pw_aff_apply_pw_aff_0D(mupa, pa);
 
  space = isl_space_params(isl_multi_union_pw_aff_get_space(mupa));
  upa = isl_union_pw_aff_empty(space);
 
  for (i = 0; i < pa->n; ++i) {
    isl_aff *aff;
    isl_set *domain;
    isl_multi_union_pw_aff *mupa_i;
    isl_union_pw_aff *upa_i;
 
    mupa_i = isl_multi_union_pw_aff_copy(mupa);
    domain = isl_set_copy(pa->p[i].set);
    mupa_i = isl_multi_union_pw_aff_intersect_range(mupa_i, domain);
    aff = isl_aff_copy(pa->p[i].aff);
    upa_i = multi_union_pw_aff_apply_aff(mupa_i, aff);
    upa = isl_union_pw_aff_union_add(upa, upa_i);
  }
 
  isl_multi_union_pw_aff_free(mupa);
  isl_pw_aff_free(pa);
  return upa;
error:
  isl_multi_union_pw_aff_free(mupa);
  isl_pw_aff_free(pa);
  return NULL;
}
 
/* Apply "pma" to "mupa", in the special case where "mupa" is 0D.
 * The space of "mupa" is known to be compatible with the domain of "pma".
 *
 * Construct an isl_multi_union_pw_aff that is equal to "pma"
 * on the domain of "mupa".
 */
static __isl_give isl_multi_union_pw_aff *mupa_apply_pw_multi_aff_0D(
  __isl_take isl_multi_union_pw_aff *mupa,
  __isl_take isl_pw_multi_aff *pma)
{
  isl_union_set *dom;
 
  dom = isl_multi_union_pw_aff_domain(mupa);
  pma = isl_pw_multi_aff_project_domain_on_params(pma);
 
  return isl_multi_union_pw_aff_pw_multi_aff_on_domain(dom, pma);
}
 
/* Apply "pma" to "mupa".  The space of "mupa" needs to be compatible
 * with the domain of "pma".
 * The result is defined over the shared domain of the elements of "mupa"
 */
__isl_give isl_multi_union_pw_aff *isl_multi_union_pw_aff_apply_pw_multi_aff(
  __isl_take isl_multi_union_pw_aff *mupa,
  __isl_take isl_pw_multi_aff *pma)
{
  isl_space *space1, *space2;
  isl_multi_union_pw_aff *res;
  isl_bool equal;
  int i;
  isl_size n_in, n_out;
 
  mupa = isl_multi_union_pw_aff_align_params(mupa,
          isl_pw_multi_aff_get_space(pma));
  pma = isl_pw_multi_aff_align_params(pma,
          isl_multi_union_pw_aff_get_space(mupa));
  if (!mupa || !pma)
    goto error;
 
  space1 = isl_multi_union_pw_aff_get_space(mupa);
  space2 = isl_pw_multi_aff_get_domain_space(pma);
  equal = isl_space_is_equal(space1, space2);
  isl_space_free(space1);
  isl_space_free(space2);
  if (equal < 0)
    goto error;
  if (!equal)
    isl_die(isl_pw_multi_aff_get_ctx(pma), isl_error_invalid,
      "spaces don't match", goto error);
  n_in = isl_pw_multi_aff_dim(pma, isl_dim_in);
  n_out = isl_pw_multi_aff_dim(pma, isl_dim_out);
  if (n_in < 0 || n_out < 0)
    goto error;
  if (n_in == 0)
    return mupa_apply_pw_multi_aff_0D(mupa, pma);
 
  space1 = isl_space_range(isl_pw_multi_aff_get_space(pma));
  res = isl_multi_union_pw_aff_alloc(space1);
 
  for (i = 0; i < n_out; ++i) {
    isl_pw_aff *pa;
    isl_union_pw_aff *upa;
 
    pa = isl_pw_multi_aff_get_pw_aff(pma, i);
    upa = isl_multi_union_pw_aff_apply_pw_aff(
          isl_multi_union_pw_aff_copy(mupa), pa);
    res = isl_multi_union_pw_aff_set_union_pw_aff(res, i, upa);
  }
 
  isl_pw_multi_aff_free(pma);
  isl_multi_union_pw_aff_free(mupa);
  return res;
error:
  isl_multi_union_pw_aff_free(mupa);
  isl_pw_multi_aff_free(pma);
  return NULL;
}
 
/* Replace the explicit domain of "mupa" by its preimage under "upma".
 * If the explicit domain only keeps track of constraints on the parameters,
 * then only update those constraints.
 */
static __isl_give isl_multi_union_pw_aff *preimage_explicit_domain(
  __isl_take isl_multi_union_pw_aff *mupa,
  __isl_keep isl_union_pw_multi_aff *upma)
{
  isl_bool is_params;
 
  if (isl_multi_union_pw_aff_check_has_explicit_domain(mupa) < 0)
    return isl_multi_union_pw_aff_free(mupa);
 
  mupa = isl_multi_union_pw_aff_cow(mupa);
  if (!mupa)
    return NULL;
 
  is_params = isl_union_set_is_params(mupa->u.dom);
  if (is_params < 0)
    return isl_multi_union_pw_aff_free(mupa);
 
  upma = isl_union_pw_multi_aff_copy(upma);
  if (is_params)
    mupa->u.dom = isl_union_set_intersect_params(mupa->u.dom,
        isl_union_set_params(isl_union_pw_multi_aff_domain(upma)));
  else
    mupa->u.dom = isl_union_set_preimage_union_pw_multi_aff(
                  mupa->u.dom, upma);
  if (!mupa->u.dom)
    return isl_multi_union_pw_aff_free(mupa);
  return mupa;
}
 
/* Compute the pullback of "mupa" by the function represented by "upma".
 * In other words, plug in "upma" in "mupa".  The result contains
 * expressions defined over the domain space of "upma".
 *
 * Run over all elements of "mupa" and plug in "upma" in each of them.
 *
 * If "mupa" has an explicit domain, then it is this domain
 * that needs to undergo a pullback instead, i.e., a preimage.
 */
__isl_give isl_multi_union_pw_aff *
isl_multi_union_pw_aff_pullback_union_pw_multi_aff(
  __isl_take isl_multi_union_pw_aff *mupa,
  __isl_take isl_union_pw_multi_aff *upma)
{
  int i;
  isl_size n;
 
  mupa = isl_multi_union_pw_aff_align_params(mupa,
            isl_union_pw_multi_aff_get_space(upma));
  upma = isl_union_pw_multi_aff_align_params(upma,
            isl_multi_union_pw_aff_get_space(mupa));
  mupa = isl_multi_union_pw_aff_cow(mupa);
  n = isl_multi_union_pw_aff_dim(mupa, isl_dim_set);
  if (n < 0 || !upma)
    goto error;
 
  for (i = 0; i < n; ++i) {
    isl_union_pw_aff *upa;
 
    upa = isl_multi_union_pw_aff_get_union_pw_aff(mupa, i);
    upa = isl_union_pw_aff_pullback_union_pw_multi_aff(upa,
              isl_union_pw_multi_aff_copy(upma));
    mupa = isl_multi_union_pw_aff_set_union_pw_aff(mupa, i, upa);
  }
 
  if (isl_multi_union_pw_aff_has_explicit_domain(mupa))
    mupa = preimage_explicit_domain(mupa, upma);
 
  isl_union_pw_multi_aff_free(upma);
  return mupa;
error:
  isl_multi_union_pw_aff_free(mupa);
  isl_union_pw_multi_aff_free(upma);
  return NULL;
}
 
/* Extract the sequence of elements in "mupa" with domain space "space"
 * (ignoring parameters).
 *
 * For the elements of "mupa" that are not defined on the specified space,
 * the corresponding element in the result is empty.
 */
__isl_give isl_multi_pw_aff *isl_multi_union_pw_aff_extract_multi_pw_aff(
  __isl_keep isl_multi_union_pw_aff *mupa, __isl_take isl_space *space)
{
  int i;
  isl_size n;
  isl_space *space_mpa;
  isl_multi_pw_aff *mpa;
 
  n = isl_multi_union_pw_aff_dim(mupa, isl_dim_set);
  if (n < 0 || !space)
    goto error;
 
  space_mpa = isl_multi_union_pw_aff_get_space(mupa);
  space = isl_space_replace_params(space, space_mpa);
  space_mpa = isl_space_map_from_domain_and_range(isl_space_copy(space),
              space_mpa);
  mpa = isl_multi_pw_aff_alloc(space_mpa);
 
  space = isl_space_from_domain(space);
  space = isl_space_add_dims(space, isl_dim_out, 1);
  for (i = 0; i < n; ++i) {
    isl_union_pw_aff *upa;
    isl_pw_aff *pa;
 
    upa = isl_multi_union_pw_aff_get_union_pw_aff(mupa, i);
    pa = isl_union_pw_aff_extract_pw_aff(upa,
              isl_space_copy(space));
    mpa = isl_multi_pw_aff_set_pw_aff(mpa, i, pa);
    isl_union_pw_aff_free(upa);
  }
 
  isl_space_free(space);
  return mpa;
error:
  isl_space_free(space);
  return NULL;
}
 
/* Data structure that specifies how isl_union_pw_multi_aff_un_op
 * should modify the base expressions in the input.
 *
 * If "filter" is not NULL, then only the base expressions that satisfy "filter"
 * are taken into account.
 * "fn" is applied to each entry in the input.
 */
struct isl_union_pw_multi_aff_un_op_control {
  isl_bool (*filter)(__isl_keep isl_pw_multi_aff *part);
  __isl_give isl_pw_multi_aff *(*fn)(__isl_take isl_pw_multi_aff *pma);
};
 
/* Wrapper for isl_union_pw_multi_aff_un_op filter functions (which do not take
 * a second argument) for use as an isl_union_pw_multi_aff_transform
 * filter function (which does take a second argument).
 * Simply call control->filter without the second argument.
 */
static isl_bool isl_union_pw_multi_aff_un_op_filter_drop_user(
  __isl_take isl_pw_multi_aff *pma, void *user)
{
  struct isl_union_pw_multi_aff_un_op_control *control = user;
 
  return control->filter(pma);
}
 
/* Wrapper for isl_union_pw_multi_aff_un_op base functions (which do not take
 * a second argument) for use as an isl_union_pw_multi_aff_transform
 * base function (which does take a second argument).
 * Simply call control->fn without the second argument.
 */
static __isl_give isl_pw_multi_aff *isl_union_pw_multi_aff_un_op_drop_user(
  __isl_take isl_pw_multi_aff *pma, void *user)
{
  struct isl_union_pw_multi_aff_un_op_control *control = user;
 
  return control->fn(pma);
}
 
/* Construct an isl_union_pw_multi_aff that is obtained by
 * modifying "upma" according to "control".
 *
 * isl_union_pw_multi_aff_transform performs essentially
 * the same operation, but takes a filter and a callback function
 * of a different form (with an extra argument).
 * Call isl_union_pw_multi_aff_transform with wrappers
 * that remove this extra argument.
 */
static __isl_give isl_union_pw_multi_aff *isl_union_pw_multi_aff_un_op(
  __isl_take isl_union_pw_multi_aff *upma,
  struct isl_union_pw_multi_aff_un_op_control *control)
{
  struct isl_union_pw_multi_aff_transform_control t_control = {
    .filter = &isl_union_pw_multi_aff_un_op_filter_drop_user,
    .filter_user = control,
    .fn = &isl_union_pw_multi_aff_un_op_drop_user,
    .fn_user = control,
  };
 
  return isl_union_pw_multi_aff_transform(upma, &t_control);
}
 
/* For each function in "upma" of the form A -> [B -> C],
 * extract the function A -> B and collect the results.
 */
__isl_give isl_union_pw_multi_aff *isl_union_pw_multi_aff_range_factor_domain(
  __isl_take isl_union_pw_multi_aff *upma)
{
  struct isl_union_pw_multi_aff_un_op_control control = {
    .filter = &isl_pw_multi_aff_range_is_wrapping,
    .fn = &isl_pw_multi_aff_range_factor_domain,
  };
  return isl_union_pw_multi_aff_un_op(upma, &control);
}
 
/* For each function in "upma" of the form A -> [B -> C],
 * extract the function A -> C and collect the results.
 */
__isl_give isl_union_pw_multi_aff *isl_union_pw_multi_aff_range_factor_range(
  __isl_take isl_union_pw_multi_aff *upma)
{
  struct isl_union_pw_multi_aff_un_op_control control = {
    .filter = &isl_pw_multi_aff_range_is_wrapping,
    .fn = &isl_pw_multi_aff_range_factor_range,
  };
  return isl_union_pw_multi_aff_un_op(upma, &control);
}
 
/* Evaluate the affine function "aff" in the void point "pnt".
 * In particular, return the value NaN.
 */
static __isl_give isl_val *eval_void(__isl_take isl_aff *aff,
  __isl_take isl_point *pnt)
{
  isl_ctx *ctx;
 
  ctx = isl_point_get_ctx(pnt);
  isl_aff_free(aff);
  isl_point_free(pnt);
  return isl_val_nan(ctx);
}
 
/* Evaluate the affine expression "aff"
 * in the coordinates (with denominator) "pnt".
 */
static __isl_give isl_val *eval(__isl_keep isl_vec *aff,
  __isl_keep isl_vec *pnt)
{
  isl_int n, d;
  isl_ctx *ctx;
  isl_val *v;
 
  if (!aff || !pnt)
    return NULL;
 
  ctx = isl_vec_get_ctx(aff);
  isl_int_init(n);
  isl_int_init(d);
  isl_seq_inner_product(aff->el + 1, pnt->el, pnt->size, &n);
  isl_int_mul(d, aff->el[0], pnt->el[0]);
  v = isl_val_rat_from_isl_int(ctx, n, d);
  v = isl_val_normalize(v);
  isl_int_clear(n);
  isl_int_clear(d);
 
  return v;
}
 
/* Check that the domain space of "aff" is equal to "space".
 */
static isl_stat isl_aff_check_has_domain_space(__isl_keep isl_aff *aff,
  __isl_keep isl_space *space)
{
  isl_bool ok;
 
  ok = isl_space_is_equal(isl_aff_peek_domain_space(aff), space);
  if (ok < 0)
    return isl_stat_error;
  if (!ok)
    isl_die(isl_aff_get_ctx(aff), isl_error_invalid,
      "incompatible spaces", return isl_stat_error);
  return isl_stat_ok;
}
 
/* Evaluate the affine function "aff" in "pnt".
 */
__isl_give isl_val *isl_aff_eval(__isl_take isl_aff *aff,
  __isl_take isl_point *pnt)
{
  isl_bool is_void;
  isl_val *v;
  isl_local_space *ls;
 
  if (isl_aff_check_has_domain_space(aff, isl_point_peek_space(pnt)) < 0)
    goto error;
  is_void = isl_point_is_void(pnt);
  if (is_void < 0)
    goto error;
  if (is_void)
    return eval_void(aff, pnt);
 
  ls = isl_aff_get_domain_local_space(aff);
  pnt = isl_local_space_lift_point(ls, pnt);
 
  v = eval(aff->v, isl_point_peek_vec(pnt));
 
  isl_aff_free(aff);
  isl_point_free(pnt);
 
  return v;
error:
  isl_aff_free(aff);
  isl_point_free(pnt);
  return NULL;
}