This ParallelLoopGenerator subclass handles the generation of parallelized code, utilizing the GNU OpenMP library. More...

#include <LoopGeneratorsGOMP.h>

Inheritance diagram for polly::ParallelLoopGeneratorGOMP:

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Public Member Functions
	ParallelLoopGeneratorGOMP (PollyIRBuilder &Builder, LoopInfo &LI, DominatorTree &DT, const DataLayout &DL)
	Create a parallel loop generator for the current function.

void	createCallSpawnThreads (Value SubFn, Value SubFnParam, Value LB, Value UB, Value *Stride)
	Create a runtime library call to spawn the worker threads.

void	deployParallelExecution (Function SubFn, Value SubFnParam, Value LB, Value UB, Value *Stride) override
	Create the runtime library calls for spawn and join of the worker threads.

Function *	prepareSubFnDefinition (Function *F) const override
	Prepare the definition of the parallel subfunction.

std::tuple< Value , Function >	createSubFn (Value Stride, AllocaInst Struct, SetVector< Value * > UsedValues, ValueMapT &VMap) override
	Create the parallel subfunction.

void	createCallJoinThreads ()
	Create a runtime library call to join the worker threads.

Value *	createCallGetWorkItem (Value LBPtr, Value UBPtr)
	Create a runtime library call to get the next work item.

void	createCallCleanupThread ()
	Create a runtime library call to allow cleanup of the thread.

Public Member Functions inherited from polly::ParallelLoopGenerator
	ParallelLoopGenerator (PollyIRBuilder &Builder, LoopInfo &LI, DominatorTree &DT, const DataLayout &DL)
	Create a parallel loop generator for the current function.

virtual	~ParallelLoopGenerator ()

Value *	createParallelLoop (Value LB, Value UB, Value Stride, SetVector< Value > &Values, ValueMapT &VMap, BasicBlock::iterator *LoopBody)
	Create a parallel loop.

AllocaInst *	storeValuesIntoStruct (SetVector< Value * > &Values)
	Create a struct for all `Values` and store them in there.

void	extractValuesFromStruct (SetVector< Value * > Values, Type Ty, Value Struct, ValueMapT &VMap)
	Extract all values from the `Struct` and construct the mapping.

Function *	createSubFnDefinition ()
	Create the definition of the parallel subfunction.

virtual void	deployParallelExecution (Function SubFn, Value SubFnParam, Value LB, Value UB, Value *Stride)=0
	Create the runtime library calls for spawn and join of the worker threads.

virtual Function *	prepareSubFnDefinition (Function *F) const =0
	Prepare the definition of the parallel subfunction.

virtual std::tuple< Value , Function >	createSubFn (Value Stride, AllocaInst Struct, SetVector< Value * > UsedValues, ValueMapT &VMap)=0
	Create the parallel subfunction.

Additional Inherited Members
Protected Attributes inherited from polly::ParallelLoopGenerator
PollyIRBuilder &	Builder
	The IR builder we use to create instructions.

LoopInfo &	LI
	The loop info of the current function we need to update.

DominatorTree &	DT
	The dominance tree of the current function we need to update.

Type *	LongType
	The type of a "long" on this hardware used for backend calls.

Module *	M
	The current module.

llvm::DebugLoc	DLGenerated
	Debug location for generated code without direct link to any specific line.

Detailed Description

This ParallelLoopGenerator subclass handles the generation of parallelized code, utilizing the GNU OpenMP library.

Definition at line 25 of file LoopGeneratorsGOMP.h.

Constructor & Destructor Documentation

◆ ParallelLoopGeneratorGOMP()

polly::ParallelLoopGeneratorGOMP::ParallelLoopGeneratorGOMP	(	PollyIRBuilder &	Builder,
		LoopInfo &	LI,
		DominatorTree &	DT,
		const DataLayout &	DL
	)

inline

Create a parallel loop generator for the current function.

Definition at line 28 of file LoopGeneratorsGOMP.h.

Member Function Documentation

◆ createCallCleanupThread()

void ParallelLoopGeneratorGOMP::createCallCleanupThread ( )

Create a runtime library call to allow cleanup of the thread.

Note: This function is called right before the thread will exit the subfunction and only if the runtime system depends on it.

Definition at line 212 of file LoopGeneratorsGOMP.cpp.

References polly::ParallelLoopGenerator::Builder, polly::ParallelLoopGenerator::DLGenerated, Function, and polly::ParallelLoopGenerator::M.

Referenced by createSubFn().

◆ createCallGetWorkItem()

Value * ParallelLoopGeneratorGOMP::createCallGetWorkItem	(	Value *	LBPtr,
		Value *	UBPtr
	)

Create a runtime library call to get the next work item.

Parameters

LBPtr	A pointer value to store the work item begin in.
UBPtr	A pointer value to store the work item end in.

Returns: A true value if the work item is not empty.

Definition at line 173 of file LoopGeneratorsGOMP.cpp.

References polly::ParallelLoopGenerator::Builder, polly::ParallelLoopGenerator::DLGenerated, Function, polly::ParallelLoopGenerator::LongType, polly::ParallelLoopGenerator::M, and polly::Value.

Referenced by createSubFn().

◆ createCallJoinThreads()

void ParallelLoopGeneratorGOMP::createCallJoinThreads ( )

Create a runtime library call to join the worker threads.

Definition at line 195 of file LoopGeneratorsGOMP.cpp.

References polly::ParallelLoopGenerator::Builder, polly::ParallelLoopGenerator::DLGenerated, Function, and polly::ParallelLoopGenerator::M.

Referenced by deployParallelExecution().

◆ createCallSpawnThreads()

void ParallelLoopGeneratorGOMP::createCallSpawnThreads	(	Value *	SubFn,
		Value *	SubFnParam,
		Value *	LB,
		Value *	UB,
		Value *	Stride
	)

Create a runtime library call to spawn the worker threads.

Parameters

SubFn	The subfunction which holds the loop body.
SubFnParam	The parameter for the subfunction (basically the struct filled with the outside values).
LB	The lower bound for the loop we parallelize.
UB	The upper bound for the loop we parallelize.
Stride	The stride of the loop we parallelize.

Definition at line 20 of file LoopGeneratorsGOMP.cpp.

References polly::ParallelLoopGenerator::Builder, polly::ParallelLoopGenerator::DLGenerated, Function, polly::ParallelLoopGenerator::LongType, polly::ParallelLoopGenerator::M, polly::PollyNumThreads, and polly::Value.

Referenced by deployParallelExecution().

◆ createSubFn()

std::tuple< Value , Function > ParallelLoopGeneratorGOMP::createSubFn	(	Value *	Stride,
		AllocaInst *	Struct,
		SetVector< Value * >	UsedValues,
		ValueMapT &	VMap
	)

overridevirtual

Create the parallel subfunction.

Parameters

Stride	The induction variable increment.
Struct	A struct holding all values in `Values`.
Values	A set of LLVM-IR Values that should be available in the new loop body.
VMap	A map to allow outside access to the new versions of the values in `Values`.
SubFn	The newly created subfunction is returned here.

Returns: The newly created induction variable.

Implements polly::ParallelLoopGenerator.

Definition at line 93 of file LoopGeneratorsGOMP.cpp.

References polly::ParallelLoopGenerator::Builder, createCallCleanupThread(), createCallGetWorkItem(), polly::createLoop(), polly::ParallelLoopGenerator::createSubFnDefinition(), polly::ParallelLoopGenerator::DT, polly::ParallelLoopGenerator::extractValuesFromStruct(), Function, polly::ParallelLoopGenerator::LI, polly::ParallelLoopGenerator::LongType, polly::PollyChunkSize, polly::PollyScheduling, polly::Runtime, and polly::Value.

◆ deployParallelExecution()

void ParallelLoopGeneratorGOMP::deployParallelExecution	(	Function *	SubFn,
		Value *	SubFnParam,
		Value *	LB,
		Value *	UB,
		Value *	Stride
	)

overridevirtual

Create the runtime library calls for spawn and join of the worker threads.

Additionally, places a call to the specified subfunction.

Parameters

SubFn	The subfunction which holds the loop body.
SubFnParam	The parameter for the subfunction (basically the struct filled with the outside values).
LB	The lower bound for the loop we parallelize.
UB	The upper bound for the loop we parallelize.
Stride	The stride of the loop we parallelize.

Implements polly::ParallelLoopGenerator.

Definition at line 51 of file LoopGeneratorsGOMP.cpp.

References polly::ParallelLoopGenerator::Builder, createCallJoinThreads(), createCallSpawnThreads(), and polly::ParallelLoopGenerator::DLGenerated.

◆ prepareSubFnDefinition()

Function * ParallelLoopGeneratorGOMP::prepareSubFnDefinition ( Function * F ) const

overridevirtual

Prepare the definition of the parallel subfunction.

Creates the argument list and names them (as well as the subfunction).

Parameters

F	A pointer to the (parallel) subfunction's parent function.

Returns: The pointer to the (parallel) subfunction.

Implements polly::ParallelLoopGenerator.

Definition at line 62 of file LoopGeneratorsGOMP.cpp.

References polly::ParallelLoopGenerator::Builder, Function, and polly::ParallelLoopGenerator::M.

The documentation for this class was generated from the following files:

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ ParallelLoopGeneratorGOMP()

Member Function Documentation

◆ createCallCleanupThread()

◆ createCallGetWorkItem()

◆ createCallJoinThreads()

◆ createCallSpawnThreads()

◆ createSubFn()

◆ deployParallelExecution()

◆ prepareSubFnDefinition()