TODO
Overview
- Phase 4
- Phase 3 - Improve Robustness, Interoperability and Optimizations (ongoing)
- Polly as a LLVM Project (Finished February 2012)
- Phase 2 - First Optimizations and Enhanced User Experience (Finished February 2012)
- Phase 1 - Get Something Working (Finished October 2010)
Individual Phases
Phase 4
| Infrastructure | |||
|---|---|---|---|
| Task | Status | Owner | |
| Move to isl C++ bindings | Open | ||
| - Add isl C++ bindings generator to isl | Open | ||
| Add isl as an external library to Polly SVN | Done | ||
| Compile-time: Speed up transformations | |||
| - Optimize isl_int for small integers | Done | ||
| Compile-time: Minimize SCoP detection time | Open | ||
| - Reconsider pass-ordering (move Polly later) | Open | ||
| Increase coverage | |||
| Task | Status | Owner | |
| Support for Modulos | Done | Johannes | |
| Boolean Combinations | Done | Johannes | |
| Unsigned Integers | Done | Johannes | |
| Pointer Comparisons | Done | Johannes | |
| Non-affine subregions | Done | Johannes | |
| Polly as an analysis | |||
| Task | Status | Owner | |
| Model scalars dependences directly in Polly | Done | ||
| Code generate scalar dependences | Done | ||
| Model PHI dependences directly in Polly | Done | ||
| Code generate PHI dependences | Done | ||
| Remove the need for independent blocks | Done | ||
| Remove polly-prepare pass | Open | ||
| Correctness in cornercases | |||
| Task | Status | Owner | |
| Derive optimal types (instead of always using i64) | Open | ||
| Model integer wrapping | Done | Johannes | |
| Optimize Julia code with Polly analysis | |||
| Task | Status | Owner | |
| Integrate Polly into Julia | Open | ||
| Eliminate run-time bounds checks | Open | ||
| - Reconsider unreachables in post-dominance tree | Open | ||
| - Actually eliminate statements | Done | ||
| Improved Optimizations in Polly | |||
| Task | Status | Owner | |
| Multi-level tiling | Open | ||
| Register Tiling | Open | ||
| Full/partial tile separation for vectorization | Done | ||
| Loop interchange after vectorization to maximize stride-one accesses | Open | ||
Phase 3 - Improve Robustness, Interoperability and Optimizations (ongoing)
| Frontend | |||
|---|---|---|---|
| Task | Status | Owner | |
| Non-affine access functions | Done, needs testing | Marcello | |
| Variable-size multi-dimensional arrays | Done | Sebastian | |
| Derive information for the SCoP context | Open | ||
| Finer grained statements | Open | ||
| Detect reductions | Done | Johannes | |
| Generate code for reductions | in progress | Johannes | |
| Assume static sized arrays are only accessed in-bounds | Done | Tobias | |
| Optimizer | |||
| Task | Status | Owner | |
| Polyhedral dead code elimination | Done | ||
| Back End | |||
| Task | Status | Owner | |
| OpenMP code generation support in isl backend (requirement to drop CLooG) | Done | Tobias | |
| Run-time alias checks | Done | Johannes | |
| Allow optimizers to change memory access functions | Done | Johannes | |
| Make code generation independent of the clast | Done | ||
| General | |||
| Task | Status | Owner | |
| Teach bugpoint to extract regions | Open | ||
| Add Polybench 3.2 to the LLVM test suite | Done | ||
| Build against an installed LLVM | Done | ||
| Setup buildbot regression testers using LNT | Done | Tobias | |
Polly as a LLVM Project (Finished February 2012)
| Task | Status | Owner |
|---|---|---|
| Move to LLVM SVN | https://llvm.org/svn/llvm-project/polly | Tobias |
| Commit mails | llvm-commits@lists.llvm.org | Tobias |
| LLVM Bugzilla category |
LLVM Bugzilla
(Product is 'Projects', Component is 'Polly') | Tobias |
| Website | https://polly.llvm.org | Tobias |
| Buildbot that runs 'make polly-test' | Buildbot | Tobias, Andreas |
Phase 2 - First Optimizations and Enhanced User Experience (Finished February 2012)
First optimizations to show the usefulness of Polly and enhance the user experience. We also try to increase the amount of code we can optimize.
| Frontend | |||
|---|---|---|---|
| Task | Status | Owner | |
| Allow parameters in access functions | Done | Tobias | |
| Improved Scalar Evolution parsing | Done | Tobias | |
| (Graphical) user feedback on Scop Detection | Done | Tobias | |
| Optimizer | |||
| Task | Status | Owner | |
| Dependency Analysis | Done | Tobias | |
| Optimizer - Connect Pluto (through PoCC) | Done | Tobias | |
| Optimizer - Add ISL internal Pluto like optimizer | Done | Tobias | |
| Import/Export - SCoPLib 0.2 (needed for PoCC) | Done | Tobias | |
| Back End | |||
| Task | Status | Owner | |
| SIMD code generation for trivially vectorizable loops | Done | Tobias | |
| OpenMP code generation | Done | Raghesh, Tobias | |
| General | |||
| Task | Status | Owner | |
| clang integration | done | Tobias | |
| Commit RegionPass patch upstream | done | Tobias | |
Phase 1 - Get Something Working (Finished October 2010)
Create a minimal version of Polly that can transform an LLVM-IR program to the polyhedral model and back to LLVM-IR. No transformations are performed.
| Front End | |||
|---|---|---|---|
| Task | Status | Owner | |
| Region detection | Done | Ether | |
| Access Functions | Done | John, Ether | |
| Alias sets | Done | Ether | |
| Scalar evolution to affine expression | Done | Ether | |
| SCoP extraction | Done | Tobias, Ether | |
| SCoPs to polyhedral model | Done | Tobias, Ether | |
| Optimizer | |||
| Task | Status | Owner | |
| Define polyhedral description | Done | Tobias | |
| Back End | |||
| Task | Status | Owner | |
| Create LLVM-IR using CLooG | Done | Tobias | |
| General | |||
| Task | Status | Owner | |
| Setup git repositories | Done | Tobias | |
| Add CLooG/isl to build system | Done | Tobias | |