[PATCH] D23814: AMDGPU/SI: Improve SILoadStoreOptimizer and run it before the scheduler

[Tom Stellard via llvm-commits]

tstellarAMD created this revision.
tstellarAMD added a reviewer: arsenm.
tstellarAMD added a subscriber: llvm-commits.
Herald added subscribers: kzhuravl, arsenm.

The SILoadStoreOptimizer can now look ahead more then one instruction when
looking for instructions to merge, which greatly improves the number of
loads/stores that we are able to merge.

Moving the pass before scheduling avoids increasing register pressure after
the scheduler, so that the scheduler's register pressure estimates will be
more accurate.  It also gives more consistent results, since it is no longer
affected by minor scheduling changes.

https://reviews.llvm.org/D23814

Files:
  lib/Target/AMDGPU/AMDGPUTargetMachine.cpp
  lib/Target/AMDGPU/SILoadStoreOptimizer.cpp
  test/CodeGen/AMDGPU/ds_read2_offset_order.ll
  test/CodeGen/AMDGPU/ds_write2.ll
  test/CodeGen/AMDGPU/load-local-i16.ll
  test/CodeGen/AMDGPU/load-local-i32.ll
  test/CodeGen/AMDGPU/local-memory.amdgcn.ll
  test/CodeGen/AMDGPU/si-triv-disjoint-mem-access.ll
  test/CodeGen/AMDGPU/store-v3i64.ll

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