[all-commits] [llvm/llvm-project] 3cf539: [AMDGPU] Combine or remove redundant waitcnts at t...

[Jay Foad via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3cf539fb046457a444e93cefc87cca10cbd3b807
      https://github.com/llvm/llvm-project/commit/3cf539fb046457a444e93cefc87cca10cbd3b807
  Author: Jay Foad <jay.foad at amd.com>
  Date:   2024-04-04 (Thu, 04 Apr 2024)

  Changed paths:
    M llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/divergent-control-flow.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.is.private.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/llvm.amdgcn.is.shared.ll
    M llvm/test/CodeGen/AMDGPU/atomic_optimizations_local_pointer.ll
    M llvm/test/CodeGen/AMDGPU/atomicrmw-expand.ll
    M llvm/test/CodeGen/AMDGPU/cgp-addressing-modes-gfx908.ll
    M llvm/test/CodeGen/AMDGPU/extract-subvector-16bit.ll
    M llvm/test/CodeGen/AMDGPU/function-args.ll
    M llvm/test/CodeGen/AMDGPU/lds-global-non-entry-func.ll
    M llvm/test/CodeGen/AMDGPU/local-atomics-fp.ll
    M llvm/test/CodeGen/AMDGPU/skip-if-dead.ll
    M llvm/test/CodeGen/AMDGPU/transform-block-with-return-to-epilog.ll

  Log Message:
  -----------
  [AMDGPU] Combine or remove redundant waitcnts at the end of each MBB (#87539)

Call generateWaitcnt unconditionally at the end of
SIInsertWaitcnts::insertWaitcntInBlock. Even if we don't need to
generate a new waitcnt instruction it has the effect of combining or
removing redundant waitcnts that were already present. Tests show
various small improvements in waitcnt placement.



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