[all-commits] [llvm/llvm-project] 173c68: [AMDGPU] Enable unaligned scratch accesses (#110219)

[Fabian Ritter via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 173c68239d1d11f4e36c8af07a28310da67568a7
      https://github.com/llvm/llvm-project/commit/173c68239d1d11f4e36c8af07a28310da67568a7
  Author: Fabian Ritter <fabian.ritter at amd.com>
  Date:   2024-10-11 (Fri, 11 Oct 2024)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPU.td
    M llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
    M llvm/lib/Target/AMDGPU/GCNSubtarget.h
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/test/CodeGen/AMDGPU/GlobalISel/flat-scratch.ll
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-load-flat.mir
    M llvm/test/CodeGen/AMDGPU/GlobalISel/legalize-load-private.mir
    M llvm/test/CodeGen/AMDGPU/chain-hi-to-lo.ll
    M llvm/test/CodeGen/AMDGPU/flat-address-space.ll
    M llvm/test/CodeGen/AMDGPU/memcpy-crash-issue63986.ll
    M llvm/test/CodeGen/AMDGPU/memcpy-libcall.ll
    M llvm/test/CodeGen/AMDGPU/memcpy-param-combinations.ll
    M llvm/test/CodeGen/AMDGPU/memmove-param-combinations.ll
    M llvm/test/CodeGen/AMDGPU/sdwa-commute.ll
    M llvm/test/CodeGen/AMDGPU/unaligned-load-store.ll

  Log Message:
  -----------
  [AMDGPU] Enable unaligned scratch accesses (#110219)

This allows us to emit wide generic and scratch memory accesses when we
do not have alignment information. In cases where accesses happen to be
properly aligned or where generic accesses do not go to scratch memory,
this improves performance of the generated code by a factor of up to 16x
and reduces code size, especially when lowering memcpy and memmove
intrinsics.

Also: Make the use of the FeatureUnalignedScratchAccess feature more
consistent: FeatureUnalignedScratchAccess and EnableFlatScratch are now
orthogonal, whereas, before, code assumed that the latter implies the
former at some places.

Part of SWDEV-455845.



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