[all-commits] [llvm/llvm-project] 96e5ee: [AMDGPU] Select VMEM prefetch for llvm.prefetch on...

[Stanislav Mekhanoshin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 96e5eed92af267b151c29a95f2c208f2bc0a32b3
      https://github.com/llvm/llvm-project/commit/96e5eed92af267b151c29a95f2c208f2bc0a32b3
  Author: Stanislav Mekhanoshin <Stanislav.Mekhanoshin at amd.com>
  Date:   2025-07-24 (Thu, 24 Jul 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPU.td
    M llvm/lib/Target/AMDGPU/AMDGPUGISel.td
    M llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.h
    M llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.h
    M llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
    M llvm/lib/Target/AMDGPU/FLATInstructions.td
    M llvm/lib/Target/AMDGPU/GCNSubtarget.h
    M llvm/lib/Target/AMDGPU/SIDefines.h
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/lib/Target/AMDGPU/SMInstructions.td
    M llvm/test/CodeGen/AMDGPU/llvm.prefetch.ll
    M llvm/test/CodeGen/AMDGPU/loop-prefetch-data.ll

  Log Message:
  -----------
  [AMDGPU] Select VMEM prefetch for llvm.prefetch on gfx1250 (#150493)

We have a choice to use a scalar or vector prefetch for an uniform
pointer. Since we do not have scalar stores our scalar cache is
practically readonly. The rw argument of the prefetch intrinsic is
used to force vector operation even for an uniform case. On GFX12
scalar prefetch will be used anyway, it is still useful but it will
only bring data to L2.



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