[all-commits] [llvm/llvm-project] a89b65: [AMDGPU] Select VMEM prefetch for llvm.prefetch on...

[Stanislav Mekhanoshin via All-commits]

  Branch: refs/heads/users/rampitec/07-24-_amdgpu_select_vmem_prefetch_for_llvm.prefetch_on_gfx1250
  Home:   https://github.com/llvm/llvm-project
  Commit: a89b650bbb86f8b3393cb801f39c5b0116805c94
      https://github.com/llvm/llvm-project/commit/a89b650bbb86f8b3393cb801f39c5b0116805c94
  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

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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