[all-commits] [llvm/llvm-project] ec7f8e: [AMDGPU] Add intrinsic for raw atomic buffer loads...

[Jessica Del via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ec7f8e11133ff6cd0370398ee32d684a6f857fcc
      https://github.com/llvm/llvm-project/commit/ec7f8e11133ff6cd0370398ee32d684a6f857fcc
  Author: Jessica Del <50999226+OutOfCache at users.noreply.github.com>
  Date:   2024-07-22 (Mon, 22 Jul 2024)

  Changed paths:
    M llvm/include/llvm/IR/IntrinsicsAMDGPU.td
    M llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp
    M llvm/lib/Target/AMDGPU/AMDGPULowerBufferFatPointers.cpp
    M llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    A llvm/test/CodeGen/AMDGPU/llvm.amdgcn.raw.atomic.buffer.load.ll
    A llvm/test/CodeGen/AMDGPU/llvm.amdgcn.raw.ptr.atomic.buffer.load.ll
    M llvm/test/CodeGen/AMDGPU/lower-buffer-fat-pointers-memops.ll

  Log Message:
  -----------
  [AMDGPU] Add intrinsic for raw atomic buffer loads (#97707)

Upstream the intrinsics `llvm.amdgcn.raw.atomic.buffer.load`
and `llvm.amdgcn.raw.atomic.ptr.buffer.load`.

These additional intrinsics mark atomic buffer loads
as atomic to LLVM by removing the `IntrReadMem`
attribute. Otherwise, it could hoist these
intrinsics out of loops in cases where LLVM marks
them as invariant. That can cause issues such as
infinite loops.

Continuation of https://reviews.llvm.org/D138786
with the additional use in the fat buffer lowering,
more test cases and the additional ptr versions 
of these intrinsics.

---------

Co-authored-by: rtayl <>
Co-authored-by: Jay Foad <jay.foad at amd.com>
Co-authored-by: Mariusz Sikora <mariusz.sikora at amd.com>



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