[all-commits] [llvm/llvm-project] 30dd12: AMDGPU: Custom expand flat cmpxchg which may acces...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 30dd1297fa2cc172ef7a1435775010d7efd673fd
      https://github.com/llvm/llvm-project/commit/30dd1297fa2cc172ef7a1435775010d7efd673fd
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2024-11-04 (Mon, 04 Nov 2024)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/include/llvm/Transforms/Utils/LowerAtomic.h
    M llvm/lib/CodeGen/AtomicExpandPass.cpp
    M llvm/lib/Target/AMDGPU/SIISelLowering.cpp
    M llvm/lib/Target/AMDGPU/SIISelLowering.h
    M llvm/lib/Transforms/Utils/LowerAtomic.cpp
    M llvm/test/CodeGen/AMDGPU/flat_atomics_i64.ll
    M llvm/test/Transforms/AtomicExpand/AMDGPU/expand-atomicrmw-flat-noalias-addrspace.ll
    M llvm/test/Transforms/AtomicExpand/AMDGPU/expand-atomicrmw-integer-ops-0-to-add-0.ll
    M llvm/test/Transforms/AtomicExpand/AMDGPU/expand-cmpxchg-flat-maybe-private.ll

  Log Message:
  -----------
  AMDGPU: Custom expand flat cmpxchg which may access private (#109410)

64-bit flat cmpxchg instructions do not work correctly for scratch
addresses, and need to be expanded as non-atomic.

Allow custom expansion of cmpxchg in AtomicExpand, as is
already the case for atomicrmw.



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