[all-commits] [llvm/llvm-project] b8b510: AMDGPU: Use freeze poison instead of undef in allo...

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/amdgpu/promote-alloca-use-freeze-poison-instead-of-undef
  Home:   https://github.com/llvm/llvm-project
  Commit: b8b5105fb95e0dd81e4222b157652c2a96f98ca6
      https://github.com/llvm/llvm-project/commit/b8b5105fb95e0dd81e4222b157652c2a96f98ca6
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2025-03-18 (Tue, 18 Mar 2025)

  Changed paths:
    M llvm/lib/Target/AMDGPU/AMDGPUPromoteAlloca.cpp
    M llvm/test/CodeGen/AMDGPU/promote-alloca-array-aggregate.ll
    M llvm/test/CodeGen/AMDGPU/promote-alloca-budget-exhausted.ll
    M llvm/test/CodeGen/AMDGPU/promote-alloca-loadstores.ll
    M llvm/test/CodeGen/AMDGPU/promote-alloca-max-regs.ll
    M llvm/test/CodeGen/AMDGPU/promote-alloca-memset.ll
    M llvm/test/CodeGen/AMDGPU/promote-alloca-multidim.ll
    M llvm/test/CodeGen/AMDGPU/promote-alloca-non-constant-index.ll
    M llvm/test/CodeGen/AMDGPU/promote-alloca-pointer-array.ll
    M llvm/test/CodeGen/AMDGPU/promote-alloca-subvecs.ll
    M llvm/test/CodeGen/AMDGPU/promote-alloca-vector-to-vector.ll
    M llvm/test/CodeGen/AMDGPU/promote-alloca-vgpr-ratio.ll
    M llvm/test/CodeGen/AMDGPU/sdwa-peephole.ll
    M llvm/test/CodeGen/AMDGPU/vector-alloca-bitcast.ll
    M llvm/test/CodeGen/AMDGPU/vector-alloca-limits.ll

  Log Message:
  -----------
  AMDGPU: Use freeze poison instead of undef in alloca promotion

Previously the value created to represent the uninitialized memory
of the alloca was undef. Use freeze poison instead. Enables some
optimization improvements (which need defeating in the limit tests),
but also a few regressions. Seems to leave behind dead code in some
cases too.



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