[all-commits] [llvm/llvm-project] c5fe07: AMDGPU: Use freeze poison instead of undef in allo...

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c5fe075eaf92edf31f7b73d38fc59bf56bf4f3bb
      https://github.com/llvm/llvm-project/commit/c5fe075eaf92edf31f7b73d38fc59bf56bf4f3bb
  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 (#131285)

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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