[all-commits] [llvm/llvm-project] 9d4557: [InstCombine] Don't treat undef as poison in deman...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9d4557920f1008b64300928c4696bf22e923f71f
      https://github.com/llvm/llvm-project/commit/9d4557920f1008b64300928c4696bf22e923f71f
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2023-12-19 (Tue, 19 Dec 2023)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
    M llvm/test/Transforms/InstCombine/AMDGPU/amdgcn-demanded-vector-elts-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/AMDGPU/amdgcn-demanded-vector-elts.ll
    M llvm/test/Transforms/InstCombine/X86/clmulqdq.ll
    M llvm/test/Transforms/InstCombine/X86/x86-avx512-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/X86/x86-avx512.ll
    M llvm/test/Transforms/InstCombine/X86/x86-pshufb.ll
    M llvm/test/Transforms/InstCombine/broadcast.ll
    M llvm/test/Transforms/InstCombine/extractelement.ll
    M llvm/test/Transforms/InstCombine/inselt-binop.ll
    M llvm/test/Transforms/InstCombine/insert-extract-shuffle.ll
    M llvm/test/Transforms/InstCombine/pr38984.ll
    M llvm/test/Transforms/InstCombine/shuffle_select.ll
    M llvm/test/Transforms/InstCombine/shufflevector-div-rem.ll
    M llvm/test/Transforms/InstCombine/sub-of-negatible.ll
    M llvm/test/Transforms/InstCombine/vec_demanded_elts.ll
    M llvm/test/Transforms/InstCombine/vec_gep_scalar_arg.ll
    M llvm/test/Transforms/InstCombine/vec_shuffle.ll
    M llvm/test/Transforms/InstCombine/vector-casts-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/vector-casts.ll
    M llvm/test/Transforms/SLPVectorizer/X86/alternate-int.ll
    M llvm/test/Transforms/SLPVectorizer/X86/hadd.ll

  Log Message:
  -----------
  [InstCombine] Don't treat undef as poison in demanded element simplification

We can only set PoisonElts if the element is poison, not if it is
undef.