[all-commits] [llvm/llvm-project] 7161bb: [InsCombine] Fix a few remaining vec transforms to...

[Juneyoung Lee via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 7161bb87c914684562bfb20fec7d60e533150f7a
      https://github.com/llvm/llvm-project/commit/7161bb87c914684562bfb20fec7d60e533150f7a
  Author: Juneyoung Lee <aqjune at gmail.com>
  Date:   2021-05-31 (Mon, 31 May 2021)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
    M llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
    M llvm/lib/Transforms/InstCombine/InstCombineSimplifyDemanded.cpp
    M llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
    M llvm/test/Transforms/InstCombine/X86/x86-pshufb-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/X86/x86-pshufb.ll
    M llvm/test/Transforms/InstCombine/bitcast-vec-canon-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/bitcast-vec-canon.ll
    M llvm/test/Transforms/InstCombine/broadcast-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/broadcast.ll
    M llvm/test/Transforms/InstCombine/canonicalize-vector-extract.ll
    M llvm/test/Transforms/InstCombine/extractelement-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/extractelement.ll
    M llvm/test/Transforms/InstCombine/insert-extract-shuffle-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/insert-extract-shuffle.ll
    M llvm/test/Transforms/InstCombine/masked_intrinsics-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/masked_intrinsics.ll
    M llvm/test/Transforms/LoopVectorize/X86/metadata-enable.ll
    M llvm/test/Transforms/SLPVectorizer/AArch64/getelementptr.ll
    M llvm/test/Transforms/SLPVectorizer/X86/alternate-int-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/alternate-int.ll
    M llvm/test/Transforms/SLPVectorizer/X86/operandorder.ll
    M llvm/test/Transforms/SLPVectorizer/X86/pr46983.ll
    M llvm/test/Transforms/SLPVectorizer/X86/pr47629-inseltpoison.ll
    M llvm/test/Transforms/SLPVectorizer/X86/pr47629.ll

  Log Message:
  -----------
  [InsCombine] Fix a few remaining vec transforms to use poison instead of undef

This is a patch that replaces shufflevector and insertelement's placeholder value with poison.

Underlying motivation is to fix the semantics of shufflevector with undef mask to return poison instead
(D93818)
The consensus has been made in the late 2020 via mailing list as well as the thread in https://bugs.llvm.org/show_bug.cgi?id=44185 .

This patch is a simple syntactic change to the existing code, hence directly pushed as a commit.