[PATCH] D110230: [InstCombine] Update InstCombine to use poison instead of undef for shufflevector's placeholder (2/3)

[Hyeongyu Kim via Phabricator via llvm-commits]

hyeongyukim created this revision.
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This patch is for fixing potential shufflevector-related bugs like D93818 <https://reviews.llvm.org/D93818>.
As D93818 <https://reviews.llvm.org/D93818>, this patch change shufflevector's default placeholder to poison.
To reduce risk, it was divided into several patches, and this patch is for InstCombineVectorOps.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D110230

Files:
  llvm/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
  llvm/test/Transforms/InstCombine/X86/x86-avx512-inseltpoison.ll
  llvm/test/Transforms/InstCombine/X86/x86-avx512.ll
  llvm/test/Transforms/InstCombine/X86/x86-f16c-inseltpoison.ll
  llvm/test/Transforms/InstCombine/X86/x86-f16c.ll
  llvm/test/Transforms/InstCombine/broadcast-inseltpoison.ll
  llvm/test/Transforms/InstCombine/broadcast.ll
  llvm/test/Transforms/InstCombine/insert-extract-shuffle-inseltpoison.ll
  llvm/test/Transforms/InstCombine/insert-extract-shuffle.ll
  llvm/test/Transforms/InstCombine/obfuscated_splat-inseltpoison.ll
  llvm/test/Transforms/InstCombine/obfuscated_splat.ll
  llvm/test/Transforms/InstCombine/reduction-shufflevector.ll
  llvm/test/Transforms/InstCombine/shuffle-cast-dist.ll
  llvm/test/Transforms/InstCombine/trunc-inseltpoison.ll
  llvm/test/Transforms/InstCombine/trunc.ll
  llvm/test/Transforms/InstCombine/vec_demanded_elts-inseltpoison.ll
  llvm/test/Transforms/InstCombine/vec_demanded_elts.ll
  llvm/test/Transforms/InstCombine/vec_shuffle-inseltpoison.ll
  llvm/test/Transforms/InstCombine/vec_shuffle.ll

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