[PATCH] D110226: [InstCombine] Update InstcombineCast to use poison instead of undef for shufflevector's placeholder (1/4)

[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.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D110226

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
  llvm/test/Transforms/InstCombine/X86/x86-f16c-inseltpoison.ll
  llvm/test/Transforms/InstCombine/X86/x86-f16c.ll
  llvm/test/Transforms/InstCombine/cast.ll
  llvm/test/Transforms/InstCombine/shuffle-cast-dist.ll
  llvm/test/Transforms/InstCombine/shufflevec-bitcast-inseltpoison.ll
  llvm/test/Transforms/InstCombine/shufflevec-bitcast.ll
  llvm/test/Transforms/InstCombine/trunc-inseltpoison.ll
  llvm/test/Transforms/InstCombine/trunc.ll
  llvm/test/Transforms/InstCombine/vector-casts.ll

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