[all-commits] [llvm/llvm-project] e5aaf0: [InstCombine] Update InstCombine to use poison ins...

[Hyeongyu Kim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e5aaf0332670577cc19ac67b07b10261da6fc1e1
      https://github.com/llvm/llvm-project/commit/e5aaf0332670577cc19ac67b07b10261da6fc1e1
  Author: hyeongyu kim <gusrb406 at snu.ac.kr>
  Date:   2021-09-22 (Wed, 22 Sep 2021)

  Changed paths:
    M clang/test/Headers/wasm.c
    M llvm/lib/Transforms/InstCombine/InstCombineCasts.cpp
    M llvm/test/Transforms/InstCombine/X86/x86-f16c-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/X86/x86-f16c.ll
    M llvm/test/Transforms/InstCombine/cast.ll
    M llvm/test/Transforms/InstCombine/shuffle-cast-dist.ll
    M llvm/test/Transforms/InstCombine/shufflevec-bitcast-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/shufflevec-bitcast.ll
    M llvm/test/Transforms/InstCombine/trunc-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/trunc.ll
    M llvm/test/Transforms/InstCombine/vector-casts.ll

  Log Message:
  -----------
  [InstCombine] Update InstCombine to use poison instead of undef for shufflevector's placeholder (1/3)

This patch is for fixing potential shufflevector-related bugs like D93818.
As D93818, this patch change shufflevector's default placeholder to poison.
To reduce risk, it was divided into several patches, and this patch is for InstCombineCasts.

Reviewed By: spatel

Differential Revision: https://reviews.llvm.org/D110226