[all-commits] [llvm/llvm-project] 3fa3e0: [X86] canCreateUndefOrPoisonForTargetNode/isGuaran...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 3fa3e09bdc568db733cf85d020e02e6a8fa0c97f
      https://github.com/llvm/llvm-project/commit/3fa3e09bdc568db733cf85d020e02e6a8fa0c97f
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-09-26 (Fri, 26 Sep 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/vector-shuffle-combining-avx.ll

  Log Message:
  -----------
  [X86] canCreateUndefOrPoisonForTargetNode/isGuaranteedNotToBeUndefOrPoisonForTargetNode - add X86ISD::VPERMILPV handling (#160849)

X86ISD::VPERMILPV shuffles can't create undef/poison itself, allowing us to fold freeze(vpermilps(x,y)) -> vpermilps(freeze(x),freeze(y))



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