[all-commits] [llvm/llvm-project] fcd086: [X86] canCreateUndefOrPoisonForTargetNode - SSE ve...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fcd086ca272e5758a13f9b4e3f48bb4440e4c2fa
      https://github.com/llvm/llvm-project/commit/fcd086ca272e5758a13f9b4e3f48bb4440e4c2fa
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-05-24 (Fri, 24 May 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/test/CodeGen/X86/freeze-binary.ll

  Log Message:
  -----------
  [X86] canCreateUndefOrPoisonForTargetNode - SSE vector shifts handle out of bounds shift amounts

SHL/SRL are guaranteed to fold to zero, SRA is guaranteed to fold to 'all sign bits'



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