[all-commits] [llvm/llvm-project] e0217e: [DAG] canCreateUndefOrPoison - only compute extrac...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e0217ee7829cf49bc0caa8b814f6acc4c4b0836d
      https://github.com/llvm/llvm-project/commit/e0217ee7829cf49bc0caa8b814f6acc4c4b0836d
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-05-19 (Sun, 19 May 2024)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    A llvm/test/CodeGen/X86/pr92569.ll

  Log Message:
  -----------
  [DAG] canCreateUndefOrPoison - only compute extract/index vector elt index knownbits when not poison

We were calling computeKnownBits to determine the bounds of the element index without ensuring that it wasn't poison, meaning if we did freeze the index, isGuaranteedNotToBeUndefOrPoison would then fail as we can't call computeKnownBits through FREEZE for potentially poison values.

Fixes #92569



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