[all-commits] [llvm/llvm-project] 8d76fb: [VectorCombine] fix crashing on match of non-canon...

[Sanjay Patel via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 8d76fbb5f0659bba47a7f38847550a2bc8bbf0c1
      https://github.com/llvm/llvm-project/commit/8d76fbb5f0659bba47a7f38847550a2bc8bbf0c1
  Author: Sanjay Patel <spatel at rotateright.com>
  Date:   2022-10-17 (Mon, 17 Oct 2022)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VectorCombine.cpp
    M llvm/test/Transforms/VectorCombine/X86/extract-fneg-insert.ll

  Log Message:
  -----------
  [VectorCombine] fix crashing on match of non-canonical fneg

We can't assume that operand 0 is the negated operand because
the matcher handles "fsub -0.0, X" (and also +0.0 with FMF).

By capturing the extract within the match, we avoid the bug
and make the transform more robust (can't assume that this
pass will only see canonical IR).