[all-commits] [llvm/llvm-project] ff93ca: [VectorCombine] Combine scalar fneg with insert/ex...

[hanbeom via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ff93ca7d6c487108a65d3ad15c3392235fd9c190
      https://github.com/llvm/llvm-project/commit/ff93ca7d6c487108a65d3ad15c3392235fd9c190
  Author: hanbeom <kese111 at gmail.com>
  Date:   2024-12-20 (Fri, 20 Dec 2024)

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

  Log Message:
  -----------
  [VectorCombine] Combine scalar fneg with insert/extract to vector fneg when length is different (#120461)

insertelt DestVec, (fneg (extractelt SrcVec, Index)), Index
-> shuffle DestVec, (shuffle (fneg SrcVec), poison, SrcMask), Mask

Original combining left the combine between vectors of different lengths as a TODO. this commit do that. (see
#[https://github.com/llvm/llvm-project/commit/baab4aa1ba5f68634b4936375e19c8686b1b474a])



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