[all-commits] [llvm/llvm-project] bddfbe: [VectorCombine] foldShuffleOfShuffles - fold "shuf...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bddfbe748ba5fa4363bb343687841f5f389e38f8
      https://github.com/llvm/llvm-project/commit/bddfbe748ba5fa4363bb343687841f5f389e38f8
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-04-22 (Mon, 22 Apr 2024)

  Changed paths:
    M llvm/include/llvm/IR/PatternMatch.h
    M llvm/lib/Transforms/Vectorize/VectorCombine.cpp
    M llvm/test/Transforms/PhaseOrdering/AArch64/interleavevectorization.ll
    M llvm/test/Transforms/VectorCombine/AArch64/select-shuffle.ll
    M llvm/test/Transforms/VectorCombine/AArch64/shuffletoidentity.ll
    M llvm/test/Transforms/VectorCombine/X86/pr67803.ll
    M llvm/test/Transforms/VectorCombine/X86/shuffle-of-shuffles.ll

  Log Message:
  -----------
  [VectorCombine] foldShuffleOfShuffles - fold "shuffle (shuffle x, undef), (shuffle y, undef)" -> "shuffle x, y" (#88743)

Another step towards cleaning up shuffles that have been split, often across bitcasts between SSE intrinsic.

Strip shuffles entirely if we fold to an identity shuffle.



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