[all-commits] [llvm/llvm-project] 94df95: [TTI][X86] getShuffleCosts - for SK_PermuteTwoSrc, ...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 94df95de6bab20930c1a77bc785221ff2f670dba
      https://github.com/llvm/llvm-project/commit/94df95de6bab20930c1a77bc785221ff2f670dba
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-12-01 (Sun, 01 Dec 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86TargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/X86/shuffle-insert_subvector-codesize.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-insert_subvector-latency.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-insert_subvector-sizelatency.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-insert_subvector.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-transpose-codesize.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-transpose-latency.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-transpose-sizelatency.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-transpose.ll
    M llvm/test/Transforms/PhaseOrdering/X86/pr94546.ll

  Log Message:
  -----------
  [TTI][X86] getShuffleCosts - for SK_PermuteTwoSrc, if the masks are known to be "inlane" no need to scale the costs by worst-case legalization (#117999)

SK_PermuteTwoSrc legalization has to assume any of the legalised source registers could be referenced in split shuffles, but if we already know that each 128-bit lane only references elements from the same lane of the source operands, then this scaling won't occur.

Hopefully this can help with #113356 without us having to get full processShuffleMasks canonicalization finished first.



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