[all-commits] [llvm/llvm-project] 1878b9: [VectorCombine] isExtractExtractCheap - specify th...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1878b94568e77e51f0bc316ba5a8a6b8994b8daf
      https://github.com/llvm/llvm-project/commit/1878b94568e77e51f0bc316ba5a8a6b8994b8daf
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2024-11-13 (Wed, 13 Nov 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VectorCombine.cpp
    M llvm/test/Transforms/PhaseOrdering/X86/pr50392.ll
    M llvm/test/Transforms/VectorCombine/AArch64/load-extractelement-scalarization.ll
    M llvm/test/Transforms/VectorCombine/X86/extract-binop-inseltpoison.ll
    M llvm/test/Transforms/VectorCombine/X86/extract-binop.ll

  Log Message:
  -----------
  [VectorCombine] isExtractExtractCheap - specify the extract/insert shuffle mask to improve shuffle costs (#114780)

This shuffle mask is so focused, the cost model is very likely to be able to determine a specific (lower) cost



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