[all-commits] [llvm/llvm-project] 89ca3e: [CostModel][X86] Reduce worst case v8i16/v16i8 SSE...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 89ca3e72ca03efbbfb5ae9b1c71d81f2d1753521
      https://github.com/llvm/llvm-project/commit/89ca3e72ca03efbbfb5ae9b1c71d81f2d1753521
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-01-29 (Wed, 29 Jan 2025)

  Changed paths:
    M llvm/lib/Target/X86/X86TargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/X86/reduce-xor.ll
    M llvm/test/Analysis/CostModel/X86/reduction.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-extract_subvector.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-insert_subvector.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-single-src.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-transpose.ll
    M llvm/test/Analysis/CostModel/X86/shuffle-two-src.ll
    M llvm/test/Analysis/CostModel/X86/vector-insert-inseltpoison.ll
    M llvm/test/Analysis/CostModel/X86/vector-insert-value.ll
    M llvm/test/Analysis/CostModel/X86/vector-insert.ll
    M llvm/test/Transforms/PhaseOrdering/X86/hadd.ll
    M llvm/test/Transforms/PhaseOrdering/X86/hsub.ll
    M llvm/test/Transforms/SLPVectorizer/X86/load-partial-vector-shuffle.ll
    M llvm/test/Transforms/VectorCombine/X86/extract-cmp-binop.ll

  Log Message:
  -----------
  [CostModel][X86] Reduce worst case v8i16/v16i8 SSE2 shuffle costs (#124789)

These were based off instruction count, not throughput - we can probably improve these further, but these throughput numbers match the worse expanded shuffles we see in the vector-shuffle-128-v* codegen tests.



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