[all-commits] [llvm/llvm-project] 18627e: Revert "[SLP] Emit reduction instead of 2 extracts...

[Alex Bradbury via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 18627e995c361124087480c199169e2ce000ad49
      https://github.com/llvm/llvm-project/commit/18627e995c361124087480c199169e2ce000ad49
  Author: Alex Bradbury <asb at igalia.com>
  Date:   2025-07-10 (Thu, 10 Jul 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    M llvm/test/Transforms/SLPVectorizer/AArch64/commute.ll
    M llvm/test/Transforms/SLPVectorizer/AArch64/reduce-fadd.ll
    M llvm/test/Transforms/SLPVectorizer/AArch64/slp-fma-loss.ll
    M llvm/test/Transforms/SLPVectorizer/RISCV/revec.ll
    M llvm/test/Transforms/SLPVectorizer/RISCV/vec3-base.ll
    M llvm/test/Transforms/SLPVectorizer/X86/dot-product.ll
    M llvm/test/Transforms/SLPVectorizer/extracts-with-undefs.ll

  Log Message:
  -----------
  Revert "[SLP] Emit reduction instead of 2 extracts + scalar op, when vectorizing operands (#147583)"

This reverts commit ac4a38e9bd573a173432b89cbef7cce7a48e7907.

This breaks the RVV builders
(MicroBenchmarks/ImageProcessing/Blur/blur.test and
MultiSource/Benchmarks/tramp3d-v4/tramp3d-v4.test from llvm-test-suite)
and reportedly SPEC Accel2023
<https://github.com/llvm/llvm-project/pull/147583#issuecomment-3057183138>.



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