[all-commits] [llvm/llvm-project] eafbb8: [LoopVectorize] Don't replicate blocks with optsiz...

[John Brawn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: eafbb879f676ccd65fe7efae6b5280ae750ef20a
      https://github.com/llvm/llvm-project/commit/eafbb879f676ccd65fe7efae6b5280ae750ef20a
  Author: John Brawn <john.brawn at arm.com>
  Date:   2025-04-17 (Thu, 17 Apr 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/aarch64-predication.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/conditional-branches-cost.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/optsize_minsize.ll
    M llvm/test/Transforms/LoopVectorize/ARM/optsize_minsize.ll
    M llvm/test/Transforms/LoopVectorize/X86/tail_loop_folding.ll
    M llvm/test/Transforms/LoopVectorize/pr45679-fold-tail-by-masking.ll
    M llvm/test/Transforms/LoopVectorize/struct-return.ll
    M llvm/test/Transforms/LoopVectorize/tail-folding-counting-down.ll
    M llvm/test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge.ll

  Log Message:
  -----------
  [LoopVectorize] Don't replicate blocks with optsize (#129265)

Any VPlan we generate that contains a replicator region will result in
replicated blocks in the output, causing a large code size increase.
Reject such VPlans when optimizing for size, as the code size impact is
usually worse than having a scalar epilogue, which we already forbid
with optsize.

This change requires a lot of test changes. For tests of optsize
specifically I've updated the test with the new output, otherwise the
tests have been adjusted to not rely on optsize.

Fixes #66652



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