[all-commits] [llvm/llvm-project] cdff7f: [LV] Retrieve middle VPBB via scalar ph to fix epi...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cdff7f0b6ebe48c7d99079db002855be7716a7a9
      https://github.com/llvm/llvm-project/commit/cdff7f0b6ebe48c7d99079db002855be7716a7a9
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-04-03 (Thu, 03 Apr 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

  Log Message:
  -----------
  [LV] Retrieve middle VPBB via scalar ph to fix epilogue resumephis (NFC)

If ScalarPH has predecessors, we may need to update its reduction resume
values. If there is a middle block, it must be the first predecessor.
Note that the first predecessor may not be the middle block, if the
middle block doesn't branch to the scalar preheader. In that case,
fixReductionScalarResumeWhenVectorizingEpilog will be a no-op.

In preparation for https://github.com/llvm/llvm-project/pull/106748.



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