[all-commits] [llvm/llvm-project] e8be73: [VPlan] Remove redundant ExtractLastElement from v...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e8be733a3c3347207c162fc83e8dbe02dad2a952
      https://github.com/llvm/llvm-project/commit/e8be733a3c3347207c162fc83e8dbe02dad2a952
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2025-06-20 (Fri, 20 Jun 2025)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/VPlanPatternMatch.h
    M llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
    M llvm/test/Transforms/LoopVectorize/AArch64/vplan-printing.ll

  Log Message:
  -----------
  [VPlan] Remove redundant ExtractLastElement from vector-to-scalar VPI.

Recipes that are vector-to-scalar are guaranteed to generate a scalar
value, so the extract is redundant after VPlan unrolling. Remove it.

This removes unneeded ExtractLastElement VPInstruction of reduction
result computations.



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