[all-commits] [llvm/llvm-project] 0e528a: [VPlan] Use start value operand for FindLastIV red...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0e528ac404e13ed2d952a2d83aaf8383293c851e
      https://github.com/llvm/llvm-project/commit/0e528ac404e13ed2d952a2d83aaf8383293c851e
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2024-12-16 (Mon, 16 Dec 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/lib/Transforms/Vectorize/VPlanRecipes.cpp
    M llvm/test/Transforms/LoopVectorize/epilog-iv-select-cmp.ll

  Log Message:
  -----------
  [VPlan] Use start value operand for FindLastIV reduction phis.

Update VPReductionPHIRecipe::execute to use the start value from the
start value operand of the recipe. This is needed to make sure we resume
from the correct value during epilogue vectorization.

At the moment, the start value is set to the sentinel value in
adjustRecipesForReductions, as the original start value needs to be used
when creating ResumePhi recipes.

Fixes a mis-compile introduced by b3cba9be41bfa8 in SPEC2017 on AArch64.



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