[all-commits] [llvm/llvm-project] 63d805: LoopVectorize: guard appending InstsToScalarize; f...

[Ramkumar Ramachandra via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 63d8058ef50a3186b6b6a5db254f44673fea3d19
      https://github.com/llvm/llvm-project/commit/63d8058ef50a3186b6b6a5db254f44673fea3d19
  Author: Ramkumar Ramachandra <ram.ramachandra at arm.com>
  Date:   2024-04-18 (Thu, 18 Apr 2024)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
    M llvm/test/Transforms/LoopVectorize/X86/pr55096-scalarize-add.ll

  Log Message:
  -----------
  LoopVectorize: guard appending InstsToScalarize; fix bug (#88720)

In the process of collecting instructions to scalarize, LoopVectorize
uses faulty reasoning whereby it also adds instructions that will be
scalar after vectorization. If an instruction satisfies
isScalarAfterVectorization() for the given VF, it should not be appended
to InstsToScalarize. Add this extra guard, fixing a crash.

Fixes #55096.



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