[all-commits] [llvm/llvm-project] dc3d1a: [SLP]Fix APInt assertion in emitReusedOps for narr...

[Alexey Bataev via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: dc3d1a84aee26d1b23645f575d0e3e9130891a02
      https://github.com/llvm/llvm-project/commit/dc3d1a84aee26d1b23645f575d0e3e9130891a02
  Author: Alexey Bataev <a.bataev at outlook.com>
  Date:   2026-09-22 (Tue, 22 Sep 2026)

  Changed paths:
    M llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
    A llvm/test/Transforms/SLPVectorizer/X86/reduction-same-vals-i1.ll

  Log Message:
  -----------
  [SLP]Fix APInt assertion in emitReusedOps for narrow types

The repeat count of a reused scalar may not fit the reduction element
type (e.g. count 2 in i1), tripping the APInt isUIntN assertion when
building the to-mul scale constant. Truncate the count to the element
bitwidth; the modular reduction arithmetic keeps the result equivalent.

Fixes #225279

Reviewers: 

Pull Request: https://github.com/llvm/llvm-project/pull/225376



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