[all-commits] [llvm/llvm-project] 56e0b6: [mlir][affine] Fix crash in vectorizeAffineLoopNes...

[Mehdi Amini via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 56e0b6af1d3948fa2ed56149a02707adaa7a4074
      https://github.com/llvm/llvm-project/commit/56e0b6af1d3948fa2ed56149a02707adaa7a4074
  Author: Mehdi Amini <joker.eph at gmail.com>
  Date:   2026-03-04 (Wed, 04 Mar 2026)

  Changed paths:
    M mlir/test/Dialect/Affine/SuperVectorize/vectorize_unsupported.mlir
    M mlir/test/lib/Dialect/Affine/TestVectorizationUtils.cpp

  Log Message:
  -----------
  [mlir][affine] Fix crash in vectorizeAffineLoopNest test utility for reduction loops (#184617)

The test utility function `testVecAffineLoopNest` called
`isLoopParallel` with a `reductions` output parameter, which populates
reduction descriptors when the loop performs a reduction. However, these
descriptors were never added to `strategy.reductionLoops` before calling
`vectorizeAffineLoopNest`. When the vectorizer then processed a loop
with `iter_args`, it found no reduction descriptors in the strategy and
hit an assertion failure.

Fix by registering the reduction loop descriptors in the strategy before
vectorization, matching what the production vectorizer code already does
correctly.

Fixes #128334



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