[PATCH] D15580: [SLPVectorizer] Ensure dominated reduction values.

[Charlie Turner via llvm-commits]

chatur01 created this revision.
chatur01 added reviewers: nadav, materi.
chatur01 added a subscriber: llvm-commits.
chatur01 set the repository for this revision to rL LLVM.

```
    When considering incoming values as part of a reduction phi, ensure the
    incoming value is dominated by said phi.
    
    Failing to ensure this property causes miscompiles.
    
    Fixes PR25787.
    
    Many thanks to Mattias Eriksson for reporting, reducing and analyzing the
    problem for me.
```

Repository:
  rL LLVM

http://reviews.llvm.org/D15580

Files:
  lib/Transforms/Vectorize/SLPVectorizer.cpp
  test/Transforms/SLPVectorizer/AArch64/pr25787.ll

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