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| author | Nadav Rotem <nrotem@apple.com> | 2012-10-20 20:45:01 +0000 |
|---|---|---|
| committer | Nadav Rotem <nrotem@apple.com> | 2012-10-20 20:45:01 +0000 |
| commit | ccaccfa8bf070b169847109513610cf41abfd1f3 (patch) | |
| tree | 81157fa84d2bbb85339e89e44d17d5d848543c36 /lib/Transforms/Vectorize/LoopVectorize.cpp | |
| parent | b8f2d82403bd059d26c091ec1ad3512033074546 (diff) | |
| download | external_llvm-ccaccfa8bf070b169847109513610cf41abfd1f3.zip external_llvm-ccaccfa8bf070b169847109513610cf41abfd1f3.tar.gz external_llvm-ccaccfa8bf070b169847109513610cf41abfd1f3.tar.bz2 | |
Fix an infinite loop in the loop-vectorizer.
PR14134.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166379 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Vectorize/LoopVectorize.cpp')
| -rw-r--r-- | lib/Transforms/Vectorize/LoopVectorize.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp index c11c66f..027fe06 100644 --- a/lib/Transforms/Vectorize/LoopVectorize.cpp +++ b/lib/Transforms/Vectorize/LoopVectorize.cpp @@ -1175,6 +1175,12 @@ bool LoopVectorizationLegality::AddReductionVar(PHINode *Phi, bool FoundInBlockUser = false; // Did we reach the initial PHI node ? bool FoundStartPHI = false; + + // If the instruction has no users then this is a broken + // chain and can't be a reduction variable. + if (Iter->use_begin() == Iter->use_end()) + return false; + // For each of the *users* of iter. for (Value::use_iterator it = Iter->use_begin(), e = Iter->use_end(); it != e; ++it) { |