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| author | Paul Redmond <paul.redmond@intel.com> | 2013-01-04 22:10:16 +0000 |
|---|---|---|
| committer | Paul Redmond <paul.redmond@intel.com> | 2013-01-04 22:10:16 +0000 |
| commit | 5767d919569f7b4be51c0a13bff24f722625d9f3 (patch) | |
| tree | fdeba97aeb1434f7c6b6adcc693d69a129d2f627 /lib/Transforms/Vectorize/LoopVectorize.cpp | |
| parent | 8cab6edf4fa46d9bd06ff3ce0e1dd4557be58b65 (diff) | |
Do not vectorize loops with subtraction reductions
Since subtraction does not commute the loop vectorizer incorrectly vectorizes
reductions such as x = A[i] - x.
Disabling for now.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171537 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Vectorize/LoopVectorize.cpp')
| -rw-r--r-- | lib/Transforms/Vectorize/LoopVectorize.cpp | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp index 4e508988e3..5e2d7971f8 100644 --- a/lib/Transforms/Vectorize/LoopVectorize.cpp +++ b/lib/Transforms/Vectorize/LoopVectorize.cpp @@ -1986,7 +1986,6 @@ LoopVectorizationLegality::isReductionInstr(Instruction *I, // possibly. return true; case Instruction::Add: - case Instruction::Sub: return Kind == IntegerAdd; case Instruction::Mul: return Kind == IntegerMult; |