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| author | Craig Topper <craig.topper@intel.com> | 2018-05-03 05:48:49 +0000 |
|---|---|---|
| committer | Craig Topper <craig.topper@intel.com> | 2018-05-03 05:48:49 +0000 |
| commit | 856fd686908aac7edb37f1013874cb79c84de5bc (patch) | |
| tree | 1c1e08c22c2e6ad5456d83bbf2caa837f0e74c3f /llvm/lib/Transforms | |
| parent | a0cba89f861da4cba80c28a1d3cf30c8e0fb436e (diff) | |
| download | bcm5719-llvm-856fd686908aac7edb37f1013874cb79c84de5bc.tar.gz bcm5719-llvm-856fd686908aac7edb37f1013874cb79c84de5bc.zip | |
[LoopIdiomRecognize] When looking for 'x & (x -1)' for popcnt, make sure the left hand side of the 'and' matches the left hand side of the 'subtract'
llvm-svn: 331437
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp b/llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp index fc64058fd4a..59753579bc3 100644 --- a/llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp +++ b/llvm/lib/Transforms/Scalar/LoopIdiomRecognize.cpp @@ -1196,7 +1196,7 @@ static bool detectPopcountIdiom(Loop *CurLoop, BasicBlock *PreCondBB, VarX1 = DefX2->getOperand(0); SubOneOp = dyn_cast<BinaryOperator>(DefX2->getOperand(1)); } - if (!SubOneOp) + if (!SubOneOp || SubOneOp->getOperand(0) != VarX1) return false; ConstantInt *Dec = dyn_cast<ConstantInt>(SubOneOp->getOperand(1)); |
