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| author | David Majnemer <david.majnemer@gmail.com> | 2014-11-22 04:52:55 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2014-11-22 04:52:55 +0000 |
| commit | 80c8f627db8c56c5abc7627bc13ace99624c5e63 (patch) | |
| tree | 8d759e4a1a3e0927b7e3a59bd83f4de26ca3216e /llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp | |
| parent | fd4a6d2b7aa6fc16f5722ae840867b92ed9c981b (diff) | |
| download | llvm-80c8f627db8c56c5abc7627bc13ace99624c5e63.zip llvm-80c8f627db8c56c5abc7627bc13ace99624c5e63.tar.gz llvm-80c8f627db8c56c5abc7627bc13ace99624c5e63.tar.bz2 | |
InstCombine: Preserve nsw when folding X*(2^C) -> X << C
llvm-svn: 222606
Diffstat (limited to 'llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp index 7844223..5ea25bf 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp @@ -179,6 +179,8 @@ Instruction *InstCombiner::visitMul(BinaryOperator &I) { if (I.hasNoUnsignedWrap()) Shl->setHasNoUnsignedWrap(); + if (I.hasNoSignedWrap() && NewCst->isNotMinSignedValue()) + Shl->setHasNoSignedWrap(); return Shl; } |