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| author | David Majnemer <david.majnemer@gmail.com> | 2014-11-22 20:00:38 +0000 |
|---|---|---|
| committer | David Majnemer <david.majnemer@gmail.com> | 2014-11-22 20:00:38 +0000 |
| commit | ec6e481bc5f77188efeccca73b5eafcc9eb2b663 (patch) | |
| tree | b6ea499b237176be98adf9b9317218682342d24c /llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp | |
| parent | fa4699e65fb7c0986e0839cfcdd9d70fc5434169 (diff) | |
| download | llvm-ec6e481bc5f77188efeccca73b5eafcc9eb2b663.zip llvm-ec6e481bc5f77188efeccca73b5eafcc9eb2b663.tar.gz llvm-ec6e481bc5f77188efeccca73b5eafcc9eb2b663.tar.bz2 | |
InstCombine: Propagate exact for (sdiv X, Y) -> (udiv X, Y)
llvm-svn: 222624
Diffstat (limited to 'llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp index b79f55e..216177f 100644 --- a/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp +++ b/llvm/lib/Transforms/InstCombine/InstCombineMulDivRem.cpp @@ -1097,7 +1097,9 @@ Instruction *InstCombiner::visitSDiv(BinaryOperator &I) { if (MaskedValueIsZero(Op0, Mask, 0, &I)) { if (MaskedValueIsZero(Op1, Mask, 0, &I)) { // X sdiv Y -> X udiv Y, iff X and Y don't have sign bit set - return BinaryOperator::CreateUDiv(Op0, Op1, I.getName()); + auto *BO = BinaryOperator::CreateUDiv(Op0, Op1, I.getName()); + BO->setIsExact(I.isExact()); + return BO; } if (match(Op1, m_Shl(m_Power2(), m_Value()))) { |