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| author | Chris Lattner <sabre@nondot.org> | 2009-06-21 01:15:55 +0000 |
|---|---|---|
| committer | Chris Lattner <sabre@nondot.org> | 2009-06-21 01:15:55 +0000 |
| commit | 62fdd112fc755999175be9582eab5dac6ecba088 (patch) | |
| tree | 1afec39aadaefaf8545dac0a2109b557214cab6c /llvm/lib/VMCore/ConstantFold.cpp | |
| parent | 7d2b0494046e62619739b5ffeca84e0bc614ead0 (diff) | |
| download | bcm5719-llvm-62fdd112fc755999175be9582eab5dac6ecba088.tar.gz bcm5719-llvm-62fdd112fc755999175be9582eab5dac6ecba088.zip | |
implement PR4424: 0/x is always 0 for integer division.
llvm-svn: 73835
Diffstat (limited to 'llvm/lib/VMCore/ConstantFold.cpp')
| -rw-r--r-- | llvm/lib/VMCore/ConstantFold.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/llvm/lib/VMCore/ConstantFold.cpp b/llvm/lib/VMCore/ConstantFold.cpp index 6c392145a50..dc8fb39f173 100644 --- a/llvm/lib/VMCore/ConstantFold.cpp +++ b/llvm/lib/VMCore/ConstantFold.cpp @@ -773,6 +773,13 @@ Constant *llvm::ConstantFoldBinaryInstruction(unsigned Opcode, } } } + + // 0 / x -> 0. + if ((Opcode == Instruction::UDiv || + Opcode == Instruction::SDiv) && + CI1->isZero()) + return const_cast<Constant*>(C1); + } else if (const ConstantFP *CFP1 = dyn_cast<ConstantFP>(C1)) { if (const ConstantFP *CFP2 = dyn_cast<ConstantFP>(C2)) { APFloat C1V = CFP1->getValueAPF(); |
