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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 | 1db6866147b6b3028fdc77bc242de8f44edd71d9 (patch) | |
| tree | 5571ed155bd82f9ffc8b4d968e6ba4b0e1145ece /lib/VMCore | |
| parent | 5c0b16d0c40bb95e572e5d24db587ed8ca4bde71 (diff) | |
| download | external_llvm-1db6866147b6b3028fdc77bc242de8f44edd71d9.zip external_llvm-1db6866147b6b3028fdc77bc242de8f44edd71d9.tar.gz external_llvm-1db6866147b6b3028fdc77bc242de8f44edd71d9.tar.bz2 | |
implement PR4424: 0/x is always 0 for integer division.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73835 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/VMCore')
| -rw-r--r-- | lib/VMCore/ConstantFold.cpp | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/VMCore/ConstantFold.cpp b/lib/VMCore/ConstantFold.cpp index 6c39214..dc8fb39 100644 --- a/lib/VMCore/ConstantFold.cpp +++ b/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(); |