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Fix bug: InstCombine/2005-05-07-UDivSelectCrash.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21152 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-04-08 04:03:26 +00:00
parent b37246d65e
commit bf70b838e7
1 changed files with 16 additions and 14 deletions
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30
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1068,23 +1068,25 @@ Instruction *InstCombiner::visitDiv(BinaryOperator &I) {
I.setOperand(1, SFO);
return &I;
} else if (SFO->getValue() == 0) {
I.setOperand(1, STO);
I.setOperand(2, STO);
return &I;
}
if (uint64_t TSA = Log2(STO->getValue()))
if (uint64_t FSA = Log2(SFO->getValue())) {
Constant *TC = ConstantUInt::get(Type::UByteTy, TSA);
Instruction *TSI = new ShiftInst(Instruction::Shr, Op0,
TC, SI->getName()+".t");
TSI = InsertNewInstBefore(TSI, I);
Constant *FC = ConstantUInt::get(Type::UByteTy, FSA);
Instruction *FSI = new ShiftInst(Instruction::Shr, Op0,
FC, SI->getName()+".f");
FSI = InsertNewInstBefore(FSI, I);
return new SelectInst(SI->getOperand(0), TSI, FSI);
}
uint64_t TVA = STO->getValue(), FVA = SFO->getValue();
unsigned TSA = 0, FSA = 0;
if ((TVA == 1 || (TSA = Log2(TVA))) && // Log2 fails for 0 & 1.
(FVA == 1 || (FSA = Log2(FVA)))) {
Constant *TC = ConstantUInt::get(Type::UByteTy, TSA);
Instruction *TSI = new ShiftInst(Instruction::Shr, Op0,
TC, SI->getName()+".t");
TSI = InsertNewInstBefore(TSI, I);
Constant *FC = ConstantUInt::get(Type::UByteTy, FSA);
Instruction *FSI = new ShiftInst(Instruction::Shr, Op0,
FC, SI->getName()+".f");
FSI = InsertNewInstBefore(FSI, I);
return new SelectInst(SI->getOperand(0), TSI, FSI);
}
}
// 0 / X == 0, we don't need to preserve faults!