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Fix bug: InstCombine/2005-05-07-UDivSelectCrash.ll
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21152 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1068,23 +1068,25 @@ Instruction *InstCombiner::visitDiv(BinaryOperator &I) {
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I.setOperand(1, SFO);
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return &I;
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} else if (SFO->getValue() == 0) {
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I.setOperand(1, STO);
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I.setOperand(2, STO);
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return &I;
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}
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if (uint64_t TSA = Log2(STO->getValue()))
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if (uint64_t FSA = Log2(SFO->getValue())) {
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Constant *TC = ConstantUInt::get(Type::UByteTy, TSA);
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Instruction *TSI = new ShiftInst(Instruction::Shr, Op0,
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TC, SI->getName()+".t");
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TSI = InsertNewInstBefore(TSI, I);
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Constant *FC = ConstantUInt::get(Type::UByteTy, FSA);
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Instruction *FSI = new ShiftInst(Instruction::Shr, Op0,
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FC, SI->getName()+".f");
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FSI = InsertNewInstBefore(FSI, I);
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return new SelectInst(SI->getOperand(0), TSI, FSI);
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}
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uint64_t TVA = STO->getValue(), FVA = SFO->getValue();
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unsigned TSA = 0, FSA = 0;
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if ((TVA == 1 || (TSA = Log2(TVA))) && // Log2 fails for 0 & 1.
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(FVA == 1 || (FSA = Log2(FVA)))) {
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Constant *TC = ConstantUInt::get(Type::UByteTy, TSA);
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Instruction *TSI = new ShiftInst(Instruction::Shr, Op0,
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TC, SI->getName()+".t");
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TSI = InsertNewInstBefore(TSI, I);
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Constant *FC = ConstantUInt::get(Type::UByteTy, FSA);
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Instruction *FSI = new ShiftInst(Instruction::Shr, Op0,
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FC, SI->getName()+".f");
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FSI = InsertNewInstBefore(FSI, I);
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return new SelectInst(SI->getOperand(0), TSI, FSI);
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}
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}
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// 0 / X == 0, we don't need to preserve faults!
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