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Fix a problem in my patch yesterday, causing a miscompilation of 176.gcc 

llvm-svn: 26045
This commit is contained in:
Chris Lattner 2006-02-08 01:20:23 +00:00
parent adeb8fb5a2
commit ddba3289b5
1 changed files with 3 additions and 2 deletions
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5
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -464,7 +464,7 @@ static uint64_t ComputeMaskedNonZeroBits(Value *V, uint64_t Mask,
// (shl X, C1) & C2 == 0 iff (X & C2 >>u C1) == 0 // (shl X, C1) & C2 == 0 iff (X & C2 >>u C1) == 0
if (ConstantUInt *SA = dyn_cast<ConstantUInt>(I->getOperand(1))) if (ConstantUInt *SA = dyn_cast<ConstantUInt>(I->getOperand(1)))
return ComputeMaskedNonZeroBits(I->getOperand(0),Mask >> SA->getValue(), return ComputeMaskedNonZeroBits(I->getOperand(0),Mask >> SA->getValue(),
Depth+1); Depth+1) << SA->getValue();
break; break;
case Instruction::Shr: case Instruction::Shr:
// (ushr X, C1) & C2 == 0 iff (-1 >> C1) & C2 == 0 // (ushr X, C1) & C2 == 0 iff (-1 >> C1) & C2 == 0
@ -472,7 +472,8 @@ static uint64_t ComputeMaskedNonZeroBits(Value *V, uint64_t Mask,
if (I->getType()->isUnsigned()) { if (I->getType()->isUnsigned()) {
Mask <<= SA->getValue(); Mask <<= SA->getValue();
Mask &= I->getType()->getIntegralTypeMask(); Mask &= I->getType()->getIntegralTypeMask();
return ComputeMaskedNonZeroBits(I->getOperand(0), Mask, Depth+1); return ComputeMaskedNonZeroBits(I->getOperand(0), Mask, Depth+1)
>> SA->getValue();
} }
break; break;
} }