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Implement some minor review feedback.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35373 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-03-26 23:58:26 +00:00
parent fecaf1a2b6
commit 6eb0d99f5f
1 changed files with 3 additions and 3 deletions
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6
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -2455,7 +2455,7 @@ Instruction *InstCombiner::visitUDiv(BinaryOperator &I) {
// Check to see if this is an unsigned division with an exact power of 2,
// if so, convert to a right shift.
if (ConstantInt *C = dyn_cast<ConstantInt>(Op1)) {
if (!C->isZero() && C->getValue().isPowerOf2()) // Don't break X / 0
if (C->getValue().isPowerOf2()) // 0 not included in isPowerOf2
return BinaryOperator::createLShr(Op0,
ConstantInt::get(Op0->getType(), C->getValue().logBase2()));
}
@ -3149,7 +3149,7 @@ Value *InstCombiner::FoldLogicalPlusAnd(Value *LHS, Value *RHS,
// If the AndRHS is a power of two minus one (0+1+), and N&Mask == 0
if ((Mask->getValue().countLeadingZeros() +
Mask->getValue().countPopulation()) == Mask->getValue().getBitWidth()
&& And(N, Mask)->isNullValue())
&& And(N, Mask)->isZero())
break;
return 0;
}
@ -3180,7 +3180,7 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
APInt KnownZero(BitWidth, 0), KnownOne(BitWidth, 0);
if (SimplifyDemandedBits(&I, APInt::getAllOnesValue(BitWidth),
KnownZero, KnownOne))
return &I;
return &I;
} else {
if (ConstantVector *CP = dyn_cast<ConstantVector>(Op1)) {
if (CP->isAllOnesValue())