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No functionality change. Type::isSized() can be expensive, so avoid calling it

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until after other inexpensive tests.

llvm-svn: 152195
This commit is contained in:
Nick Lewycky 2012-03-07 02:27:53 +00:00
parent d0770582f9
commit 7c4db49d7e
1 changed files with 10 additions and 8 deletions
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4
lib/Analysis/ValueTracking.cpp
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@ -106,9 +106,10 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
// The address of an aligned GlobalValue has trailing zeros.
if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
unsigned Align = GV->getAlignment();
if (Align == 0 && TD && GV->getType()->getElementType()->isSized()) {
if (Align == 0 && TD) {
if (GlobalVariable *GVar = dyn_cast<GlobalVariable>(GV)) {
Type *ObjectType = GVar->getType()->getElementType();
if (ObjectType->isSized()) {
// If the object is defined in the current Module, we'll be giving
// it the preferred alignment. Otherwise, we have to assume that it
// may only have the minimum ABI alignment.
@ -118,6 +119,7 @@ void llvm::ComputeMaskedBits(Value *V, const APInt &Mask,
Align = TD->getABITypeAlignment(ObjectType);
}
}
}
if (Align > 0)
KnownZero = Mask & APInt::getLowBitsSet(BitWidth,
CountTrailingZeros_32(Align));