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Speed up isCString()

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31206 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2006-10-26 21:48:03 +00:00
parent 38187d6a56
commit abf6345710
1 changed files with 14 additions and 4 deletions
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18
lib/VMCore/Constants.cpp
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@ -1077,11 +1077,21 @@ bool ConstantArray::isString() const {
/// isString) and it ends in a null byte \0 and does not contains any other
/// null bytes except its terminator.
bool ConstantArray::isCString() const {
if (!isString()) return false;
// This is safe because a ConstantArray cannot be a zero array.
for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i)
if (cast<ConstantInt>(getOperand(i))->getZExtValue() == 0)
// Check the element type for sbyte or ubyte...
if (getType()->getElementType() != Type::UByteTy &&
getType()->getElementType() != Type::SByteTy)
return false;
Constant *Zero = Constant::getNullValue(getOperand(0)->getType());
// Last element must be a null.
if (getOperand(getNumOperands()-1) != Zero)
return false;
// Other elements must be non-null integers.
for (unsigned i = 0, e = getNumOperands()-1; i != e; ++i) {
if (!isa<ConstantInt>(getOperand(i)))
return false;
if (getOperand(i) == Zero)
return false;
}
return true;
}