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fold gep undef, ... -> undef

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This comes up many times in perlbmk and probably others.

llvm-svn: 17100
This commit is contained in:
Chris Lattner 2004-10-17 21:54:55 +00:00
parent 795ae57cde
commit c088680a5f
1 changed files with 8 additions and 1 deletions
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9
lib/VMCore/ConstantFolding.cpp
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@ -1011,8 +1011,15 @@ Constant *llvm::ConstantFoldGetElementPtr(const Constant *C,
if (IdxList.size() == 0 ||
(IdxList.size() == 1 && cast<Constant>(IdxList[0])->isNullValue()))
return const_cast<Constant*>(C);
Constant *Idx0 = cast<Constant>(IdxList[0]);
if (isa<UndefValue>(C)) {
const Type *Ty = GetElementPtrInst::getIndexedType(C->getType(), IdxList,
true);
assert(Ty != 0 && "Invalid indices for GEP!");
return UndefValue::get(PointerType::get(Ty));
}
Constant *Idx0 = cast<Constant>(IdxList[0]);
if (C->isNullValue()) {
bool isNull = true;
for (unsigned i = 0, e = IdxList.size(); i != e; ++i)