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Simplify ConstantExpr::getInBoundsGetElementPtr and fix a possible crash, if

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constant folding eliminated the GEP instruction.
 - clang was hitting this on its test suite (for x86_64, at least).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78698 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2009-08-11 18:28:09 +00:00
parent 3603d7a352
commit 3524bd7551
1 changed files with 5 additions and 8 deletions
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13
lib/VMCore/Constants.cpp
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@ -1442,14 +1442,11 @@ Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
Value* const *Idxs,
unsigned NumIdx) {
// Get the result type of the getelementptr!
const Type *Ty =
GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
assert(Ty && "GEP indices invalid!");
unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
Constant *Result = getGetElementPtrTy(PointerType::get(Ty, As), C,
Idxs, NumIdx);
cast<GEPOperator>(Result)->setIsInBounds(true);
Constant *Result = getGetElementPtr(C, Idxs, NumIdx);
// Set in bounds attribute, assuming constant folding didn't eliminate the
// GEP.
if (GEPOperator *GEP = dyn_cast<GEPOperator>(Result))
GEP->setIsInBounds(true);
return Result;
}