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Simplify this code, and use an in-bounds GEP.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78755 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-08-12 00:32:55 +00:00
parent 9f817031f1
commit c752064894
1 changed files with 7 additions and 5 deletions
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12
lib/VMCore/ConstantFold.cpp
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@ -103,26 +103,28 @@ static Constant *FoldBitCast(LLVMContext &Context,
if (const PointerType *DPTy = dyn_cast<PointerType>(DestTy))
if (PTy->getAddressSpace() == DPTy->getAddressSpace()) {
SmallVector<Value*, 8> IdxList;
IdxList.push_back(Constant::getNullValue(Type::Int32Ty));
Value *Zero = Constant::getNullValue(Type::Int32Ty);
IdxList.push_back(Zero);
const Type *ElTy = PTy->getElementType();
while (ElTy != DPTy->getElementType()) {
if (const StructType *STy = dyn_cast<StructType>(ElTy)) {
if (STy->getNumElements() == 0) break;
ElTy = STy->getElementType(0);
IdxList.push_back(Constant::getNullValue(Type::Int32Ty));
IdxList.push_back(Zero);
} else if (const SequentialType *STy =
dyn_cast<SequentialType>(ElTy)) {
if (isa<PointerType>(ElTy)) break; // Can't index into pointers!
ElTy = STy->getElementType();
IdxList.push_back(IdxList[0]);
IdxList.push_back(Zero);
} else {
break;
}
}
if (ElTy == DPTy->getElementType())
return ConstantExpr::getGetElementPtr(V, &IdxList[0],
IdxList.size());
// This GEP is inbounds because all indices are zero.
return ConstantExpr::getInBoundsGetElementPtr(V, &IdxList[0],
IdxList.size());
}
// Handle casts from one vector constant to another. We know that the src