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Don't try to compute the size of an "array" element if the index is 0:

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the size may be unknown, and is not needed.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4153 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vikram S. Adve 2002-10-13 21:47:44 +00:00
parent d2db6c5236
commit 8e22ead3b4
1 changed files with 3 additions and 4 deletions
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7
lib/Target/TargetData.cpp
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@ -170,11 +170,10 @@ uint64_t TargetData::getIndexedOffset(const Type *ptrTy,
Ty = cast<SequentialType>(Ty)->getElementType();
// Get the array index and the size of each array element.
// Both must be known constants, or this will fail.
// Also, the product needs to be sign-extended from 32 to 64 bits.
int64_t elementSize = (int64_t)getTypeSize(Ty);
// Both must be known constants, or the index shd be 0; else this fails.
int64_t arrayIdx = cast<ConstantSInt>(Idx[CurIDX])->getValue();
Result += (uint64_t)(arrayIdx * elementSize);
Result += arrayIdx == 0? 0
: (uint64_t) (arrayIdx * (int64_t) getTypeSize(Ty));
} else if (const StructType *STy = dyn_cast<const StructType>(Ty)) {
assert(Idx[CurIDX]->getType() == Type::UByteTy && "Illegal struct idx");