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Fix sign-extension: it needs to happen *after* multiplying by type size.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3497 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Vikram S. Adve 2002-08-24 14:44:58 +00:00
parent 42eb2bae8e
commit f519b999a6
1 changed files with 2 additions and 4 deletions
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6
lib/Target/TargetData.cpp
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@ -164,12 +164,10 @@ uint64_t TargetData::getIndexedOffset(const Type *ptrTy,
// Get the array index and the size of each array element.
// Both must be known constants, or this will fail.
// Also, the arrayIdx needs to be sign-extended from 32 bits to uint64_t
// since uint is not normally sign-extended when cast to uint64_t.
// Also, the product needs to be sign-extended from 32 to 64 bits.
uint64_t elementSize = this->getTypeSize(Ty);
uint64_t arrayIdx = cast<ConstantUInt>(Idx[CurIDX])->getValue();
arrayIdx = (uint64_t) (int) arrayIdx; // sign-extend from 32 to 64 bits
Result += arrayIdx * elementSize;
Result += (uint64_t) (int) (arrayIdx * elementSize); // sign-extend
} else if (const StructType *STy = dyn_cast<const StructType>(Ty)) {
assert(Idx[CurIDX]->getType() == Type::UByteTy && "Illegal struct idx");