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Fix InstCombine/2007-05-04-Crash.ll and PR1384

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36775 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-05-05 01:59:31 +00:00
parent 51e04da381
commit c42e226f08
1 changed files with 14 additions and 10 deletions
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24
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -6404,21 +6404,25 @@ Instruction *InstCombiner::commonPointerCastTransforms(CastInst &CI) {
if (GEPIdxTy->isSized()) {
SmallVector<Value*, 8> NewIndices;
// Start with the index over the outer type.
// Start with the index over the outer type. Note that the type size
// might be zero (even if the offset isn't zero) if the indexed type
// is something like [0 x {int, int}]
const Type *IntPtrTy = TD->getIntPtrType();
int64_t TySize = TD->getTypeSize(GEPIdxTy);
int64_t FirstIdx = Offset/TySize;
Offset %= TySize;
int64_t FirstIdx = 0;
if (int64_t TySize = TD->getTypeSize(GEPIdxTy)) {
FirstIdx = Offset/TySize;
Offset %= TySize;
// Handle silly modulus not returning values values [0..TySize).
if (Offset < 0) {
--FirstIdx;
Offset += TySize;
assert(Offset >= 0);
// Handle silly modulus not returning values values [0..TySize).
if (Offset < 0) {
--FirstIdx;
Offset += TySize;
assert(Offset >= 0);
}
assert((uint64_t)Offset < (uint64_t)TySize && "Out of range offset");
}
NewIndices.push_back(ConstantInt::get(IntPtrTy, FirstIdx));
assert((uint64_t)Offset < (uint64_t)TySize && "Out of range offset");
// Index into the types. If we fail, set OrigBase to null.
while (Offset) {