}
}
+ if (!TD)
+ return 0;
+
/// See if we can simplify:
/// X = bitcast A* to B*
/// Y = gep X, <...constant indices...>
/// into a gep of the original struct. This is important for SROA and alias
/// analysis of unions. If "A" is also a bitcast, wait for A/X to be merged.
if (BitCastInst *BCI = dyn_cast<BitCastInst>(PtrOp)) {
- APInt Offset(TD ? TD->getPointerSizeInBits() : 1, 0);
- if (TD &&
- !isa<BitCastInst>(BCI->getOperand(0)) &&
+ Value *Operand = BCI->getOperand(0);
+ PointerType *OpType = cast<PointerType>(Operand->getType());
+ unsigned OffsetBits = TD->getPointerSizeInBits();
+ APInt Offset(OffsetBits, 0);
+ if (!isa<BitCastInst>(Operand) &&
GEP.accumulateConstantOffset(*TD, Offset) &&
StrippedPtrTy->getAddressSpace() == GEP.getPointerAddressSpace()) {
if (!Offset) {
// If the bitcast is of an allocation, and the allocation will be
// converted to match the type of the cast, don't touch this.
- if (isa<AllocaInst>(BCI->getOperand(0)) ||
- isAllocationFn(BCI->getOperand(0), TLI)) {
+ if (isa<AllocaInst>(Operand) || isAllocationFn(Operand, TLI)) {
// See if the bitcast simplifies, if so, don't nuke this GEP yet.
if (Instruction *I = visitBitCast(*BCI)) {
if (I != BCI) {
return &GEP;
}
}
- return new BitCastInst(BCI->getOperand(0), GEP.getType());
+ return new BitCastInst(Operand, GEP.getType());
}
// Otherwise, if the offset is non-zero, we need to find out if there is a
// field at Offset in 'A's type. If so, we can pull the cast through the
// GEP.
SmallVector<Value*, 8> NewIndices;
- Type *InTy = BCI->getOperand(0)->getType()->getPointerElementType();
+ Type *InTy = OpType->getElementType();
if (FindElementAtOffset(InTy, Offset.getSExtValue(), NewIndices)) {
Value *NGEP = GEP.isInBounds() ?
- Builder->CreateInBoundsGEP(BCI->getOperand(0), NewIndices) :
- Builder->CreateGEP(BCI->getOperand(0), NewIndices);
+ Builder->CreateInBoundsGEP(Operand, NewIndices) :
+ Builder->CreateGEP(Operand, NewIndices);
if (NGEP->getType() == GEP.getType())
return ReplaceInstUsesWith(GEP, NGEP);
return 0;
}
-
-
static bool
isAllocSiteRemovable(Instruction *AI, SmallVectorImpl<WeakVH> &Users,
const TargetLibraryInfo *TLI) {