}
if (BinaryOperator *I = dyn_cast<BinaryOperator>(Val)) {
+ // Cannot look past anything that might overflow.
+ OverflowingBinaryOperator *OBI = dyn_cast<OverflowingBinaryOperator>(Val);
+ if (OBI && !OBI->hasNoUnsignedWrap()) {
+ Scale = 1;
+ Offset = 0;
+ return Val;
+ }
+
if (ConstantInt *RHS = dyn_cast<ConstantInt>(I->getOperand(1))) {
if (I->getOpcode() == Instruction::Shl) {
// This is a value scaled by '1 << the shift amt'.
// This requires TargetData to get the alloca alignment and size information.
if (!TD) return 0;
- // Insist that the amount-to-allocate not overflow.
- OverflowingBinaryOperator *OBI =
- dyn_cast<OverflowingBinaryOperator>(AI.getOperand(0));
- if (OBI && !(OBI->hasNoSignedWrap() || OBI->hasNoUnsignedWrap())) return 0;
-
const PointerType *PTy = cast<PointerType>(CI.getType());
BuilderTy AllocaBuilder(*Builder);