================
@@ -126,6 +126,40 @@ Constant *llvm::ConstantFoldCastInstruction(unsigned opc,
Constant *V,
if (isa<PoisonValue>(V))
return PoisonValue::get(DestTy);
+ if (opc == Instruction::IntToPtr) {
+ // We can't fold inttoptr(0) to ConstantPointerNull without checking the
+ // target data layout. However, since data layout is not available here, we
+ // can't do this.
+ if (V->isZeroValue())
+ return nullptr;
----------------
arichardson wrote:
```suggestion
// Note: We can't fold inttoptr(0) to ConstantPointerNull without checking
// the target data layout since null pointers could also be all-ones.
```
I don't think we need the early return here? Although I guess it's a cheap
check and so might actually be better to have it.
https://github.com/llvm/llvm-project/pull/166667
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