================
@@ -1482,6 +1482,20 @@ Constant *llvm::ConstantFoldCastOperand(unsigned Opcode,
Constant *C,
switch (Opcode) {
default:
llvm_unreachable("Missing case");
+ case Instruction::PtrToAddr:
+ if (auto *GEP = dyn_cast<GEPOperator>(C)) {
+ // For now just handle the basic case of GEPs on NULL for ptrtoaddr.
+ // (ptrtoaddr (gep null, x)) -> x
+ // (ptrtoaddr (gep (gep null, x), y) -> x + y, etc.
+ unsigned BitWidth = DL.getIndexTypeSizeInBits(GEP->getType());
+ APInt BaseOffset(BitWidth, 0);
+ auto *Base = cast<Constant>(GEP->stripAndAccumulateConstantOffsets(
+ DL, BaseOffset, /*AllowNonInbounds=*/true));
+ if (Base->isNullValue()) {
+ return ConstantInt::get(C->getContext(), BaseOffset);
+ }
+ }
----------------
nikic wrote:
I think this code is untested? Probably best to leave it for a followup.
https://github.com/llvm/llvm-project/pull/139357
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