[llvm] [ConstantFolding] Support ptrtoaddr in cast folds (PR #162480)

[Hongyu Chen via llvm-commits]

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@@ -1528,7 +1528,8 @@ Constant *llvm::ConstantFoldCastOperand(unsigned Opcode, Constant *C,
                 Sub->getOpcode() == Instruction::Sub &&
                 Sub->getOperand(0)->isNullValue())
               FoldedValue = ConstantExpr::getSub(
-                  ConstantExpr::getPtrToInt(Ptr, IntIdxTy), Sub->getOperand(1));
+                  ConstantExpr::getCast(Opcode, Ptr, IntIdxTy),
+                  Sub->getOperand(1));
           }
         }
       }
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XChy wrote:

The comment below:
> // Do a zext or trunc to get to the ptrtoint dest size.

->

> // Do a zext or trunc to get to the ptrtoint/ptrtoaddr dest size.

https://github.com/llvm/llvm-project/pull/162480