[clang] [CIR] Preserve address space in base/derived class address casts (PR #230841)

[Steffen Larsen via cfe-commits]

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@@ -3621,6 +3621,26 @@ OpFoldResult cir::NotOp::fold(FoldAdaptor adaptor) {
   return {};
 }
 
+//===----------------------------------------------------------------------===//
+// BaseClassAddrOp & DerivedClassAddrOp
+//===----------------------------------------------------------------------===//
+
+static LogicalResult verifyClassAddrCast(Operation *op, cir::PointerType srcTy,
+                                         cir::PointerType resultTy) {
+  if (srcTy.getAddrSpace() != resultTy.getAddrSpace())
+    return op->emitOpError() << "address space mismatch";
+
+  return mlir::success();
+}
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steffenlarsen wrote:

I'm not sure I'm convinced this function adds much simplicity to this. Plenty of other places makes a similar check.

https://github.com/llvm/llvm-project/pull/230841