================
@@ -434,6 +434,15 @@ struct AAAMDAttributesFunction : public AAAMDAttributes {
       indicatePessimisticFixpoint();
       return;
     }
+
+    for (Instruction &I : instructions(F)) {
+      if (isa<AddrSpaceCastInst>(I) &&
----------------
arsenm wrote:

5->3 is an illegal address space cast, but the round trip cast can fold away. 
You don't want the cast back to the original address space. 

https://github.com/llvm/llvm-project/pull/94647
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