================
@@ -94,6 +94,11 @@ bool Qualifiers::isTargetAddressSpaceSupersetOf(LangAS A, 
LangAS B,
          (A == LangAS::Default &&
           (B == LangAS::cuda_constant || B == LangAS::cuda_device ||
            B == LangAS::cuda_shared)) ||
+         // In HLSL, the this pointer for member functions is in the default
+         // address space. This causes problem if the structure is in
+         // hlsl_device. We want to allow casting from hlsl_device to default
+         // until a proper solution for that issue is found.
+         (A == LangAS::Default && B == LangAS::hlsl_device) ||
----------------
s-perron wrote:

I'll write a proposal in wg-hlsl for how to handle the address space for the 
implicit `this`. That will separate it from this PR and 
https://github.com/llvm/wg-hlsl/pull/111. 

https://github.com/llvm/llvm-project/pull/127675
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