hliao added inline comments.

================
Comment at: llvm/lib/Target/AMDGPU/AMDGPUTargetMachine.cpp:533
+  if (!LD)
+    return -1;
+
----------------
tra wrote:
> Is there a suitable constant for `don't know` result?
I would say all generic pointers loaded from the constant memory are safe to be 
assumed as global ones (for AMDGPU). I explained the reason in the usage 
document. The constant memory could be modified by the host, where only global 
memory objects are visible.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D91121/new/

https://reviews.llvm.org/D91121

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