arichardson added inline comments.

================
Comment at: clang/lib/CodeGen/CGCall.cpp:2169
+    if (!CodeGenOpts.NullPointerIsValid &&
+        getContext().getTargetAddressSpace(FI.arg_begin()->type) == 0) {
+      Attrs.addAttribute(llvm::Attribute::NonNull);
----------------
Isn't the `this` pointer also nonnull in other address spaces?

In our CHERI fork we use AS200 for the this pointer and would quite like to 
have the nonnull attribute.
I can obviously change this line locally when I next merge from upstream, but I 
would like to avoid diffs and it seems to me like this restriction is 
unnecessary.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D17993/new/

https://reviews.llvm.org/D17993

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