codemzs added a comment.

Hi @rjmccall and @erichkeane,

I would like to inquire about the necessity of implementing excess precision 
support for `std::bfloat16_t` in this patch. In reference to the discussion on 
https://reviews.llvm.org/D136919, it was mentioned that introducing 
`std::bfloat16_t` in Clang requires proper mangling, semantics, and excess 
precision support.

However, this change includes a front-end flag that enables `bfloat16` 
arithmetic only when the target natively supports `bfloat16` operations. Given 
this restriction, is it still essential to provide excess precision support for 
`std::bfloat16_t` in this patch?

Thank you for your guidance.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D149573/new/

https://reviews.llvm.org/D149573

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