[PATCH] D149573: [Clang][C++23] Implement core language changes from P1467R9 extended floating-point types and standard names and introduce Bfloat16 arithmetic type.

Tue May 9 13:52:09 PDT 2023

codemzs marked 2 inline comments as done.
codemzs added inline comments.

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Comment at: clang/include/clang/Basic/LangOptions.def:468

+LANGOPT(ExperimentalNewItaniumMangling, 1, 0, "experimental new Itanium mangling")
+
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erichkeane wrote:
> codemzs wrote:
> > erichkeane wrote:
> > > I'm not sure I like the implications or maintainability of this.  This is something that is likely to get out of hand too quickly.  We probably need to just figure out what the itanium mangling is GOING to be (perhaps @rjmccall has some  insight?), and just implement that.
> > > 
> > > Also, this isn't really a 'Language Option', so much as a codegen option.
> > Thank you for your valuable feedback. Based on your suggestion and considering that GCC has already implemented the mangling as `DF16b`, I agree that if we have reasonable confidence in the direction the mangling will take, it would be better to implement it directly instead of guarding it with an experimental flag. Therefore, I will be removing the flag. I initially added the flag since @tahonermann was on board with implementing the bf16 arithmetic type, assuming the mangling was finalized.
> > 
> > However, I understand your concerns and would appreciate further input from both @tahonermann and @rjmccall on this matter. My intention is to avoid stalling the progress of this change due to mangling finalization.
> > 
> > I'm open to further discussion and collaboration to ensure we make the right decision for our project while maintaining the momentum of the review process.
> Thanks, I think this is a good direction for this patch to take.
@erichkeane @tahonermann Itanium mangling is now finalized as `DF16b`and [[ https://github.com/itanium-cxx-abi/cxx-abi/pull/147#issuecomment-1540692344 | merged  ]]into the github repository. 

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  https://reviews.llvm.org/D149573/new/

https://reviews.llvm.org/D149573