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

[M. Zeeshan Siddiqui via Phabricator via cfe-commits]

codemzs added a comment.

In D149573#4309378 <https://reviews.llvm.org/D149573#4309378>, @tschuett wrote:

> I don't believe that there is NativeBFloat16Type. AArch64 learned bf16 with ARMv8.6-A, but very limited operations and only in SIMD. X86 supports bf16 since Cooperlake, but very limited operations and only in SIMD.
>
> Maybe GPUs?



In D149573#4309378 <https://reviews.llvm.org/D149573#4309378>, @tschuett wrote:

> I don't believe that there is NativeBFloat16Type. AArch64 learned bf16 with ARMv8.6-A, but very limited operations and only in SIMD. X86 supports bf16 since Cooperlake, but very limited operations and only in SIMD.
>
> Maybe GPUs?

Dear @tschuett,

Thank you for your input. It seems that NativeBFloat16Type is indeed limited in availability. As you mentioned, AArch64 and X86 offer some bf16 support, but only in SIMD and with limited operations. This flag is intended to guard changes for targets with full bf16 support, as discussed in this RFC: https://discourse.llvm.org/t/rfc-c-23-p1467r9-extended-floating-point-types-and-standard-names/70033/12. While few public targets currently have native bf16 support, this still serves as a useful precaution.


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