On Tue, 4 Oct 2022, Jakub Jelinek via Gcc-patches wrote: > Yet another problem is because I've only enabled the bf16/BF16 suffixes in > C++ because for C it might clash with some later extension. Am I right to > fear about that, or do you think C will never standardize suffixes that > would clash with that because C++ standardized the bf16/BF16 suffixes for > something already? If I could enable it, I'd always pedwarn for C for those
I think any C proposal to standardize something conflicting with C++ would get objections from the WG21 liaison. > Another question is the suffixes of the builtins. For now I have added > bf16 suffix and enabled the builtins with !both_p, so one always needs to > use __builtin_* form for them. None of the GCC builtins end with b, > so this isn't ambiguous with __builtin_*f16, but some libm functions do end > with b, in particular ilogb, logb and f{??,??x}sub. ilogb and the subs > always have it, but is __builtin_logbf16 f16 suffixed logb or bf16 suffixed > log? Shall the builtins use f16b suffixes instead like the mangling does? Indeed, that conflict means bf16 isn't suitable for the built-in function suffix. -- Joseph S. Myers jos...@codesourcery.com