new C23 functions

[Vincent Lefevre]

On 2024-12-12 11:30:40 +0000, Joseph Myers wrote:
> Since some tests use MPFR to generate expected results and MPFR comes with 
> a "(DON'T USE MPFR_RNDNA!)" warning, there is also the issue of how to 
> generate expected results for this mode in general.

With MPFR, you can use the mpfr_round_nearest_away macro.

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Vincent Lefèvre <vincent@vinc17.net> - Web: <https://www.vinc17.net/>
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