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Draft: util: add half-float optimization to RISC-V

David Heidelberg requested to merge dh/mesa:241104-riscv-fast_half_float into main

What does this MR do and why?

RVA22 standard compatible hardware is shipped this year and extension for handling single ↔ half is part of it.

Sadly, we cannot reliably auto-detect, but there is change that distributions will start switching to RVA22, or 23 soon.

Implemented auto-detection, so even without system compiled with RVA22+ profile can benefit.

util: add half-float optimization to RISC-V

Zfhmin is an extension, but mandatory in RVA22 and RVA23 profiles.

Signed-off-by: David Heidelberg <david@ixit.cz>
Edited by David Heidelberg

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