Re: expected baseline changes for forky => proposal no more FPU and 80bits float/double on i386

Le jeudi 13 août 2026, 12:53:55 heure d’été d’Europe centrale Bastien Roucaries a écrit :
> Hi,
> 
> In order to ease the user/devel experience I want for isa-support to create test for forky baseline
> 
> For now I test for armhf:
> 
> armv8-support
>     CPU feature checking - require ARMv8
> 
> neon-support
> 
> For armhf/arm64 (will like to know if it exist supported cpu without crc)
> 
> armv8crc-support
>     CPU feature checking - require ARMv8CRC
> 
> For amd64/i386 (i will like to only use psABI defintion so 
> 
> sse3-support
>     vérification de caractéristique de CPU – besoin de SSE3
> sse4.1-support
>     CPU feature checking - require SSE4.1
> sse4.2-support
>     SSE4.2
> x86-64-v2-support
>     CPU feature checking - require x86-64-v2
> x86-64-v3-support
>     CPU feature checking - require x86-64-v3

Now that we have as baseline SSE2 could be possible to have  #1127352 closed and use SSE for float and double.

It will likely close a lot of problem on the i386 platform but may be done quicly.

Note that due to System V ABI that requires floating‑point return values to be in ST(0), even if the function uses SSE internally, i387 will be still used and code is likely not optimal
but a least it will be less bug on debci.

rouca

> for ppc/ppc64
> 
> altivec-support
> 
> 
> Please ask feature to test before forky
> 
> rouca
> 
>

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