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  • x86 FP issues (Re: [gentoo-dev] Arch Status and Future Plans)

    From Sam James@21:1/5 to Arthur Zamarin on Wed Jun 26 02:30:01 2024
    Arthur Zamarin <arthurzam@gentoo.org> writes:

    Hi all, this will be a long mail, and might be confusing, I'll try to organize it, but this is a mess, so bear with me.
    [...]
    ======== 32-bit arches ========

    This includes stable arches x86, arm, ppc, sparc32, dev arches s390, and maybe more. Those are in much worse situation, with a mess on various
    fronts, some of them super hard to continue support. For example
    qtwebengine is less and less likely to manage to compile on a
    real-hardware, and not 32-bit chroot on 64-bit host. Arch Team want to minimize our work on those arches, meaning mass-destable and even mass-dekeyword, with potentially full drop of stable status.

    ======== x86 ========

    Stable 32-bit arch. I'll be honest, I don't believe at all this should
    be stable arch anymore. I propose making it dev arch, and mass-dekeyword stuff we got because of inertia. This arch is close to HW die. (let's
    not talk about i486 vs i686).

    I think the mfpmath=sse thing [0] makes this a bit better but I still sympathise with your point.

    [0] https://public-inbox.gentoo.org/gentoo-dev/ce894afe6c2b324fef012da9bb9387cfde7aed03.camel@gentoo.org/

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  • From =?UTF-8?Q?Micha=C5=82_G=C3=B3rny?=@21:1/5 to Sam James on Fri Jun 28 07:30:01 2024
    On Wed, 2024-06-26 at 01:20 +0100, Sam James wrote:
    Arthur Zamarin <arthurzam@gentoo.org> writes:

    Hi all, this will be a long mail, and might be confusing, I'll try to organize it, but this is a mess, so bear with me.
    [...]
    ======== 32-bit arches ========

    This includes stable arches x86, arm, ppc, sparc32, dev arches s390, and maybe more. Those are in much worse situation, with a mess on various fronts, some of them super hard to continue support. For example qtwebengine is less and less likely to manage to compile on a real-hardware, and not 32-bit chroot on 64-bit host. Arch Team want to minimize our work on those arches, meaning mass-destable and even mass-dekeyword, with potentially full drop of stable status.

    ======== x86 ========

    Stable 32-bit arch. I'll be honest, I don't believe at all this should
    be stable arch anymore. I propose making it dev arch, and mass-dekeyword stuff we got because of inertia. This arch is close to HW die. (let's
    not talk about i486 vs i686).

    I think the mfpmath=sse thing [0] makes this a bit better but I still sympathise with your point.

    I'd just like to point out that `-mfpmath=sse` is a two-edged sword. It generally makes results more consistent with other architectures which
    is good and resolves some test failures when people *aren't testing with
    x86*. However, it breaks stuff when people are specifically testing
    with x86 and accounting for i387 math (sigh).


    [0] https://public-inbox.gentoo.org/gentoo-dev/ce894afe6c2b324fef012da9bb9387cfde7aed03.camel@gentoo.org/

    --
    Best regards,
    Michał Górny


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