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<H1>[Mageia-dev] Clanlib2 and SSE2 on i586</H1>
<B>Pascal Terjan</B>
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TITLE="[Mageia-dev] Clanlib2 and SSE2 on i586">pterjan at gmail.com
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<I>Tue Dec 4 20:57:15 CET 2012</I>
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<PRE>On Tue, Dec 4, 2012 at 6:08 PM, Pascal Terjan <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">pterjan at gmail.com</A>> wrote:
><i> On Tue, Dec 4, 2012 at 6:00 PM, Jose Jorge <<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">lists.jjorge at free.fr</A>> wrote:
</I>>><i> Le 04/12/2012 13:21, Pascal Terjan a écrit :
</I>>>><i>
</I>>>><i> On Tue, Dec 4, 2012 at 12:10 PM, AL13N<<A HREF="https://www.mageia.org/mailman/listinfo/mageia-dev">alien at rmail.be</A>> wrote:
</I>>>>>><i>
</I>>>>>><i> The code should really be complied but only enabled at runtime if it's
</I>>>>>><i>
</I>>>>>><i> available. PulseAudio does this. It's more of a pain to code for but
</I>>>>>><i> does make like easier for distributions.
</I>>>>>><i>
</I>>>>>><i> But yeah, short term fix, nuke the test, and as a meme says, keep calm
</I>>>>>><i> and carry on.
</I>>><i>
</I>>><i>
</I>>><i> It is not only a test, it is a crash.
</I>><i>
</I>><i> It is a crash because the code says to crash if there is no sse2.
</I>><i>
</I>>>>><i>
</I>>>>><i> but, do ALL recent i586 CPU's have SSE2? what about the embedded and VIA
</I>>>>><i> cpu's and the likes?
</I>>><i>
</I>>><i>
</I>>><i> <A HREF="http://en.wikipedia.org/wiki/SSE2#CPUs_supporting_SSE2">http://en.wikipedia.org/wiki/SSE2#CPUs_supporting_SSE2</A>
</I>>><i>
</I>>><i>
</I>>>><i>
</I>>>><i> The test is that it refuses to run if the lib is not using sse2 while
</I>>>><i> it could (slowly).
</I>>>><i>
</I>>>><i> The clanSWRender lib needs to be fixed to have sse2 support on sse2
</I>>>><i> system and not on non sse2 systems so that we can enable it but that's
</I>>>><i> something unrelated to dropping this test.
</I>>><i>
</I>>><i>
</I>>><i> No, the clanSWRender has only a SSE2 implementation because no one wants to
</I>>><i> write a SW render which is too slow.
</I>>><i> <A HREF="http://lists.debian.org/debian-devel-games/2012/03/msg00076.html">http://lists.debian.org/debian-devel-games/2012/03/msg00076.html</A>
</I>><i>
</I>><i> The message complains that your CPU has SSE2 but it can not use it as
</I>><i> clanSWRender was built without support from it.
</I>><i> How can it be built without support for SSE2 if it is not optional ?
</I>><i>
</I>>><i> I wonder if we could enable for now SSE2, till upstream/somebody has a
</I>>><i> better fix : for now, all SSE2 cpus crash. Enabling SSE2 it will only crash
</I>>><i> on non-SSE2 cpus (older than 10 years)
</I>><i>
</I>><i> The crash is in the app, are there other apps using clanSWRender which
</I>><i> are working fine without SSE2 but would crash if clanSWRender had SSE2
</I>><i> support?
</I>
So, reading more about it, clanSWRender is a software renderer instead
of using one of the opengl ones
Why would an application need it? Is it faster than using for example
mesa's software rendering?
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