[Mageia-dev] Clanlib2 and SSE2 on i586

Tue Dec 4 19:08:42 CET 2012

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