[MPlayer-dev-eng] Do we need to check for CPU types with --enable-runtime-cpudetection?

[Zuxy Meng]

2006/12/3, Zuxy Meng <zuxy.meng at gmail.com>:
> Hi,
>
> 2006/12/3, Ivan Kalvachev <ikalvachev at gmail.com>:
> > I'm against removal of this from bswap.h. It have nothing to do with
> > runtime cpu detection.
> >
> > 386 cpu is the minimal cpu that support usable protected mode.
> > It may be true that its speed is not usable for anything, but it would be the
> > lowest cpu to be implemented by emulation engine.
> >
> > Indeed the most popular emulators like qemu or valgrind does support
> > newer CPU's but still...
>
> Do you mean that if mplayer is to be run by such emulators, it has to
> be compiled with march=i386? There's no runtime support to detect
> whether bswap is available.
>
>
> > No objection.
>
> One more question: for ppc if a user provide both
> --enable-runtime-cpudetect and --disable-altivec, runtime cpu
> detection is disabled. But for x86, a user can at the same time enable
> runtime cpu detection and disable e.g. mmx, sse, etc., which will lead
> to link error (some routines required for runtime dispatch are not
> built). How do we handle this? Should we check this in configure?

And what if the user has provided --target=...?

-- 
Zuxy
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While truth is beauty.
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