[MPlayer-dev-eng] cpuid vs 386 vs 486

[Arpi]

Hi,

hmm. where is __CPU__ defined? internal of gcc ?

> Hi
> 
> On Tuesday 05 February 2002 22:28, Arpi wrote:
> > Hi,
> >
> > it probably uses BSWAP. It's specific to 486+ cpus, and common in these
> > codecs.
> bswap.h:
> ---------------------------------
> inline static unsigned int ByteSwap32(unsigned int x)
> {
> #if __CPU__ > 386
>  __asm("bswap	%0":
>       "=r" (x)     :
> #else
>  __asm("xchgb	%b0,%h0\n"
>       "	rorl	$16,%0\n"
>       "	xchgb	%b0,%h0":
>       "=q" (x)		:
> #endif
>       "0" (x));
>   return x;
> }
> ----------------------------------
> so it wont work if its compiled on 486+ and executed on 386
> runtime cpudetect detect is imho not worth it here, and would have a serious 
> impact on performance as this is used in the bitstream reader which is called 
> alot
> 
> [...]
> Michael
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> 
> 


A'rpi / Astral & ESP-team

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