[MPlayer-dev-eng] [PATCH]: af_resample SIMD optimization(MMX/SSE2/3DNOW!/SSE/SSE3)

[Andrew Savchenko]

Hi,

On Thursday 12 March 2009 10:09, Zhou Zongyi wrote:
> I tested them on Athlon XP. SSE3 seems a bit faster than SSE.
> Perhaps lddqu is faster than movups?

Huh? Athlon XP doesn't support neither SSE3, nor SSE2, only SSE.

# x86info
[...]
Family: 6 Model: 10 Stepping: 0
CPU Model : Athlon XP (Barton)
Feature flags:
 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat 
pse36 mmx fxsr sse
Extended feature flags:
 fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat 
pse36 mmxext mmx fxsr 3dnowext 3dnow

And the following code fails with SIGILL on my Athlon XP:
int main(void) {
    __asm__ __volatile__ ("addsubpd %%xmm0, %%xmm1":::"memory");
    return 0;
}

lddqu also fails with SIGILL.
Am I missing something?

Anyway it is always a good idea to have SSE code as fallback for 
the case when SSE3 is not available.

-- 
Best regards,
Andrew
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