> I have an optimized SSE-based resampling library that I bolted in PulseAudio. 
> It was
> measured to bring a 2x speed-up over speex, mainly because it uses 
> fixed-tables
> instead of interpolations, the price being that it can only be used for 
> fixed-rate
> sinks/sources.
> Since it's hardware-specific, I'd need a means to enable/disable it at 
> compile time,
> using some kind of voodoo magic in configure.ac. Does anyone have pointers on 
> SSE
> detection logic? To make things safe, I also detect SSE at run time but would 
> like to
> disable it completely for other non-x86 or older platforms.

CPUID processor instruction should provide all the details about the processor.

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