[LAD] vectorization

Jussi Laako jussi at sonarnerd.net
Fri Apr 18 21:30:43 UTC 2008

Christian Schoenebeck wrote:
> I compared a pure C++ implementation vs. the hand crafted SSE assembly code 
> (by Sampo Savolainen, Ardour) and of course an implementation utilizing GCC's 
> vector extensions. On my very weak, but environment friendly ;-) VIA box the 

For simple operations, compilers are rather good on vectorization. Even 
though I don't know if there's any support for multi-arch targets on 
gcc, so that the SSE2/SSE3 optimized binary would run on hardware 
without SSE (dynamic code selection)? I haven't got time to follow the 
latest gcc developments.

For more complex operations like FIR, IIR, normalized cross-correlation 
or complex multiply-accumulate, I haven't seen any compiler being able 
to match hand-crafted assembly code.


	- Jussi Laako

More information about the Linux-audio-dev mailing list