[PD-dev] using SIMD instructions in externals

[Ed Kelly]

Thanks, these are my own perrsonal "bootstraps" for me
to start learning what SSE is all about!

Most,
Ed

--- IOhannes m zmoelnig <zmoelnig at iem.at> wrote:

> Ed Kelly wrote:
> > the perform routine, or am I missing something
> here? I
> > apologise for my lack of knowledge...
> 
> well, you have to write simd yourself!
> i think this was unclear from previous posts.
> 
> in pd_devel several often used functions (like
> adding 2 dsp-vectors) are 
> implemented in SIMD.
> if you don't want to do that (add 2 dsp-vectors)
> then you will have to 
> write SIMD-code yourself (ah yes, i am repeating
> repeating).
> 
> however, you might get a glimpse of how it is done.
> 
> for obvious reasons i (once again) would suggest to
> rather have a look 
> at zexy how you would write SSE-code in an external.
> (e.g. look at the implementation of abs~ in the
> CVS-zexy)
> 
> while the tastes differ, i have found it most
> convenient to write 
> SIMD-code not in assembler but rather in intrinsics
> (C-like 
> function-wrappers around assembler): apart from
> taste this has also the 
> benefit of being portable across different compilers
> (e.g. you can use 
> the same implementation for both gcc and icc and
> m$vc).
> 
> note however, that you have it doesn't create code
> that is portable 
> across different architectures (you need different
> implementations for 
> SSE and AltiVec, even though you compile both with
> gcc)
> 
> if you want to write code that is both portable
> across compilers and 
> architectures, you should use C ;-)
> 
> 
> mfa.sdr
> IOhannes
> 


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