I've played a little bit FFTW and I've remarked that its performance can
vary a lot depending on how good your compiler is at optimization.
For instance, compiled FFTW code is far from optimal with MSVC++ 6. This
compiler doesn't fully use the FPU stack like an ASM programmer could do and
I don't know why since I'm sure that writing a compiler that would make a
good usage of the FPU registers is far from impossible.
So, the compiler you use to compile FFTW is a major factor for the
performance you'll get from it.
I don't know if someone have done similar experiences and if there is a
better compiler than MSVC for intensive FP code.
Olivier Langlois - [EMAIL PROTECTED] -
http://www3.sympatico.ca/olanglois
Nortel 515-818-1010 x46659
Montreal, Canada
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