AltiVec is a set of instructions for the PowerPC processor which enhance the performance of signal and image processing using a SIMD (single-instruction multiple-data) approach. After searching for a good open-source AltiVec implementation of the Fast Fourier Transform (FFT), I have put together the AltiVec FFT page. It has all of the source, some benchmarks, and runs on Mac OS X or LinuxPPC. I even compared it to the venerable (but scalar) FFTW.
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Mac OS X Hints
http://hints.macworld.com/article.php?story=20030322170252463