🚀 go-pugleaf

Voici l'extrait d'un article donnant ces informations:

For a 1024 point, complex, single precision FFT (i.e. just fits in the on-chip
8K D cache), we have a measured time of 96,000 cycles.  For the various Alpha
systems, this translates to:

	133 MHz clock		722 microseconds
	150 Mhz			640 microseconds
	200 MHz			480 microseconds

The algorithm is a radix-4 algorithm, and is basically just a C translation
of the FORTRAN code in "DFT/FFT and Convolution Algorithms" by Burrus and 
Parks (with a few tweaks, of course).  It was compiled with GCC 2.3 and
the execution time was measured with the Alpha's process cycle counter.

The Digital Extended Math Library (DXML) for Alpha reportedly can do even 
better, but I don't have any current performance numbers.  For more info on
DXML, contact your local Digital sales rep. [Nous devons le recevoir dans
la pre-release prochaine].

For some more information on signal processing on Alpha, see our technical
report "Are DSP Chips Obsolete?" [disponible chez nous].