From flarsson@panix.com Thu Apr 27 11:57:48 1995
Path: ashpoly!cascade!mxgate!coyoacan!panix!flarsson
From: flarsson@panix.com (Freya Larsson)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Apr27.115748.6391@panix.com>
Date: Thu, 27 Apr 1995 11:57:48 GMT
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Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.
Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

Anyone running this on a Quadra 840AV with the 68040?

-- 
Freya Larsson <flarsson@panix.com>
*PLONK* filter active for trolls.
PC-9821Ap2 (NEC) - NetBSD 1.0

From mperez@tum.de Fri Apr 28 22:29:48 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!tum!mperez
From: mperez@tum.de (Marta Pérez)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Apr28.222948.3721@tum.de>
Date: Fri, 28 Apr 1995 22:29:48 GMT
References: <1995Apr27.115748.6391@panix.com>
Organization: Technische Universität München
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In article <1995Apr27.115748.6391@panix.com>, flarsson@panix.com (Freya Larsson) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.
> A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.

The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds.

-- 
Marta Pérez -- Technische Universität München
"The hatch is open. Is anyone listening?"