From jreyes@rwth-aachen.de Tue Apr 04 14:05:44 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!rwth-aachen!jreyes
From: jreyes@rwth-aachen.de (Julien Reyes)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Apr04.140544.5587@rwth-aachen.de>
Date: Tue, 04 Apr 1995 14:05:44 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.
By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes.

I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector.

-- 
Julien Reyes | jreyes@rwth-aachen.de
PGP Key fingerprint: 714E 501B 1A0A DCD0
"Keep the channels open."

From asmirnov@cern.ch Thu Apr 06 10:32:44 1995
Path: ashpoly!cascade!transat!ukc!fennimore!cern!asmirnov
From: asmirnov@cern.ch (Andrei Smirnov)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Apr06.103244.2077@cern.ch>
Date: Thu, 06 Apr 1995 10:32:44 GMT
References: <1995Apr04.140544.5587@rwth-aachen.de>
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In article <1995Apr04.140544.5587@rwth-aachen.de>, jreyes@rwth-aachen.de (Julien Reyes) 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.

-- 
Andrei Smirnov | asmirnov@cern.ch
PGP Key fingerprint: 8067 9974 3775 BDE5
"Keep the channels open."