From msuzuki@cam.ac.uk Fri May 26 18:23:31 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!cam!msuzuki
From: msuzuki@cam.ac.uk (Mateo Suzuki)
Newsgroups: comp.sys.m68k
Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995May26.182331.2202@cam.ac.uk>
Date: Fri, 26 May 1995 18:23:31 GMT
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Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow.
A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.

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

-- 
Mateo Suzuki | msuzuki@cam.ac.uk
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"Keep the channels open."

From akuznetsov@pacbell.net Sun May 28 17:22:31 1995
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From: akuznetsov@pacbell.net (Astrid Kuznetsov)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995May28.172231.3497@pacbell.net>
Date: Sun, 28 May 1995 17:22:31 GMT
References: <1995May26.182331.2202@cam.ac.uk>
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In article <1995May26.182331.2202@cam.ac.uk>, msuzuki@cam.ac.uk (Mateo Suzuki) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

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

PGP Public key available via finger or upon request.

-- 
Astrid Kuznetsov -- Pacific Bell Internet Services
"Hardware is temporary. The signal survives."