From ntanaka@demon.co.uk Sat Aug 12 06:14:09 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!demon!ntanaka
From: ntanaka@demon.co.uk (Natalia Tanaka)
Newsgroups: comp.sys.m68k
Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Aug12.061409.1992@demon.co.uk>
Date: Sat, 12 Aug 1995 06:14:09 GMT
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Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

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.

-- 
=== Natalia Tanaka ===
Dept of Electrical Engineering, Demon Internet Services UK
"5 sigma is a discovery. 7 is a question."

From gfournier@uu.net Sat Aug 12 08:55:09 1995
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From: gfournier@uu.net (Göran Fournier)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
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Date: Sat, 12 Aug 1995 08:55:09 GMT
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In article <1995Aug12.061409.1992@demon.co.uk>, ntanaka@demon.co.uk (Natalia Tanaka) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

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

-- 
Göran Fournier
Tape trading list upon request. SASE required for international mail.