From skang@cam.ac.uk Sun Jul 23 23:20:29 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!skang
From: skang@cam.ac.uk (Seo-yeon Kang)
Newsgroups: comp.sys.m68k
Subject: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Jul23.232029.5361@cam.ac.uk>
Date: Sun, 23 Jul 1995 23:20:29 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.

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

-- 
=== Seo-yeon Kang ===
Dept of Electrical Engineering, University of Cambridge Computer Laboratory
"In theory there is no difference between theory and practice."

From sgirard@uni-hamburg.de Mon Jul 24 23:06:29 1995
Path: ashpoly!cascade!mxgate!coyoacan!uni-hamburg!sgirard
From: sgirard@uni-hamburg.de (Seo-yeon Girard)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Jul24.230629.9755@uni-hamburg.de>
Date: Mon, 24 Jul 1995 23:06:29 GMT
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In article <1995Jul23.232029.5361@cam.ac.uk>, skang@cam.ac.uk (Seo-yeon Kang) writes:
> 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.

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

My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

-- 
Seo-yeon Girard | sgirard@uni-hamburg.de
PGP Key fingerprint: 55E0 1153 CB43 7018
"Keep the channels open."