From amoreno@panix.com Wed Sep 20 00:21:10 1995
Path: ashpoly!cascade!bigsur!panix!amoreno
From: amoreno@panix.com (Anja Moreno)
Newsgroups: comp.sys.m68k
Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Sep20.002110.7787@panix.com>
Date: Wed, 20 Sep 1995 00:21:10 GMT
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Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

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?

-- 
Anja Moreno
Tape trading list upon request. SASE required for international mail.

From vkarlsson@earthlink.net Thu Sep 21 13:22:10 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!earthlink!vkarlsson
From: vkarlsson@earthlink.net (Valeria Karlsson)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Sep21.132210.8010@earthlink.net>
Date: Thu, 21 Sep 1995 13:22:10 GMT
References: <1995Sep20.002110.7787@panix.com>
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In article <1995Sep20.002110.7787@panix.com>, amoreno@panix.com (Anja Moreno) writes:
> Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead.

-- 
Valeria Karlsson -- EarthLink Network
"5 sigma is a discovery. 7 is a question."