From bpark@cam.ac.uk Mon Sep 25 17:18:40 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!cam!bpark
From: bpark@cam.ac.uk (Bastien Park)
Newsgroups: comp.sys.m68k
Subject: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Sep25.171840.8358@cam.ac.uk>
Date: Mon, 25 Sep 1995 17:18:40 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.

Make sure you install the 32-bit Enabler on older IIci machines running System 7.1!

-- 
Bastien Park
Tape trading list upon request. SASE required for international mail.

From fjohansson@mindspring.com Mon Sep 25 22:04:40 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!mindspring!fjohansson
From: fjohansson@mindspring.com (Fiona Johansson)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Sep25.220440.9972@mindspring.com>
Date: Mon, 25 Sep 1995 22:04:40 GMT
References: <1995Sep25.171840.8358@cam.ac.uk>
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In article <1995Sep25.171840.8358@cam.ac.uk>, bpark@cam.ac.uk (Bastien Park) 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.

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

-- 
Fiona Johansson
Opinions expressed are solely my own and not those of MindSpring Enterprises.
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