From ksmirnov@ox.ac.uk Sun Apr 02 08:48:48 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!ox!ksmirnov
From: ksmirnov@ox.ac.uk (Karen Smirnov)
Newsgroups: comp.sys.m68k
Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Apr02.084848.2906@ox.ac.uk>
Date: Sun, 02 Apr 1995 08:48:48 GMT
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Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

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

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

-- 
Karen Smirnov
Opinions expressed are solely my own and not those of Oxford University Computing Laboratory.
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From nbrennan@clari.net Tue Apr 04 03:44:48 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!clari!nbrennan
From: nbrennan@clari.net (Nadia Brennan)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Apr04.034448.2115@clari.net>
Date: Tue, 04 Apr 1995 03:44:48 GMT
References: <1995Apr02.084848.2906@ox.ac.uk>
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In article <1995Apr02.084848.2906@ox.ac.uk>, ksmirnov@ox.ac.uk (Karen Smirnov) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).
> A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.

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

-- 
=== Nadia Brennan ===
Dept of Electrical Engineering, ClariNet Communications Corp
"There are 14 nodes and only 10 countries. Count again."