From jramirez@u-tokyo.ac.jp Wed Oct 11 00:15:58 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!jramirez
From: jramirez@u-tokyo.ac.jp (Jens Ramírez)
Newsgroups: comp.sys.m68k
Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Oct11.001558.6190@u-tokyo.ac.jp>
Date: Wed, 11 Oct 1995 00:15:58 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.
Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector.

-- 
=== Jens Ramírez ===
Dept of Electrical Engineering, University of Tokyo Department of Information Science
"Hardware is temporary. The signal survives."

From jvasiliev@titech.ac.jp Thu Oct 12 07:52:58 1995
Path: ashpoly!cascade!transat!ukc!fennimore!titech!jvasiliev
From: jvasiliev@titech.ac.jp (Jens Vasiliev)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Oct12.075258.8843@titech.ac.jp>
Date: Thu, 12 Oct 1995 07:52:58 GMT
References: <1995Oct11.001558.6190@u-tokyo.ac.jp>
Organization: Tokyo Institute of Technology Computer Centre
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In article <1995Oct11.001558.6190@u-tokyo.ac.jp>, jramirez@u-tokyo.ac.jp (Jens Ramírez) 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.

-- 
Jens Vasiliev
Opinions expressed are solely my own and not those of Tokyo Institute of Technology Computer Centre.
------------------------------------------------------------

From gsmirnov@pipeline.com Fri Oct 13 18:21:58 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!pipeline!gsmirnov
From: gsmirnov@pipeline.com (Graham Smirnov)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Oct13.182158.2703@pipeline.com>
Date: Fri, 13 Oct 1995 18:21:58 GMT
References: <1995Oct11.001558.6190@u-tokyo.ac.jp>
Organization: The Pipeline Internet Network
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In article <1995Oct11.001558.6190@u-tokyo.ac.jp>, jramirez@u-tokyo.ac.jp (Jens Ramírez) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

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

-- 
=== Graham Smirnov ===
Dept of Electrical Engineering, The Pipeline Internet Network
"Hold for relay."