From bcampbell@cmu.edu Sun Oct 08 17:47:54 1995
Path: ashpoly!cascade!transat!sunet!nordrelay!cmu!bcampbell
From: bcampbell@cmu.edu (Bruno Campbell)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Oct08.174754.6994@cmu.edu>
Date: Sun, 08 Oct 1995 17:47:54 GMT
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Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.
Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow.

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

-- 
Bruno Campbell
Tape trading list upon request. SASE required for international mail.

From aduarte@uni-hamburg.de Mon Oct 09 18:00:54 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!uni-hamburg!aduarte
From: aduarte@uni-hamburg.de (Astrid Duarte)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Oct09.180054.9516@uni-hamburg.de>
Date: Mon, 09 Oct 1995 18:00:54 GMT
References: <1995Oct08.174754.6994@cmu.edu>
Organization: Universität Hamburg Fachbereich Informatik
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In article <1995Oct08.174754.6994@cmu.edu>, bcampbell@cmu.edu (Bruno Campbell) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.
> Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

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

-- 
Astrid Duarte -- Universität Hamburg Fachbereich Informatik
"They will send a copy in my place."

From nramirez@uni-hamburg.de Tue Oct 10 18:00:54 1995
Path: ashpoly!cascade!mxgate!coyoacan!uni-hamburg!nramirez
From: nramirez@uni-hamburg.de (Nadia Ramírez)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Oct10.180054.9761@uni-hamburg.de>
Date: Tue, 10 Oct 1995 18:00:54 GMT
References: <1995Oct08.174754.6994@cmu.edu>
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In article <1995Oct08.174754.6994@cmu.edu>, bcampbell@cmu.edu (Bruno Campbell) 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.

-- 
=== Nadia Ramírez ===
Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik
"There are 14 nodes and only 10 countries. Count again."

From kkang@u-tokyo.ac.jp Wed Oct 11 23:26:54 1995
Path: ashpoly!cascade!bigsur!u-tokyo!kkang
From: kkang@u-tokyo.ac.jp (Katrin Kang)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Oct11.232654.2927@u-tokyo.ac.jp>
Date: Wed, 11 Oct 1995 23:26:54 GMT
References: <1995Oct08.174754.6994@cmu.edu> <1995Oct09.180054.9516@uni-hamburg.de>
Organization: University of Tokyo Department of Information Science
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In article <1995Oct09.180054.9516@uni-hamburg.de>, aduarte@uni-hamburg.de (Astrid Duarte) writes:
> The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds.

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

-- 
Katrin Kang
Tape trading list upon request. SASE required for international mail.