From vschneider@uu.net Sun Dec 10 16:31:29 1995
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From: vschneider@uu.net (Valeria Schneider)
Newsgroups: comp.sys.m68k
Subject: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Dec10.163129.6270@uu.net>
Date: Sun, 10 Dec 1995 16:31:29 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.

-- 
Valeria Schneider -- UUNET Technologies, Falls Church VA
"Row 14. No joke."

From asanchez@utexas.edu Sun Dec 10 21:15:29 1995
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From: asanchez@utexas.edu (Aiko Sánchez)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Dec10.211529.7462@utexas.edu>
Date: Sun, 10 Dec 1995 21:15:29 GMT
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In article <1995Dec10.163129.6270@uu.net>, vschneider@uu.net (Valeria Schneider) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

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

-- 
=== Aiko Sánchez ===
Dept of Electrical Engineering, University of Texas at Austin
"Row 14. No joke."

From tschneider@rwth-aachen.de Tue Dec 12 18:30:29 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!rwth-aachen!tschneider
From: tschneider@rwth-aachen.de (Thiago Schneider)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Dec12.183029.8105@rwth-aachen.de>
Date: Tue, 12 Dec 1995 18:30:29 GMT
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In article <1995Dec10.163129.6270@uu.net>, vschneider@uu.net (Valeria Schneider) 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.

-- 
=== Thiago Schneider ===
Dept of Electrical Engineering, RWTH Aachen Informatik
"When every node is whole, the channel opens."

From ssato@ox.ac.uk Thu Dec 14 14:59:29 1995
Path: ashpoly!cascade!transat!eunet-fr!teletel!ox!ssato
From: ssato@ox.ac.uk (Sergei Sato)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Dec14.145929.6322@ox.ac.uk>
Date: Thu, 14 Dec 1995 14:59:29 GMT
References: <1995Dec10.163129.6270@uu.net> <1995Dec10.211529.7462@utexas.edu>
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In article <1995Dec10.211529.7462@utexas.edu>, asanchez@utexas.edu (Aiko Sánchez) 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.

-- 
Sergei Sato | ssato@ox.ac.uk
PGP Key fingerprint: 97A5 108A 5FA0 36C1
"Keep the channels open."