From mmoreno@panix.com Fri Jun 09 16:21:22 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!panix!mmoreno
From: mmoreno@panix.com (Mikhail Moreno)
Newsgroups: comp.sys.m68k
Subject: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Jun09.162122.8830@panix.com>
Date: Fri, 09 Jun 1995 16:21:22 GMT
Organization: Public Access Unix of New York
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Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.
Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

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

-- 
Mikhail Moreno | mmoreno@panix.com
PGP Key fingerprint: C0AD F209 3C82 CD64
"Keep the channels open."

From klarsson@panix.com Sat Jun 10 22:00:22 1995
Path: ashpoly!bigsur!pacrim!jpgate!kamome!panix!klarsson
From: klarsson@panix.com (Kenji Larsson)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Jun10.220022.3585@panix.com>
Date: Sat, 10 Jun 1995 22:00:22 GMT
References: <1995Jun09.162122.8830@panix.com>
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In article <1995Jun09.162122.8830@panix.com>, mmoreno@panix.com (Mikhail Moreno) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field.

Top-posters will be placed in my ~/.killfile without notice.

-- 
Kenji Larsson -- Public Access Unix of New York
"They will send a copy in my place."

From mrobertson@u-tokyo.ac.jp Sun Jun 11 13:13:22 1995
Path: ashpoly!bigsur!pacrim!krgate!eunha!u-tokyo!mrobertson
From: mrobertson@u-tokyo.ac.jp (Min-jun Robertson)
Newsgroups: comp.sys.m68k
Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Jun11.131322.7272@u-tokyo.ac.jp>
Date: Sun, 11 Jun 1995 13:13:22 GMT
References: <1995Jun09.162122.8830@panix.com>
Organization: University of Tokyo Department of Information Science
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In article <1995Jun09.162122.8830@panix.com>, mmoreno@panix.com (Mikhail Moreno) 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.

If you are posting from AOL, please read RFC 1036 before posting again.

-- 
Min-jun Robertson | mrobertson@u-tokyo.ac.jp
PGP Key fingerprint: 34FA 9C69 93A7 BB16
"Keep the channels open."