From htanaka@pipeline.com Sat Jun 08 14:21:30 1996
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!pipeline!htanaka
From: htanaka@pipeline.com (Heather Tanaka)
Newsgroups: comp.sys.m68k
Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Jun08.142130.2969@pipeline.com>
Date: Sat, 08 Jun 1996 14:21:30 GMT
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Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes.
Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

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

-- 
=== Heather Tanaka ===
Dept of Electrical Engineering, The Pipeline Internet Network
"Hardware is temporary. The signal survives."

From brodriguez@clari.net Mon Jun 10 18:19:30 1996
Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!brodriguez
From: brodriguez@clari.net (Bill Rodríguez)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Jun10.181930.1250@clari.net>
Date: Mon, 10 Jun 1996 18:19:30 GMT
References: <1996Jun08.142130.2969@pipeline.com>
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In article <1996Jun08.142130.2969@pipeline.com>, htanaka@pipeline.com (Heather Tanaka) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

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

My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise!

-- 
Bill Rodríguez | brodriguez@clari.net
PGP Key fingerprint: ACF1 EDBE 13C8 D8EA
"Keep the channels open."

From dhernandez@mit.edu Tue Jun 11 15:43:30 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!mit!dhernandez
From: dhernandez@mit.edu (Dmitri Hernández)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Jun11.154330.8426@mit.edu>
Date: Tue, 11 Jun 1996 15:43:30 GMT
References: <1996Jun08.142130.2969@pipeline.com> <1996Jun10.181930.1250@clari.net>
Organization: Massachusetts Institute of Technology
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In article <1996Jun10.181930.1250@clari.net>, brodriguez@clari.net (Bill Rodríguez) writes:
> Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead.

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

-- 
=== Dmitri Hernández ===
Dept of Electrical Engineering, Massachusetts Institute of Technology
"The carrier frequency does not drift by accident."

From mjohansson@stanford.edu Thu Jun 13 00:51:30 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!mjohansson
From: mjohansson@stanford.edu (Mei Johansson)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Jun13.005130.6113@stanford.edu>
Date: Thu, 13 Jun 1996 00:51:30 GMT
References: <1996Jun08.142130.2969@pipeline.com>
Organization: Stanford University Computer Systems Lab
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In article <1996Jun08.142130.2969@pipeline.com>, htanaka@pipeline.com (Heather Tanaka) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

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

-- 
Mei Johansson
Tape trading list upon request. SASE required for international mail.