From jmoreau@cam.ac.uk Thu Sep 05 13:13:07 1996
Path: ashpoly!cascade!transat!sunet!nordrelay!cam!jmoreau
From: jmoreau@cam.ac.uk (Jens Moreau)
Newsgroups: comp.sys.m68k
Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Sep05.131307.6623@cam.ac.uk>
Date: Thu, 05 Sep 1996 13:13:07 GMT
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Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

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.

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

-- 
Jens Moreau -- University of Cambridge Computer Laboratory
"A soul is not exclusive to biology."

From khernandez@uu.net Thu Sep 05 18:18:07 1996
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From: khernandez@uu.net (Karen Hernández)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Sep05.181807.4989@uu.net>
Date: Thu, 05 Sep 1996 18:18:07 GMT
References: <1996Sep05.131307.6623@cam.ac.uk>
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In article <1996Sep05.131307.6623@cam.ac.uk>, jmoreau@cam.ac.uk (Jens Moreau) writes:
> Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?
> By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes.

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

-- 
Karen Hernández
Opinions expressed are solely my own and not those of UUNET Technologies, Falls Church VA.
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