From ereyes@delphi.com Thu May 26 00:10:22 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!delphi!ereyes
From: ereyes@delphi.com (Emi Reyes)
Newsgroups: comp.sys.m68k
Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994May26.001022.5726@delphi.com>
Date: Thu, 26 May 1994 00:10:22 GMT
Organization: Delphi Internet Services
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Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

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

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

-- 
Emi Reyes
Opinions expressed are solely my own and not those of Delphi Internet Services.
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From gmuller@uni-hamburg.de Fri May 27 07:22:22 1994
Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!gmuller
From: gmuller@uni-hamburg.de (Göran Müller)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994May27.072222.8090@uni-hamburg.de>
Date: Fri, 27 May 1994 07:22:22 GMT
References: <1994May26.001022.5726@delphi.com>
Organization: Universität Hamburg Fachbereich Informatik
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In article <1994May26.001022.5726@delphi.com>, ereyes@delphi.com (Emi Reyes) writes:
> Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?
> 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.

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

-- 
Göran Müller -- Universität Hamburg Fachbereich Informatik
"When every node is whole, the channel opens."