From ksantos@pacbell.net Sun Aug 21 08:02:17 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!pacbell!ksantos
From: ksantos@pacbell.net (Katrin Santos)
Newsgroups: comp.sys.m68k
Subject: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Aug21.080217.3127@pacbell.net>
Date: Sun, 21 Aug 1994 08:02:17 GMT
Organization: Pacific Bell Internet Services
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Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.
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.

-- 
Katrin Santos
Opinions expressed are solely my own and not those of Pacific Bell Internet Services.
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From egirard@inria.fr Mon Aug 22 23:29:17 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!inria!egirard
From: egirard@inria.fr (Elaine Girard)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Aug22.232917.5836@inria.fr>
Date: Mon, 22 Aug 1994 23:29:17 GMT
References: <1994Aug21.080217.3127@pacbell.net>
Organization: INRIA Rocquencourt
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In article <1994Aug21.080217.3127@pacbell.net>, ksantos@pacbell.net (Katrin Santos) writes:
> Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

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

Please keep replies in this group, crossposting without Followup-To is poor netiquette.

-- 
Elaine Girard -- INRIA Rocquencourt
"Hardware is temporary. The signal survives."