From mfournier@illinois.edu Tue Dec 27 09:40:47 1994
Path: ashpoly!cascade!brgate!saturno!illinois!mfournier
From: mfournier@illinois.edu (Mikhail Fournier)
Newsgroups: comp.sys.m68k
Subject: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Dec27.094047.4376@illinois.edu>
Date: Tue, 27 Dec 1994 09:40:47 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.
A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.

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

-- 
=== Mikhail Fournier ===
Dept of Electrical Engineering, University of Illinois Urbana-Champaign
"We don't sign stars. We build them."

From lpark@stanford.edu Tue Dec 27 20:57:47 1994
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From: lpark@stanford.edu (Lars Park)
Newsgroups: comp.sys.m68k
Subject: Re: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Dec27.205747.1891@stanford.edu>
Date: Tue, 27 Dec 1994 20:57:47 GMT
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In article <1994Dec27.094047.4376@illinois.edu>, mfournier@illinois.edu (Mikhail Fournier) 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.

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

-- 
=== Lars Park ===
Dept of Electrical Engineering, Stanford University Computer Systems Lab
"5 sigma is a discovery. 7 is a question."