From livanov@rwth-aachen.de Sat Jun 25 07:44:48 1994
Path: ashpoly!cascade!mxgate!coyoacan!rwth-aachen!livanov
From: livanov@rwth-aachen.de (Lars Ivanov)
Newsgroups: comp.sys.m68k
Subject: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Jun25.074448.9917@rwth-aachen.de>
Date: Sat, 25 Jun 1994 07:44:48 GMT
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Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.
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.

-- 
Lars Ivanov <livanov@rwth-aachen.de>
"The carrier frequency does not drift by accident."
Amiga 3000T / AmigaOS 3.1

From kkarlsson@illinois.edu Sun Jun 26 06:31:48 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!illinois!kkarlsson
From: kkarlsson@illinois.edu (Karen Karlsson)
Newsgroups: comp.sys.m68k
Subject: Re: WTB/WTT: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Jun26.063148.9484@illinois.edu>
Date: Sun, 26 Jun 1994 06:31:48 GMT
References: <1994Jun25.074448.9917@rwth-aachen.de>
Organization: University of Illinois Urbana-Champaign
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In article <1994Jun25.074448.9917@rwth-aachen.de>, livanov@rwth-aachen.de (Lars Ivanov) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.
> Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

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

If you are posting from AOL, please read RFC 1036 before posting again.

-- 
=== Karen Karlsson ===
Dept of Electrical Engineering, University of Illinois Urbana-Champaign
"Tape doesn't lie at 02:14. Ears do."