From acampbell@hanse.de Mon Mar 06 00:29:27 1995
Path: ashpoly!cascade!mxgate!coyoacan!hanse!acampbell
From: acampbell@hanse.de (Amy Campbell)
Newsgroups: comp.sys.m68k
Subject: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Mar06.002927.8459@hanse.de>
Date: Mon, 06 Mar 1995 00:29:27 GMT
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Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

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.

Anyone running this on a Quadra 840AV with the 68040?

-- 
Amy Campbell
Tape trading list upon request. SASE required for international mail.

From dtanaka@netcom.com Tue Mar 07 06:41:27 1995
Path: ashpoly!cascade!brgate!saturno!netcom!dtanaka
From: dtanaka@netcom.com (Dong-hyun Tanaka)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Mar07.064127.9188@netcom.com>
Date: Tue, 07 Mar 1995 06:41:27 GMT
References: <1995Mar06.002927.8459@hanse.de>
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In article <1995Mar06.002927.8459@hanse.de>, acampbell@hanse.de (Amy Campbell) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

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

-- 
Dong-hyun Tanaka
Opinions expressed are solely my own and not those of NETCOM On-Line Communication Services.
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