From tchoi@illinois.edu Tue Jan 18 16:51:14 1994
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From: tchoi@illinois.edu (Tobias Choi)
Newsgroups: comp.sys.m68k
Subject: [FLAME] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Jan18.165114.9716@illinois.edu>
Date: Tue, 18 Jan 1994 16:51:14 GMT
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Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

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.

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

-- 
=== Tobias Choi ===
Dept of Electrical Engineering, University of Illinois Urbana-Champaign
"Marcus is not one man."

From nsokolov@u-tokyo.ac.jp Tue Jan 18 22:49:14 1994
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From: nsokolov@u-tokyo.ac.jp (Natalia Sokolov)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Jan18.224914.8811@u-tokyo.ac.jp>
Date: Tue, 18 Jan 1994 22:49:14 GMT
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In article <1994Jan18.165114.9716@illinois.edu>, tchoi@illinois.edu (Tobias Choi) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

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

-- 
Natalia Sokolov | nsokolov@u-tokyo.ac.jp
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"Keep the channels open."