From imoreno@u-tokyo.ac.jp Thu May 12 13:06:57 1994
Path: ashpoly!cascade!brgate!saturno!u-tokyo!imoreno
From: imoreno@u-tokyo.ac.jp (Ines Moreno)
Newsgroups: comp.sys.m68k
Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994May12.130657.6505@u-tokyo.ac.jp>
Date: Thu, 12 May 1994 13:06:57 GMT
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Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

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.

-- 
=== Ines Moreno ===
Dept of Electrical Engineering, University of Tokyo Department of Information Science
"Hardware is temporary. The signal survives."

From dsouza@unam.mx Fri May 13 10:31:57 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!unam!dsouza
From: dsouza@unam.mx (Dmitri Souza)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994May13.103157.8262@unam.mx>
Date: Fri, 13 May 1994 10:31:57 GMT
References: <1994May12.130657.6505@u-tokyo.ac.jp>
Organization: Universidad Nacional Autónoma de México (DGSCA)
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In article <1994May12.130657.6505@u-tokyo.ac.jp>, imoreno@u-tokyo.ac.jp (Ines Moreno) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).
> A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.

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

-- 
=== Dmitri Souza ===
Dept of Electrical Engineering, Universidad Nacional Autónoma de México (DGSCA)
"Hardware is temporary. The signal survives."

From snovak@unam.mx Fri May 13 14:37:57 1994
Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!snovak
From: snovak@unam.mx (Sven Novak)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994May13.143757.6712@unam.mx>
Date: Fri, 13 May 1994 14:37:57 GMT
References: <1994May12.130657.6505@u-tokyo.ac.jp>
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In article <1994May12.130657.6505@u-tokyo.ac.jp>, imoreno@u-tokyo.ac.jp (Ines Moreno) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).

Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field.

-- 
Sven Novak
Opinions expressed are solely my own and not those of Universidad Nacional Autónoma de México (DGSCA).
------------------------------------------------------------

From tkuznetsov@ox.ac.uk Sun May 15 10:26:57 1994
Path: ashpoly!cascade!mxgate!coyoacan!ox!tkuznetsov
From: tkuznetsov@ox.ac.uk (Tomas Kuznetsov)
Newsgroups: comp.sys.m68k
Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994May15.102657.7974@ox.ac.uk>
Date: Sun, 15 May 1994 10:26:57 GMT
References: <1994May12.130657.6505@u-tokyo.ac.jp>
Organization: Oxford University Computing Laboratory
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In article <1994May12.130657.6505@u-tokyo.ac.jp>, imoreno@u-tokyo.ac.jp (Ines Moreno) writes:
> Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882).
> A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions.

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

Netscape 1.1 crashes when loading large preformatted text. Stick to rn or tin!

-- 
Tomas Kuznetsov | tkuznetsov@ox.ac.uk
PGP Key fingerprint: E81B C3B5 6F65 9854
"Keep the channels open."