From hnilsson@clari.net Thu Mar 14 17:28:58 1996
Path: ashpoly!cascade!bigsur!clari!hnilsson
From: hnilsson@clari.net (Hana Nilsson)
Newsgroups: comp.sys.m68k
Subject: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Mar14.172858.1398@clari.net>
Date: Thu, 14 Mar 1996 17:28:58 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.
Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

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

-- 
Hana Nilsson | hnilsson@clari.net
PGP Key fingerprint: 16D2 7A86 BCA5 09D0
"Keep the channels open."

From hsokolov@kiae.su Fri Mar 15 20:26:58 1996
Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!hsokolov
From: hsokolov@kiae.su (Hugo Sokolov)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Mar15.202658.6833@kiae.su>
Date: Fri, 15 Mar 1996 20:26:58 GMT
References: <1996Mar14.172858.1398@clari.net>
Organization: Kurchatov Institute of Atomic Energy, Moscow
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In article <1996Mar14.172858.1398@clari.net>, hnilsson@clari.net (Hana Nilsson) writes:
> 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.

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

-- 
Hugo Sokolov
Opinions expressed are solely my own and not those of Kurchatov Institute of Atomic Energy, Moscow.
------------------------------------------------------------

From jjohansson@pacbell.net Sat Mar 16 09:24:58 1996
Path: ashpoly!cascade!transat!eunet-fr!teletel!pacbell!jjohansson
From: jjohansson@pacbell.net (Jen Johansson)
Newsgroups: comp.sys.m68k
Subject: Re: [INFO] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1996Mar16.092458.9573@pacbell.net>
Date: Sat, 16 Mar 1996 09:24:58 GMT
References: <1996Mar14.172858.1398@clari.net> <1996Mar15.202658.6833@kiae.su>
Organization: Pacific Bell Internet Services
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In article <1996Mar15.202658.6833@kiae.su>, hsokolov@kiae.su (Hugo Sokolov) writes:
> Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead.

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

-- 
Jen Johansson | jjohansson@pacbell.net
PGP Key fingerprint: 7816 8C37 6883 E474
"Keep the channels open."