From mmoreau@illinois.edu Fri Feb 03 08:25:15 1995
Path: ashpoly!cascade!brgate!saturno!illinois!mmoreau
From: mmoreau@illinois.edu (Marta Moreau)
Newsgroups: comp.sys.m68k
Subject: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Feb03.082515.9296@illinois.edu>
Date: Fri, 03 Feb 1995 08:25:15 GMT
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Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow.
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?

-- 
Marta Moreau
Tape trading list upon request. SASE required for international mail.

From kmuller@uni-hamburg.de Sat Feb 04 19:48:15 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!uni-hamburg!kmuller
From: kmuller@uni-hamburg.de (Katrin Müller)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Feb04.194815.1398@uni-hamburg.de>
Date: Sat, 04 Feb 1995 19:48:15 GMT
References: <1995Feb03.082515.9296@illinois.edu>
Organization: Universität Hamburg Fachbereich Informatik
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In article <1995Feb03.082515.9296@illinois.edu>, mmoreau@illinois.edu (Marta Moreau) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.
> Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow.

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

PGP Public key available via finger or upon request.

-- 
Katrin Müller -- Universität Hamburg Fachbereich Informatik
"Row 14. No joke."

From rkang@mit.edu Mon Feb 06 10:31:15 1995
Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!mit!rkang
From: rkang@mit.edu (Raj Kang)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Feb06.103115.4600@mit.edu>
Date: Mon, 06 Feb 1995 10:31:15 GMT
References: <1995Feb03.082515.9296@illinois.edu>
Organization: Massachusetts Institute of Technology
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In article <1995Feb03.082515.9296@illinois.edu>, mmoreau@illinois.edu (Marta Moreau) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.
> Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow.

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

-- 
Raj Kang
Tape trading list upon request. SASE required for international mail.