From alindqvist@u-tokyo.ac.jp Fri Sep 15 08:13:59 1995
Path: ashpoly!cascade!bigsur!u-tokyo!alindqvist
From: alindqvist@u-tokyo.ac.jp (Anja Lindqvist)
Newsgroups: comp.sys.m68k
Subject: [FLAME] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Sep15.081359.7300@u-tokyo.ac.jp>
Date: Fri, 15 Sep 1995 08:13:59 GMT
Organization: University of Tokyo Department of Information Science
NNTP-Posting-Host: u-tokyo.ac.jp
X-Newsreader: Netscape 1.1N
Lines: 11

Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

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.

Make sure you install the 32-bit Enabler on older IIci machines running System 7.1!

-- 
=== Anja Lindqvist ===
Dept of Electrical Engineering, University of Tokyo Department of Information Science
"Hold for relay."

From tmoreau@u-tokyo.ac.jp Sun Sep 17 01:48:59 1995
Path: ashpoly!cascade!transat!eunet-de!hansebox!u-tokyo!tmoreau
From: tmoreau@u-tokyo.ac.jp (Tobias Moreau)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Sep17.014859.4201@u-tokyo.ac.jp>
Date: Sun, 17 Sep 1995 01:48:59 GMT
References: <1995Sep15.081359.7300@u-tokyo.ac.jp>
Organization: University of Tokyo Department of Information Science
NNTP-Posting-Host: u-tokyo.ac.jp
X-Newsreader: Netscape 1.1N
Lines: 8

In article <1995Sep15.081359.7300@u-tokyo.ac.jp>, alindqvist@u-tokyo.ac.jp (Anja Lindqvist) writes:
> Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

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

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

From dito@mit.edu Tue Sep 19 03:28:59 1995
Path: ashpoly!cascade!transat!ukc!fennimore!mit!dito
From: dito@mit.edu (Dave Ito)
Newsgroups: comp.sys.m68k
Subject: Re: [FLAME] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1995Sep19.032859.7757@mit.edu>
Date: Tue, 19 Sep 1995 03:28:59 GMT
References: <1995Sep15.081359.7300@u-tokyo.ac.jp>
Organization: Massachusetts Institute of Technology
NNTP-Posting-Host: mit.edu
X-Newsreader: WinVN 0.99.5
Lines: 8

In article <1995Sep15.081359.7300@u-tokyo.ac.jp>, alindqvist@u-tokyo.ac.jp (Anja Lindqvist) writes:
> Can a 1989 Mac IIci decode a 40-minute LP in reasonable time?

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

-- 
Dave Ito
Tape trading list upon request. SASE required for international mail.