From mmartinez@panix.com Tue Nov 15 12:47:30 1994
Path: ashpoly!cascade!bigsur!panix!mmartinez
From: mmartinez@panix.com (Mathieu Martínez)
Newsgroups: comp.sys.m68k
Subject: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Nov15.124730.6001@panix.com>
Date: Tue, 15 Nov 1994 12:47:30 GMT
Organization: Public Access Unix of New York
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Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.

Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.
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.

-- 
Mathieu Martínez -- Public Access Unix of New York
"In theory there is no difference between theory and practice."

From ckowalski@clari.net Thu Nov 17 01:00:30 1994
Path: ashpoly!bigsur!pacrim!krgate!eunha!clari!ckowalski
From: ckowalski@clari.net (Camila Kowalski)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Nov17.010030.1360@clari.net>
Date: Thu, 17 Nov 1994 01:00:30 GMT
References: <1994Nov15.124730.6001@panix.com>
Organization: ClariNet Communications Corp
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In article <1994Nov15.124730.6001@panix.com>, mmartinez@panix.com (Mathieu Martínez) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.
> Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

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

-- 
Camila Kowalski -- ClariNet Communications Corp
"5 sigma is a discovery. 7 is a question."

From dsokolov@delphi.com Thu Nov 17 09:41:30 1994
Path: ashpoly!cascade!transat!eunet-fr!teletel!delphi!dsokolov
From: dsokolov@delphi.com (Dong-hyun Sokolov)
Newsgroups: comp.sys.m68k
Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5
Message-ID: <1994Nov17.094130.6524@delphi.com>
Date: Thu, 17 Nov 1994 09:41:30 GMT
References: <1994Nov15.124730.6001@panix.com>
Organization: Delphi Internet Services
NNTP-Posting-Host: delphi.com
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In article <1994Nov15.124730.6001@panix.com>, mmartinez@panix.com (Mathieu Martínez) writes:
> Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining.
> Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes.

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

-- 
Dong-hyun Sokolov -- Delphi Internet Services
"Hardware is temporary. The signal survives."