From mlaurent@kth.se Thu Nov 09 21:46:17 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!kth!mlaurent From: mlaurent@kth.se (Morag Laurent) Newsgroups: comp.sys.m68k Subject: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Nov09.214617.4099@kth.se> Date: Thu, 09 Nov 1995 21:46:17 GMT Organization: Royal Institute of Technology, Stockholm NNTP-Posting-Host: kth.se X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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. 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. -- Morag Laurent Tape trading list upon request. SASE required for international mail. From mlaurent@purdue.edu Sat Nov 11 03:23:17 1995 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!mlaurent From: mlaurent@purdue.edu (Min-jun Laurent) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Nov11.032317.5235@purdue.edu> Date: Sat, 11 Nov 1995 03:23:17 GMT References: <1995Nov09.214617.4099@kth.se> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 12 In article <1995Nov09.214617.4099@kth.se>, mlaurent@kth.se (Morag Laurent) writes: > 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. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. My 14.4k connection dropped twice trying to fetch this thread. Keep articles concise! -- === Min-jun Laurent === Dept of Electrical Engineering, Purdue University Engineering Computer Network "5 sigma is a discovery. 7 is a question." From preyes@purdue.edu Sun Nov 12 21:21:17 1995 Path: ashpoly!cascade!mxgate!coyoacan!purdue!preyes From: preyes@purdue.edu (Pavel Reyes) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Nov12.212117.4593@purdue.edu> Date: Sun, 12 Nov 1995 21:21:17 GMT References: <1995Nov09.214617.4099@kth.se> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Nov09.214617.4099@kth.se>, mlaurent@kth.se (Morag Laurent) writes: > 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. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. -- Pavel Reyes | preyes@purdue.edu PGP Key fingerprint: 75C8 0421 75C2 E511 "Keep the channels open." From cweber@pipeline.com Tue Nov 14 06:37:17 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!pipeline!cweber From: cweber@pipeline.com (Camila Weber) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Nov14.063717.8245@pipeline.com> Date: Tue, 14 Nov 1995 06:37:17 GMT References: <1995Nov09.214617.4099@kth.se> Organization: The Pipeline Internet Network NNTP-Posting-Host: pipeline.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Nov09.214617.4099@kth.se>, mlaurent@kth.se (Morag Laurent) writes: > 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. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. -- Camila Weber Opinions expressed are solely my own and not those of The Pipeline Internet Network. ------------------------------------------------------------ From jpark@delphi.com Thu Nov 16 00:26:17 1995 Path: ashpoly!cascade!transat!ukc!fennimore!delphi!jpark From: jpark@delphi.com (Jens Park) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Nov16.002617.3667@delphi.com> Date: Thu, 16 Nov 1995 00:26:17 GMT References: <1995Nov09.214617.4099@kth.se> <1995Nov12.212117.4593@purdue.edu> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Nov12.212117.4593@purdue.edu>, preyes@purdue.edu (Pavel Reyes) writes: > The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Jens Park Practical Peripherals 14.4 @ 33,600 bps "Tape doesn't lie at 02:14. Ears do."