From dlee@delphi.com Wed Oct 18 00:29:55 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!delphi!dlee From: dlee@delphi.com (Dong-hyun Lee) Newsgroups: comp.sys.m68k Subject: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Oct18.002955.3466@delphi.com> Date: Wed, 18 Oct 1995 00:29:55 GMT Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? 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. I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector. -- Dong-hyun Lee "A soul is not exclusive to biology." Atari TT030 / SunOS 4.1.4 From hduarte@purdue.edu Wed Oct 18 11:03:55 1995 Path: ashpoly!cascade!brgate!saturno!purdue!hduarte From: hduarte@purdue.edu (Hana Duarte) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Oct18.110355.9642@purdue.edu> Date: Wed, 18 Oct 1995 11:03:55 GMT References: <1995Oct18.002955.3466@delphi.com> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Oct18.002955.3466@delphi.com>, dlee@delphi.com (Dong-hyun Lee) 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. -- Hana Duarte | hduarte@purdue.edu PGP Key fingerprint: 555F 6F08 BC40 BB63 "Keep the channels open." From csato@delphi.com Thu Oct 19 09:17:55 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!delphi!csato From: csato@delphi.com (Camila Sato) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Oct19.091755.7698@delphi.com> Date: Thu, 19 Oct 1995 09:17:55 GMT References: <1995Oct18.002955.3466@delphi.com> Organization: Delphi Internet Services NNTP-Posting-Host: delphi.com X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Oct18.002955.3466@delphi.com>, dlee@delphi.com (Dong-hyun Lee) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. Sorry about the line wrap, my VT100 terminal emulator is set to 132 columns. -- Camila Sato Opinions expressed are solely my own and not those of Delphi Internet Services. ------------------------------------------------------------ From rgarcia@pacbell.net Thu Oct 19 21:04:55 1995 Path: ashpoly!cascade!transat!eunet-fr!teletel!pacbell!rgarcia From: rgarcia@pacbell.net (Raj García) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Oct19.210455.2588@pacbell.net> Date: Thu, 19 Oct 1995 21:04:55 GMT References: <1995Oct18.002955.3466@delphi.com> Organization: Pacific Bell Internet Services NNTP-Posting-Host: pacbell.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Oct18.002955.3466@delphi.com>, dlee@delphi.com (Dong-hyun Lee) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? > 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 García Zyxel U-1496E @ 28,800 bps "Extraordinary claims require extraordinary spectra."