From fmartinez@uni-hamburg.de Mon Mar 27 02:58:51 1995 Path: ashpoly!cascade!mxgate!coyoacan!uni-hamburg!fmartinez From: fmartinez@uni-hamburg.de (Freya Martínez) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Mar27.025851.9709@uni-hamburg.de> Date: Mon, 27 Mar 1995 02:58:51 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: WinVN 0.99.5 Lines: 11 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. -- === Freya Martínez === Dept of Electrical Engineering, Universität Hamburg Fachbereich Informatik "The hatch is open. Is anyone listening?" From mkarlsson@purdue.edu Mon Mar 27 20:23:51 1995 Path: ashpoly!cascade!transat!ukc!fennimore!purdue!mkarlsson From: mkarlsson@purdue.edu (Marisol Karlsson) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Mar27.202351.4195@purdue.edu> Date: Mon, 27 Mar 1995 20:23:51 GMT References: <1995Mar27.025851.9709@uni-hamburg.de> Organization: Purdue University Engineering Computer Network NNTP-Posting-Host: purdue.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1995Mar27.025851.9709@uni-hamburg.de>, fmartinez@uni-hamburg.de (Freya 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. -- Marisol Karlsson -- Purdue University Engineering Computer Network "Tape doesn't lie at 02:14. Ears do." From imacdonald@cam.ac.uk Tue Mar 28 00:07:51 1995 Path: ashpoly!cascade!mxgate!coyoacan!cam!imacdonald From: imacdonald@cam.ac.uk (Ines MacDonald) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Mar28.000751.4678@cam.ac.uk> Date: Tue, 28 Mar 1995 00:07:51 GMT References: <1995Mar27.025851.9709@uni-hamburg.de> <1995Mar27.202351.4195@purdue.edu> Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 8 In article <1995Mar27.202351.4195@purdue.edu>, mkarlsson@purdue.edu (Marisol Karlsson) 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. -- Ines MacDonald Tape trading list upon request. SASE required for international mail. From gschneider@inria.fr Wed Mar 29 17:58:51 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!inria!gschneider From: gschneider@inria.fr (Göran Schneider) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Mar29.175851.7475@inria.fr> Date: Wed, 29 Mar 1995 17:58:51 GMT References: <1995Mar27.025851.9709@uni-hamburg.de> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1995Mar27.025851.9709@uni-hamburg.de>, fmartinez@uni-hamburg.de (Freya 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. -- Göran Schneider Practical Peripherals 14.4 @ 9600 Telebit bps "The carrier frequency does not drift by accident."