From sjohansson@inria.fr Sun Sep 15 19:27:28 1996 Path: ashpoly!cascade!transat!sunet!nordrelay!inria!sjohansson From: sjohansson@inria.fr (Steve Johansson) Newsgroups: comp.sys.m68k Subject: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Sep15.192728.7772@inria.fr> Date: Sun, 15 Sep 1996 19:27:28 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N Lines: 11 Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. 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. -- Steve Johansson *PLONK* filter active for trolls. Mac IIci / 68882 FPU - NetBSD 1.0 From ljohansson@mindspring.com Mon Sep 16 15:57:28 1996 Path: ashpoly!cascade!transat!eunet-fr!teletel!mindspring!ljohansson From: ljohansson@mindspring.com (Lucia Johansson) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Sep16.155728.5298@mindspring.com> Date: Mon, 16 Sep 1996 15:57:28 GMT References: <1996Sep15.192728.7772@inria.fr> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: Netscape 1.1N Lines: 10 In article <1996Sep15.192728.7772@inria.fr>, sjohansson@inria.fr (Steve Johansson) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? > A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Lucia Johansson | ljohansson@mindspring.com PGP Key fingerprint: 3027 38F5 FCD7 6333 "Keep the channels open." From dnovak@unam.mx Wed Sep 18 07:47:28 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!dnovak From: dnovak@unam.mx (Diego Novak) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Sep18.074728.9959@unam.mx> Date: Wed, 18 Sep 1996 07:47:28 GMT References: <1996Sep15.192728.7772@inria.fr> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1996Sep15.192728.7772@inria.fr>, sjohansson@inria.fr (Steve Johansson) writes: > Can a 1989 Mac IIci decode a 40-minute LP in reasonable time? > A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. -- Diego Novak | dnovak@unam.mx PGP Key fingerprint: 9335 C4FC 94A9 5712 "Keep the channels open."