From pgirard@u-tokyo.ac.jp Tue Aug 13 18:06:06 1996 Path: ashpoly!cascade!transat!ukc!fennimore!u-tokyo!pgirard From: pgirard@u-tokyo.ac.jp (Pavel Girard) Newsgroups: comp.sys.m68k Subject: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Aug13.180606.4676@u-tokyo.ac.jp> Date: Tue, 13 Aug 1996 18:06:06 GMT Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: NewsWatcher 2.0b24 Lines: 11 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. A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. Make sure you install the 32-bit Enabler on older IIci machines running System 7.1! -- Pavel Girard *PLONK* filter active for trolls. Decstation 5000/200 - NetBSD 1.0 From asouza@uu.net Tue Aug 13 23:38:06 1996 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!uu!asouza From: asouza@uu.net (Anton Souza) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Aug13.233806.3889@uu.net> Date: Tue, 13 Aug 1996 23:38:06 GMT References: <1996Aug13.180606.4676@u-tokyo.ac.jp> Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Aug13.180606.4676@u-tokyo.ac.jp>, pgirard@u-tokyo.ac.jp (Pavel Girard) 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. -- Anton Souza "Marcus is not one man." Mac IIci / 68882 FPU / TOS 4.04