From lgirard@demon.co.uk Thu Nov 10 12:30:40 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!demon!lgirard From: lgirard@demon.co.uk (Lucia Girard) Newsgroups: comp.sys.m68k Subject: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Nov10.123040.2240@demon.co.uk> Date: Thu, 10 Nov 1994 12:30:40 GMT Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk 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. Anyone running this on a Quadra 840AV with the 68040? -- Lucia Girard Practical Peripherals 14.4 @ 19,200 bps "We don't sign stars. We build them." From tsokolov@demon.co.uk Sat Nov 12 07:18:40 1994 Path: ashpoly!cascade!mxgate!coyoacan!demon!tsokolov From: tsokolov@demon.co.uk (Tomas Sokolov) Newsgroups: comp.sys.m68k Subject: Re: Observation: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Nov12.071840.4621@demon.co.uk> Date: Sat, 12 Nov 1994 07:18:40 GMT References: <1994Nov10.123040.2240@demon.co.uk> Organization: Demon Internet Services UK NNTP-Posting-Host: demon.co.uk X-Newsreader: NewsWatcher 2.0b24 Lines: 9 In article <1994Nov10.123040.2240@demon.co.uk>, lgirard@demon.co.uk (Lucia 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. -- Tomas Sokolov Opinions expressed are solely my own and not those of Demon Internet Services UK. ------------------------------------------------------------