From awatanabe@uni-hamburg.de Fri Sep 16 08:02:10 1994 Path: ashpoly!cascade!transat!sunet!nordrelay!uni-hamburg!awatanabe From: awatanabe@uni-hamburg.de (Anja Watanabe) Newsgroups: comp.sys.m68k Subject: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Sep16.080210.5562@uni-hamburg.de> Date: Fri, 16 Sep 1994 08:02:10 GMT Organization: Universität Hamburg Fachbereich Informatik NNTP-Posting-Host: uni-hamburg.de X-Newsreader: TIN [version 1.2 PL2] 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? -- Anja Watanabe "Measuring a record you own is listening, not piracy." Pentium 90 (OS/2 Warp) / System 7.5.1 From pkim@u-tokyo.ac.jp Fri Sep 16 15:06:10 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!u-tokyo!pkim From: pkim@u-tokyo.ac.jp (Pavel Kim) Newsgroups: comp.sys.m68k Subject: Re: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Sep16.150610.5100@u-tokyo.ac.jp> Date: Fri, 16 Sep 1994 15:06:10 GMT References: <1994Sep16.080210.5562@uni-hamburg.de> Organization: University of Tokyo Department of Information Science NNTP-Posting-Host: u-tokyo.ac.jp X-Newsreader: TIN [version 1.2 PL2] Lines: 11 In article <1994Sep16.080210.5562@uni-hamburg.de>, awatanabe@uni-hamburg.de (Anja Watanabe) 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. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. Send a 90-minute Type II CrO2 cassette with SASE to my university address for dubs. -- Pavel Kim -- University of Tokyo Department of Information Science "The hatch is open. Is anyone listening?"