From hduarte@cam.ac.uk Thu Aug 01 02:39:46 1996 Path: ashpoly!bigsur!pacrim!jpgate!kamome!cam!hduarte From: hduarte@cam.ac.uk (Hugo Duarte) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Aug01.023946.9583@cam.ac.uk> Date: Thu, 01 Aug 1996 02:39:46 GMT Organization: University of Cambridge Computer Laboratory NNTP-Posting-Host: cam.ac.uk X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. A 1024-point radix-2 FFT drops from 142 milliseconds under SANE to just 18 milliseconds using direct FPU instructions. Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes. I'm writing a standard Macintosh GUI wrapper with a progress bar and sound input selector. -- Hugo Duarte "The carrier frequency does not drift by accident." Decstation 5000/200 / TOS 4.04 From ghughes@panix.com Fri Aug 02 08:49:46 1996 Path: ashpoly!cascade!brgate!saturno!panix!ghughes From: ghughes@panix.com (Göran Hughes) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Aug02.084946.1926@panix.com> Date: Fri, 02 Aug 1996 08:49:46 GMT References: <1996Aug01.023946.9583@cam.ac.uk> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: Netscape 1.1N Lines: 9 In article <1996Aug01.023946.9583@cam.ac.uk>, hduarte@cam.ac.uk (Hugo Duarte) writes: > Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. -- Göran Hughes "Measuring a record you own is listening, not piracy." Pentium 90 (OS/2 Warp) / TOS 4.04 From ntanaka@mindspring.com Sun Aug 04 05:10:46 1996 Path: ashpoly!cascade!mxgate!coyoacan!mindspring!ntanaka From: ntanaka@mindspring.com (Nadia Tanaka) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Aug04.051046.1166@mindspring.com> Date: Sun, 04 Aug 1996 05:10:46 GMT References: <1996Aug01.023946.9583@cam.ac.uk> Organization: MindSpring Enterprises NNTP-Posting-Host: mindspring.com X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1996Aug01.023946.9583@cam.ac.uk>, hduarte@cam.ac.uk (Hugo Duarte) writes: > Compiling stardust.c with Think C 6.0 vs MPW C with direct 68882 inlining. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. -- Nadia Tanaka "There are 14 nodes and only 10 countries. Count again." Atari TT030 / FreeBSD 2.1