From arobertson@illinois.edu Fri Mar 10 17:11:00 1995 Path: ashpoly!bigsur!pacrim!krgate!eunha!illinois!arobertson From: arobertson@illinois.edu (Anja Robertson) Newsgroups: comp.sys.m68k Subject: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Mar10.171100.5041@illinois.edu> Date: Fri, 10 Mar 1995 17:11:00 GMT Organization: University of Illinois Urbana-Champaign NNTP-Posting-Host: illinois.edu X-Newsreader: TIN [version 1.2 PL2] Lines: 11 Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882). 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. -- Anja Robertson "When every node is whole, the channel opens." Mac IIci / 68882 FPU / System 7.5.1 From gsmirnov@inria.fr Sun Mar 12 16:47:00 1995 Path: ashpoly!cascade!transat!eunet-fi!relcom!kiae!inria!gsmirnov From: gsmirnov@inria.fr (Graham Smirnov) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Mar12.164700.2028@inria.fr> Date: Sun, 12 Mar 1995 16:47:00 GMT References: <1995Mar10.171100.5041@illinois.edu> Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: WinVN 0.99.5 Lines: 11 In article <1995Mar10.171100.5041@illinois.edu>, arobertson@illinois.edu (Anja Robertson) writes: > Benchmarking various C compilers and FPU math libraries on a Macintosh IIci (25 MHz 68030 + 68882). The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. Unsubscribe me from this list! (Wait, this is Usenet, never mind). -- Graham Smirnov | gsmirnov@inria.fr PGP Key fingerprint: E948 619B 9D61 9CC2 "Keep the channels open." From fschneider@kiae.su Tue Mar 14 15:39:00 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!kiae!fschneider From: fschneider@kiae.su (Fiona Schneider) Newsgroups: comp.sys.m68k Subject: Re: [SPECULATION] Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Mar14.153900.8239@kiae.su> Date: Tue, 14 Mar 1995 15:39:00 GMT References: <1995Mar10.171100.5041@illinois.edu> <1995Mar12.164700.2028@inria.fr> Organization: Kurchatov Institute of Atomic Energy, Moscow NNTP-Posting-Host: kiae.su X-Newsreader: WinVN 0.99.5 Lines: 9 In article <1995Mar12.164700.2028@inria.fr>, gsmirnov@inria.fr (Graham Smirnov) writes: > The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Fiona Schneider *PLONK* filter active for trolls. Commodore Amiga 500 (1MB OCS) - NetBSD 1.0