From ygonzalez@inria.fr Wed Jun 28 06:03:22 1995 Path: ashpoly!cascade!bigsur!inria!ygonzalez From: ygonzalez@inria.fr (Yuki González) Newsgroups: comp.sys.m68k Subject: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jun28.060322.5805@inria.fr> Date: Wed, 28 Jun 1995 06:03:22 GMT Organization: INRIA Rocquencourt NNTP-Posting-Host: inria.fr X-Newsreader: Netscape 1.1N 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. Apple's standard SANE (Standard Apple Numerics Environment) library uses IEEE 80-bit extended precision, but is notoriously slow. Make sure you install the 32-bit Enabler on older IIci machines running System 7.1! -- Yuki González US Robotics Courier V.34 @ 14,400 bps "Measuring a record you own is listening, not piracy." From fsmirnov@berkeley.edu Thu Jun 29 23:57:22 1995 Path: ashpoly!cascade!transat!sunet!nordrelay!berkeley!fsmirnov From: fsmirnov@berkeley.edu (Fiona Smirnov) Newsgroups: comp.sys.m68k Subject: Re: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jun29.235722.9305@berkeley.edu> Date: Thu, 29 Jun 1995 23:57:22 GMT References: <1995Jun28.060322.5805@inria.fr> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Jun28.060322.5805@inria.fr>, ygonzalez@inria.fr (Yuki González) writes: > 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. Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. -- Fiona Smirnov Zyxel U-1496E @ 19,200 bps "In theory there is no difference between theory and practice." From oreyes@clari.net Fri Jun 30 06:26:22 1995 Path: ashpoly!cascade!mxgate!coyoacan!clari!oreyes From: oreyes@clari.net (Olga Reyes) Newsgroups: comp.sys.m68k Subject: Re: Data: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Jun30.062622.3936@clari.net> Date: Fri, 30 Jun 1995 06:26:22 GMT References: <1995Jun28.060322.5805@inria.fr> <1995Jun29.235722.9305@berkeley.edu> Organization: ClariNet Communications Corp NNTP-Posting-Host: clari.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 In article <1995Jun29.235722.9305@berkeley.edu>, fsmirnov@berkeley.edu (Fiona Smirnov) writes: > Beware of System 7.5.1 memory leaks if you allocate large sample buffers in the application heap. Use NewPtrSys instead. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Olga Reyes Tape trading list upon request. SASE required for international mail.