From ksanchez@uu.net Mon Nov 27 18:42:59 1995 Path: ashpoly!cascade!mxgate!coyoacan!uu!ksanchez From: ksanchez@uu.net (Karen Sánchez) Newsgroups: comp.sys.m68k Subject: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Nov27.184259.7438@uu.net> Date: Mon, 27 Nov 1995 18:42:59 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: TIN [version 1.2 PL2] Lines: 10 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. 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. -- Karen Sánchez -- UUNET Technologies, Falls Church VA "Hold for relay." From jreyes@unam.mx Wed Nov 29 14:10:59 1995 Path: ashpoly!bigsur!pacrim!jpgate!kamome!unam!jreyes From: jreyes@unam.mx (Jens Reyes) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1995Nov29.141059.2001@unam.mx> Date: Wed, 29 Nov 1995 14:10:59 GMT References: <1995Nov27.184259.7438@uu.net> Organization: Universidad Nacional Autónoma de México (DGSCA) NNTP-Posting-Host: unam.mx X-Newsreader: Netscape 1.1N Lines: 10 In article <1995Nov27.184259.7438@uu.net>, ksanchez@uu.net (Karen Sánchez) 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. The 68040 on the Quadra is a monster -- the on-chip FPU executes FFT butterflies in less than 4 milliseconds. -- Jens Reyes "Hardware is temporary. The signal survives." Acorn RiscPC 600 / NEXTSTEP 3.3