From mgirard@uu.net Mon Feb 26 18:28:46 1996 Path: ashpoly!cascade!brgate!saturno!uu!mgirard From: mgirard@uu.net (Min-jun Girard) Newsgroups: comp.sys.m68k Subject: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Feb26.182846.3287@uu.net> Date: Mon, 26 Feb 1996 18:28:46 GMT Organization: UUNET Technologies, Falls Church VA NNTP-Posting-Host: uu.net X-Newsreader: WinVN 0.99.5 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. Total execution time for a 20-minute audio track dropped from 48 minutes to 6.2 minutes. Anyone running this on a Quadra 840AV with the 68040? -- Min-jun Girard -- UUNET Technologies, Falls Church VA "There are 14 nodes and only 10 countries. Count again." From eperez@panix.com Tue Feb 27 21:42:46 1996 Path: ashpoly!cascade!brgate!saturno!panix!eperez From: eperez@panix.com (Emi Pérez) Newsgroups: comp.sys.m68k Subject: Re: Discussion: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1996Feb27.214246.2128@panix.com> Date: Tue, 27 Feb 1996 21:42:46 GMT References: <1996Feb26.182846.3287@uu.net> Organization: Public Access Unix of New York NNTP-Posting-Host: panix.com X-Newsreader: WinVN 0.99.5 Lines: 10 In article <1996Feb26.182846.3287@uu.net>, mgirard@uu.net (Min-jun Girard) 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. -- Emi Pérez Zyxel U-1496E @ 28,800 bps "Do not worship the copy."