From atakahashi@cern.ch Tue Dec 06 19:42:12 1994 Path: ashpoly!bigsur!pacrim!krgate!eunha!cern!atakahashi From: atakahashi@cern.ch (Aiko Takahashi) Newsgroups: comp.sys.m68k Subject: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Dec06.194212.9932@cern.ch> Date: Tue, 06 Dec 1994 19:42:12 GMT Organization: European Laboratory for Particle Physics, Geneva NNTP-Posting-Host: cern.ch X-Newsreader: NewsWatcher 2.0b24 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. By passing the -mc68882 compiler flag in Think C, all sin/cos and sqrt operations compile directly to FPU opcodes. Make sure you install the 32-bit Enabler on older IIci machines running System 7.1! -- Aiko Takahashi Hayes Optima 288 @ 33,600 bps "Hardware is temporary. The signal survives." From fwatanabe@stanford.edu Thu Dec 08 04:24:12 1994 Path: ashpoly!cascade!transat!eunet-fr!teletel!stanford!fwatanabe From: fwatanabe@stanford.edu (Fiona Watanabe) Newsgroups: comp.sys.m68k Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Dec08.042412.8327@stanford.edu> Date: Thu, 08 Dec 1994 04:24:12 GMT References: <1994Dec06.194212.9932@cern.ch> Organization: Stanford University Computer Systems Lab NNTP-Posting-Host: stanford.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 8 In article <1994Dec06.194212.9932@cern.ch>, atakahashi@cern.ch (Aiko Takahashi) 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. -- Fiona Watanabe Tape trading list upon request. SASE required for international mail. From jsanchez@berkeley.edu Thu Dec 08 22:24:12 1994 Path: ashpoly!cascade!bigsur!berkeley!jsanchez From: jsanchez@berkeley.edu (Julien Sánchez) Newsgroups: comp.sys.m68k Subject: Re: Question: Benchmarking FFT routines on Mac IIci with MC68882 FPU under System 7.5 Message-ID: <1994Dec08.222412.9084@berkeley.edu> Date: Thu, 08 Dec 1994 22:24:12 GMT References: <1994Dec06.194212.9932@cern.ch> Organization: UC Berkeley Department of EECS NNTP-Posting-Host: berkeley.edu X-Newsreader: NewsWatcher 2.0b24 Lines: 12 In article <1994Dec06.194212.9932@cern.ch>, atakahashi@cern.ch (Aiko Takahashi) 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. Mac users bragging about 6-minute render times while Unix workstations do it in 20 seconds. Classic Apple distortion field. Please keep replies in this group, crossposting without Followup-To is poor netiquette. -- Julien Sánchez *PLONK* filter active for trolls. Macintosh IIfx - NetBSD 1.0