Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site oakhill.UUCP Path: utzoo!watmath!clyde!burl!ulysses!allegra!mit-eddie!godot!harvard!seismo!ut-sally!oakhill!davet From: davet@oakhill.UUCP (Dave Trissel) Newsgroups: net.micro.68k,net.micro Subject: MC68881 Floating-point performance times Message-ID: <263@oakhill.UUCP> Date: Mon, 10-Dec-84 05:52:01 EST Article-I.D.: oakhill.263 Posted: Mon Dec 10 05:52:01 1984 Date-Received: Wed, 12-Dec-84 03:30:11 EST Reply-To: davet@oakhill.UUCP (Dave Trissel) Organization: Motorola Inc. Austin, Tx Lines: 47 Xref: watmath net.micro.68k:480 net.micro:8872 Summary: xecuting its instruction stream in parallel. Operations are carried out in strict accordance with the IEEE Floating-point Specification (P754) Rev 10.0 and with 80 bits of precision. The standard clock rate of 16.666 Megahertz is assumed and the times are all in microseconds. INSTRUCTION Reg-to-Reg ----------Memory to Reg--------------- Single Double Extended FMOVE (in) 1.5 3.0 3.4 3.3 FADD/FSUB 2.8 4.3 4.6 4.5 FSGLMUL 3.1 4.6 --- --- FSGLDIV 3.8 5.3 --- --- FMUL 4.0 5.5 5.8 5.7 FDIV 5.9 7.4 7.7 7.6 FSIN/FCOS 23.0 24.5 24.9 24.8 FSINCOS 1 25.5 27.0 27.4 27.3 FTAN 27.2 28.7 29.1 29.0 FASIN 33.8 35.3 35.7 35.6 FACOS 35.9 37.4 37.7 37.6 FATAN 22.7 24.2 25.5 24.4 1 This instruction returns BOTH the sine and cosine of a value. Note that these are only a small portion of functions and instructions available. Anyone having times for transcendentals (including square root) for the National NS32081 would you please post them to me? If there is enough interest in comparing both chips, I will post a timing contrast on the net. Motorola Semiconductor Dave Trissel Austin, Texas {ctvax,ihnp4,seismo,gatech}|ut-sally|oakhill|davet