Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site ist.UUCP Path: utzoo!watmath!clyde!cbosgd!cbdkc1!desoto!cord!hudson!bentley!hoxna!houxm!mhuxr!ulysses!allegra!mit-eddie!godot!harvard!seismo!mcvax!ukc!qtlon!ist!jmc From: jmc@ist.UUCP (John Collins) Newsgroups: net.micro.68k,net.micro Subject: Re: MC68881 Floating-point performance times Message-ID: <276@ist.UUCP> Date: Thu, 20-Dec-84 16:28:58 EST Article-I.D.: ist.276 Posted: Thu Dec 20 16:28:58 1984 Date-Received: Sun, 23-Dec-84 00:44:47 EST References: <263@oakhill.UUCP> <896@utastro.UUCP>, <612@turtlevax.UUCP> Organization: Imperial Software Technology, London, England Lines: 16 Xref: watmath net.micro.68k:497 net.micro:8964 I remember in my student days using an IBM 370/165 and discovering that double was FASTER than single precision floating, since the microcode did everything in double precision and the single ops were done by padding the operands and truncating the results..... Maybe that is the rationale for C working in double.... (What was fun was when some user rang up when I was doing "progam advisor" duty and said "How much slower will my program run if I run it in double precision" - a silly question to which I could truthfully answer "It'll run faster!!) -- John Collins calling courtesy of ist Please reply to ...!mcvax!ist!inset!jmc Phone: +44 727 57267 Snail: 47 Cedarwood Drive, St Albans, Herts, AL4 0DN, England