Xref: utzoo comp.arch:3802 comp.sys.m68k:801 comp.misc:2047 sci.crypt:921
Path: utzoo!mnetor!uunet!portal!atari!imagen!geof
From: geof@imagen.UUCP (Geoffrey Cooper)
Newsgroups: comp.arch,comp.sys.m68k,comp.misc,sci.crypt
Subject: Re: conversion algorithm, floating pt formats
Message-ID: <1621@imagen.UUCP>
Date: 4 Mar 88 05:50:15 GMT
References: <3910@batcomputer.tn.cornell.edu>
Distribution: comp
Organization: IMAGEN Corporation, Santa Clara, CA 95052-8101
Lines: 13
Keywords: IEEE format to BCD format, 68881,C
Summary: 68881 does it all

In article <3910@batcomputer.tn.cornell.edu>, padama@batcomputer.tn.cornell.edu (padama) writes:
> Does anyone know of an algorithm for converting IEEE format floating point
> numbers to bcd floating point?

You're in luck.  BCD and IEEE are two formats supported by the 68881
hardware.  The machine co-instructions of the 68881-68020 combination
include commands to fetch a number from either format into a register
and write it back in either format.  So you can accomplish what you want
in two 68881 FMOVE.x instructions.  See the manual for details.

- Geof
-- 
{decwrl,sun,saber}!imagen!geof