Path: utzoo!mnetor!uunet!seismo!sundc!pitstop!texsun!texsun.central-relay.sun.com!convex!authorplaceholder
From: hutchson@convex.UUCP
Newsgroups: comp.arch
Subject: Re: Shift and Subtract is NOT Multiply
Message-ID: <63900013@convex>
Date: 3 Mar 88 15:20:00 GMT
References: <7276@sol.ARPA>
Lines: 8
Nf-ID: #R:sol.ARPA:-727600:convex:63900013:000:451
Nf-From: convex.UUCP!hutchson    Mar  3 09:20:00 1988


The GE-600 and its successor machines had something very like this.  The
floating-point overflow was set (but not cleared) by floating-point
arithmetic operations.  An interrupt would be taken immediately upon an
operation that yielded floating-point overflow IF the "floating-point
overflow mask" bit in the PSW was not set.
     There was a conditional transfer instruction (TOV, I believe) that
tested and cleared the floating-point overflow bit.