From owner-freebsd-chat Sun Nov 9 11:21:33 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id LAA29452 for chat-outgoing; Sun, 9 Nov 1997 11:21:33 -0800 (PST) (envelope-from owner-freebsd-chat) Received: from sax.sax.de (sax.sax.de [193.175.26.33]) by hub.freebsd.org (8.8.7/8.8.7) with SMTP id LAA29424 for ; Sun, 9 Nov 1997 11:21:21 -0800 (PST) (envelope-from j@uriah.heep.sax.de) Received: (from uucp@localhost) by sax.sax.de (8.6.12/8.6.12-s1) with UUCP id UAA00468; Sun, 9 Nov 1997 20:21:17 +0100 Received: (from j@localhost) by uriah.heep.sax.de (8.8.7/8.8.5) id UAA00618; Sun, 9 Nov 1997 20:02:15 +0100 (MET) Message-ID: <19971109200214.ZJ19808@uriah.heep.sax.de> Date: Sun, 9 Nov 1997 20:02:14 +0100 From: j@uriah.heep.sax.de (J Wunsch) To: freebsd-chat@freebsd.org (FreeBSD chat list) Cc: perlsta@cs.sunyit.edu (Alfred Perlstein), rivers@dignus.com (Thomas David Rivers) Subject: Re: IDT processors? References: X-Mailer: Mutt 0.60_p2-3,5,8-9 Mime-Version: 1.0 X-Phone: +49-351-2012 669 X-PGP-Fingerprint: DC 47 E6 E4 FF A6 E9 8F 93 21 E0 7D F9 12 D6 4E Reply-To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) In-Reply-To: ; from Alfred Perlstein on Nov 9, 1997 12:35:42 -0500 Sender: owner-freebsd-chat@freebsd.org X-Loop: FreeBSD.org Precedence: bulk (Moved to chat.) As Alfred Perlstein wrote: > sorry for the rant, anyone know where can get a bug free chip? someone > has to be making them... :) You're overly optimistic. CPU bugs aren't anything new, and Intel doesn't have a copyright on them either. :-) When i started doing Unix, this was with Data General's DG/UX, somewhere in 1991. After some time, i was trying to debug a program that constantly behaved differently under the debugger than straight- through. With quite a lot of effort, i had to find that the Motorola MC88000 CPU simply botched some flags when doing hardware (instruc- tion-level) tracing. The result of some comparision has been marked `less than', `equal', and `greater then' at the same time. :-O Motorola has fixed the bug in later revisions of their CPU. Data General had even a builtin ``silicon filter'' in their compiler, to work around CPU bugs. Maybe Thomas Rivers can tell us more about it... i know he's been one of the principal gcc hackers with DG back in those days. -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)