From: "willy tarreau" <wtarreau@yahoo.fr>
To: "Albert D. Cahalan" <acahalan@cs.uml.edu>
Cc: linux-kernel@vger.kernel.org
Subject: Re: [Q] Looking for an emulation for CMOV* instructions.
Date: Sat, 12 Jan 2002 10:00:17 +0100 (CET) [thread overview]
Message-ID: <20020112090017.87174.qmail@web20501.mail.yahoo.com> (raw)
In-Reply-To: <200201111845.g0BIjS2318104@saturn.cs.uml.edu>
> Gee, when was the last time Intel removed something
> from the instruction set? An old 80286 instruction
> comes to mind, but that was a super-CISC mess that
> was really specific to the implementation. Anything
> really useful that was ever removed?
well, the 8088/8086 supported the POP CS instruction
which was used by a virus and 80186/80286 broke this
virus (which was rewritten anyway).
The undocumented loadall instruction changes from
CPU to CPU, and the IBTS/XBTS bit string manipulation
instructions appeared in Step A 386 and disappeared
later. The Step A 486 reused their opcodes for CMPXCHG
and it changed just after in Step B.
This are very rare cases, but at least some
developpers could have based their work on the
existence of IBTS/XBTS but it disappeared.
Anyway, I cannot imagine that they could break
compatibility by removing CMOV !
Regards,
Willy
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next parent reply other threads:[~2002-01-12 9:00 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200201111845.g0BIjS2318104@saturn.cs.uml.edu>
2002-01-12 9:00 ` willy tarreau [this message]
2002-01-12 18:57 ` Alan Cox
2002-01-12 10:48 Adam J. Richter
2002-01-12 11:25 ` David Weinehall
2002-01-12 13:18 ` Brian Gerst
2002-01-12 20:43 ` H. Peter Anvin
[not found] <m26669olcu.fsf@goliath.csn.tu-chemnitz.de.suse.lists.linux.kernel>
[not found] ` <E16Oocq-0005tX-00@the-village.bc.nu.suse.lists.linux.kernel>
2002-01-11 9:54 ` Andi Kleen
2002-01-12 6:31 ` Pavel Machek
2002-01-12 7:52 ` H. Peter Anvin
-- strict thread matches above, loose matches on Subject: below --
2002-01-11 9:25 willy tarreau
2002-01-11 17:55 ` Ronald Wahl
[not found] <fa.eln67tv.a4io16@ifi.uio.no>
[not found] ` <fa.gp0gofv.1p4se16@ifi.uio.no>
2002-01-11 8:12 ` Giacomo Catenazzi
2002-01-10 23:08 Ronald Wahl
2002-01-10 23:28 ` Alan Cox
2002-01-11 0:08 ` Ronald Wahl
2002-01-11 0:26 ` Alan Cox
2002-01-11 0:39 ` Ronald Wahl
2002-01-11 0:54 ` Alan Cox
2002-01-11 1:09 ` Martin Eriksson
2002-01-11 1:42 ` Timothy Covell
2002-01-11 2:16 ` Alan Cox
2002-01-11 18:24 ` Ronald Wahl
2002-01-11 22:18 ` Richard Henderson
2002-01-11 23:07 ` Alan Cox
2002-01-11 23:26 ` Albert D. Cahalan
2002-01-11 23:40 ` Alan Cox
2002-01-16 15:18 ` Jamie Lokier
2002-01-16 16:16 ` Richard B. Johnson
2002-01-16 17:48 ` Ronald Wahl
2002-01-16 17:30 ` Dave Jones
2002-01-17 11:54 ` Maciej W. Rozycki
2002-01-11 19:59 ` Hans-Peter Jansen
2002-01-11 20:05 ` Ronald Wahl
2002-01-11 23:19 ` Alan Cox
2002-01-12 6:27 ` Pavel Machek
2002-04-12 20:48 ` H. Peter Anvin
2002-01-12 6:34 ` Pavel Machek
2002-01-18 17:38 ` David Woodhouse
2002-01-18 22:01 ` Pavel Machek
2002-01-11 23:25 ` Alistair Riddell
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