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- Newsgroups: comp.sys.intel
- Path: sparky!uunet!psgrain!hippo!rga1.itrga.sun.ac.za!mostert
- From: mostert@cs.sun.ac.za (A. Mostert)
- Subject: Re: Undocumented instructions in x86 CPUs
- Message-ID: <mostert.55@cs.sun.ac.za>
- Sender: news@hippo.ru.ac.za
- Organization: University of Stellenbosch
- References: <mostert.51@cs.sun.ac.za> <Bx9sv5.1yo@aeon.in-berlin.de>
- Date: Sun, 8 Nov 1992 11:34:12 GMT
- Lines: 11
-
- In article <Bx9sv5.1yo@aeon.in-berlin.de> thomas@aeon.in-berlin.de (Thomas Wolfram) writes:
- >PS: What is the '386 bit string stuff'?
-
- On early 386s there were IBTS and XBTS (Insert/eXtract Bit String)
- instructions, but they were removed in later versions. They are absent in
- all versions of the 486. I don't know the opcodes or exactly what they do.
- +----------------------------------+---------------------------------------+
- | A. Mostert, Stellenbosch, RSA | "WAFTI" - GFMTHC, SLATFATF, D. Adams |
- | mostert@cs.sun.ac.za | |
- |__________________________________|_______________________________________|
-
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