Messages in this thread |  | | Subject | Re: AMD (fwd) | Date | Sat, 21 Dec 96 22:18:11 PST | From | Craig Milo Rogers <> |
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>: 1) No. AMD5x86 only has 486 instructions. Pentium has Pentium >: instructions. ... >I'd say that this response does absolutely nothing to clarify things. >Sure, a Pentium is a Pentium, and an AMD5x86 is not. Thanks for >pointing that out to us. Now, as far as I know, there are no user >level instructions in the Pentium that are not found in the 486.
I've excerpted and amplified the relevant text from the Pentium(R) Processor Family Developer's Manual, Volume 3: Architecture and Programming Manual, a PDF file downloadable from:
http://developer.intel.com/design/pentium/manuals/pent4.htm
Section 23.2.7.1: NEW PENTIUM PROCESSOR INSTRUCTIONS
The Pentium Processor introduces three new application instructions:
* CMPXCHG8B instruction
Compare and exchange 8 bytes
* CPUID instruction
Get CPU identification information
* RDTSC instruction
Read the timestamp counter
For comparison, from section 23.2.7.2 of the same document, the 486 added three application-level instructions beyond the 386's repetoir:
* BSWAP instruction
* XADD instruction
* CMPXCHG instruction
Craig Milo Rogers
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