>>>>> On Wed, 20 Feb 2002 14:24:42 -0300 (BRT), Rik van Riel <riel@conectiva.com.br> said:
Rik> On Wed, 20 Feb 2002, Mike Fedyk wrote:
>> What's the difference between these two architectures? Intel
>> 64bit processor and AMD's upcoming 64bit processor?
Rik> One is a 64 bit extension to a modern superscalar architecture
Rik> which has descended from 8 bit machines over the ages.
Interesting opinion.
Rik> The other is a 3-issue VLIW follow-up to the 2-issue VLIW i860.
There are some factual errors in this statement:
The ia64 _architecture_ places no limit on how many instructions can
be issued at a time. You could have an instruction group that's
thousands of instructions long which could all be executed in a single
cycle. Of course, realistic CPUs will bound the number of
instructions that can be issued in parallel. The Itanium and McKinley
_implementations_ of ia64 happen to issue up to 6 instructions at a
time, but other issue-widths are possible.
To the best of my knowledge, i860 had virtually no influence on ia64.
Cydrome's Cydra5 and Multiflow's TRACE did, as did PA-RISC.
Thanks,
--david
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sat Feb 23 2002 - 21:00:26 EST