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From: braun@m10ux.UUCP
Newsgroups: comp.unix.xenix,comp.sys.intel,comp.sys.ibm.pc
Subject: Re: XENIX 386 benchmark results
Message-ID: <225@m10ux.UUCP>
Date: Wed, 1-Jul-87 14:25:33 EDT
Article-I.D.: m10ux.225
Posted: Wed Jul  1 14:25:33 1987
Date-Received: Fri, 3-Jul-87 05:45:05 EDT
References: <127@spdcc.COM>
Organization: AT&T Bell Labs, Murray Hill
Lines: 17
Summary: What size are ints?
Xref: mnetor comp.unix.xenix:429 comp.sys.intel:283 comp.sys.ibm.pc:5245


After seeing the various benchmarks for 80286, 80386, and 68020's,
I have been wondering: What sizes are the integers used by each machine?
I assume that a 80[012]86 is using 16 bit integers.  I would also suspect
taht a 68020 is benchmarked with 32 bit ints, since that's what you get
from Sun and the other 68020 workstation makers.
What about the 80386?  Are most of these benchmarks done running
the same binary on a '386 as used on the '286?  If so,
what happens to the '386's speed when it runs with 32 bit integers?

By the way, what support does the '386 have for 32 bit arithmetic
and 32 bit addressing?  Is it a new bunch of instructions, or
a different mode for the cpu?
-- 

Doug Braun		AT+T Bell Labs, Murray Hill, NJ
m10ux!braun		201 582-7039