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From: linley@hpcuhe.cup.hp.com (Linley Gwennap)
Newsgroups: comp.arch
Subject: Re: SPECmarks/MHz (was Re: More Snake bytes.)
Message-ID: <32580011@hpcuhe.cup.hp.com>
Date: 1 Apr 91 23:24:06 GMT
References: <69465@brunix.UUCP>
Organization: PA-RISC Marketing Central
Lines: 16

An error has been pointed out in my previous detailed posting on the
Snakes processor.  I would like to correct it.  I apologize for the
confusion.

> Although Snakes is not superscalar, PA-RISC instructions such  as  ADD  AND
> BRANCH,  MOVE  AND  BRANCH and COMPARE AND BRANCH allow a similar amount of
> parallelism as America for integer-only applications; in fact, the ratio of
> Integer  SPECmarks  to  MHz  for  Snakes (65/66) actually exceeds America's
> (35/42).

In fact, the Series 730 produces about 50 Integer SPECmarks, not 65.  Thus,
the ISPEC/MHz ratio is about 75%, as opposed to about 83% on IBM's America.
Still, by this measure, the Series 730 exceeds all non-superscalar systems
that I am familiar with.
						--Linley Gwennap
						  Hewlett-Packard