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From: davec@nucleus.amd.com (Dave Christie)
Newsgroups: comp.arch
Subject: Re: Is handling off-alignment impor
Message-ID: <1990Aug17.155925.1588@mozart.amd.com>
Date: 17 Aug 90 15:59:25 GMT
References: <12459@encore.Encore.COM> <3300161@m.cs.uiuc.edu>
Sender: usenet@mozart.amd.com (Usenet News)
Reply-To: davec@nucleus.amd.com (Dave Christie)
Organization: Advanced Micro Devices, Inc., Austin, Texas
Lines: 19

In article <3300161@m.cs.uiuc.edu> marick@m.cs.uiuc.edu writes:
>
>>[in some other article someone understandably writes:]
>>>    As someone who went through a conversion from MVS to MVS/XA I find
>>>this perfectly horrible.
>
>One of the easier parts of porting Powernode lisp to the NP was
>dealing with the fact that tag bits were now valid address bits.  We
>knew how we'd do it well in advance.
>
>Taking advantage of architectural quirks isn't automatically evil.
>You just have to weigh the costs against the benefits.

Unless you know what the architects might come up with in the future
in the way of architectural extensions, you can't know all the possible
costs.

--------------------
Dave Christie                My opinions only.