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From: bcase@amdcad.UUCP
Newsgroups: comp.arch
Subject: Re: register window machine questions
Message-ID: <14974@amdcad.UUCP>
Date: Wed, 25-Feb-87 18:14:41 EST
Article-I.D.: amdcad.14974
Posted: Wed Feb 25 18:14:41 1987
Date-Received: Fri, 27-Feb-87 23:10:48 EST
References: <4376@columbia.UUCP>
Reply-To: bcase@amdcad.UUCP (Brian Case)
Organization: Advanced Micro Devices, Sunnyvale, California
Lines: 17

In article <4376@columbia.UUCP> eppstein@tom.columbia.edu (David Eppstein) writes:
>Register window machines such as the Berkeley RISCs have been discussed
>recently in this group.  I have some questions about these architectures:
>
>(3) Are there machines with both dynamic (windowed) and static (normal)
>registers?  For instance it might be useful for quick O.S. interrupts to
>use only statics and not go to the trouble of setting up a register
>window stack (which would involve lots of reads and writes moving the
>old stack completely out to memory and then back again later).  Static
>registers could also be useful for non-local variables.

The Pyramid machine has 16 "global" registers that are addressable by all
procedures; i.e., they are a part of every procedure context.

    bcase
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