Article View: comp.arch
Article #20605Re: Unaligned Accesses
From: Len Lattanzi
Date: Sat, 01 Apr 1989 09:05
Date: Sat, 01 Apr 1989 09:05
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1260 bytes
In article <4618@pt.cs.cmu.edu> lindsay@MATHOM.GANDALF.CS.CMU.EDU (Donald Lindsay) writes:
:
:So far, people have brought up two hardware solutions:
:
: - 1. The CPU can just do it.
: - 2. The CPU can complain (interrupt) when someone tries to do it.
:
:No one has mentioned the third alternative.
:
[ load low byte(s) into low part of register, leave top alone ]
The MIPS R2000 has this instruction and its cohort load high bytes into
high part of register leaving low alone. I'm not positive but I believe that
f77 will generate them for suitably unaligned common members.
Len Lattanzi (len@Synthesis.com) <{ames,pyramid,decwrl}!mips!synthesis!len>
Synthesis Software Solutions, Inc. 1 408 991 0367
292 Commercial Avenue, Sunnyvale, California 94086
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!bloom-beacon!apple!vsi1!daver!mips!synthesis!len From: len@synthesis.Synthesis.COM (Len Lattanzi) Newsgroups: comp.arch Subject: Re: Unaligned Accesses Message-ID: <16372@mips.mips.COM> Date: 1 Apr 89 09:05:49 GMT References: <4618@pt.cs.cmu.edu> Sender: news@mips.COM Reply-To: len@synthesis.synthesis.com (Len Lattanzi) Organization: Synthesis Software Solutions Inc, Sunnyvale, CA Lines: 19