Re: Unaligned Accesses (was Re: How to use silicon)

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Article #20576

#20576

From: Henry Spencer
Date: Wed, 29 Mar 1989 23:21

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In article <BRUCE.89Mar28134751@tigger.wv.tek.com> bruce@tigger.wv.tek.com (Bruce Robertson;685-2912;;;tigger) writes:
>... nothing says you can't write a utility to reorder your
>structure members at the C source level, optimizing for a particular
>architecture.  Obviously, you would have to avoid using this utility
>if the order of structure elements matters (you wouldn't want to do it
>to the Unix kernel!)

If you look at the kernel sources, especially the older parts, you'll
find that there is a remarkable tendency for (e.g.) "char" members of
structs to be grouped together so they will pack densely.
-- 
Welcome to Mars!  Your         |     Henry Spencer at U of Toronto Zoology
passport and visa, comrade?    | uunet!attcan!utzoo!henry henry@zoo.toronto.edu

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Message-ID: <1989Mar29.232103.6835@utzoo.uucp>

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<37196@bbn.COM> <1989Mar16.190043.23227@utzoo.uucp> <24889@amdcad.AMD.COM> <355@bnr-fos.UUCP> <13@microsoft.UUCP> <362@bnr-fos.UUCP> <59@microsoft.UUCP> <343@unicads.UUCP> <25000@amdcad.AMD.COM> <BRUCE.89Mar28134751@tigger.wv.tek.com>

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Newsgroups: comp.arch
Path: arc1-ca.pugleaf.net!utzoo!henry
From: henry@utzoo.uucp (Henry Spencer)
Subject: Re: Unaligned Accesses (was Re: How to use silicon)
Message-ID: <1989Mar29.232103.6835@utzoo.uucp>
Organization: U of Toronto Zoology
References: <37196@bbn.COM> <1989Mar16.190043.23227@utzoo.uucp> <24889@amdcad.AMD.COM> <355@bnr-fos.UUCP> <13@microsoft.UUCP> <362@bnr-fos.UUCP> <59@microsoft.UUCP> <343@unicads.UUCP> <25000@amdcad.AMD.COM> <BRUCE.89Mar28134751@tigger.wv.tek.com>
Date: Wed, 29 Mar 89 23:21:03 GMT

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