Re: Pointer Arithmetic

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#2301

From: Henning Makholm
Date: Sat, 16 Mar 1996 14:51

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schweikh@itosun.ito.uni-stuttgart.de (Jens Schweikhardt) writes:

>- the sizeof int, which might well be 3, 5, or 42.

It's allowed to be, but Real machines hardly use word lengths that are
not either powers of two or quite small (i.e. not exceeding, say, 3
chars), do they?

>- What the instruction set of the machine supports.
>  There may be machines that have instructions to compute
>  base+(index * somesize) [I bet there are!]

i386 and followers have these addressing modes available when running
32-bit and somesize is (I think) either 2, 4 or 8. I'm not sure
whether they're to be preferred over explicit shifts and additions on
later members of the family...

-- 

Henning Makholm - math and CS student - University of Copenhagen
makholm@diku.dk - http://www.diku.dk/students/makholm - fido 2:235/224.92

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From: makholm@diku.dk (Henning Makholm)
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Subject: Re: Pointer Arithmetic
Date: 16 Mar 1996 08:51:04 -0600
Organization: Department of Computer Science, U of Copenhagen
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