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Subject: Re: Bounds Check Overhead
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Date: Sat, 27 May 2006 14:29:34 GMT
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Date: 2006-05-27T14:29:34+00:00
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"Dan Nagle" <dannagle@verizon.net> wrote in message
news:3cBdg.6255$oa3.2407@trnddc08...
> Ludovic Brenta wrote:

> > And that's why Ada specifies that I cannot change inside the loop, and
> > is undefined outside the loop; see ARM 5.5 (9, 10).
> >
> > You seem to imply that Fortran has a similar rule, but that compilers
> > do not enforce that rule, and therefore have to perform range checking
> > to enforce a non-existent language rule about array access.  I am
> > confused.  Could you clarify?
>
> A loop index cannot be changed within the loop.

It's easy enough to do.
Put the index in COMMON or EQUIVALENCE it.
Or call a procedure and pass the loop variable.

What you mean is that it's illegal to change the loop variable.