Subject:
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Re: Sharing variables and using expressions (was Re: NQC 2.0 and some math questions
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Newsgroups:
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lugnet.robotics.rcx.nqc
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Date:
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Mon, 1 Nov 1999 21:48:44 GMT
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Viewed:
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2642 times
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Thanks, Dave! It will be good to have that in the manual, because it is a very
confusing behavior that is difficult to track down. Variables take on values
that are completely different from the values that the programmer is setting
them to. Most programmers would have been completely stuck.
In lugnet.robotics.rcx.nqc, Dave Baum writes:
> The optimization was intentional (and quite a lot of work, actually). I
> know it breaks with multiple tasks, but I was more concerned with keeping
> the variable pool from being cluttered with temporaries. [...]
> This does warrant additional discussion in the manual, so I will add it
> when I get some free time.
>
> In article <FJv8wM.99v@lugnet.com>, "Robert Munafo" <munafo@gcctechNO.SPAMcom> • wrote:
>
> > I have discovered a somewhat non-intuitive feature of NQC (in my version, at
> > least, which is pre-2.0) [...]
> > var = (20 * var) / 21;
> > gets compiled into:
> > MUL var, 20 ; var = var * 20
> > DIV var, 21 ; var = var / 21
> > [causing var to sometimes take on an unexpected huge value]
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