Re: eliminating array bounds checking overhead

<mayur_naik@my-deja.com> wrote in message news:00-04-194@comp.compilers...
> Hello
>
> I wish to perform an array lookup of the form:
>
snipped...
> Does any language or any machine
> provide some mechanism to:
>
> 1. index an array without checking its bounds
> 2. throw an exception if the index was actually out of range
> 3. allow the programmer to catch and handle the exception rather than
> terminate the program


If the language did this, it would simply be implementing those
comparisons behind your back. I'm assuming you don't want this.


OTOH, most modern CPUs support memory management which provides the
hardware to achieve exactly what you're looking for. As for letting
the programmer handle this; well, that turns out to be an operating
system feature (unless you're working on the bare metal yourself).


Randy Hyde
[The CPUs I know of only provide page level memory management. x86
CPUs still have segments but nobody uses them because they're slow and
it's hard to generate code for them. -John]

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