Re: Clever UNIX/C Constructs

[bmorris@xxxxxxxxxx]

>Date: Thu, 4 Jan 2001 16:20:09 -0500
>From: Jon.Paris@hal.it
>
> >> Oh yeah, also performance.  Consider the statements:
>
> >>       Totals(FindItem('xyz')) += incr;
> >>       Totals(FindItem('xyz')) = Totals(FindItem('xyz')) + incr;
>
>Isn't that more of a lack of optimization in the compiler and/or
optimizing
>tranlator than a performance issue Hans?

Maybe, if the compiler or optimizer had a way to know that the function
FindItem was a true function with no side-effects.  But in this case,
FindItem would probably be looking up 'xyz' in a file; I don't think it
would be possible for even the most sophisticated optimizer to figure out
that FindItem only needs to be called once.

Barbara Morris


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