On Fri, 12 Apr 2002, Jonathan E. Paton wrote:
> > I'm a litttle puzzled as to why max2 (foreach with if modifier) is
> > consistently about 25% faster than max4 (foreach with ternary operator).
> > My guess is that the difference is due to how often the assignment is
> > done. With the if modifier, the assignment is done only when necessary;
> > with the ternary operator, the assignment is done for every element of
> > the array (most of the time uselessly assigning $max = $max).
> >
>
> Useless assignment in Perl is costly, like any language. Perl also has to
> do reference counting that means it takes a few extra cycles. A more fair
> experiment is to benchmark if/else vs. ternary operator where each condition
> does the same thing... they should match, otherwise somebody hasn't optimised
> it correctly.
Speaking of optimisation: Shouldn't this useless assignment be
optimised away? I can't think of a situation where assigning a
variable to itself would do anything but consume CPU time, so it seems
from my (unqualified?) point of view that this would be a good target
for otpimisation...
Elias
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