On Linux with Perl5.6.0: 
$ perl -MO=Deparse -we '$x=[];for($i=0;$i<=$#x;$i++){}'
$x = [];
$i = 0;
while ($i <= $#x) {
    ();
}
continue {
    ++$i
}
-e syntax OK
Screamer is right - but thanks for preaching anyway, not all of us are 'converted' just yet. ;)

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)

In reply to (jeffa) 3Re: Is for(@$array_ref) construct optimized? YES! by jeffa
in thread Is for(@$array_ref) construct optimized? YES! by Weasel

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