As you're golfing, there are a few trivial modifications that can save a few characters (update: 4 characters). Omit the semicolons after the sub definitions and for loops, and change ($/*=16)%=O to $/=$/*16%O.
$|=print 3.2;sub O{8*($@-$_)+(1,4,5,6)[$:]}sub
o{(-4,2,1,1)[$:]/O}while($,=++$@){for$:(0..3){
for (0..$@) {for$"
(($/=1) ..$_){
$/=$/* 16%O}
$,-=$/ *o}$,
-=16** $_*o
for-6..- 1}printf
"%x",$,* 16%16}
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