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Generation took: 0.218580069542 seconds
 Shift&and took: 0.000000471000 seconds
   Lookup  took: 0.000000395095 seconds

my $start = time;
for (1..100) {
my @lookup; $#lookup = 0x3ffff;
...
    for 0 .. 0x3ffff;
}
printf "Generation took: %.12f seconds\n", ( time() - $start )/100;