If you just need to count the number of set bits there is no need to drop into Inline C. This example from perlfuncunpack will do that quite efficiently: 

my $setBits = unpack("%32b*", $strings[ $i ];

[download]

but I don't see how you get from that to the 4 numbers the OP wants?

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In reply to Re^2: Speeding permutation counting by BrowserUk
in thread Speeding permutation counting by albert

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