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sub test0 {
    return ((($_[0] & $_[1]) * 2113665) & 17895697) % 15;
}

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          Rate Test4 Test5 Test7 Test6 Test0
Test4  64233/s    --  -33%  -33%  -52%  -72%
...
Test7  96399/s   50%    1%    --  -28%  -58%
Test6 133602/s  108%   40%   39%    --  -41%
Test0 227756/s  255%  138%  136%   70%    --