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           Rate   normal     goto      amp unrolled
normal   7.91/s       --     -75%     -91%     -95%
goto     31.9/s     304%       --     -63%     -81%
amp      85.5/s     981%     168%       --     -50%
unrolled  169/s    2044%     431%      98%       --

use strict;
use warnings;
no warnings 'recursion';
...
        }
    }
}