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 switch(len) {
    case 11: c+=((unsigned int)k[10]<<24);
...
    case 1 : a+=k[0];
     /* case 0: nothing left to add */
}

    goto 'LAST'.$len;
    LAST11: $c+= $k[10] <<24;
...
    LAST2:  $a+= $k[1]  <<8;
    LAST1:  $a+= $k[0];
    LAST0: