//table

static const int8 xs_KotayBits[32] =

{

0, 1, 2, 16, 3, 6, 17, 21,

14, 4, 7, 9, 18, 11, 22, 26,

31, 15, 5, 20, 13, 8, 10, 25,

30, 19, 12, 24, 29, 23, 28, 27

};

//only works for powers of 2 inputs

static inline int32 xs_ILogPow2 (int32 v)

{

//constant is binary 10 01010 11010 00110 01110 11111

return xs_KotayBits[(uint32(v)*uint32( 0x04ad19df ))>>27];

}