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42 int32 power_1_third( int32 xx)
45     int32           xx,                     int32 in the [0, 8192] range
49     int32           xx^(1/3)                int32 Q26 number representing
154 int32 power_1_third(int32 xx)
157     if (xx <= 512)
159         return (power_one_third[xx] >> 1);
163         if (xx >> 15)
169             int32 x = xx;
170             int32 m = 22 - pvmp3_normalize(xx);
172             xx >>= m;
173             xx = (power_one_third[xx]) + (((power_one_third[xx+1] - power_one_third[xx]) >> m) * (x & ((1 << m) - 1)));
174             return (fxp_mul32_Q30(xx, two_cubic_roots[m]));