ref: 8ce8649604f903ad48951be7921a0ee3650c80b8
dir: /amr-wb/math_op.h/
/*--------------------------------------------------------------------------*
* MATH_OP.H *
*--------------------------------------------------------------------------*
* Mathematical operations *
*--------------------------------------------------------------------------*/
Word32 Isqrt( /* (o) Q31 : output value (range: 0<=val<1) */
Word32 L_x /* (i) Q0 : input value (range: 0<=val<=7fffffff) */
);
void Isqrt_n(
Word32 * frac, /* (i/o) Q31: normalized value (1.0 < frac <= 0.5) */
Word16 * exp /* (i/o) : exponent (value = frac x 2^exponent) */
);
Word32 Pow2( /* (o) Q0 : result (range: 0<=val<=0x7fffffff) */
Word16 exponant, /* (i) Q0 : Integer part. (range: 0<=val<=30) */
Word16 fraction /* (i) Q15 : Fractionnal part. (range: 0.0<=val<1.0) */
);
Word32 Dot_product12( /* (o) Q31: normalized result (1 < val <= -1) */
Word16 x[], /* (i) 12bits: x vector */
Word16 y[], /* (i) 12bits: y vector */
Word16 lg, /* (i) : vector length */
Word16 * exp /* (o) : exponent of result (0..+30) */
);