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      1 /*
      2  ** Copyright 2003-2010, VisualOn, Inc.
      3  **
      4  ** Licensed under the Apache License, Version 2.0 (the "License");
      5  ** you may not use this file except in compliance with the License.
      6  ** You may obtain a copy of the License at
      7  **
      8  **     http://www.apache.org/licenses/LICENSE-2.0
      9  **
     10  ** Unless required by applicable law or agreed to in writing, software
     11  ** distributed under the License is distributed on an "AS IS" BASIS,
     12  ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  ** See the License for the specific language governing permissions and
     14  ** limitations under the License.
     15  */
     16 
     17 
     18 /*--------------------------------------------------------------------------*
     19  *                         MATH_OP.H                                        *
     20  *--------------------------------------------------------------------------*
     21  *       Mathematical operations                        *
     22  *--------------------------------------------------------------------------*/
     23 
     24 #ifndef __MATH_OP_H__
     25 #define __MATH_OP_H__
     26 
     27 Word32 Isqrt(                              /* (o) Q31 : output value (range: 0<=val<1)         */
     28         Word32 L_x                            /* (i) Q0  : input value  (range: 0<=val<=7fffffff) */
     29         );
     30 
     31 void Isqrt_n(
     32         Word32 * frac,                        /* (i/o) Q31: normalized value (1.0 < frac <= 0.5) */
     33         Word16 * exp                          /* (i/o)    : exponent (value = frac x 2^exponent) */
     34         );
     35 
     36 Word32 Pow2(                               /* (o) Q0  : result       (range: 0<=val<=0x7fffffff) */
     37         Word16 exponant,                      /* (i) Q0  : Integer part.      (range: 0<=val<=30)   */
     38         Word16 fraction                       /* (i) Q15 : Fractionnal part.  (range: 0.0<=val<1.0) */
     39        );
     40 
     41 Word32 Dot_product12(                      /* (o) Q31: normalized result (1 < val <= -1) */
     42         Word16 x[],                           /* (i) 12bits: x vector                       */
     43         Word16 y[],                           /* (i) 12bits: y vector                       */
     44         Word16 lg,                            /* (i)    : vector length                     */
     45         Word16 * exp                          /* (o)    : exponent of result (0..+30)       */
     46         );
     47 
     48 Word32 Dot_product12_asm(                      /* (o) Q31: normalized result (1 < val <= -1) */
     49         Word16 x[],                           /* (i) 12bits: x vector                       */
     50         Word16 y[],                           /* (i) 12bits: y vector                       */
     51         Word16 lg,                            /* (i)    : vector length                     */
     52         Word16 * exp                          /* (o)    : exponent of result (0..+30)       */
     53         );
     54 #endif //__MATH_OP_H__
     55 
     56