math_ext40.c

EVRC是用于高通公司的语音编码

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/* 3GPP2 standards committee. This document is offered to the        */
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/* or withdraw the statement contained herein. Permission is granted */
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/*===================================================================*/
/* LIBRARY: math_ext40.c                                             */
/*-------------------------------------------------------------------*/
/* PURPOSE: Extended mathematical functions 40bits.                  */
/*===================================================================*/

#include "typedef_fx.h"
#include "basic_op40.h"
#include "math_ext32.h"

/*----------------------------------------------------------------------------*/
/*-------------------------------- FUNCTIONS ---------------------------------*/
/*----------------------------------------------------------------------------*/

/*****************************************************************************
 *                                                                           
 *   Function Name : L_msu40_16_32                                               
 *                                                                           
 *   Purpose :                                                               
 *                                                                          
 *   Multiply var1 by L_var2 and shift the result left by 1. Add the 40   
 *   bit result to acc40 with saturation, return a 40 bit result:           
 *        L_msu(acc40,var1,var2) = L_sub40(acc40,(L_mult40(var1,var2)).        
 *                                                                           
 *   Complexity weight : 1                                                   
 *                                                                           
 *   Inputs :                                                                
 *                                                                          
 *    acc40    40 bit long signed integer (Word40) whose value falls in the 
 *             range : MIN_40 <= L_var3 <= MAX_40.                           
 *                                                                           
 *    var1     16 bit short signed integer (Word16) whose value falls in  
 *             the range : MIN_16 <= var1 <= MAX_16.                         
 *                                                                           
 *    var2     32 bit long signed integer (Word32) whose value falls in  
 *            therange : MIN_32 <= var1 <= MAX_32.                          
 *                                                                           
 *   Return Value :                                                          
 *                                                                           
 *    L_var_out                                                              
 *             40 bit long signed integer (Word40) whose value falls in the  
 *             range : MIN_40 <= L_var_out <= MAX_40.                        
 *****************************************************************************/

Word40 L_msu40_16_32 (Word40 acc40, Word16 var1, Word32 L_var2)
        {
	  Word32 reg32;
	  
	  reg32 = L_mpy_ls(L_var2, var1);
	  acc40 = L_sub40 (acc40, reg32);
	  
	  return (acc40);
	}

/*---------------------------------------------------------------------------*/

/*****************************************************************************
 *                                                                           
 *   Function Name : L_mac40_16_32                                                
 *                                                                           
 *   Purpose :                                                               
 *                                                                          
 *   Multiply var1 by L_var2 and shift the result left by 1. Add the 40   
 *   bit result to acc40 with saturation, return a 40 bit result:           
 *        L_mac(acc40,var1,var2) = L_add40(L_var3,(L_mult40(var1,var2)).        
 *                                                                           
 *   Complexity weight : 1                                                   
 *                                                                           
 *   Inputs :                                                                
 *                                                                          
 *    acc40    40 bit long signed integer (Word40) whose value falls in the 
 *             range : MIN_40 <= L_var3 <= MAX_40.                           
 *                                                                           
 *    var1     16 bit short signed integer (Word16) whose value falls in  
 *             the range : MIN_16 <= var1 <= MAX_16.                         
 *                                                                           
 *    L_var2   32 bit long  signed integer (Word32) whose value falls in  
 *             therange : MIN_32 <= var1 <= MAX_32.                          
 *                                                                           
 *   Return Value :                                                          
 *                                                                           
 *    L_var_out                                                              
 *             40 bit long signed integer (Word40) whose value falls in the  
 *             range : MIN_40 <= L_var_out <= MAX_40.                        
 ******************************************************************************/

Word40 L_mac40_16_32 (Word40 acc40, Word16 var1, Word32 L_var2)
        {
	  Word32 reg32;
	  
	  reg32 = L_mpy_ls(L_var2, var1);
	  acc40 = L_add40 (acc40, reg32);
	  
	  return (acc40);
	}

/*---------------------------------------------------------------------------*/

/*============================================================================*/
/*----------------------------------- END ------------------------------------*/
/*============================================================================*/