www.pudn.com > SMV_Code.rar > math_ext40.c
/*=========================================================================*/
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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);
}
/*---------------------------------------------------------------------------*/
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/*----------------------------------- END ------------------------------------*/
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