enh1632.c

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/*
  ===========================================================================
   File: ENH1632.C                                       v.2.0 - 15.Nov.2004
  ===========================================================================

            ITU-T        STL        BASIC       OPERATORS

            ENHANCED 16-BIT & 32-BIT ARITHMETIC OPERATORS

   History:
   07 Nov 04   v2.0     Incorporation of new 32-bit / 40-bit / control
                        operators for the ITU-T Standard Tool Library as 
                        described in Geneva, 20-30 January 2004 WP 3/16 Q10/16
                        TD 11 document and subsequent discussions on the
                        [e-mail] email reflector.

  ============================================================================
*/


 /*****************************************************************************
 *
 *  Enhanced 16/32 bit operators :
 *    s_max()
 *    s_min()
 *    L_max()
 *    L_min()
 *    shl_r()
 *    L_shl_r()
 *    L_mac0()
 *    L_mult0()
 *    L_msu0()
 *    s_and()
 *    s_or()
 *    s_xor()
 *    L_and()
 *    L_or()
 *    lshl()
 *    lshr()
 *    L_lshl()
 *    L_lshr()
 *    rotr()
 *    rotl()
 *    L_rotr()
 *    L_rotl()
 *
 *****************************************************************************/


/*****************************************************************************
 *
 *  Include-Files
 *
 *****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include "stl.h"

#if (WMOPS)
extern BASIC_OP multiCounter[MAXCOUNTERS];
extern int currCounter;
#endif /* ifdef WMOPS */



/*****************************************************************************
 *
 *  Local Functions
 *
 *****************************************************************************/

/*****************************************************************************
 *
 *  Function Name : saturate
 *
 *  Purpose :
 *
 *    Limits the 32 bit input to the range of a 16 bit word.
 *    This function is defined in basicop2.c.
 *
 *****************************************************************************/
#ifdef _MSC_VER
extern Word16 saturate( Word32 L_var1);
#endif /* ifdef _MSC_VER */



/*****************************************************************************
 *
 *   Constants and Globals
 *
 *****************************************************************************/


/*****************************************************************************
 *
 *   Functions
 *
 *****************************************************************************/


/*****************************************************************************
 *
 *  Function Name : lshl
 *
 *  Purpose :
 *
 *    Logically shifts left var1 by var2 positions.
 *    - If var2 is negative, var1 is shifted to the LSBits by (-var2)
 *      positions with insertion of 0 at the MSBit.
 *    - If var2 is positive, var1 is shifted to the MSBits by (var2)
 *      positions.
 *
 *  Complexity weight : 1
 *
 *  Inputs :
 *
 *    var1        16 bit short signed integer (Word16) whose value falls in 
 *                the range 0xffff 8000 <= var1 <= 0x0000 7fff.
 *
 *    var2        16 bit short signed integer (Word16) whose value falls in 
 *                the range 0xffff 8000 <= var2 <= 0x0000 7fff.
 *
 *  Outputs :
 *
 *    none
 *
 *  Return Value:
 *
 *    var_out     16 bit short signed integer (Word16) whose value falls in 
 *                the range 0xffff 8000 <= var_out <= 0x0000 7fff.
 *
 *****************************************************************************/
Word16 lshl( Word16 var1, Word16 var2) {
   Word16 var_out=0;

   if( var2 < 0) {
      var2 = -var2;
      var_out = lshr( var1, var2);

      #if (WMOPS)
      multiCounter[currCounter].lshr--;
      #endif /* ifdef WMOPS */

   } else {
      if( var2 == 0 || var1 == 0) {
         var_out = var1;
      } else if( var2 >= 16) {
         var_out = 0;
      } else {
         var_out = var1 << var2;
      }
   }
   #if (WMOPS)
   multiCounter[currCounter].lshl++;
   #endif /* ifdef WMOPS */

   return( var_out);
}

/*****************************************************************************
 *
 *  Function Name : lshr
 *
 *  Purpose :
 *
 *    Logically shifts right var1 by var2 positions.
 *    - If var2 is positive, var1 is shifted to the LSBits by (var2)
 *      positions with insertion of 0 at the MSBit.
 *    - If var2 is negative, var1 is shifted to the MSBits by (-var2)
 *      positions.
 *
 *  Complexity weight : 1
 *
 *  Inputs :
 *
 *    var1        16 bit short signed integer (Word16) whose value falls in 
 *                the range 0xffff 8000 <= var1 <= 0x0000 7fff.
 *
 *    var2        16 bit short signed integer (Word16) whose value falls in 
 *                the range 0xffff 8000 <= var2 <= 0x0000 7fff.
 *
 *  Outputs :
 *
 *    none
 *
 *  Return Value:
 *
 *    var_out     16 bit short signed integer (Word16) whose value falls in 
 *                the range 0xffff 8000 <= var_out <= 0x0000 7fff.
 *
 *****************************************************************************/
Word16 lshr( Word16 var1, Word16 var2) {
   Word16 var_out;

   if( var2 < 0) {
      var2 = -var2;
      var_out = lshl( var1, var2);

      #if (WMOPS)
      multiCounter[currCounter].lshl--;
      #endif /* ifdef WMOPS */

   } else {
      if( var2 == 0 || var1 == 0) {
         var_out = var1;
      } else if( var2 >= 16) {
         var_out = 0;
      } else {
         var_out = var1 >> 1;
         var_out = var_out & 0x7fff;
         var_out =  var_out >> ( var2-1);
      }
   }
   #if (WMOPS)
   multiCounter[currCounter].lshr++;
   #endif /* ifdef WMOPS */

   return( var_out);
}


/*****************************************************************************
 *
 *  Function Name : L_lshl
 *
 *  Purpose :
 *
 *    Logically shifts left L_var1 by var2 positions.
 *    - If var2 is negative, L_var1 is shifted to the LSBits by (-var2)
 *      positions with insertion of 0 at the MSBit.
 *    - If var2 is positive, L_var1 is shifted to the MSBits by (var2)
 *      positions.
 *
 *  Complexity weight : 1
 *
 *  Inputs :
 *
 *    L_var1      32 bit long signed integer (Word32) whose value falls in 
 *                the range 0x8000 0000 <= L_var1 <= 0x7fff ffff.
 *
 *    var2        16 bit short signed integer (Word16) whose value falls in 
 *                the range 0xffff 8000 <= var2 <= 0x0000 7fff.
 *
 *  Outputs :
 *
 *    none
 *
 *  Return Value:
 *
 *    L_var_out   32 bit long signed integer (Word32) whose value falls in 
 *                the range 0x8000 0000 <= L_var_out <= 0x7fff ffff.
 *
 *****************************************************************************/
Word32 L_lshl( Word32 L_var1, Word16 var2) {
   Word32 L_var_out=0;

   if( var2 < 0) {
      var2 = -var2;
      L_var_out = L_lshr( L_var1, var2);

      #if (WMOPS)
      multiCounter[currCounter].L_lshr--;
      #endif /* ifdef WMOPS */

   } else {
      if( var2 == 0 || L_var1 == 0) {
         L_var_out = L_var1;
      } else if( var2 >= 32) {
         L_var_out = 0;
      } else {
         L_var_out = L_var1 << var2;
      }
   }
   #if (WMOPS)
   multiCounter[currCounter].L_lshl++;
   #endif /* ifdef WMOPS */

   return( L_var_out);
}


/*****************************************************************************
 *
 *  Function Name : L_lshr
 *
 *  Purpose :
 *
 *    Logically shifts right L_var1 by var2 positions.
 *    - If var2 is positive, L_var1 is shifted to the LSBits by (var2)
 *      positions with insertion of 0 at the MSBit.
 *    - If var2 is negative, L_var1 is shifted to the MSBits by (-var2)
 *      positions.
 *
 *  Complexity weight : 1
 *
 *  Inputs :
 *
 *    L_var1      32 bit long signed integer (Word32) whose value falls in 
 *                the range 0x8000 0000 <= L_var1 <= 0x7fff ffff.
 *
 *    var2        16 bit short signed integer (Word16) whose value falls in 
 *                the range 0xffff 8000 <= var2 <= 0x0000 7fff.
 *
 *  Outputs :
 *
 *    none
 *
 *  Return Value:
 *
 *    L_var_out   32 bit long signed integer (Word32) whose value falls in 
 *                the range 0x8000 0000 <= L_var_out <= 0x7fff ffff.
 *
 *****************************************************************************/
Word32 L_lshr( Word32 L_var1, Word16 var2) {
   Word32   L_var_out;

   if( var2 < 0) {
      var2 = -var2;
      L_var_out = L_lshl( L_var1, var2);

      #if (WMOPS)
      multiCounter[currCounter].L_lshl--;
      #endif /* ifdef WMOPS */

   } else {
      if( var2 == 0 || L_var1 == 0) {
         L_var_out = L_var1;
      } else if( var2 >= 32) {
         L_var_out = 0;
      } else {
         L_var_out = L_var1 >> 1;
         L_var_out = L_var_out & 0x7fffffff;
         L_var_out =  L_var_out >> (var2 - 1);
      }
   }
   #if (WMOPS)
   multiCounter[currCounter].L_lshr++;
   #endif /* ifdef WMOPS */

   return( L_var_out);
}


/*****************************************************************************
 *