?? basic_op.c
字號:
| Return Value : |
| |
| var_out |
| 16 bit short signed integer (Word16) whose value falls in the |
| range : 0xffff 8000 <= var_out <= 0x0000 7fff. |
|___________________________________________________________________________|
*/
Word16 negate(Word16 var1)
{
Word16 var_out;
var_out = (var1 == MIN_16) ? MAX_16 : -var1;
return(var_out);
}
/*___________________________________________________________________________
| |
| Function Name : extract_h |
| |
| Purpose : |
| |
| Return the 16 MSB of L_var1. |
| |
| Complexity weight : 1 |
| |
| Inputs : |
| |
| L_var1 |
| 32 bit long signed integer (Word32 ) whose value falls in the |
| range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. |
| |
| 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 extract_h(Word32 L_var1)
{
Word16 var_out;
var_out = (Word16) (L_var1 >> 16);
return(var_out);
}
/*___________________________________________________________________________
| |
| Function Name : extract_l |
| |
| Purpose : |
| |
| Return the 16 LSB of L_var1. |
| |
| Complexity weight : 1 |
| |
| Inputs : |
| |
| L_var1 |
| 32 bit long signed integer (Word32 ) whose value falls in the |
| range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. |
| |
| 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 extract_l(Word32 L_var1)
{
Word16 var_out;
var_out = (Word16) L_var1;
return(var_out);
}
/*___________________________________________________________________________
| |
| Function Name : round |
| |
| Purpose : |
| |
| Round the lower 16 bits of the 32 bit input number into its MS 16 bits |
| with saturation. Shift the resulting bits right by 16 and return the 16 |
| bit number: |
| round(L_var1) = extract_h(L_add(L_var1,32768)) |
| |
| Complexity weight : 1 |
| |
| Inputs : |
| |
| L_var1 |
| 32 bit long signed integer (Word32 ) whose value falls in the |
| range : 0x8000 0000 <= L_var1 <= 0x7fff ffff. |
| |
| 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 round(Word32 L_var1)
{
Word16 var_out;
Word32 L_arrondi;
L_arrondi = L_add(L_var1, (Word32)0x00008000);
var_out = extract_h(L_arrondi);
return(var_out);
}
/*___________________________________________________________________________
| |
| Function Name : L_mac |
| |
| Purpose : |
| |
| Multiply var1 by var2 and shift the result left by 1. Add the 32 bit |
| result to L_var3 with saturation, return a 32 bit result: |
| L_mac(L_var3,var1,var2) = L_add(L_var3,(L_mult(var1,var2)). |
| |
| Complexity weight : 1 |
| |
| Inputs : |
| |
| L_var3 32 bit long signed integer (Word32) whose value falls in the |
| range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. |
| |
| 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 <= var1 <= 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_mac(Word32 L_var3, Word16 var1, Word16 var2)
{
Word32 L_var_out;
Word32 L_produit;
L_produit = L_mult(var1,var2);
L_var_out = L_add(L_var3,L_produit);
return(L_var_out);
}
/*___________________________________________________________________________
| |
| Function Name : L_msu |
| |
| Purpose : |
| |
| Multiply var1 by var2 and shift the result left by 1. Subtract the 32 |
| bit result to L_var3 with saturation, return a 32 bit result: |
| L_msu(L_var3,var1,var2) = L_sub(L_var3,(L_mult(var1,var2)). |
| |
| Complexity weight : 1 |
| |
| Inputs : |
| |
| L_var3 32 bit long signed integer (Word32) whose value falls in the |
| range : 0x8000 0000 <= L_var3 <= 0x7fff ffff. |
| |
| 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 <= var1 <= 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_msu(Word32 L_var3, Word16 var1, Word16 var2)
{
Word32 L_var_out;
Word32 L_produit;
L_produit = L_mult(var1,var2);
L_var_out = L_sub(L_var3,L_produit);
return(L_var_out);
}
/*___________________________________________________________________________
| |
| Function Name : L_macNs |
| |
| Purpose : |
| |
| Multiply var1 by var2 and shift the result left by 1. Add the 32 bit |
| result to L_var3 without saturation, return a 32 bit result. Generate |
| carry and overflow values : |
| L_macNs(L_var3,var1,var2) = L_add_c(L_var3,(L_mult(var1,var2)). |
| |
| Complexity weight : 1 |
| |
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