sc_int
sc_int is signed integer, and it is fixed precision integer of size 64 bits. The underlying operations use 64 bits, but the result size is determined at object declaration.
In sc_int the values is stored in 2's compliment. Since it is signed integer, the sign bit for a N bit wide sc_int is stored at N-1 bit position.
Integer types have a very rich set of operators that work with them.
Basic Operators
| Operator | Description | Usage |
| & | Bitwise AND | expr1 & expr2 |
| 1 | Bitwise OR | expr1 | expr2 |
| ^ | Bitwise XOR | expr1 ^ expr2 |
| ~ | Bitwise NOT | ~expr |
| + | Addition | expr1 + expr2 |
| - | Minus | expr1 - expr2 |
| * | Multiply | expr1 * expr2 |
| / | Divide | expr1 / expr2 |
| % | Modulus | expr1 % expr2 |
| >> | Arithmetic right shift | expr >> constant |
| << | Arithmetic left shift | expr << constant |
Compound Assignment
| Operator | Description | Usage |
| += | + assignment | variable += expr |
| -= | - assignment | variable -= expr |
| *= | * assignment | variable *= expr |
| \= | \ assignment | variable \= expr |
| %= | % assignment | variable %= expr |
| &= | AND assignment | variable &= expr |
| |= | OR assignment | variable |= expr |
| ^= | XOR assignment | variable ^= expr |
Logic Operators
| Operator | Description | Usage |
| = | Equality | expr1 = expr2 |
| != | Inequality | expr1 != expr2 |
| < | Less than | expr1 < expr2 |
| <= | Less than or equal to | expr1 <= expr2 |
| > | Greater than | expr1 > expr2 |
| >= | Greater than or equal to | expr1 >= expr2 |
| ++ | AutoIncrement | variable ++ |
| -- | AutoDecrement | variable -- |
Bit Operators
|
| ||||||||||||
| Bitwise operators work on operands |
Type sc_int can be used with C++ integer types without restriction.
Example sc_int
1 #include
2
3 int sc_main (int argc, char* argv[]) {
4 sc_int<1> bit_size = 0;
5 sc_int<4> nibble_size = 1;
6 sc_int<8> byte_size = 2;
7 sc_int<32> dword_size = 3;
8 //sc_int addr; sc_int can not be more then 64
9 // Perform auto increment
10 dword_size ++;
11 cout <<"Value of dword_size : " << dword_size << endl;
12 // Terse method addition
13 byte_size += nibble_size;
14 cout <<"Value of byte_size : " << byte_size << endl;
15 // Bit selection
16 bit_size = dword_size[2];
17 cout <<"Value of bit_size : " << bit_size << endl;
18 // Range selection
19 nibble_size = dword_size.range(4,1); // Can not assign out of range
20 cout <<"Value of nibble_size: " << nibble_size << endl;
21 // Concatenated
22 dword_size = (byte_size,byte_size,byte_size,byte_size);
23 cout <<"Value of dword_size : " << dword_size << endl;
24
25 return 1;
26 }
Simulator Output: sc_int
SystemC 2.0.1 --- Oct 6 2006 19:17:37
Copyright (c) 1996-2002 by all Contributors
ALL RIGHTS RESERVED
Value of dword_size : 4
Value of byte_size : 3
Value of bit_size : -1
Value of nibble_size: 2
Value of dword_size : 50529027
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