src/systemc/tests/systemc/datatypes/int/arith/arith01/arith01.cpp

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

  arith01.cpp -- 

  Original Author: Martin Janssen, Synopsys, Inc., 2002-02-15

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

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

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
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#include <stdio.h>
#include <stdlib.h>
#include "systemc.h"

/*

 int9 x;

 x.q = -256;

 x.q is equal to 256 in Sun's CC, and -256 in gcc. The standard leaves
 this issue as implementation dependent unless the definition is
 qualified explicitly by signed or unsigned.  

 In order to force consistent behavior, I've qualified every int
 definition accordingly in all the arith files.  

*/

typedef struct int9 {
    signed int q : 9;
} int9;

typedef struct int31 {
    signed int q : 31;
} int31;

void
crunch(sc_signed& z, int31 v31, int u, int v)
{
    for (int i = 0; i < 100000; ++i) {
        z *= u;
        z += v;
        v31.q *= u;
        v31.q += v;
        sc_assert(z == v31.q);
    }
}

// Function to fix result in int9 struct to correctly under-/overflow
// within its 9 bits range and still ensure the correct sign encoding
// over the full size of the integer variable. Otherwise, compiler
// optimization may lead to spurious assertion errors.
void
fix_int9(int9& v) {
  v.q %= 0x200;
}

int
sc_main( int argc, char* argv[] )
{
    sc_signed x(31);
    sc_signed y(9);
    sc_signed z(31);
    int9 v;

    y = -256;
    v.q = -256;
    sc_assert(y == v.q);
    cout << y << '\t' << v.q << endl;
    for (int i = 0; i < 1000; ++i) {
        y++;
        v.q++;
        fix_int9(v);
        cout << y << '\t' << v.q << endl;
        sc_assert(y == v.q);
    }
    for (int i = 0; i < 1000; ++i) {
        y--;
        v.q--;
        fix_int9(v);
        cout << y << '\t' << v.q << endl;
        sc_assert(y == v.q);
    }
    for (int i = 0; i < 1000; ++i) {
        ++y;
        ++v.q;
        fix_int9(v);
        cout << y << '\t' << v.q << endl;
        sc_assert(y == v.q);
    }
    for (int i = 0; i < 1000; ++i) {
        --y;
        --v.q;
        fix_int9(v);
        cout << y << '\t' << v.q << endl;
        sc_assert(y == v.q);
    }

    z = 129023;
    int31 v31;
    v31.q = 129023;
    crunch(z, v31, 491, 12089);

    x = -129023;
    v31.q = -129023;
    crunch(x, v31, 109, -426);

    x = -1;
    v31.q = -1;
    crunch(x, v31, 30941, -1188);
    
    return 0;
}