xref: /gem5/src/systemc/tests/systemc/datatypes/fx/constructors/array.cpp

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

  array.cpp --

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

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

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

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
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// array.cxx --
// Copyright Synopsys 1998
// Author          : Ric Hilderink
// Created On      : Wed Dec 30 11:55:50 1998
// Status          : none
//

#include <limits.h>
#define SC_INCLUDE_FX
#include "systemc.h"

// Without this, conversions use the implicit
// operator double, which is both lossy and
// can cause UB in certain cases.
template <typename From>
class converter {
  From val;
public:
  converter(From val): val(val) {}
  operator int() const            { return val.to_int();    }
  operator unsigned int() const   { return val.to_uint();   }
  operator short() const          { return val.to_short();  }
  operator unsigned short() const { return val.to_ushort(); }
  operator long() const           { return val.to_long();   }
  operator unsigned long() const  { return val.to_ulong();  }
  operator float() const          { return val.to_float();  }
  operator double() const         { return val.to_double(); }
};

template <typename To, typename From>
To convert(From val) {
  return converter<From>(val);
}


template <typename T>
void show(char const *const name, int i, T val) {
  cerr << name << "[" << i << "] : " << val.to_double() << " : " << val.to_string(SC_HEX) << "\n";
}

template <typename T, typename U>
void test_fx(U a_mul, U b_init, U b_mul, char const *t_name, char const *u_name)
{
  cerr << "--array-Inf-Inf-Inf-Inf-Inf- test_fx_" << t_name << "_" << u_name << "\n";

  T a(static_cast<U>(0));
  T b(b_init);
  show("a", 0, a);
  show("b", 0, b);

  for (U i = 1; i < 4; ++i) {
    // Be careful here. We don't want a T to ever be implicitly converted,
    // else we have a double which cannot be safely cast, but converting early
    // means we can be subject to implicit upcasts. That's minimized by having all
    // of the values of type U, but if U is smaller than int it can still be
    // implicitly upcast, ergo the outer cast.
    a = static_cast<U>(i * i * a_mul);
    b = static_cast<U>(convert<U>(b) * i * b_mul);
    show("a", i, a);
    show("b", i, b);
  }
}

template <typename T>
void batch_test_fx(char const *t_name, int uinit) {
  cerr << "************** array test_fx_" << t_name << "_\n";
  test_fx<T, int           >(1,     -1, -1, t_name, "int");
  test_fx<T, unsigned int  >(1,  uinit, -1, t_name, "uint");
  test_fx<T, short         >(1,     -1, -1, t_name, "short");
  test_fx<T, unsigned short>(1,  uinit, -1, t_name, "ushort");
  test_fx<T, long          >(1,     -1, -1, t_name, "long");
  test_fx<T, unsigned long >(1,  uinit, -1, t_name, "ulong");
  test_fx<T, float >(1.123456789f, -1.987654321f, -1.789654123f, t_name, "float");
  test_fx<T, double>(1.123456789,  -1.987654321,  -1.789654123,  t_name, "double");
}

void array() {
  batch_test_fx<sc_fxval>("float", -1);
  batch_test_fx<sc_ufix>("ufix", -1);
  batch_test_fx<sc_fix>("fix", -1);
  batch_test_fx<sc_fixed<8, 5> >("fixed", 1);
  batch_test_fx<sc_ufixed<8, 5> >("ufixed", 1);
}