xref: /gem5/ext/systemc/src/sysc/datatypes/int/sc_signed_subref.inc

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  more contributor license agreements.  See the NOTICE file distributed
  with this work for additional information regarding copyright ownership.
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    http://www.apache.org/licenses/LICENSE-2.0

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  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
  implied.  See the License for the specific language governing
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/*****************************************************************************

  sc_signed_subref.h -- Proxy class that is declared in sc_signed.h.

  Original Author: Ali Dasdan, Synopsys, Inc.

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

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

  MODIFICATION LOG - modifiers, enter your name, affiliation, date and
  changes you are making here.

      Name, Affiliation, Date:
  Description of Modification:

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


// ----------------------------------------------------------------------------
//  CLASS : sc_signed_subref_r
//
//  Proxy class for sc_signed part selection (r-value only).
// ----------------------------------------------------------------------------

// concatenation support

uint64 sc_signed_subref_r::concat_get_uint64() const
{
    sc_unsigned a( m_obj_p, m_left, m_right );
    return a.to_uint64();
}


bool sc_signed_subref_r::concat_get_ctrl(sc_digit* dst_p, int low_i ) const
{
    sc_unsigned a( m_obj_p, m_left, m_right );
    return a.concat_get_ctrl( dst_p, low_i );
}


bool sc_signed_subref_r::concat_get_data(sc_digit* dst_p, int low_i ) const
{
    sc_unsigned a( m_obj_p, m_left, m_right );
    return a.concat_get_data( dst_p, low_i );
}


// implicit conversion to sc_signed

sc_signed_subref_r::operator sc_unsigned () const
{
    return sc_unsigned( m_obj_p, m_left, m_right );
}


// explicit conversions

int
sc_signed_subref_r::to_int() const
{
    sc_unsigned a( m_obj_p, m_left, m_right );
    return a.to_int();
}

unsigned int
sc_signed_subref_r::to_uint() const
{
    sc_unsigned a( m_obj_p, m_left, m_right );
    return a.to_uint();
}

long
sc_signed_subref_r::to_long() const
{
    sc_unsigned a( m_obj_p, m_left, m_right );
    return a.to_long();
}

unsigned long
sc_signed_subref_r::to_ulong() const
{
    sc_unsigned a( m_obj_p, m_left, m_right );
    return a.to_ulong();
}

int64
sc_signed_subref_r::to_int64() const
{
    sc_unsigned a( m_obj_p, m_left, m_right );
    return a.to_int64();
}

uint64
sc_signed_subref_r::to_uint64() const
{
    sc_unsigned a( m_obj_p, m_left, m_right );
    return a.to_uint64();
}

double
sc_signed_subref_r::to_double() const
{
    sc_unsigned a( m_obj_p, m_left, m_right );
    return a.to_double();
}


// explicit conversion to character string

const std::string
sc_signed_subref_r::to_string( sc_numrep numrep ) const
{
    sc_unsigned a( length() );
    a = *this;
    return a.to_string( numrep );
}

const std::string
sc_signed_subref_r::to_string( sc_numrep numrep, bool w_prefix ) const
{
    sc_unsigned a( length() );
    a = *this;
    return a.to_string( numrep, w_prefix );
}


// ----------------------------------------------------------------------------
//  CLASS : sc_signed_subref
//
//  Proxy class for sc_signed part selection (r-value and l-value).
// ----------------------------------------------------------------------------

// assignment operators

const sc_signed_subref&
sc_signed_subref::operator = ( const sc_signed_subref_r& a )
{
    return operator = ( (sc_unsigned)( a ) );
}

const sc_signed_subref&
sc_signed_subref::operator = ( const sc_signed_subref& v )
{
    if( this == &v ) {
	return *this;
    }
    return operator = ( (sc_unsigned)( v ) );
}

const sc_signed_subref&
sc_signed_subref::operator = ( const sc_signed& v )
{
    int i;
    int l = sc_min( m_left, v.nbits - 1 + m_right );

    for( i = m_right; i <= l; ++ i ) m_obj_p->set( i, v.test( i - m_right ) );
    for ( ; i <= m_left; i++ ) m_obj_p->set( i, v.test( l ) );

    return *this;
}

const sc_signed_subref&
sc_signed_subref::operator = ( const sc_unsigned_subref_r& v )
{
    return operator = ( (sc_unsigned)( v ) );
}

const sc_signed_subref&
sc_signed_subref::operator = ( const sc_unsigned& v )
{
    int i;
    int l = sc_min( m_left, v.nbits - 1 + m_right );

    for( i = m_right; i <= l; ++ i ) m_obj_p->set( i, v.test( i - m_right ) );
    for ( ; i <= m_left; i++ ) m_obj_p->set( i, 0 );
    return *this;
}

const sc_signed_subref&
sc_signed_subref::operator = ( unsigned long v )
{
    for( int i = m_right; i <= m_left; ++ i ) {
	m_obj_p->set( i, static_cast<bool>( v & 1 ) );
	v >>= 1;
    }
    return *this;
}

const sc_signed_subref&
sc_signed_subref::operator = ( long v )
{
    unsigned long v2 = (unsigned long) v;
    for( int i = m_right; i <= m_left; ++ i ) {
	m_obj_p->set( i, static_cast<bool>( v2 & 1 ) );
	v2 >>= 1;
    }
    return *this;
}

const sc_signed_subref&
sc_signed_subref::operator = ( uint64 v )
{
    for( int i = m_right; i <= m_left; ++ i ) {
	m_obj_p->set( i, static_cast<bool>( v & 1 ) );
	v >>= 1;
    }
    return *this;
}

const sc_signed_subref&
sc_signed_subref::operator = ( int64 v )
{
    uint64 v2 = (uint64) v;
    for( int i = m_right; i <= m_left; ++ i ) {
	m_obj_p->set( i, static_cast<bool>( v2 & 1 ) );
	v2 >>= 1;
    }
    return *this;
}

const sc_signed_subref&
sc_signed_subref::operator = ( double v )
{
    is_bad_double(v);

    int nb = m_left - m_right + 1;
    int nd = DIV_CEIL(nb);

#ifdef SC_MAX_NBITS
    sc_digit d[MAX_NDIGITS];
#else
    sc_digit *d = new sc_digit[nd];
#endif

    if (v < 0)
	v = -v;

    int i = 0;

    while (floor(v) && (i < nd)) {
#ifndef _WIN32
	d[i++] = (sc_digit) floor(remainder(v, DIGIT_RADIX));
#else
	d[i++] = (sc_digit) floor(fmod(v, DIGIT_RADIX));
#endif
	v /= DIGIT_RADIX;
    }

    vec_zero(i, nd, d);

    sc_digit val = 1;  // Bit value.
    int j = 0;   // Current digit in d.

    i = 0;  // Current bit in d.

    while (i < nb) {

	m_obj_p->set(i + m_right, (bool) (d[j] & val));

	++i;

	if (i % BITS_PER_DIGIT == 0) {
	    val = 1;
	    ++j;
	}
	else
	    val <<= 1;
    }

#ifndef SC_MAX_NBITS
    delete [] d;
#endif

    return *this;
}

const sc_signed_subref&
sc_signed_subref::operator = ( const sc_int_base& a )
{
    return operator = ( (int64) a );
}

const sc_signed_subref&
sc_signed_subref::operator = ( const sc_uint_base& a )
{
    return operator = ( (uint64) a );
}

// concatenation methods


void sc_signed_subref::concat_set( int64 src, int low_i )
{
    int  i;
    int  l;
    bool sign = src < 0;

    if ( low_i < 64 )
    {
	src = src >> low_i;
	l = sc_min( m_left, (63-low_i) + m_right );
	for( i = m_right; i <= l; ++ i ) {
		m_obj_p->set( i, src & 1 );
		src = src >> 1;
	}
	for ( ; i <= m_left; i++ ) m_obj_p->set(i, sign);
    }
    else
    {
	for( i = m_right; i <= m_left; ++ i ) m_obj_p->set(i, sign);
    }
}

void sc_signed_subref::concat_set( const sc_signed& src, int low_i )
{
    int i;
    int l;
    int src_i;
    bool sign = src.test(src.nbits-1);
    l = src.nbits - (low_i+1);
    if ( l >= 0 )
    {
	l = sc_min( m_left, l + m_right );
	src_i = low_i;
	for( i = m_right; i <= l; ++ i, src_i++ ) {
	    m_obj_p->set( i, src.test( src_i ) );
	}
	for ( ; i <= m_left; i++ ) m_obj_p->set(i, sign);
    }
    else
    {
	for( i = m_right; i <= m_left; ++ i ) m_obj_p->set(i, sign);
    }
}

void sc_signed_subref::concat_set( const sc_unsigned& src, int low_i )
{
    int i;
    int l;
    int src_i;
    l = src.nbits - (low_i+2);
    if ( l >= 0 )
    {
	l = sc_min( m_left, l + m_right );
	src_i = low_i;
	for( i = m_right; i <= l; ++ i, src_i++ ) {
	    m_obj_p->set( i, src.test( src_i ) );
	}
	for ( ; i <= m_left; i++ ) m_obj_p->set(false);
    }
    else
    {
	for( i = m_right; i <= m_left; ++ i ) m_obj_p->set(false);
    }
}

void sc_signed_subref::concat_set( uint64 src, int low_i )
{
    int  i;
    int  l;

    if ( low_i < 64 )
    {
	src = src >> low_i;
	l = sc_min( m_left, (63-low_i) + m_right );
	for( i = m_right; i <= l; ++ i ) {
		m_obj_p->set( i, src & 1 );
		src = src >> 1;
	}
	for ( ; i <= m_left; i++ ) m_obj_p->set(false);
    }
    else
    {
	for( i = m_right; i <= m_left; ++ i ) m_obj_p->set(false);
    }
}
// other methods

void
sc_signed_subref::scan( ::std::istream& is )
{
    std::string s;
    is >> s;
    *this = s.c_str();
}


// End of file