xref: /gem5/src/systemc/dt/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 (std::floor(v) && (i < nd)) {
#ifndef _WIN32
        d[i++] = (sc_digit) std::floor(remainder(v, DIGIT_RADIX));
#else
        d[i++] = (sc_digit) std::floor(std::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();
}