xref: /gem5/src/systemc/dt/int/sc_int_base.cc

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  Licensed to Accellera Systems Initiative Inc. (Accellera) under one or
  more contributor license agreements.  See the NOTICE file distributed
  with this work for additional information regarding copyright ownership.
  Accellera licenses this file to you under the Apache License, Version 2.0
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    http://www.apache.org/licenses/LICENSE-2.0

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  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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 *****************************************************************************/

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

  sc_int_base.cpp -- contains interface definitions between sc_int and
                sc_signed, sc_unsigned, and definitions for sc_int_subref.

  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:

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


// $Log: sc_int_base.cpp,v $
// Revision 1.5  2011/02/18 20:19:14  acg
//  Andy Goodrich: updating Copyright notice.
//
// Revision 1.4  2010/02/04 22:23:29  acg
//  Andy Goodrich: fixed bug in concatenation reads for part selections,
//  the mask being used was 32 bits and should have been 64 bits.
//
// Revision 1.3  2008/06/19 17:47:56  acg
//  Andy Goodrich: fixes for bugs. See 2.2.1 RELEASENOTES.
//
// Revision 1.2  2007/11/04 21:27:00  acg
//  Andy Goodrich: changes to make sure the proper value is returned from
//  concat_get_data().
//
// Revision 1.1.1.1  2006/12/15 20:20:05  acg
// SystemC 2.3
//
// Revision 1.3  2006/01/13 18:49:31  acg
// Added $Log command so that CVS check in comments are reproduced in the
// source.
//

#include <sstream>

#include "systemc/ext/dt/bit/sc_bv_base.hh"
#include "systemc/ext/dt/bit/sc_lv_base.hh"
#include "systemc/ext/dt/fx/sc_fix.hh"
#include "systemc/ext/dt/fx/scfx_other_defs.hh"
#include "systemc/ext/dt/int/sc_int_base.hh"
#include "systemc/ext/dt/int/sc_signed.hh"
#include "systemc/ext/dt/int/sc_uint_base.hh"
#include "systemc/ext/dt/int/sc_unsigned.hh"
#include "systemc/ext/dt/misc/sc_concatref.hh"

// explicit template instantiations
namespace sc_core
{

template class sc_vpool<sc_dt::sc_int_bitref>;
template class sc_vpool<sc_dt::sc_int_subref>;

} // namespace sc_core

namespace sc_dt
{

// to avoid code bloat in sc_int_concref<T1,T2>

void
sc_int_concref_invalid_length(int length)
{
    std::stringstream msg;
    msg << "sc_int_concref<T1,T2> initialization: length = " << length <<
           "violates 1 <= length <= " << SC_INTWIDTH;
    SC_REPORT_ERROR("out of bounds", msg.str().c_str());
    sc_core::sc_abort(); // can't recover from here
}


// ----------------------------------------------------------------------------
//  CLASS : sc_int_bitref
//
//  Proxy class for sc_int bit selection (r-value and l-value).
// ----------------------------------------------------------------------------

sc_core::sc_vpool<sc_int_bitref> sc_int_bitref::m_pool(9);

// concatenation methods:

// #### OPTIMIZE
void sc_int_bitref::concat_set(int64 src, int low_i)
{
    sc_int_base aa(1);
    *this = aa = (low_i < 64) ? src >> low_i : src >> 63;
}

void sc_int_bitref::concat_set(const sc_signed &src, int low_i)
{
    sc_int_base aa(1);
    if (low_i < src.length())
        *this = aa = 1 & (src >> low_i);
    else
        *this = aa = (src < 0) ? (int_type)-1 : 0;
}

void sc_int_bitref::concat_set(const sc_unsigned &src, int low_i)
{
    sc_int_base aa(1);
    if (low_i < src.length())
        *this = aa = 1 & (src >> low_i);
    else
        *this = aa = 0;
}

void sc_int_bitref::concat_set(uint64 src, int low_i)
{
    sc_int_base aa(1);
    *this = aa = (low_i < 64) ? src >> low_i : 0;
}


// other methods
void
sc_int_bitref::scan(::std::istream &is)
{
    bool b;
    is >> b;
    *this = b;
}


// ----------------------------------------------------------------------------
//  CLASS : sc_int_subref_r
//
//  Proxy class for sc_int part selection (l-value).
// ----------------------------------------------------------------------------

bool
sc_int_subref_r::concat_get_ctrl(sc_digit *dst_p, int low_i) const
{
    int dst_i; // Word in dst_p now processing.
    int end_i; // Highest order word in dst_p to process.
    int high_i; // Index of high order bit in dst_p to set.
    uint_type mask; // Mask for bits to extract or keep.

    dst_i = low_i / BITS_PER_DIGIT;
    high_i = low_i + (m_left - m_right);
    end_i = high_i / BITS_PER_DIGIT;
    mask = ~mask_int[m_left][m_right];

    // PROCESS THE FIRST WORD:
    dst_p[dst_i] = (sc_digit)(dst_p[dst_i] & mask);
    switch (end_i - dst_i) {
      // BITS ARE ACROSS TWO WORDS:
      case 1:
        dst_i++;
        dst_p[dst_i] = 0;
        break;

      // BITS ARE ACROSS THREE WORDS:
      case 2:
        dst_i++;
        dst_p[dst_i++] = 0;
        dst_p[dst_i] = 0;
        break;

      // BITS ARE ACROSS FOUR WORDS:
      case 3:
        dst_i++;
        dst_p[dst_i++] = 0;
        dst_p[dst_i++] = 0;
        dst_p[dst_i] = 0;
        break;
    }
    return false;
}

bool
sc_int_subref_r::concat_get_data(sc_digit *dst_p, int low_i) const
{
    int dst_i; // Word in dst_p now processing.
    int end_i; // Highest order word in dst_p to process.
    int high_i; // Index of high order bit in dst_p to set.
    int left_shift; // Left shift for val.
    uint_type mask; // Mask for bits to extract or keep.
    bool non_zero; // True if value inserted is non-zero.
    uint_type val; // Selection value extracted from m_obj_p.

    dst_i = low_i / BITS_PER_DIGIT;
    left_shift = low_i % BITS_PER_DIGIT;
    high_i = low_i + (m_left-m_right);
    end_i = high_i / BITS_PER_DIGIT;
    mask = ~mask_int[m_left][m_right];
    val = (m_obj_p->m_val & mask) >> m_right;
    non_zero = val != 0;

    // PROCESS THE FIRST WORD:
    mask = ~(~UINT_ZERO << left_shift);
    dst_p[dst_i] = (sc_digit)((dst_p[dst_i] & mask) |
                ((val << left_shift) & DIGIT_MASK));

    switch (end_i - dst_i) {
      // BITS ARE ACROSS TWO WORDS:
      case 1:
        dst_i++;
        val >>= (BITS_PER_DIGIT - left_shift);
        dst_p[dst_i] = (sc_digit)(val & DIGIT_MASK);
        break;

      // BITS ARE ACROSS THREE WORDS:
      case 2:
        dst_i++;
        val >>= (BITS_PER_DIGIT - left_shift);
        dst_p[dst_i++] = (sc_digit)(val & DIGIT_MASK);
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i] = (sc_digit)val;
        break;

      // BITS ARE ACROSS FOUR WORDS:
      case 3:
        dst_i++;
        val >>= (BITS_PER_DIGIT - left_shift);
        dst_p[dst_i++] = (sc_digit)(val & DIGIT_MASK);
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i++] = (sc_digit)(val & DIGIT_MASK);
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i] = (sc_digit)val;
        break;
    }
    return non_zero;
}

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

sc_core::sc_vpool<sc_int_subref> sc_int_subref::m_pool(9);

// assignment operators

sc_int_subref &
sc_int_subref::operator = (int_type v)
{
    int_type val = m_obj_p->m_val;
    uint_type mask = mask_int[m_left][m_right];
    val &= mask;
    val |= (v << m_right) & ~mask;
    m_obj_p->m_val = val;
    m_obj_p->extend_sign();
    return *this;
}

sc_int_subref &
sc_int_subref::operator = (const sc_signed &a)
{
    sc_int_base aa(length());
    return (*this = aa = a);
}

sc_int_subref &
sc_int_subref::operator = (const sc_unsigned &a)
{
    sc_int_base aa(length());
    return (*this = aa = a);
}

sc_int_subref &
sc_int_subref::operator = (const sc_bv_base &a)
{
    sc_int_base aa(length());
    return (*this = aa = a);
}

sc_int_subref &
sc_int_subref::operator = (const sc_lv_base &a)
{
    sc_int_base aa(length());
    return (*this = aa = a);
}


// concatenation methods:
// #### OPTIMIZE
void
sc_int_subref::concat_set(int64 src, int low_i)
{
    sc_int_base aa(length());
    *this = aa = (low_i < 64) ? src >> low_i : src >> 63;
}

void
sc_int_subref::concat_set(const sc_signed &src, int low_i)
{
    sc_int_base aa(length());
    if (low_i < src.length())
        *this = aa = src >> low_i;
    else
        *this = (src < 0) ? (int_type)-1 : 0;
}

void
sc_int_subref::concat_set(const sc_unsigned &src, int low_i)
{
    sc_int_base aa(length());
    if (low_i < src.length())
        *this = aa = src >> low_i;
    else
        *this = 0;
}

void
sc_int_subref::concat_set(uint64 src, int low_i)
{
    sc_int_base aa (length());
    *this = aa = (low_i < 64) ? src >> low_i : 0;
}


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


// ----------------------------------------------------------------------------
//  CLASS : sc_int_base
//
//  Base class for sc_int.
// ----------------------------------------------------------------------------

// support methods
void
sc_int_base::invalid_length() const
{
    std::stringstream msg;
    msg << "sc_int[_base] initialization: length = " << m_len <<
           " violates 1 <= length <= " << SC_INTWIDTH;
    SC_REPORT_ERROR("out of bounds", msg.str().c_str());
    sc_core::sc_abort(); // can't recover from here
}

void
sc_int_base::invalid_index(int i) const
{
    std::stringstream msg;
    msg << "sc_int[_base] bit selection: index = " << i <<
           " violates 0 <= index <= " << (m_len - 1);
    SC_REPORT_ERROR("out of bounds", msg.str().c_str());
    sc_core::sc_abort(); // can't recover from here
}

void
sc_int_base::invalid_range(int l, int r) const
{
    std::stringstream msg;
    msg << "sc_int[_base] part selection: " <<
           "left = " << l << ", right = " << r << " violates " <<
           (m_len-1) << " >= left >= right >= 0";
    SC_REPORT_ERROR("out of bounds", msg.str().c_str());
    sc_core::sc_abort(); // can't recover from here
}

void
sc_int_base::check_value() const
{
    int_type limit = (int_type)1 << (m_len - 1);
    if (m_val < -limit || m_val >= limit) {
        std::stringstream msg;
        msg << "sc_int[_base]: value does not fit into a length of " << m_len;
        SC_REPORT_WARNING("out of bounds", msg.str().c_str());
    }
}


// constructors
sc_int_base::sc_int_base(const sc_bv_base &v) :
    m_val(0), m_len(v.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = v;
}
sc_int_base::sc_int_base(const sc_lv_base &v) :
    m_val(0), m_len(v.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = v;
}
sc_int_base::sc_int_base(const sc_uint_subref_r &v) :
    m_val(0), m_len(v.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = v.to_uint64();
}
sc_int_base::sc_int_base(const sc_signed_subref_r &v) :
    m_val(0), m_len(v.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = v.to_uint64();
}
sc_int_base::sc_int_base(const sc_unsigned_subref_r &v) :
    m_val(0), m_len(v.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = v.to_uint64();
}

sc_int_base::sc_int_base(const sc_signed &a) :
    m_val(0), m_len(a.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = a.to_int64();
}

sc_int_base::sc_int_base(const sc_unsigned &a) :
    m_val(0), m_len(a.length()), m_ulen(SC_INTWIDTH - m_len)
{
    check_length();
    *this = a.to_int64();
}


// assignment operators
sc_int_base &
sc_int_base::operator = (const sc_signed &a)
{
    int minlen = sc_min(m_len, a.length());
    int i = 0;
    for (; i < minlen; ++i) {
        set(i, a.test(i));
    }
    bool sgn = a.sign();
    for (; i < m_len; ++i) {
        // sign extension
        set(i, sgn);
    }
    extend_sign();
    return *this;
}

sc_int_base &
sc_int_base::operator = (const sc_unsigned &a)
{
    int minlen = sc_min(m_len, a.length());
    int i = 0;
    for (; i < minlen; ++i) {
        set(i, a.test(i));
    }
    for (; i < m_len; ++i) {
        // zero extension
        set(i, 0);
    }
    extend_sign();
    return *this;
}


sc_int_base &
sc_int_base::operator = (const sc_bv_base &a)
{
    int minlen = sc_min(m_len, a.length());
    int i = 0;
    for (; i < minlen; ++i) {
        set(i, a.get_bit(i));
    }
    for (; i < m_len; ++i) {
        // zero extension
        set(i, 0);
    }
    extend_sign();
    return *this;
}

sc_int_base &
sc_int_base::operator = (const sc_lv_base &a)
{
    int minlen = sc_min(m_len, a.length());
    int i = 0;
    for (; i < minlen; ++i) {
        set(i, sc_logic(a.get_bit(i)).to_bool());
    }
    for (; i < m_len; ++i) {
        // zero extension
        set(i, 0);
    }
    extend_sign();
    return *this;
}

sc_int_base &
sc_int_base::operator = (const char *a)
{
    if (a == 0) {
        SC_REPORT_ERROR("conversion failed",
                        "character string is zero");
    } else if (*a == 0) {
        SC_REPORT_ERROR("conversion failed",
                        "character string is empty");
    } else try {
        int len = m_len;
        sc_fix aa(a, len, len, SC_TRN, SC_WRAP, 0, SC_ON);
        return this->operator = (aa);
    } catch(const sc_core::sc_report &) {
        std::stringstream msg;
        msg << "character string '" << a << "' is not valid";
        SC_REPORT_ERROR("conversion failed", msg.str().c_str());
    }
    return *this;
}

// explicit conversion to character string
const std::string
sc_int_base::to_string(sc_numrep numrep) const
{
    int len = m_len;
    sc_fix aa(*this, len, len, SC_TRN, SC_WRAP, 0, SC_ON);
    return aa.to_string(numrep);
}

const std::string
sc_int_base::to_string(sc_numrep numrep, bool w_prefix) const
{
    int len = m_len;
    sc_fix aa(*this, len, len, SC_TRN, SC_WRAP, 0, SC_ON);
    return aa.to_string(numrep, w_prefix);
}


// reduce methods
bool sc_int_base::and_reduce() const { return (m_val == int_type(-1)); }
bool sc_int_base::or_reduce() const { return (m_val != int_type(0)); }

bool
sc_int_base::xor_reduce() const
{
    uint_type mask = ~UINT_ZERO;
    uint_type val = m_val & (mask >> m_ulen);
    int n = SC_INTWIDTH;
    do {
        n >>= 1;
        mask >>= n;
        val = ((val & (mask << n)) >> n) ^ (val & mask);
    } while (n != 1);
    return (val != uint_type(0));
}

bool
sc_int_base::concat_get_ctrl(sc_digit *dst_p, int low_i) const
{
    int dst_i; // Word in dst_p now processing.
    int end_i; // Highest order word in dst_p to process.
    int left_shift; // Left shift for val.
    uint_type mask; // Mask for bits to extract or keep.

    dst_i = low_i / BITS_PER_DIGIT;
    left_shift = low_i % BITS_PER_DIGIT;
    end_i = (low_i + (m_len - 1)) / BITS_PER_DIGIT;

    mask = ~(~UINT_ZERO << left_shift);
    dst_p[dst_i] = (sc_digit)(dst_p[dst_i] & mask);
        dst_i++;
        for (; dst_i <= end_i; dst_i++)
            dst_p[dst_i] = 0;
        return false;
}

//-----------------------------------------------------------------------------
//"sc_int_base::concat_get_data"
//
// This method transfers the value of this object instance to the supplied
// array of sc_unsigned digits starting with the bit specified by low_i within
// the array of digits.
//
// Notes:
//   (1) we don't worry about masking the high order data we transfer since
//       concat_get_data() is called from low order bit to high order bit. So
//       the bits above where we place ours will be filled in by someone else.
//
//   dst_p -> array of sc_unsigned digits to be filled in.
//   low_i =  first bit within dst_p to be set.
//-----------------------------------------------------------------------------
bool
sc_int_base::concat_get_data(sc_digit *dst_p, int low_i) const
{
    int dst_i; // Word in dst_p now processing.
    int end_i; // Highest order word in dst_p to process.
    int high_i; // Index of high order bit in dst_p to set.
    int left_shift; // Left shift for val.
    uint_type mask; // Mask for bits to extract or keep.
    bool non_zero; // True if value inserted is non-zero.
    uint_type val; // Value for this object.

    dst_i = low_i / BITS_PER_DIGIT;
    left_shift = low_i % BITS_PER_DIGIT;
    high_i = low_i + (m_len - 1);
    end_i = high_i / BITS_PER_DIGIT;
    val = m_val;
    non_zero = val != 0;

    // MASK OFF DATA TO BE TRANSFERRED BASED ON WIDTH:
    if (m_len < 64) {
        mask = ~(~UINT_ZERO << m_len);
        val &=  mask;
    }

    // PROCESS THE FIRST WORD:
    mask = (~UINT_ZERO << left_shift);
    dst_p[dst_i] = (sc_digit)((dst_p[dst_i] & ~mask) |
            ((val <<left_shift) & DIGIT_MASK));
    switch (end_i - dst_i) {
      // BITS ARE ACROSS TWO WORDS:
      case 1:
        dst_i++;
        val >>= (BITS_PER_DIGIT - left_shift);
        dst_p[dst_i] = (sc_digit)val;
        break;

      // BITS ARE ACROSS THREE WORDS:
      case 2:
        dst_i++;
        val >>= (BITS_PER_DIGIT - left_shift);
        dst_p[dst_i++] = ((sc_digit)val) & DIGIT_MASK;
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i] = (sc_digit)val;
        break;

      // BITS ARE ACROSS FOUR WORDS:
      case 3:
        dst_i++;
        val >>= (BITS_PER_DIGIT - left_shift);
        dst_p[dst_i++] = (sc_digit)(val & DIGIT_MASK);
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i++] = (sc_digit)(val & DIGIT_MASK);
        val >>= BITS_PER_DIGIT;
        dst_p[dst_i] = (sc_digit)val;
        break;
    }
    return non_zero;
}

// #### OPTIMIZE
void
sc_int_base::concat_set(int64 src, int low_i)
{
    *this = (low_i < 64) ? src >> low_i : src >> 63;
}

void
sc_int_base::concat_set(const sc_signed &src, int low_i)
{
    if (low_i < src.length())
        *this = src >> low_i;
    else
        *this = (src < 0) ? (int_type)-1 : 0;
}

void
sc_int_base::concat_set(const sc_unsigned &src, int low_i)
{
    if (low_i < src.length())
        *this = src >> low_i;
    else
        *this = 0;
}

void
sc_int_base::concat_set(uint64 src, int low_i)
{
    *this = (low_i < 64) ? src >> low_i : 0;
}

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

} // namespace sc_dt;