scfx_utils.hh

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/*****************************************************************************
 
  scfx_utils.h -
 
  Original Author: Martin Janssen, Synopsys, Inc.
 
 *****************************************************************************/
 
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// $Log: scfx_utils.h,v $
// Revision 1.2  2009/02/28 00:26:20  acg
//  Andy Goodrich: bug fixes.
//
// Revision 1.1.1.1  2006/12/15 20:31:36  acg
// SystemC 2.2
//
// Revision 1.3  2006/01/13 18:53:58  acg
// Andy Goodrich: added $Log command so that CVS comments are reproduced in
// the source.
//
 
#ifndef __SYSTEMC_EXT_DT_FX_SCFX_UTILS_HH__
#define __SYSTEMC_EXT_DT_FX_SCFX_UTILS_HH__
 
#include "sc_fxdefs.hh"
#include "scfx_params.hh"
#include "scfx_string.hh"
 
namespace sc_dt
{
 
// ----------------------------------------------------------------------------
//  Find the most and least significant non-zero bits in a unsigned long
// ----------------------------------------------------------------------------
 
#define MSB_STATEMENT(n) if (x >> n) { x >>= n; i += n; }
 
inline int
scfx_find_msb(unsigned long x)
{
    int i = 0;
#   if SC_LONG_64
        MSB_STATEMENT(32);
#   endif // SC_LONG_64
    MSB_STATEMENT(16);
    MSB_STATEMENT(8);
    MSB_STATEMENT(4);
    MSB_STATEMENT(2);
    MSB_STATEMENT(1);
    return i;
}
 
#undef MSB_STATEMENT
 
#define LSB_STATEMENT(n) if (x << n) { x <<= n; i -= n; }
 
inline int
scfx_find_lsb(unsigned long x)
{
    int i;
#   if SC_LONG_64
        i = 63;
        LSB_STATEMENT(32);
#   else
        i = 31;
#   endif // SC_LONG_64
    LSB_STATEMENT(16);
    LSB_STATEMENT(8);
    LSB_STATEMENT(4);
    LSB_STATEMENT(2);
    LSB_STATEMENT(1);
    return i;
}
 
#undef LSB_STATEMENT
 
 
// ----------------------------------------------------------------------------
//  Utilities for parsing a character string number
// ----------------------------------------------------------------------------
 
inline int
scfx_parse_sign(const char *&s, bool &sign_char)
{
    int sign = 1;
 
    if (*s == '+') {
        ++s;
        sign_char = true;
    } else if (*s == '-' ) {
        sign = -1;
        ++s;
        sign_char = true;
    } else {
        sign_char = false;
    }
 
    return sign;
}
 
inline sc_numrep
scfx_parse_prefix(const char *&s)
{
    if (s[0] == '0') {
        switch (s[1]) {
          case 'b':
          case 'B':
            {
                if ((s[2] == 'u' || s[2] == 'U') &&
                    (s[3] == 's' || s[3] == 'S')) {
                    s += 4;
                    return SC_BIN_US;
                }
                if ((s[2] == 's' || s[2] == 'S') &&
                    (s[3] == 'm' || s[3] == 'M')) {
                    s += 4;
                    return SC_BIN_SM;
                }
                s += 2;
                return SC_BIN;
            }
          case 'o':
          case 'O':
            {
                if ((s[2] == 'u' || s[2] == 'U') &&
                    (s[3] == 's' || s[3] == 'S')) {
                    s += 4;
                    return SC_OCT_US;
                }
                if ((s[2] == 's' || s[2] == 'S') &&
                    (s[3] == 'm' || s[3] == 'M')) {
                    s += 4;
                    return SC_OCT_SM;
                }
                s += 2;
                return SC_OCT;
            }
          case 'x':
          case 'X':
            {
                if ((s[2] == 'u' || s[2] == 'U') &&
                    (s[3] == 's' || s[3] == 'S')) {
                    s += 4;
                    return SC_HEX_US;
                }
                if ((s[2] == 's' || s[2] == 'S') &&
                    (s[3] == 'm' || s[3] == 'M')) {
                    s += 4;
                    return SC_HEX_SM;
                }
                s += 2;
                return SC_HEX;
            }
          case 'd':
          case 'D':
            {
                s += 2;
                return SC_DEC;
            }
          case 'c':
          case 'C':
            {
                if ((s[2] == 's' || s[2] == 'S') &&
                    (s[3] == 'd' || s[3] == 'D')) {
                    s += 4;
                    return SC_CSD;
                }
                break;
            }
          default:
            break;
        }
    }
 
    return SC_DEC;
}
 
inline int
scfx_parse_base(const char *&s)
{
    const char *s1 = s + 1;
 
    int base = 10;
 
    if (*s == '0') {
        switch (*s1) {
          case 'b':
          case 'B': base =  2; s += 2; break;
          case 'o':
          case 'O': base =  8; s += 2; break;
          case 'd':
          case 'D': base = 10; s += 2; break;
          case 'x':
          case 'X': base = 16; s += 2; break;
        }
    }
 
    return base;
}
 
inline bool
scfx_is_equal(const char *a, const char *b)
{
    while (*a != 0 && *b != 0 && *a == *b) {
        ++ a;
        ++ b;
    }
    return (*a == 0 && *b == 0);
}
 
inline bool
scfx_is_nan(const char *s)
{
    return scfx_is_equal(s, "NaN");
}
 
inline bool
scfx_is_inf(const char *s)
{
    return (scfx_is_equal(s, "Inf") || scfx_is_equal(s, "Infinity"));
}
 
inline bool
scfx_exp_start(const char *s)
{
    if (*s == 'e' || *s == 'E') {
        ++s;
        if (*s == '+' || *s == '-')
            return true;
    }
    return false;
}
 
inline bool
scfx_is_digit(char c, sc_numrep numrep)
{
    bool is_digit;
 
    switch(numrep) {
      case SC_DEC:
        {
            switch(c) {
              case '0': case '1': case '2': case '3': case '4':
              case '5': case '6': case '7': case '8': case '9':
                {
                    is_digit = true;
                    break;
                }
              default:
                    is_digit = false;
            }
            break;
        }
      case SC_BIN:
      case SC_BIN_US:
      case SC_BIN_SM:
        {
            switch(c) {
              case '0': case '1':
                {
                    is_digit = true;
                    break;
                }
              default:
                is_digit = false;
            }
            break;
        }
      case SC_OCT:
      case SC_OCT_US:
      case SC_OCT_SM:
        {
            switch(c) {
              case '0': case '1': case '2': case '3':
              case '4': case '5': case '6': case '7':
                {
                    is_digit = true;
                    break;
                }
              default:
                is_digit = false;
            }
            break;
        }
      case SC_HEX:
      case SC_HEX_US:
      case SC_HEX_SM:
        {
            switch (c) {
              case '0': case '1': case '2': case '3': case '4':
              case '5': case '6': case '7': case '8': case '9':
              case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
              case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
                {
                    is_digit = true;
                    break;
                }
              default:
                is_digit = false;
            }
            break;
        }
      case SC_CSD:
        {
            switch (c) {
              case '0': case '1': case '-':
                {
                    is_digit = true;
                    break;
                }
              default:
                is_digit = false;
            }
            break;
        }
      default:
        is_digit = false;
    }
 
    return is_digit;
}
 
inline int
scfx_to_digit(char c, sc_numrep numrep)
{
    int to_digit;
 
    switch (numrep) {
      case SC_DEC:
      case SC_BIN:
      case SC_BIN_US:
      case SC_BIN_SM:
      case SC_OCT:
      case SC_OCT_US:
      case SC_OCT_SM:
        {
            to_digit = c - '0';
            break;
        }
      case SC_HEX:
      case SC_HEX_US:
      case SC_HEX_SM:
        {
            switch (c) {
              case '0': case '1': case '2': case '3': case '4':
              case '5': case '6': case '7': case '8': case '9':
                to_digit = c - '0';
                break;
              case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
                to_digit = c - 'a' + 10;
                break;
              case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
                to_digit = c - 'A' + 10;
                break;
              default:
                to_digit = -2;
            }
            break;
        }
      case SC_CSD:
        {
            if (c == '-')
                to_digit = -1;
            else
                to_digit = c - '0';
            break;
        }
      default:
        to_digit = -2;
    }
 
    return to_digit;
}
 
 
// ----------------------------------------------------------------------------
//  Utilities for printing a character string number
// ----------------------------------------------------------------------------
 
inline void scfx_print_nan(scfx_string &s) { s += "NaN"; }
inline void
scfx_print_inf(scfx_string &s, bool negative)
{
    if (negative)
        s += "-Inf";
    else
        s += "Inf";
}
 
inline void
scfx_print_prefix(scfx_string &s, sc_numrep numrep)
{
    switch (numrep) {
      case SC_DEC:
        s += "0d";
        break;
      case SC_BIN:
        s += "0b";
        break;
      case SC_BIN_US:
        s += "0bus";
        break;
      case SC_BIN_SM:
        s += "0bsm";
        break;
      case SC_OCT:
        s += "0o";
        break;
      case SC_OCT_US:
        s += "0ous";
        break;
      case SC_OCT_SM:
        s += "0osm";
        break;
      case SC_HEX:
        s += "0x";
        break;
      case SC_HEX_US:
        s += "0xus";
        break;
      case SC_HEX_SM:
        s += "0xsm";
        break;
      case SC_CSD:
        s += "0csd";
        break;
      default:
        s += "unknown";
    }
}
 
inline void
scfx_print_exp(scfx_string &s, int exp)
{
    if (exp != 0) {
        s += 'e';
 
        if (exp < 0) {
            exp = - exp;
            s += '-';
        } else {
            s += '+';
        }
 
        bool first = true;
        int scale = 1000000000;
        do {
            int digit = exp / scale;
            exp = exp % scale;
            if (digit != 0 || !first) {
                s += static_cast<char>(digit + '0');
                first = false;
            }
            scale /= 10;
        }
        while (scale > 0);
    }
}
 
void scfx_tc2csd(scfx_string &, int);
void scfx_csd2tc(scfx_string &);
 
} // namespace sc_dt
 
#endif // __SYSTEMC_EXT_DT_FX_SCFX_UTILS_HH__