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/*****************************************************************************
sc_fxval.cpp -
Original Author: Martin Janssen, Synopsys, Inc.
*****************************************************************************/
/*****************************************************************************
MODIFICATION LOG - modifiers, enter your name, affiliation, date and
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*****************************************************************************/
// $Log: sc_fxval.cpp,v $
// Revision 1.1.1.1 2006/12/15 20:20:04 acg
// SystemC 2.3
//
// Revision 1.3 2006/01/13 18:53:58 acg
// Andy Goodrich: added $Log command so that CVS comments are reproduced in
// the source.
//
#include <cctype>
#include <cfloat>
#include <cmath>
#include <cstdlib>
#include "systemc/ext/dt/fx/sc_fxval.hh"
#include "systemc/ext/utils/messages.hh"
namespace sc_dt
{
// ----------------------------------------------------------------------------
// CLASS : sc_fxval
//
// Fixed-point value type; arbitrary precision.
// ----------------------------------------------------------------------------
// explicit conversion to character string
const std::string
sc_fxval::to_string() const
{
return std::string(m_rep->to_string(SC_DEC, -1, SC_E));
}
const std::string
sc_fxval::to_string(sc_numrep numrep) const
{
return std::string(m_rep->to_string(numrep, -1, SC_E));
}
const std::string
sc_fxval::to_string(sc_numrep numrep, bool w_prefix) const
{
return std::string(m_rep->to_string(numrep, (w_prefix ? 1 : 0), SC_E));
}
const std::string
sc_fxval::to_string(sc_fmt fmt) const
{
return std::string(m_rep->to_string(SC_DEC, -1, fmt));
}
const std::string
sc_fxval::to_string(sc_numrep numrep, sc_fmt fmt) const
{
return std::string(m_rep->to_string(numrep, -1, fmt));
}
const std::string
sc_fxval::to_string(sc_numrep numrep, bool w_prefix, sc_fmt fmt) const
{
return std::string(m_rep->to_string(numrep, (w_prefix ? 1 : 0), fmt));
}
const std::string
sc_fxval::to_dec() const
{
return std::string(m_rep->to_string(SC_DEC, -1, SC_E));
}
const std::string
sc_fxval::to_bin() const
{
return std::string(m_rep->to_string(SC_BIN, -1, SC_E));
}
const std::string
sc_fxval::to_oct() const
{
return std::string(m_rep->to_string(SC_OCT, -1, SC_E));
}
const std::string
sc_fxval::to_hex() const
{
return std::string(m_rep->to_string(SC_HEX, -1, SC_E));
}
// print or dump content
void sc_fxval::print(::std::ostream &os) const { m_rep->print(os); }
void
sc_fxval::scan(::std::istream &is)
{
std::string s;
is >> s;
*this = s.c_str();
}
void
sc_fxval::dump(::std::ostream &os) const
{
os << "sc_fxval" << ::std::endl;
os << "(" << ::std::endl;
os << "rep = ";
m_rep->dump(os);
// TO BE COMPLETED
// os << "r_flag = " << m_r_flag << ::std::endl;
// os << "observer = ";
// if (m_observer != 0)
// m_observer->dump(os);
// else
// os << "0" << ::std::endl;
os << ")" << ::std::endl;
}
// protected methods and friend functions
sc_fxval_observer *
sc_fxval::lock_observer() const
{
SC_ASSERT_(m_observer != 0, "lock observer failed");
sc_fxval_observer *tmp = m_observer;
m_observer = 0;
return tmp;
}
void
sc_fxval::unlock_observer(sc_fxval_observer *observer_) const
{
SC_ASSERT_(observer_ != 0, "unlock observer failed");
m_observer = observer_;
}
// ----------------------------------------------------------------------------
// CLASS : sc_fxval_fast
//
// Fixed-point value types; limited precision.
// ----------------------------------------------------------------------------
static void
print_dec(scfx_string &s, scfx_ieee_double id, int w_prefix, sc_fmt fmt)
{
if (id.negative() != 0) {
id.negative(0);
s += '-';
}
if (w_prefix == 1) {
scfx_print_prefix(s, SC_DEC);
}
if (id.is_zero()) {
s += '0';
return;
}
// split 'id' into its integer and fractional part
double int_part;
double frac_part = std::modf(static_cast<double>(id), &int_part);
int i;
// print integer part
int int_digits = 0;
int int_zeros = 0;
if (int_part != 0.0) {
int_digits = (int)std::ceil(std::log10(int_part + 1.0));
int len = s.length();
s.append(int_digits);
bool zero_digits = (frac_part == 0.0 && fmt != SC_F);
for (i = int_digits + len - 1; i >= len; i--) {
unsigned int remainder = (unsigned int)std::fmod(int_part, 10.0);
s[i] = static_cast<char>('0' + remainder);
if (zero_digits) {
if (remainder == 0)
int_zeros++;
else
zero_digits = false;
}
int_part /= 10.0;
}
// discard trailing zeros from int_part
s.discard(int_zeros);
if (s[len] == '0') {
// int_digits was overestimated by one
s.remove(len);
--int_digits;
}
}
// print fractional part
int frac_digits = 0;
int frac_zeros = 0;
if (frac_part != 0.0) {
s += '.';
bool zero_digits = (int_digits == 0 && fmt != SC_F);
frac_zeros = (int)std::floor(-std::log10(frac_part + DBL_EPSILON));
frac_part *= std::pow(10.0, frac_zeros);
frac_digits = frac_zeros;
if (!zero_digits) {
for (i = 0; i < frac_zeros; i++)
s += '0';
frac_zeros = 0;
}
while (frac_part != 0.0) {
frac_part *= 10.0;
int n = static_cast<int>(frac_part);
if (zero_digits) {
if (n == 0)
frac_zeros++;
else
zero_digits = false;
}
if (!zero_digits)
s += static_cast<char>('0' + n);
frac_part -= n;
frac_digits++;
}
}
// print exponent
if (fmt != SC_F) {
if (frac_digits == 0)
scfx_print_exp(s, int_zeros);
else if (int_digits == 0)
scfx_print_exp(s, -frac_zeros);
}
}
static void
print_other(scfx_string &s, const scfx_ieee_double &id, sc_numrep numrep,
int w_prefix, sc_fmt fmt, const scfx_params *params)
{
scfx_ieee_double id2 = id;
sc_numrep numrep2 = numrep;
bool numrep_is_sm = (numrep == SC_BIN_SM ||
numrep == SC_OCT_SM ||
numrep == SC_HEX_SM);
if (numrep_is_sm) {
if (id2.negative() != 0) {
s += '-';
id2.negative(0);
}
switch (numrep) {
case SC_BIN_SM:
numrep2 = SC_BIN_US;
break;
case SC_OCT_SM:
numrep2 = SC_OCT_US;
break;
case SC_HEX_SM:
numrep2 = SC_HEX_US;
break;
default:
;
}
}
if (w_prefix != 0) {
scfx_print_prefix(s, numrep);
}
numrep = numrep2;
sc_fxval_fast a(id2);
int msb, lsb;
if (params != 0) {
msb = params->iwl() - 1;
lsb = params->iwl() - params->wl();
if (params->enc() == SC_TC_ &&
(numrep == SC_BIN_US ||
numrep == SC_OCT_US ||
numrep == SC_HEX_US) &&
!numrep_is_sm &&
params->wl() > 1) {
--msb;
} else if (params->enc() == SC_US_ &&
(numrep == SC_BIN ||
numrep == SC_OCT ||
numrep == SC_HEX ||
numrep == SC_CSD)) {
++msb;
}
} else {
if (a.is_zero()) {
msb = 0;
lsb = 0;
} else {
msb = id2.exponent() + 1;
while (a.get_bit(msb) == a.get_bit(msb - 1))
--msb;
if (numrep == SC_BIN_US ||
numrep == SC_OCT_US ||
numrep == SC_HEX_US) {
--msb;
}
lsb = id2.exponent() - 52;
while (!a.get_bit(lsb))
++lsb;
}
}
int step;
switch (numrep) {
case SC_BIN:
case SC_BIN_US:
case SC_CSD:
step = 1;
break;
case SC_OCT:
case SC_OCT_US:
step = 3;
break;
case SC_HEX:
case SC_HEX_US:
step = 4;
break;
default:
SC_REPORT_FATAL(sc_core::SC_ID_ASSERTION_FAILED_,
"unexpected sc_numrep");
sc_core::sc_abort();
}
msb = (int)std::ceil(double(msb + 1) / step) * step - 1;
lsb = (int)std::floor(double(lsb) / step) * step;
if (msb < 0) {
s += '.';
if (fmt == SC_F) {
int sign = (id2.negative() != 0) ? (1 << step) - 1 : 0;
for (int i = (msb + 1) / step; i < 0; i++) {
if (sign < 10)
s += static_cast<char>(sign + '0');
else
s += static_cast<char>(sign + 'a' - 10);
}
}
}
int i = msb;
while (i >= lsb) {
int value = 0;
for (int j = step - 1; j >= 0; --j) {
value += static_cast<int>(a.get_bit(i)) << j;
--i;
}
if (value < 10)
s += static_cast<char>(value + '0');
else
s += static_cast<char>(value + 'a' - 10);
if (i == -1)
s += '.';
}
if (lsb > 0 && fmt == SC_F) {
for (int i = lsb / step; i > 0; i--)
s += '0';
}
if (s[s.length() - 1] == '.')
s.discard(1);
if (fmt != SC_F) {
if (msb < 0)
scfx_print_exp(s, (msb + 1) / step);
else if (lsb > 0)
scfx_print_exp(s, lsb / step);
}
if (numrep == SC_CSD)
scfx_tc2csd(s, w_prefix);
}
const char *
to_string(const scfx_ieee_double &id, sc_numrep numrep, int w_prefix,
sc_fmt fmt, const scfx_params *params=0)
{
static scfx_string s;
s.clear();
if (id.is_nan()) {
scfx_print_nan(s);
} else if (id.is_inf()) {
scfx_print_inf(s, static_cast<bool>(id.negative()));
} else if (id.negative() && !id.is_zero() &&
(numrep == SC_BIN_US ||
numrep == SC_OCT_US ||
numrep == SC_HEX_US)) {
s += "negative";
} else if (numrep == SC_DEC) {
sc_dt::print_dec(s, id, w_prefix, fmt);
} else {
sc_dt::print_other(s, id, numrep, w_prefix, fmt, params);
}
return s;
}
// explicit conversion to character string
const std::string
sc_fxval_fast::to_string() const
{
return std::string(sc_dt::to_string(m_val, SC_DEC, -1, SC_E));
}
const std::string
sc_fxval_fast::to_string(sc_numrep numrep) const
{
return std::string(sc_dt::to_string(m_val, numrep, -1, SC_E));
}
const std::string
sc_fxval_fast::to_string(sc_numrep numrep, bool w_prefix) const
{
return std::string(sc_dt::to_string(m_val, numrep, (w_prefix ? 1 : 0),
SC_E));
}
const std::string
sc_fxval_fast::to_string(sc_fmt fmt) const
{
return std::string(sc_dt::to_string(m_val, SC_DEC, -1, fmt));
}
const std::string
sc_fxval_fast::to_string(sc_numrep numrep, sc_fmt fmt) const
{
return std::string(sc_dt::to_string(m_val, numrep, -1, fmt));
}
const std::string
sc_fxval_fast::to_string(sc_numrep numrep, bool w_prefix, sc_fmt fmt) const
{
return std::string(sc_dt::to_string(m_val, numrep, (w_prefix ? 1 : 0),
fmt));
}
const std::string
sc_fxval_fast::to_dec() const
{
return std::string(sc_dt::to_string(m_val, SC_DEC, -1, SC_E));
}
const std::string
sc_fxval_fast::to_bin() const
{
return std::string(sc_dt::to_string(m_val, SC_BIN, -1, SC_E));
}
const std::string
sc_fxval_fast::to_oct() const
{
return std::string(sc_dt::to_string(m_val, SC_OCT, -1, SC_E));
}
const std::string
sc_fxval_fast::to_hex() const
{
return std::string(sc_dt::to_string(m_val, SC_HEX, -1, SC_E));
}
// print or dump content
void
sc_fxval_fast::print(::std::ostream &os) const
{
os << sc_dt::to_string(m_val, SC_DEC, -1, SC_E);
}
void
sc_fxval_fast::scan(::std::istream &is)
{
std::string s;
is >> s;
*this = s.c_str();
}
void
sc_fxval_fast::dump(::std::ostream &os) const
{
os << "sc_fxval_fast" << ::std::endl;
os << "(" << ::std::endl;
os << "val = " << m_val << ::std::endl;
// TO BE COMPLETED
// os << "r_flag = " << m_r_flag << ::std::endl;
// os << "observer = ";
// if (m_observer != 0)
// m_observer->dump(os);
// else
// os << "0" << ::std::endl;
os << ")" << ::std::endl;
}
// internal use only;
bool
sc_fxval_fast::get_bit(int i) const
{
scfx_ieee_double id(m_val);
if (id.is_zero() || id.is_nan() || id.is_inf())
return false;
// convert to two's complement
unsigned int m0 = id.mantissa0();
unsigned int m1 = id.mantissa1();
if (id.is_normal())
m0 += 1U << 20;
if (id.negative() != 0) {
m0 = ~ m0;
m1 = ~ m1;
unsigned int tmp = m1;
m1 += 1U;
if (m1 <= tmp)
m0 += 1U;
}
// get the right bit
int j = i - id.exponent();
if ((j += 20) >= 32)
return ((m0 & 1U << 31) != 0);
else if (j >= 0)
return ((m0 & 1U << j) != 0);
else if ((j += 32) >= 0)
return ((m1 & 1U << j) != 0);
else
return false;
}
// protected methods and friend functions
sc_fxval_fast_observer *
sc_fxval_fast::lock_observer() const
{
SC_ASSERT_(m_observer != 0, "lock observer failed");
sc_fxval_fast_observer *tmp = m_observer;
m_observer = 0;
return tmp;
}
void
sc_fxval_fast::unlock_observer(sc_fxval_fast_observer *observer_) const
{
SC_ASSERT_(observer_ != 0, "unlock observer failed");
m_observer = observer_;
}
#define SCFX_FAIL_IF_(cnd) \
{ \
if ((cnd)) \
return static_cast<double>(scfx_ieee_double::nan()); \
}
double
sc_fxval_fast::from_string(const char *s)
{
SCFX_FAIL_IF_(s == 0 || *s == 0);
scfx_string s2;
s2 += s;
s2 += '\0';
bool sign_char;
int sign = scfx_parse_sign(s, sign_char);
sc_numrep numrep = scfx_parse_prefix(s);
int base = 0;
switch (numrep) {
case SC_DEC:
{
base = 10;
if (scfx_is_nan(s)) // special case: NaN
return static_cast<double>(scfx_ieee_double::nan());
if (scfx_is_inf(s)) // special case: Infinity
return static_cast<double>(scfx_ieee_double::inf(sign));
break;
}
case SC_BIN:
case SC_BIN_US:
{
SCFX_FAIL_IF_(sign_char);
base = 2;
break;
}
case SC_BIN_SM:
{
base = 2;
break;
}
case SC_OCT:
case SC_OCT_US:
{
SCFX_FAIL_IF_(sign_char);
base = 8;
break;
}
case SC_OCT_SM:
{
base = 8;
break;
}
case SC_HEX:
case SC_HEX_US:
{
SCFX_FAIL_IF_(sign_char);
base = 16;
break;
}
case SC_HEX_SM:
{
base = 16;
break;
}
case SC_CSD:
{
SCFX_FAIL_IF_(sign_char);
base = 2;
scfx_csd2tc(s2);
s = (const char*) s2 + 4;
numrep = SC_BIN;
break;
}
default:;// Martin, what is default???
}
//
// find end of mantissa and count the digits and points
//
const char *end = s;
bool based_point = false;
int int_digits = 0;
int frac_digits = 0;
while (*end) {
if (scfx_exp_start(end))
break;
if (*end == '.') {
SCFX_FAIL_IF_(based_point);
based_point = true;
} else {
SCFX_FAIL_IF_(!scfx_is_digit(*end, numrep));
if (based_point)
frac_digits++;
else
int_digits++;
}
end++;
}
SCFX_FAIL_IF_(int_digits == 0 && frac_digits == 0);
// [ exponent ]
int exponent = 0;
if (*end) {
for (const char *e = end + 2; *e; e++)
SCFX_FAIL_IF_(!scfx_is_digit(*e, SC_DEC));
exponent = std::atoi(end + 1);
}
//
// convert the mantissa
//
double integer = 0.0;
if (int_digits != 0) {
bool first_digit = true;
for (; s < end; s++) {
if (*s == '.')
break;
if (first_digit) {
integer = scfx_to_digit(*s, numrep);
switch (numrep) {
case SC_BIN:
case SC_OCT:
case SC_HEX:
{
if (integer >= (base >> 1))
integer -= base; // two's complement
break;
}
default:
;
}
first_digit = false;
} else {
integer *= base;
integer += scfx_to_digit(*s, numrep);
}
}
}
// [ . fraction ]
double fraction = 0.0;
if (frac_digits != 0) {
s++; // skip '.'
bool first_digit = (int_digits == 0);
double scale = 1.0;
for (; s < end; s++) {
scale /= base;
if (first_digit) {
fraction = scfx_to_digit(*s, numrep);
switch (numrep) {
case SC_BIN:
case SC_OCT:
case SC_HEX:
{
if (fraction >= (base >> 1))
fraction -= base; // two's complement
break;
}
default:
;
}
fraction *= scale;
first_digit = false;
} else {
fraction += scfx_to_digit(*s, numrep) * scale;
}
}
}
double exp =
(exponent != 0) ? std::pow((double) base, (double) exponent) : 1;
return (sign * (integer + fraction) * exp);
}
#undef SCFX_FAIL_IF_
} // namespace sc_dt