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Accellera licenses this file to you under the Apache License, Version 2.0
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/*****************************************************************************
scfx_utils.h -
Original Author: Martin Janssen, Synopsys, Inc.
*****************************************************************************/
/*****************************************************************************
MODIFICATION LOG - modifiers, enter your name, affiliation, date and
changes you are making here.
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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__