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/* d-ctfloat.cc -- D frontend interface to the gcc back-end.
Copyright (C) 2020-2022 Free Software Foundation, Inc.
GCC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GCC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
#include "config.h"
#include "system.h"
#include "coretypes.h"
#include "dmd/root/ctfloat.h"
#include "dmd/target.h"
#include "tree.h"
/* Implements the CTFloat interface defined by the frontend.
Compile-time floating-pointer helper functions. */
/* Return the absolute value of R. */
real_t
CTFloat::fabs (real_t r)
{
real_t x;
real_arithmetic (&x.rv (), ABS_EXPR, &r.rv (), NULL);
return x.normalize ();
}
/* Return the value of R * 2 ^^ EXP. */
real_t
CTFloat::ldexp (real_t r, int exp)
{
real_t x;
real_ldexp (&x.rv (), &r.rv (), exp);
return x.normalize ();
}
/* Return true if longdouble value X is identical to Y. */
bool
CTFloat::isIdentical (real_t x, real_t y)
{
real_value rx = x.rv ();
real_value ry = y.rv ();
return (REAL_VALUE_ISNAN (rx) && REAL_VALUE_ISNAN (ry))
|| real_identical (&rx, &ry);
}
/* Return true if real_t value R is NaN. */
bool
CTFloat::isNaN (real_t r)
{
return REAL_VALUE_ISNAN (r.rv ());
}
/* Same as isNaN, but also check if is signalling. */
bool
CTFloat::isSNaN (real_t r)
{
return REAL_VALUE_ISSIGNALING_NAN (r.rv ());
}
/* Return true if real_t value is +Inf. */
bool
CTFloat::isInfinity (real_t r)
{
return REAL_VALUE_ISINF (r.rv ());
}
/* Return a real_t value from string BUFFER rounded to long double mode. */
real_t
CTFloat::parse (const char *buffer, bool *overflow)
{
real_t r;
real_from_string3 (&r.rv (), buffer, TYPE_MODE (long_double_type_node));
/* Front-end checks overflow to see if the value is representable. */
if (overflow && r == target.RealProperties.infinity)
*overflow = true;
return r;
}
/* Format the real_t value R to string BUFFER as a decimal or hexadecimal,
converting the result to uppercase if FMT requests it. */
int
CTFloat::sprint (char *buffer, char fmt, real_t r)
{
if (fmt == 'a' || fmt == 'A')
{
/* Converting to a hexadecimal string. */
real_to_hexadecimal (buffer, &r.rv (), 32, 0, 1);
int buflen;
switch (fmt)
{
case 'A':
buflen = strlen (buffer);
for (int i = 0; i < buflen; i++)
buffer[i] = TOUPPER (buffer[i]);
return buflen;
case 'a':
return strlen (buffer);
default:
gcc_unreachable ();
}
}
else
{
/* Note: restricting the precision of significant digits to 18. */
real_to_decimal (buffer, &r.rv (), 32, 18, 1);
return strlen (buffer);
}
}
/* Return a hash value for real_t value R. */
size_t
CTFloat::hash (real_t r)
{
return real_hash (&r.rv ());
}
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