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/* Copy sign into another 'long double' number.
Copyright (C) 2011-2021 Free Software Foundation, Inc.
This program 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 of the License, or
(at your option) any later version.
This program 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 this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include <math.h>
#if HAVE_SAME_LONG_DOUBLE_AS_DOUBLE
long double
copysignl (long double x, long double y)
{
return copysign (x, y);
}
#else
# if defined __hpux && !defined __GNUC__
# include <float.h>
/* HP cc on HP-UX 10.20 has a bug with the constant expression -0.0L. */
static long double
compute_minus_zerol (void)
{
return -LDBL_MIN * LDBL_MIN;
}
# define minus_zerol compute_minus_zerol ()
/* HP cc on HP-UX 11 has a bug: When x is a positive zero, - x comes out
as a positive zero, rather than as a minus zero. Work around it. */
static long double
unary_minus (long double x)
{
if (x == 0.0L)
{
if (signbit (x))
return 0.0L;
else
return minus_zerol;
}
else
return - x;
}
# endif
long double
copysignl (long double x, long double y)
{
# if defined __hpux && !defined __GNUC__
return (signbit (x) != signbit (y) ? unary_minus (x) : x);
# else
return (signbit (x) != signbit (y) ? - x : x);
# endif
}
#endif
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