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/* Copyright (C) 2013-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
The GNU C Library 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
/* ISA 2.07 provides fast GPR to FP instruction (mfvsr{d,wz}) which make
generic implementation faster. Also disables for old ISAs that do not
have ceil/floor instructions. */
#if defined(_ARCH_PWR8) || !defined(_ARCH_PWR5X)
# include <sysdeps/ieee754/ldbl-opt/s_modf.c>
#else
# include <math.h>
# include <math_ldbl_opt.h>
# include <libm-alias-double.h>
double
__modf (double x, double *iptr)
{
if (__builtin_isinf (x))
{
*iptr = x;
return copysign (0.0, x);
}
else if (__builtin_isnan (x))
{
*iptr = NAN;
return NAN;
}
if (x >= 0.0)
{
*iptr = floor (x);
return copysign (x - *iptr, x);
}
else
{
*iptr = ceil (x);
return copysign (x - *iptr, x);
}
}
# ifndef __modf
libm_alias_double (__modf, modf)
# if LONG_DOUBLE_COMPAT (libc, GLIBC_2_0)
compat_symbol (libc, __modf, modfl, GLIBC_2_0);
# endif
# endif
#endif
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