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/* Extract signed integral and fractional values.
Copyright (C) 1993-2025 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 Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <math.h>
#include <libm-alias-double.h>
#include "math_config.h"
#include <math-use-builtins-trunc.h>
double
__modf (double x, double *iptr)
{
uint64_t t = asuint64 (x);
#if USE_TRUNC_BUILTIN
if (is_inf (t))
{
*iptr = x;
return copysign (0.0, x);
}
*iptr = trunc (x);
return copysign (x - *iptr, x);
#else
int e = get_exponent (t);
/* No fraction part. */
if (e < MANTISSA_WIDTH)
{
if (e < 0)
{
/* |x|<1 -> *iptr = +-0 */
*iptr = asdouble (t & SIGN_MASK);
return x;
}
uint64_t i = MANTISSA_MASK >> e;
if ((t & i) == 0)
{
/* x in integral, return +-0 */
*iptr = x;
return asdouble (t & SIGN_MASK);
}
*iptr = asdouble (t & ~i);
return x - *iptr;
}
/* Set invalid operation for sNaN. */
*iptr = x * 1.0;
if ((e == 0x400) && (t & MANTISSA_MASK))
return *iptr;
return asdouble (t & SIGN_MASK);
#endif
}
#ifndef __modf
libm_alias_double (__modf, modf)
#endif
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