/* s_rintl.c -- long double version of s_rint.c.

 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.

 */

/*

 * ====================================================

 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.

 *

 * Developed at SunPro, a Sun Microsystems, Inc. business.

 * Permission to use, copy, modify, and distribute this

 * software is freely granted, provided that this notice

 * is preserved.

 * ====================================================

 */

#if defined (LIBM_SCCS) && ! defined (lint)

static char rcsid[] = "$NetBSD: $";

#endif

/*

 * rintl(x)

 * Return x rounded to integral value according to the prevailing

 * rounding mode.

 * Method:

 *	Using floating addition.

 * Exception:

 *	Inexact flag raised if x not equal to rintl(x).

 */

#include <math.h>

#include <math_private.h>

#include <libm-alias-ldouble.h>

#include <math-use-builtins.h>

_Float128

__rintl (_Float128 x)

{

#if USE_RINTL_BUILTIN

  return __builtin_rintl (x);

#else

  /* Use generic implementation.  */

  static const _Float128

    TWO112[2] = {

		 5.19229685853482762853049632922009600E+33L, /* 0x406F000000000000, 0 */

		 -5.19229685853482762853049632922009600E+33L  /* 0xC06F000000000000, 0 */

  };

  int64_t i0, j0, sx;

  uint64_t i1 __attribute__ ((unused));

  _Float128 w, t;

  GET_LDOUBLE_WORDS64 (i0, i1, x);

  sx = (((uint64_t) i0) >> 63);

  j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;

  if (j0 < 112)

    {

      if (j0 < 0)

	{

	  w = TWO112[sx] + x;

	  t = w - TWO112[sx];

	  GET_LDOUBLE_MSW64 (i0, t);

	  SET_LDOUBLE_MSW64 (t, (i0 & 0x7fffffffffffffffLL) | (sx << 63));

	  return t;

	}

    }

  else

    {

      if (j0 == 0x4000)

	return x + x;		/* inf or NaN  */

      else

	return x;		/* x is integral  */

    }

  w = TWO112[sx] + x;

  return w - TWO112[sx];

#endif /* ! USE_RINTL_BUILTIN  */

}

libm_alias_ldouble (__rint, rint)