/* s_ceill.c -- long double version of s_ceil.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

/*

 * ceill(x)

 * Return x rounded toward -inf to integral value

 * Method:

 *	Bit twiddling.

 */

#include <math.h>

#include <math_private.h>

#include <libm-alias-ldouble.h>

#include <math-use-builtins.h>

_Float128

__ceill (_Float128 x)

{

#if USE_CEILL_BUILTIN

  return __builtin_ceill (x);

#else

  /* Use generic implementation.  */

  int64_t i0, i1, j0;

  uint64_t i, j;

  GET_LDOUBLE_WORDS64 (i0, i1, x);

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

  if (j0 < 48)

    {

      if (j0 < 0)

	{

	  /* return 0 * sign (x) if |x| < 1  */

	  if (i0 < 0)

	    {

	      i0 = 0x8000000000000000ULL;

	      i1 = 0;

	    }

	  else if ((i0 | i1) != 0)

	    {

	      i0 = 0x3fff000000000000ULL;

	      i1 = 0;

	    }

	}

      else

	{

	  i = (0x0000ffffffffffffULL) >> j0;

	  if (((i0 & i) | i1) == 0)

	    return x;		/* x is integral  */

	  if (i0 > 0)

	    i0 += (0x0001000000000000LL) >> j0;

	  i0 &= (~i);

	  i1 = 0;

	}

    }

  else if (j0 > 111)

    {

      if (j0 == 0x4000)

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

      else

	return x;		/* x is integral  */

    }

  else

    {

      i = -1ULL >> (j0 - 48);

      if ((i1 & i) == 0)

	return x;		/* x is integral  */

      if (i0 > 0)

	{

	  if (j0 == 48)

	    i0 += 1;

	  else

	    {

	      j = i1 + (1LL << (112 - j0));

	      if (j < i1)

		i0 += 1;	/* got a carry  */

	      i1 = j;

	    }

	}

      i1 &= (~i);

    }

  SET_LDOUBLE_WORDS64 (x, i0, i1);

  return x;

#endif /* ! USE_CEILL_BUILTIN  */

}

libm_alias_ldouble (__ceil, ceil)