/* Round float to integer away from zero.

   Copyright (C) 1997-2018 Free Software Foundation, Inc.

   This file is part of the GNU C Library.

   Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.

   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

   <http://www.gnu.org/licenses/>.  */

#include <math.h>

#include <math_private.h>

#include <libm-alias-float.h>

#include <math-use-builtins.h>

float

__roundf (float x)

{

#if USE_ROUNDF_BUILTIN

  return __builtin_roundf (x);

#else

  /* Use generic implementation.  */

  int32_t i0, j0;

  GET_FLOAT_WORD (i0, x);

  j0 = ((i0 >> 23) & 0xff) - 0x7f;

  if (j0 < 23)

    {

      if (j0 < 0)

	{

	  i0 &= 0x80000000;

	  if (j0 == -1)

	    i0 |= 0x3f800000;

	}

      else

	{

	  uint32_t i = 0x007fffff >> j0;

	  if ((i0 & i) == 0)

	    /* X is integral.  */

	    return x;

	  i0 += 0x00400000 >> j0;

	  i0 &= ~i;

	}

    }

  else

    {

      if (j0 == 0x80)

	/* Inf or NaN.  */

	return x + x;

      else

	return x;

    }

  SET_FLOAT_WORD (x, i0);

  return x;

#endif /* ! USE_ROUNDF_BUILTIN  */

}

libm_alias_float (__round, round)