/* Copyright (C) 1996-2018 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

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

#include <math.h>

#include <get-rounding-mode.h>

#include <stdint.h>

#include <math-barriers.h>

#include <math_private.h>

#include <libm-alias-double.h>

# define IREG_SIZE 64

# ifdef __ILP32__

#  define OREG_SIZE 32

# else

#  define OREG_SIZE 64

# endif

# define IREGS "d"

#if OREG_SIZE == 32

# define OREGS "w"

#else

# define OREGS "x"

#endif

long int

__lrint (double x)

{

#if IREG_SIZE == 64 && OREG_SIZE == 32

  long int result;

  if (__builtin_fabs (x) > INT32_MAX)

    {

      /* Converting large values to a 32 bit int may cause the frintx/fcvtza

	 sequence to set both FE_INVALID and FE_INEXACT.  To avoid this

	 check the rounding mode and do a single instruction with the

	 appropriate rounding mode.  */

      switch (get_rounding_mode ())

	{

	case FE_TONEAREST:

	  asm volatile ("fcvtns" "\t%" OREGS "0, %" IREGS "1"

			: "=r" (result) : "w" (x));

	  break;

	case FE_UPWARD:

	  asm volatile ("fcvtps" "\t%" OREGS "0, %" IREGS "1"

			: "=r" (result) : "w" (x));

	  break;

	case FE_DOWNWARD:

	  asm volatile ("fcvtms" "\t%" OREGS "0, %" IREGS "1"

			: "=r" (result) : "w" (x));

	  break;

	case FE_TOWARDZERO:

	default:

	  asm volatile ("fcvtzs" "\t%" OREGS "0, %" IREGS "1"

			: "=r" (result) : "w" (x));

	}

      return result;

    }

#endif

  double r =  __builtin_rint (x);

  /* Prevent gcc from calling lrint directly when compiled with

     -fno-math-errno by inserting a barrier.  */

  math_opt_barrier (r);

  return r;

}

libm_alias_double (__lrint, lrint)