/* s_rintf.c -- float version of s_rint.c.

 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.

 */

/* Adapted for use as nearbyint by Ulrich Drepper <drepper@cygnus.com>.  */

/*

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

 * 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.

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

 */

#include <fenv.h>

#include <math.h>

#include <math-barriers.h>

#include <math_private.h>

#include <libm-alias-float.h>

#include <math-use-builtins.h>

float

__nearbyintf (float x)

{

#if USE_NEARBYINTF_BUILTIN

  return __builtin_nearbyintf (x);

#else

  /* Use generic implementation.  */

  static const float

    TWO23[2] = {

		8.3886080000e+06, /* 0x4b000000 */

		-8.3886080000e+06, /* 0xcb000000 */

  };

  fenv_t env;

  int32_t i0, j0, sx;

  float w, t;

  GET_FLOAT_WORD (i0, x);

  sx = (i0 >> 31) & 1;

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

  if (j0 < 23)

    {

      if (j0 < 0)

	{

	  libc_feholdexceptf (&env;;

	  w = TWO23[sx] + math_opt_barrier (x);

	  t =  w - TWO23[sx];

	  math_force_eval (t);

	  libc_fesetenvf (&env;;

	  GET_FLOAT_WORD (i0, t);

	  SET_FLOAT_WORD (t, (i0 & 0x7fffffff) | (sx << 31));

	  return t;

	}

    }

  else

    {

      if (__glibc_unlikely (j0 == 0x80))

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

      else

	return x;		/* x is integral  */

  }

  libc_feholdexceptf (&env;;

  w = TWO23[sx] + math_opt_barrier (x);

  t = w - TWO23[sx];

  math_force_eval (t);

  libc_fesetenvf (&env;;

  return t;

#endif /* ! USE_NEARBYINT_BUILTIN  */

}

libm_alias_float (__nearbyint, nearbyint)