/* 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(__builtin_expect(j0==0x80, 0)) 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)