/* s_nextafterl.c -- long double version of s_nextafter.c.

 * Special version for i387.

 * Conversion to long double by Ulrich Drepper,

 * Cygnus Support, 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.

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

 */

#if defined(LIBM_SCCS) && !defined(lint)

static char rcsid[] = "$NetBSD: $";

#endif

/* IEEE functions

 *	nextafterl(x,y)

 *	return the next machine floating-point number of x in the

 *	direction toward y.

 *   Special cases:

 */

#include <errno.h>

#include <math.h>

#include <math-barriers.h>

#include <math_private.h>

#include <libm-alias-ldouble.h>

long double __nextafterl(long double x, long double y)

{

	uint32_t hx,hy,ix,iy;

	uint32_t lx,ly;

	int32_t esx,esy;

	GET_LDOUBLE_WORDS(esx,hx,lx,x);

	GET_LDOUBLE_WORDS(esy,hy,ly,y);

	ix = esx&0x7fff;		/* |x| */

	iy = esy&0x7fff;		/* |y| */

	/* Intel's extended format has the normally implicit 1 explicit

	   present.  Sigh!  */

	if(((ix==0x7fff)&&(((hx&0x7fffffff)|lx)!=0)) ||   /* x is nan */

	   ((iy==0x7fff)&&(((hy&0x7fffffff)|ly)!=0)))     /* y is nan */

	   return x+y;

	if(x==y) return y;		/* x=y, return y */

	if((ix|hx|lx)==0) {			/* x == 0 */

	    long double u;

	    SET_LDOUBLE_WORDS(x,esy&0x8000,0,1);/* return +-minsubnormal */

	    u = math_opt_barrier (x);

	    u = u * u;

	    math_force_eval (u);		/* raise underflow flag */

	    return x;

	}

	if(esx>=0) {			/* x > 0 */

	    if(esx>esy||((esx==esy) && (hx>hy||((hx==hy)&&(lx>ly))))) {

	      /* x > y, x -= ulp */

		if(lx==0) {

		    if (hx <= 0x80000000) {

		      if (esx == 0) {

			--hx;

		      } else {

			esx -= 1;

			hx = hx - 1;

			if (esx > 0)

			  hx |= 0x80000000;

		      }

		    } else

		      hx -= 1;

		}

		lx -= 1;

	    } else {				/* x < y, x += ulp */

		lx += 1;

		if(lx==0) {

		    hx += 1;

		    if (hx==0 || (esx == 0 && hx == 0x80000000)) {

			esx += 1;

			hx |= 0x80000000;

		    }

		}

	    }

	} else {				/* x < 0 */

	    if(esy>=0||(esx>esy||((esx==esy)&&(hx>hy||((hx==hy)&&(lx>ly)))))){

	      /* x < y, x -= ulp */

		if(lx==0) {

		    if (hx <= 0x80000000 && esx != 0xffff8000) {

			esx -= 1;

			hx = hx - 1;

			if ((esx&0x7fff) > 0)

			  hx |= 0x80000000;

		    } else

		      hx -= 1;

		}

		lx -= 1;

	    } else {				/* x > y, x += ulp */

		lx += 1;

		if(lx==0) {

		    hx += 1;

		    if (hx==0 || (esx == 0xffff8000 && hx == 0x80000000)) {

			esx += 1;

			hx |= 0x80000000;

		    }

		}

	    }

	}

	esy = esx&0x7fff;

	if(esy==0x7fff) {

	    long double u = x + x;	/* overflow  */

	    math_force_eval (u);

	    __set_errno (ERANGE);

	}

	if(esy==0) {

	    long double u = x*x;		/* underflow */

	    math_force_eval (u);		/* raise underflow flag */

	    __set_errno (ERANGE);

	}

	SET_LDOUBLE_WORDS(x,esx,hx,lx);

	return x;

}

libm_alias_ldouble (__nextafter, nextafter)

strong_alias (__nextafterl, __nexttowardl)

weak_alias (__nextafterl, nexttowardl)