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

 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.

 */

/*

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

 * 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 "quadmath-imp.h"

__float128

nextafterq (__float128 x, __float128 y)

{

        int64_t hx,hy,ix,iy;

        uint64_t lx,ly;

        GET_FLT128_WORDS64(hx,lx,x);

        GET_FLT128_WORDS64(hy,ly,y);

        ix = hx&0x7fffffffffffffffLL;           /* |x| */

        iy = hy&0x7fffffffffffffffLL;           /* |y| */

        if(((ix>=0x7fff000000000000LL)&&((ix-0x7fff000000000000LL)|lx)!=0) ||   /* x is nan */

           ((iy>=0x7fff000000000000LL)&&((iy-0x7fff000000000000LL)|ly)!=0))     /* y is nan */

           return x+y;

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

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

            SET_FLT128_WORDS64(x,hy&0x8000000000000000ULL,1);/* return +-minsubnormal */

            /* here we should raise an underflow flag */

            return x;

        }

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

            if(hx>hy||((hx==hy)&&(lx>ly))) {    /* x > y, x -= ulp */

                if(lx==0) hx--;

                lx--;

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

                lx++;

                if(lx==0) hx++;

            }

        } else {                                /* x < 0 */

            if(hy>=0||hx>hy||((hx==hy)&&(lx>ly))){/* x < y, x -= ulp */

                if(lx==0) hx--;

                lx--;

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

                lx++;

                if(lx==0) hx++;

            }

        }

        hy = hx&0x7fff000000000000LL;

        if(hy==0x7fff000000000000LL) return x+x;/* overflow  */

        if(hy==0) {

            /* here we should raise an underflow flag */

        }

        SET_FLT128_WORDS64(x,hx,lx);

        return x;

}