1 /* s_nextafterl.c -- long double version of s_nextafter.c.
2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz.
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
9 * Developed at SunPro, a Sun Microsystems, Inc. business.
10 * Permission to use, copy, modify, and distribute this
11 * software is freely granted, provided that this notice
13 * ====================================================
16 #if defined(LIBM_SCCS) && !defined(lint)
17 static char rcsid[] = "$NetBSD: $";
22 * return the next machine floating-point number of x in the
28 #include <math_private.h>
31 long double __nextafterl(long double x, long double y)
33 long double __nextafterl(x,y)
40 GET_LDOUBLE_WORDS64(hx,lx,x);
41 GET_LDOUBLE_WORDS64(hy,ly,y);
42 ix = hx&0x7fffffffffffffffLL; /* |x| */
43 iy = hy&0x7fffffffffffffffLL; /* |y| */
45 if(((ix>=0x7fff000000000000LL)&&((ix-0x7fff000000000000LL)|lx)!=0) || /* x is nan */
46 ((iy>=0x7fff000000000000LL)&&((iy-0x7fff000000000000LL)|ly)!=0)) /* y is nan */
48 if(x==y) return y; /* x=y, return y */
49 if((ix|lx)==0) { /* x == 0 */
51 SET_LDOUBLE_WORDS64(x,hy&0x8000000000000000ULL,1);/* return +-minsubnormal */
52 u = math_opt_barrier (x);
54 math_force_eval (u); /* raise underflow flag */
57 if(hx>=0) { /* x > 0 */
58 if(hx>hy||((hx==hy)&&(lx>ly))) { /* x > y, x -= ulp */
61 } else { /* x < y, x += ulp */
66 if(hy>=0||hx>hy||((hx==hy)&&(lx>ly))){/* x < y, x -= ulp */
69 } else { /* x > y, x += ulp */
74 hy = hx&0x7fff000000000000LL;
75 if(hy==0x7fff000000000000LL) return x+x;/* overflow */
77 long double u = x*x; /* underflow */
78 math_force_eval (u); /* raise underflow flag */
80 SET_LDOUBLE_WORDS64(x,hx,lx);
83 weak_alias (__nextafterl, nextafterl)
84 strong_alias (__nextafterl, __nexttowardl)
85 weak_alias (__nextafterl, nexttowardl)