2 * Conversion from s_nextafter.c by Ulrich Drepper, Cygnus Support,
3 * drepper@cygnus.com and Jakub Jelinek, jj@ultra.linux.cz.
7 * ====================================================
8 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
10 * Developed at SunPro, a Sun Microsystems, Inc. business.
11 * Permission to use, copy, modify, and distribute this
12 * software is freely granted, provided that this notice
14 * ====================================================
17 #if defined(LIBM_SCCS) && !defined(lint)
18 static char rcsid
[] = "$NetBSD: $";
23 * return the next machine floating-point number of x in the
30 #include <math-barriers.h>
31 #include <math_private.h>
32 #include <math_ldbl_opt.h>
35 double __nexttoward(double x
, long double y
)
42 EXTRACT_WORDS(hx
,lx
,x
);
44 EXTRACT_WORDS64(hy
,yhi
);
45 ix
= hx
&0x7fffffff; /* |x| */
46 iy
= hy
&0x7fffffffffffffffLL
; /* |y| */
48 if(((ix
>=0x7ff00000)&&((ix
-0x7ff00000)|lx
)!=0) || /* x is nan */
49 iy
>0x7ff0000000000000LL
) /* y is nan */
51 if((long double) x
==y
) return y
; /* x=y, return y */
52 if((ix
|lx
)==0) { /* x == 0 */
54 INSERT_WORDS(x
,(uint32_t)((hy
>>32)&0x80000000),1);/* return +-minsub */
55 u
= math_opt_barrier (x
);
57 math_force_eval (u
); /* raise underflow flag */
60 if(hx
>=0) { /* x > 0 */
61 if (x
> y
) { /* x > 0 */
64 } else { /* x < y, x += ulp */
69 if (x
< y
) { /* x < 0 */
72 } else { /* x > y, x += ulp */
79 double u
= x
+x
; /* overflow */
84 double u
= x
*x
; /* underflow */
85 math_force_eval (u
); /* raise underflow flag */
88 INSERT_WORDS(x
,hx
,lx
);
91 long_double_symbol (libm
, __nexttoward
, nexttoward
);