1 /* s_nexttowardf.c -- float version of s_nextafter.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com
3 * 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: $";
22 #include <math_private.h>
23 #include <math_ldbl_opt.h>
27 float __nexttowardf(float x
, long double y
)
29 float __nexttowardf(x
,y
)
39 GET_LDOUBLE_WORDS64(hy
,ly
,y
);
40 ix
= hx
&0x7fffffff; /* |x| */
41 iy
= hy
&0x7fffffffffffffffLL
; /* |y| */
42 uly
= ly
&0x7fffffffffffffffLL
; /* |y| */
44 if((ix
>0x7f800000) || /* x is nan */
45 ((iy
>=0x7ff0000000000000LL
)&&((iy
-0x7ff0000000000000LL
)|uly
)!=0))
48 if((long double) x
==y
) return y
; /* x=y, return y */
49 if(ix
==0) { /* x == 0 */
51 SET_FLOAT_WORD(x
,(u_int32_t
)((hy
>>32)&0x80000000)|1);/* return +-minsub*/
52 u
= math_opt_barrier (x
);
54 math_force_eval (u
); /* raise underflow flag */
57 if(hx
>=0) { /* x > 0 */
58 if(hy
<0||(ix
>>23)>(iy
>>52)-0x380
59 || ((ix
>>23)==(iy
>>52)-0x380
60 && (ix
&0x7fffff)>((hy
>>29)&0x7fffff))) {/* x > y, x -= ulp */
62 } else { /* x < y, x += ulp */
66 if(hy
>=0||(ix
>>23)>(iy
>>52)-0x380
67 || ((ix
>>23)==(iy
>>52)-0x380
68 && (ix
&0x7fffff)>((hy
>>29)&0x7fffff))) {/* x < y, x -= ulp */
70 } else { /* x > y, x += ulp */
76 x
= x
+x
; /* overflow */
77 if (FLT_EVAL_METHOD
!= 0)
78 /* Force conversion to float. */
82 if(hy
<0x00800000) { /* underflow */
84 math_force_eval (u
); /* raise underflow flag */
89 long_double_symbol (libm
, __nexttowardf
, nexttowardf
);