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"
25 float __nexttowardf(float x
, long double y
)
27 float __nexttowardf(x
,y
)
37 GET_LDOUBLE_WORDS64(hy
,ly
,y
);
38 ix
= hx
&0x7fffffff; /* |x| */
39 iy
= hy
&0x7fffffffffffffffLL
; /* |y| */
41 if((ix
>0x7f800000) || /* x is nan */
42 ((iy
>=0x7fff000000000000LL
)&&((iy
-0x7fff000000000000LL
)|ly
)!=0))
45 if((long double) x
==y
) return y
; /* x=y, return y */
46 if(ix
==0) { /* x == 0 */
48 SET_FLOAT_WORD(x
,(u_int32_t
)((hy
>>32)&0x80000000)|1);/* return +-minsub*/
50 if(x2
==x
) return x2
; else return x
; /* raise underflow flag */
52 if(hx
>=0) { /* x > 0 */
53 if(hy
<0||(ix
>>23)>(iy
>>48)-0x3f80
54 || ((ix
>>23)==(iy
>>48)-0x3f80
55 && (ix
&0x7fffff)>((hy
>>25)&0x7fffff))) {/* x > y, x -= ulp */
57 } else { /* x < y, x += ulp */
61 if(hy
>=0||(ix
>>23)>(iy
>>48)-0x3f80
62 || ((ix
>>23)==(iy
>>48)-0x3f80
63 && (ix
&0x7fffff)>((hy
>>25)&0x7fffff))) {/* x < y, x -= ulp */
65 } else { /* x > y, x += ulp */
70 if(hy
>=0x7f800000) return x
+x
; /* overflow */
71 if(hy
<0x00800000) { /* underflow */
73 if(x2
!=x
) { /* raise underflow flag */
74 SET_FLOAT_WORD(x2
,hx
);
81 weak_alias (__nexttowardf
, nexttowardf
)