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)