1 /* s_nexttowardf.c -- float version of s_nextafter.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
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: $";
21 #include <math_private.h>
25 float __nexttowardf(float x, long double y)
27 float __nexttowardf(x,y)
36 GET_LDOUBLE_WORDS(esy,hy,ly,y);
37 ix = hx&0x7fffffff; /* |x| */
38 iy = esy&0x7fff; /* |y| */
40 if((ix>0x7f800000) || /* x is nan */
41 (iy>=0x7fff&&((hy|ly)!=0))) /* y is nan */
43 if((long double) x==y) return y; /* x=y, return y */
44 if(ix==0) { /* x == 0 */
46 SET_FLOAT_WORD(x,((esy&0x8000)<<16)|1);/* return +-minsub*/
47 u = math_opt_barrier (x);
49 math_force_eval (u); /* raise underflow flag */
52 if(hx>=0) { /* x > 0 */
53 if(esy>=0x8000||((ix>>23)&0xff)>iy-0x3f80
54 || (((ix>>23)&0xff)==iy-0x3f80
55 && ((ix&0x7fffff)<<8)>(hy&0x7fffffff))) {/* x > y, x -= ulp */
57 } else { /* x < y, x += ulp */
61 if(esy<0x8000||((ix>>23)&0xff)>iy-0x3f80
62 || (((ix>>23)&0xff)==iy-0x3f80
63 && ((ix&0x7fffff)<<8)>(hy&0x7fffffff))) {/* x < y, x -= ulp */
65 } else { /* x > y, x += ulp */
71 x = x+x; /* overflow */
72 if (FLT_EVAL_METHOD != 0)
73 /* Force conversion to float. */
78 float u = x*x; /* underflow */
79 math_force_eval (u); /* raise underflow flag */
84 weak_alias (__nexttowardf, nexttowardf)