1 /* s_nextafterf.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: s_nextafterf.c,v 1.4 1995/05/10 20:48:01 jtc Exp $";
21 #include <math_private.h>
24 float __nextafterf(float x
, float y
)
30 ix
= hx
&0x7fffffff; /* |x| */
31 iy
= hy
&0x7fffffff; /* |y| */
33 if((ix
>0x7f800000) || /* x is nan */
34 (iy
>0x7f800000)) /* y is nan */
36 if(x
==y
) return y
; /* x=y, return y */
37 if(ix
==0) { /* x == 0 */
39 SET_FLOAT_WORD(x
,(hy
&0x80000000)|1);/* return +-minsubnormal */
40 u
= math_opt_barrier (x
);
42 math_force_eval (u
); /* raise underflow flag */
45 if(hx
>=0) { /* x > 0 */
46 if(hx
>hy
) { /* x > y, x -= ulp */
48 } else { /* x < y, x += ulp */
52 if(hy
>=0||hx
>hy
){ /* x < y, x -= ulp */
54 } else { /* x > y, x += ulp */
60 float u
= x
+x
; /* overflow */
64 float u
= x
*x
; /* underflow */
65 math_force_eval (u
); /* raise underflow flag */
70 weak_alias (__nextafterf
, nextafterf
)