1 /* s_nextafterf.c -- float version of s_nextafter.c.
5 * ====================================================
6 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 * Developed at SunPro, a Sun Microsystems, Inc. business.
9 * Permission to use, copy, modify, and distribute this
10 * software is freely granted, provided that this notice
12 * ====================================================
15 #if defined(LIBM_SCCS) && !defined(lint)
16 static char rcsid
[] = "$NetBSD: s_nextafterf.c,v 1.4 1995/05/10 20:48:01 jtc Exp $";
21 #include <math-barriers.h>
22 #include <math_private.h>
23 #include <libm-alias-float.h>
26 float __nextafterf(float x
, float y
)
32 ix
= hx
&0x7fffffff; /* |x| */
33 iy
= hy
&0x7fffffff; /* |y| */
35 if((ix
>0x7f800000) || /* x is nan */
36 (iy
>0x7f800000)) /* y is nan */
38 if(x
==y
) return y
; /* x=y, return y */
39 if(ix
==0) { /* x == 0 */
41 SET_FLOAT_WORD(x
,(hy
&0x80000000)|1);/* return +-minsubnormal */
42 u
= math_opt_barrier (x
);
44 math_force_eval (u
); /* raise underflow flag */
47 if(hx
>=0) { /* x > 0 */
48 if(hx
>hy
) { /* x > y, x -= ulp */
50 } else { /* x < y, x += ulp */
54 if(hy
>=0||hx
>hy
){ /* x < y, x -= ulp */
56 } else { /* x > y, x += ulp */
62 float u
= x
+x
; /* overflow */
67 float u
= x
*x
; /* underflow */
68 math_force_eval (u
); /* raise underflow flag */
74 libm_alias_float (__nextafter
, nextafter
)