1 /* s_nextafterf.c -- float version of s_nextafter.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
4 * $FreeBSD: src/lib/msun/src/s_nextafterf.c,v 1.5 1999/08/28 00:06:54 peter Exp $
5 * $DragonFly: src/lib/msun/src/Attic/s_nextafterf.c,v 1.3 2004/12/29 15:22:57 asmodai Exp $
9 * ====================================================
10 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
12 * Developed at SunPro, a Sun Microsystems, Inc. business.
13 * Permission to use, copy, modify, and distribute this
14 * software is freely granted, provided that this notice
16 * ====================================================
20 #include "math_private.h"
23 nextafterf(float x, float y)
29 ix = hx&0x7fffffff; /* |x| */
30 iy = hy&0x7fffffff; /* |y| */
32 if((ix>0x7f800000) || /* x is nan */
33 (iy>0x7f800000)) /* y is nan */
35 if(x==y) return x; /* x=y, return x */
36 if(ix==0) { /* x == 0 */
37 SET_FLOAT_WORD(x,(hy&0x80000000)|1);/* return +-minsubnormal */
39 if(y==x) return y; else return x; /* raise underflow flag */
41 if(hx>=0) { /* x > 0 */
42 if(hx>hy) { /* x > y, x -= ulp */
44 } else { /* x < y, x += ulp */
48 if(hy>=0||hx>hy){ /* x < y, x -= ulp */
50 } else { /* x > y, x += ulp */
55 if(hy>=0x7f800000) return x+x; /* overflow */
56 if(hy<0x00800000) { /* underflow */
58 if(y!=x) { /* raise underflow flag */