1/* s_ceilf.c -- float version of s_ceil.c.
2 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
3 */
4
5/*
6 * ====================================================
7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
8 *
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
12 * is preserved.
13 * ====================================================
14 */
15
16#include <sys/cdefs.h>
17#if defined(LIBM_SCCS) && !defined(lint)
18__RCSID("$NetBSD: s_ceilf.c,v 1.7 2002/05/26 22:01:54 wiz Exp $");
19#endif
20
21#include "math.h"
22#include "math_private.h"
23
24static const float huge = 1.0e30;
25
26float
27ceilf(float x)
28{
29	int32_t i0,jj0;
30	u_int32_t i;
31
32	GET_FLOAT_WORD(i0,x);
33	jj0 = ((i0>>23)&0xff)-0x7f;
34	if(jj0<23) {
35	    if(jj0<0) { 	/* raise inexact if x != 0 */
36		if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
37		    if(i0<0) {i0=0x80000000;}
38		    else if(i0!=0) { i0=0x3f800000;}
39		}
40	    } else {
41		i = (0x007fffff)>>jj0;
42		if((i0&i)==0) return x; /* x is integral */
43		if(huge+x>(float)0.0) {	/* raise inexact flag */
44		    if(i0>0) i0 += (0x00800000)>>jj0;
45		    i0 &= (~i);
46		}
47	    }
48	} else {
49	    if(jj0==0x80) return x+x;	/* inf or NaN */
50	    else return x;		/* x is integral */
51	}
52	SET_FLOAT_WORD(x,i0);
53	return x;
54}
55