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#ifndef lint
17static char rcsid[] = "$FreeBSD: src/lib/msun/src/s_ceilf.c,v 1.7 2002/05/28 18:15:04 alfred Exp $";
18#endif
19
20#include "math.h"
21#include "math_private.h"
22
23static const float huge = 1.0e30;
24
25float
26ceilf(float x)
27{
28	int32_t i0,j0;
29	u_int32_t i;
30
31	GET_FLOAT_WORD(i0,x);
32	j0 = ((i0>>23)&0xff)-0x7f;
33	if(j0<23) {
34	    if(j0<0) { 	/* raise inexact if x != 0 */
35		if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
36		    if(i0<0) {i0=0x80000000;}
37		    else if(i0!=0) { i0=0x3f800000;}
38		}
39	    } else {
40		i = (0x007fffff)>>j0;
41		if((i0&i)==0) return x; /* x is integral */
42		if(huge+x>(float)0.0) {	/* raise inexact flag */
43		    if(i0>0) i0 += (0x00800000)>>j0;
44		    i0 &= (~i);
45		}
46	    }
47	} else {
48	    if(j0==0x80) return x+x;	/* inf or NaN */
49	    else return x;		/* x is integral */
50	}
51	SET_FLOAT_WORD(x,i0);
52	return x;
53}
54