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
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16#ifndef lint
17static char rcsid[] = "$FreeBSD: head/lib/msun/src/s_ceilf.c 97413 2002-05-28 18:15:04Z alfred $";
18#endif
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16#include <sys/cdefs.h>
17__FBSDID("$FreeBSD: head/lib/msun/src/s_ceilf.c 176451 2008-02-22 02:30:36Z das $"); |
18
19#include "math.h"
20#include "math_private.h"
21
22static const float huge = 1.0e30;
23
24float
25ceilf(float x)
26{
27 int32_t i0,j0;
28 u_int32_t i;
29
30 GET_FLOAT_WORD(i0,x);
31 j0 = ((i0>>23)&0xff)-0x7f;
32 if(j0<23) {
33 if(j0<0) { /* raise inexact if x != 0 */
34 if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
35 if(i0<0) {i0=0x80000000;}
36 else if(i0!=0) { i0=0x3f800000;}
37 }
38 } else {
39 i = (0x007fffff)>>j0;
40 if((i0&i)==0) return x; /* x is integral */
41 if(huge+x>(float)0.0) { /* raise inexact flag */
42 if(i0>0) i0 += (0x00800000)>>j0;
43 i0 &= (~i);
44 }
45 }
46 } else {
47 if(j0==0x80) return x+x; /* inf or NaN */
48 else return x; /* x is integral */
49 }
50 SET_FLOAT_WORD(x,i0);
51 return x;
52}
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