/[jscoverage]/trunk/js/src/fdlibm/s_ceil.c
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Annotation of /trunk/js/src/fdlibm/s_ceil.c

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Wed Aug 1 13:51:53 2007 UTC (14 years, 11 months ago) by siliconforks
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Initial import.

1 siliconforks 2 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2     *
3     * ***** BEGIN LICENSE BLOCK *****
4     * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5     *
6     * The contents of this file are subject to the Mozilla Public License Version
7     * 1.1 (the "License"); you may not use this file except in compliance with
8     * the License. You may obtain a copy of the License at
9     * http://www.mozilla.org/MPL/
10     *
11     * Software distributed under the License is distributed on an "AS IS" basis,
12     * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13     * for the specific language governing rights and limitations under the
14     * License.
15     *
16     * The Original Code is Mozilla Communicator client code, released
17     * March 31, 1998.
18     *
19     * The Initial Developer of the Original Code is
20     * Sun Microsystems, Inc.
21     * Portions created by the Initial Developer are Copyright (C) 1998
22     * the Initial Developer. All Rights Reserved.
23     *
24     * Contributor(s):
25     *
26     * Alternatively, the contents of this file may be used under the terms of
27     * either of the GNU General Public License Version 2 or later (the "GPL"),
28     * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29     * in which case the provisions of the GPL or the LGPL are applicable instead
30     * of those above. If you wish to allow use of your version of this file only
31     * under the terms of either the GPL or the LGPL, and not to allow others to
32     * use your version of this file under the terms of the MPL, indicate your
33     * decision by deleting the provisions above and replace them with the notice
34     * and other provisions required by the GPL or the LGPL. If you do not delete
35     * the provisions above, a recipient may use your version of this file under
36     * the terms of any one of the MPL, the GPL or the LGPL.
37     *
38     * ***** END LICENSE BLOCK ***** */
39    
40     /* @(#)s_ceil.c 1.3 95/01/18 */
41     /*
42     * ====================================================
43     * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
44     *
45     * Developed at SunSoft, a Sun Microsystems, Inc. business.
46     * Permission to use, copy, modify, and distribute this
47     * software is freely granted, provided that this notice
48     * is preserved.
49     * ====================================================
50     */
51    
52     /*
53     * ceil(x)
54     * Return x rounded toward -inf to integral value
55     * Method:
56     * Bit twiddling.
57     * Exception:
58     * Inexact flag raised if x not equal to ceil(x).
59     */
60    
61     #include "fdlibm.h"
62    
63     #ifdef __STDC__
64     static const double really_big = 1.0e300;
65     #else
66     static double really_big = 1.0e300;
67     #endif
68    
69     #ifdef __STDC__
70     double fd_ceil(double x)
71     #else
72     double fd_ceil(x)
73     double x;
74     #endif
75     {
76     fd_twoints u;
77     int i0,i1,j0;
78     unsigned i,j;
79     u.d = x;
80     i0 = __HI(u);
81     i1 = __LO(u);
82     j0 = ((i0>>20)&0x7ff)-0x3ff;
83     if(j0<20) {
84     if(j0<0) { /* raise inexact if x != 0 */
85     if(really_big+x>0.0) {/* return 0*sign(x) if |x|<1 */
86     if(i0<0) {i0=0x80000000;i1=0;}
87     else if((i0|i1)!=0) { i0=0x3ff00000;i1=0;}
88     }
89     } else {
90     i = (0x000fffff)>>j0;
91     if(((i0&i)|i1)==0) return x; /* x is integral */
92     if(really_big+x>0.0) { /* raise inexact flag */
93     if(i0>0) i0 += (0x00100000)>>j0;
94     i0 &= (~i); i1=0;
95     }
96     }
97     } else if (j0>51) {
98     if(j0==0x400) return x+x; /* inf or NaN */
99     else return x; /* x is integral */
100     } else {
101     i = ((unsigned)(0xffffffff))>>(j0-20);
102     if((i1&i)==0) return x; /* x is integral */
103     if(really_big+x>0.0) { /* raise inexact flag */
104     if(i0>0) {
105     if(j0==20) i0+=1;
106     else {
107     j = i1 + (1<<(52-j0));
108     if((int)j<i1) i0+=1; /* got a carry */
109     i1 = j;
110     }
111     }
112     i1 &= (~i);
113     }
114     }
115     u.d = x;
116     __HI(u) = i0;
117     __LO(u) = i1;
118     x = u.d;
119     return x;
120     }

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