1 /*
2  * Copyright (c) 1998, 2001, Oracle and/or its affiliates. All rights reserved.
3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4  *
5  * This code is free software; you can redistribute it and/or modify it
6  * under the terms of the GNU General Public License version 2 only, as
7  * published by the Free Software Foundation.  Oracle designates this
8  * particular file as subject to the "Classpath" exception as provided
9  * by Oracle in the LICENSE file that accompanied this code.
10  *
11  * This code is distributed in the hope that it will be useful, but WITHOUT
12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14  * version 2 for more details (a copy is included in the LICENSE file that
15  * accompanied this code).
16  *
17  * You should have received a copy of the GNU General Public License version
18  * 2 along with this work; if not, write to the Free Software Foundation,
19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20  *
21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22  * or visit www.oracle.com if you need additional information or have any
23  * questions.
24  */
25 
26 /*
27  * __ieee754_scalb(x, fn) is provide for
28  * passing various standard test suite. One
29  * should use scalbn() instead.
30  */
31 
32 #include "fdlibm.h"
33 
34 #ifdef _SCALB_INT
35 #ifdef __STDC__
__ieee754_scalb(double x,int fn)36         double __ieee754_scalb(double x, int fn)
37 #else
38         double __ieee754_scalb(x,fn)
39         double x; int fn;
40 #endif
41 #else
42 #ifdef __STDC__
43         double __ieee754_scalb(double x, double fn)
44 #else
45         double __ieee754_scalb(x,fn)
46         double x, fn;
47 #endif
48 #endif
49 {
50 #ifdef _SCALB_INT
51         return scalbn(x,fn);
52 #else
53         if (isnan(x)||isnan(fn)) return x*fn;
54         if (!finite(fn)) {
55             if(fn>0.0) return x*fn;
56             else       return x/(-fn);
57         }
58         if (rint(fn)!=fn) return (fn-fn)/(fn-fn);
59         if ( fn > 65000.0) return scalbn(x, 65000);
60         if (-fn > 65000.0) return scalbn(x,-65000);
61         return scalbn(x,(int)fn);
62 #endif
63 }
64