xref: /illumos-gate/usr/src/lib/libc/port/fp/floatdidf.c (revision 7c478bd95313f5f23a4c958a745db2134aa03244)
1 /*
2  * CDDL HEADER START
3  *
4  * The contents of this file are subject to the terms of the
5  * Common Development and Distribution License, Version 1.0 only
6  * (the "License").  You may not use this file except in compliance
7  * with the License.
8  *
9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10  * or http://www.opensolaris.org/os/licensing.
11  * See the License for the specific language governing permissions
12  * and limitations under the License.
13  *
14  * When distributing Covered Code, include this CDDL HEADER in each
15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16  * If applicable, add the following below this CDDL HEADER, with the
17  * fields enclosed by brackets "[]" replaced with your own identifying
18  * information: Portions Copyright [yyyy] [name of copyright owner]
19  *
20  * CDDL HEADER END
21  */
22 /*
23  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24  * Use is subject to license terms.
25  */
26 
27 #pragma ident	"%Z%%M%	%I%	%E% SMI"
28 
29 #include "quadint.h"
30 
31 #pragma weak __floatdidf = ___floatdidf
32 
33 /*
34  * Convert a longlong_t to a double-precision floating point value.
35  */
36 double
37 ___floatdidf(longlong_t a)
38 {
39 	union uu aa;
40 	double d;
41 
42 	aa.q = a;
43 	d = aa.sl[H];
44 	d *= (1 << HALF_BITS);
45 	d *= (1 << HALF_BITS);
46 	d += aa.ul[L];
47 
48 	return (d);
49 }
50