xref: /illumos-gate/usr/src/lib/libc/port/fp/floatundidf.c (revision a80670315ce377f65d0b82e01c8c0538cd176f39)
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 #include "quadint.h"
28 
29 #pragma weak __floatundidf = ___floatundidf
30 
31 /*
32  * Convert an unsigned longlong_t to a double-precision floating point value.
33  */
34 double
35 ___floatundidf(u_longlong_t a)
36 {
37 	union uu aa;
38 	double d;
39 
40 	aa.uq = a;
41 	d = aa.ul[H];
42 	d *= (1 << HALF_BITS);
43 	d *= (1 << HALF_BITS);
44 	d += aa.ul[L];
45 
46 	return (d);
47 }
48