xref: /titanic_52/usr/src/lib/libc/port/fp/floatdidf.c (revision 7c478bd95313f5f23a4c958a745db2134aa03244)
1*7c478bd9Sstevel@tonic-gate /*
2*7c478bd9Sstevel@tonic-gate  * CDDL HEADER START
3*7c478bd9Sstevel@tonic-gate  *
4*7c478bd9Sstevel@tonic-gate  * The contents of this file are subject to the terms of the
5*7c478bd9Sstevel@tonic-gate  * Common Development and Distribution License, Version 1.0 only
6*7c478bd9Sstevel@tonic-gate  * (the "License").  You may not use this file except in compliance
7*7c478bd9Sstevel@tonic-gate  * with the License.
8*7c478bd9Sstevel@tonic-gate  *
9*7c478bd9Sstevel@tonic-gate  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
10*7c478bd9Sstevel@tonic-gate  * or http://www.opensolaris.org/os/licensing.
11*7c478bd9Sstevel@tonic-gate  * See the License for the specific language governing permissions
12*7c478bd9Sstevel@tonic-gate  * and limitations under the License.
13*7c478bd9Sstevel@tonic-gate  *
14*7c478bd9Sstevel@tonic-gate  * When distributing Covered Code, include this CDDL HEADER in each
15*7c478bd9Sstevel@tonic-gate  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
16*7c478bd9Sstevel@tonic-gate  * If applicable, add the following below this CDDL HEADER, with the
17*7c478bd9Sstevel@tonic-gate  * fields enclosed by brackets "[]" replaced with your own identifying
18*7c478bd9Sstevel@tonic-gate  * information: Portions Copyright [yyyy] [name of copyright owner]
19*7c478bd9Sstevel@tonic-gate  *
20*7c478bd9Sstevel@tonic-gate  * CDDL HEADER END
21*7c478bd9Sstevel@tonic-gate  */
22*7c478bd9Sstevel@tonic-gate /*
23*7c478bd9Sstevel@tonic-gate  * Copyright 2005 Sun Microsystems, Inc.  All rights reserved.
24*7c478bd9Sstevel@tonic-gate  * Use is subject to license terms.
25*7c478bd9Sstevel@tonic-gate  */
26*7c478bd9Sstevel@tonic-gate 
27*7c478bd9Sstevel@tonic-gate #pragma ident	"%Z%%M%	%I%	%E% SMI"
28*7c478bd9Sstevel@tonic-gate 
29*7c478bd9Sstevel@tonic-gate #include "quadint.h"
30*7c478bd9Sstevel@tonic-gate 
31*7c478bd9Sstevel@tonic-gate #pragma weak __floatdidf = ___floatdidf
32*7c478bd9Sstevel@tonic-gate 
33*7c478bd9Sstevel@tonic-gate /*
34*7c478bd9Sstevel@tonic-gate  * Convert a longlong_t to a double-precision floating point value.
35*7c478bd9Sstevel@tonic-gate  */
36*7c478bd9Sstevel@tonic-gate double
37*7c478bd9Sstevel@tonic-gate ___floatdidf(longlong_t a)
38*7c478bd9Sstevel@tonic-gate {
39*7c478bd9Sstevel@tonic-gate 	union uu aa;
40*7c478bd9Sstevel@tonic-gate 	double d;
41*7c478bd9Sstevel@tonic-gate 
42*7c478bd9Sstevel@tonic-gate 	aa.q = a;
43*7c478bd9Sstevel@tonic-gate 	d = aa.sl[H];
44*7c478bd9Sstevel@tonic-gate 	d *= (1 << HALF_BITS);
45*7c478bd9Sstevel@tonic-gate 	d *= (1 << HALF_BITS);
46*7c478bd9Sstevel@tonic-gate 	d += aa.ul[L];
47*7c478bd9Sstevel@tonic-gate 
48*7c478bd9Sstevel@tonic-gate 	return (d);
49*7c478bd9Sstevel@tonic-gate }
50