xref: /illumos-gate/usr/src/lib/libm/common/complex/cprojl.c (revision 45ede40b2394db7967e59f19288fae9b62efd4aa)
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 (the "License").
6  * You may not use this file except in compliance with the License.
7  *
8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9  * or http://www.opensolaris.org/os/licensing.
10  * See the License for the specific language governing permissions
11  * and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL HEADER in each
14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15  * If applicable, add the following below this CDDL HEADER, with the
16  * fields enclosed by brackets "[]" replaced with your own identifying
17  * information: Portions Copyright [yyyy] [name of copyright owner]
18  *
19  * CDDL HEADER END
20  */
21 
22 /*
23  * Copyright 2011 Nexenta Systems, Inc.  All rights reserved.
24  */
25 /*
26  * Copyright 2006 Sun Microsystems, Inc.  All rights reserved.
27  * Use is subject to license terms.
28  */
29 
30 #pragma weak __cprojl = cprojl
31 
32 #include "libm.h"		/* fabsl */
33 #include "complex_wrapper.h"
34 #include "longdouble.h"
35 
36 /* INDENT OFF */
37 static const long double zero = 0.0L;
38 /* INDENT ON */
39 
40 ldcomplex
41 cprojl(ldcomplex z) {
42 	long double x, y;
43 	int hy;
44 
45 	x = LD_RE(z);
46 	y = LD_IM(z);
47 #if defined(__x86)
48 	hy = ((int *) &y)[2] << 16;
49 #else
50 	hy = ((int *) &y)[0];
51 #endif
52 	if (isinfl(y)) {
53 		LD_RE(z) = fabsl(y);
54 		LD_IM(z) = hy >= 0 ? zero : -zero;
55 	} else if (isinfl(x)) {
56 		LD_RE(z) = fabsl(x);
57 		LD_IM(z) = hy >= 0 ? zero : -zero;
58 	}
59 	return (z);
60 }
61