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 fmaxl = __fmaxl
31
32 #include "libm.h" /* for isgreaterequal macro */
33
34 long double
__fmaxl(long double x,long double y)35 __fmaxl(long double x, long double y) {
36 union {
37 #if defined(__sparc)
38 unsigned i[4];
39 #elif defined(__x86)
40 unsigned i[3];
41 #else
42 #error Unknown architecture
43 #endif
44 long double ld;
45 } xx, yy;
46 unsigned s;
47
48 /* if y is nan, replace it by x */
49 if (y != y)
50 y = x;
51
52 /* if x is nan, replace it by y */
53 if (x != x)
54 x = y;
55
56 /* At this point, x and y are either both numeric, or both NaN */
57 if (!isnan(x) && !isgreaterequal(x, y))
58 x = y;
59
60 /*
61 * clear the sign of the result if either x or y has its sign clear
62 */
63 xx.ld = x;
64 yy.ld = y;
65 #if defined(__sparc)
66 s = ~(xx.i[0] & yy.i[0]) & 0x80000000;
67 xx.i[0] &= ~s;
68 #elif defined(__x86)
69 s = ~(xx.i[2] & yy.i[2]) & 0x8000;
70 xx.i[2] &= ~s;
71 #else
72 #error Unknown architecture
73 #endif
74
75 return (xx.ld);
76 }
77