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 fmin = __fmin
31
32 /*
33 * fmin(x,y) returns the smaller of x and y. If just one of the
34 * arguments is NaN, fmin returns the other argument. If both
35 * arguments are NaN, fmin returns NaN.
36 *
37 * See fmaxf.c for a discussion of implementation trade-offs.
38 */
39
40 #include "libm.h" /* for islessequal macro */
41
42 #include "fenv_inlines.h"
43 #include <stdio.h>
44 #include <sys/isa_defs.h>
45
46 double
__fmin(double x,double y)47 __fmin(double x, double y) {
48 union {
49 unsigned i[2];
50 double d;
51 } xx, yy;
52 unsigned s;
53
54 /* if y is nan, replace it by x */
55 if (y != y)
56 y = x;
57
58 /* if x is nan, replace it by y */
59 if (x != x)
60 x = y;
61
62 /* At this point, x and y are either both numeric, or both NaN */
63 if (!isnan(x) && !islessequal(x, y))
64 x = y;
65
66 /*
67 * set the sign of the result if either x or y has its sign set
68 */
69 xx.d = x;
70 yy.d = y;
71 #if defined(_BIG_ENDIAN)
72 s = (xx.i[0] | yy.i[0]) & 0x80000000;
73 xx.i[0] |= s;
74 #else
75 s = (xx.i[1] | yy.i[1]) & 0x80000000;
76 xx.i[1] |= s;
77 #endif
78
79 return (xx.d);
80 }
81