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 fdim = __fdim
31
32 /*
33 * fdim(x,y) returns x - y if x > y, +0 if x <= y, and NaN if x and
34 * y are unordered.
35 *
36 * fdim(x,y) raises overflow or inexact if x > y and x - y overflows
37 * or is inexact. It raises invalid if either operand is a signaling
38 * NaN. Otherwise, it raises no exceptions.
39 */
40
41 #include "libm.h" /* for islessequal macro */
42
43 double
__fdim(double x,double y)44 __fdim(double x, double y) {
45 if (islessequal(x, y)) {
46 x = 0.0;
47 y = -x;
48 }
49 return (x - y);
50 }
51