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.
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.
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]
22 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
25 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
26 * Use is subject to license terms.
29 #pragma weak __nextafter = nextafter
30 #pragma weak _nextafter = nextafter
33 #include <float.h> /* DBL_MIN */
36 nextafter(double x
, double y
) {
40 volatile double dummy __unused
;
42 hx
= ((int *)&x
)[HIWORD
];
43 lx
= ((int *)&x
)[LOWORD
];
44 hy
= ((int *)&y
)[HIWORD
];
45 k
= (hx
& ~0x80000000) | lx
;
48 return (y
); /* C99 requirement */
51 if (k
== 0) { /* x = 0 */
53 ((int *)&ans
)[HIWORD
] = k
;
54 ((int *)&ans
)[LOWORD
] = 1;
57 ((int *)&ans
)[LOWORD
] = lx
- 1;
58 k
= (lx
== 0)? hx
- 1 : hx
;
59 ((int *)&ans
)[HIWORD
] = k
;
61 ((int *)&ans
)[LOWORD
] = lx
+ 1;
62 k
= (lx
== 0xffffffff)? hx
+ 1 : hx
;
63 ((int *)&ans
)[HIWORD
] = k
;
67 ((int *)&ans
)[LOWORD
] = lx
- 1;
68 k
= (lx
== 0)? hx
- 1 : hx
;
69 ((int *)&ans
)[HIWORD
] = k
;
71 ((int *)&ans
)[LOWORD
] = lx
+ 1;
72 k
= (lx
== 0xffffffff)? hx
+ 1 : hx
;
73 ((int *)&ans
)[HIWORD
] = k
;
76 k
= (k
>> 20) & 0x7ff;
79 return (_SVID_libm_err(x
, y
, 46));
82 dummy
= DBL_MIN
* copysign(DBL_MIN
, x
);