5261 libm should stop using synonyms.h 5298 fabs is 0-sized, confuses dis(1) and others Reviewed by: Josef 'Jeff' Sipek <jeffpc@josefsipek.net> Approved by: Gordon Ross <gwr@nexenta.com>

```
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 cacos = __cacos
31
32 /* INDENT OFF */
33 /*
34 * dcomplex cacos(dcomplex z);
35 *
36 * Alogrithm
37 * (based on T.E.Hull, Thomas F. Fairgrieve and Ping Tak Peter Tang's
38 * paper "Implementing the Complex Arcsine and Arccosine Functins Using
39 * Exception Handling", ACM TOMS, Vol 23, pp 299-335)
40 *
41 * The principal value of complex inverse cosine function cacos(z),
42 * where z = x+iy, can be defined by
43 *
44 * cacos(z) = acos(B) - i sign(y) log (A + sqrt(A*A-1)),
45 *
46 * where the log function is the natural log, and
47 * ____________ ____________
48 * 1 / 2 2 1 / 2 2
49 * A = --- / (x+1) + y + --- / (x-1) + y
50 * 2 \/ 2 \/
``` | ```
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 __cacos = cacos
31
32 /* INDENT OFF */
33 /*
34 * dcomplex cacos(dcomplex z);
35 *
36 * Alogrithm
37 * (based on T.E.Hull, Thomas F. Fairgrieve and Ping Tak Peter Tang's
38 * paper "Implementing the Complex Arcsine and Arccosine Functins Using
39 * Exception Handling", ACM TOMS, Vol 23, pp 299-335)
40 *
41 * The principal value of complex inverse cosine function cacos(z),
42 * where z = x+iy, can be defined by
43 *
44 * cacos(z) = acos(B) - i sign(y) log (A + sqrt(A*A-1)),
45 *
46 * where the log function is the natural log, and
47 * ____________ ____________
48 * 1 / 2 2 1 / 2 2
49 * A = --- / (x+1) + y + --- / (x-1) + y
50 * 2 \/ 2 \/
``` |