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 * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
23 */
24 /*
25 * Copyright 2005 Sun Microsystems, Inc. All rights reserved.
26 * Use is subject to license terms.
27 */
28
29 #pragma weak __clogf = clogf
30
31 #include "libm.h"
32 #include "complex_wrapper.h"
33
34 #if defined(__i386) && !defined(__amd64)
35 extern int __swapRP(int);
36 #endif
37
38 fcomplex
clogf(fcomplex z)39 clogf(fcomplex z) {
40 fcomplex ans;
41 float x, y, ax, ay;
42 double dx, dy;
43 int ix, iy, hx, hy;
44
45 x = F_RE(z);
46 y = F_IM(z);
47 hx = THE_WORD(x);
48 hy = THE_WORD(y);
49 ix = hx & 0x7fffffff;
50 iy = hy & 0x7fffffff;
51 ay = fabsf(y);
52 ax = fabsf(x);
53 F_IM(ans) = atan2f(y, x);
54 if (ix >= 0x7f800000 || iy >= 0x7f800000) {
55 /* x or y is Inf or NaN */
56 if (iy == 0x7f800000)
57 F_RE(ans) = ay;
58 else if (ix == 0x7f800000)
59 F_RE(ans) = ax;
60 else
61 F_RE(ans) = ax + ay;
62 } else {
63 #if defined(__i386) && !defined(__amd64)
64 int rp = __swapRP(fp_extended);
65 #endif
66 dx = (double)ax;
67 dy = (double)ay;
68 if (ix == 0x3f800000)
69 F_RE(ans) = (float)(0.5 * log1p(dy * dy));
70 else if (iy == 0x3f800000)
71 F_RE(ans) = (float)(0.5 * log1p(dx * dx));
72 else if ((ix | iy) == 0)
73 F_RE(ans) = -1.0f / ax;
74 else
75 F_RE(ans) = (float)(0.5 * log(dx * dx + dy * dy));
76 #if defined(__i386) && !defined(__amd64)
77 if (rp != fp_extended)
78 (void) __swapRP(rp);
79 #endif
80 }
81 return (ans);
82 }
83