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 __ccoshf = ccoshf
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 static const float zero = 0.0F, half = 0.5F;
39
40 fcomplex
ccoshf(fcomplex z)41 ccoshf(fcomplex z) {
42 float t, x, y, S, C;
43 double w;
44 int hx, ix, hy, iy, n;
45 fcomplex ans;
46
47 x = F_RE(z);
48 y = F_IM(z);
49 hx = THE_WORD(x);
50 ix = hx & 0x7fffffff;
51 hy = THE_WORD(y);
52 iy = hy & 0x7fffffff;
53 x = fabsf(x);
54 y = fabsf(y);
55
56 sincosf(y, &S, &C);
57 if (ix >= 0x41600000) { /* |x| > 14 = prec/2 (14,28,34,60) */
58 if (ix >= 0x42B171AA) { /* |x| > 88.722... ~ log(2**128) */
59 if (ix >= 0x7f800000) { /* |x| is inf or NaN */
60 if (iy == 0) {
61 F_RE(ans) = x;
62 F_IM(ans) = y;
63 } else if (iy >= 0x7f800000) {
64 F_RE(ans) = x;
65 F_IM(ans) = x - y;
66 } else {
67 F_RE(ans) = C * x;
68 F_IM(ans) = S * x;
69 }
70 } else {
71 #if defined(__i386) && !defined(__amd64)
72 int rp = __swapRP(fp_extended);
73 #endif
74 /* return (C, S) * exp(x) / 2 */
75 w = __k_cexp((double)x, &n);
76 F_RE(ans) = (float)scalbn(C * w, n - 1);
77 F_IM(ans) = (float)scalbn(S * w, n - 1);
78 #if defined(__i386) && !defined(__amd64)
79 if (rp != fp_extended)
80 (void) __swapRP(rp);
81 #endif
82 }
83 } else {
84 t = expf(x) * half;
85 F_RE(ans) = C * t;
86 F_IM(ans) = S * t;
87 }
88 } else {
89 if (ix == 0) { /* x = 0, return (C,0) */
90 F_RE(ans) = C;
91 F_IM(ans) = zero;
92 } else {
93 F_RE(ans) = C * coshf(x);
94 F_IM(ans) = S * sinhf(x);
95 }
96 }
97 if ((hx ^ hy) < 0)
98 F_IM(ans) = -F_IM(ans);
99 return (ans);
100 }
101