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 __cexpf = cexpf
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;
39
40 fcomplex
cexpf(fcomplex z)41 cexpf(fcomplex z) {
42 fcomplex ans;
43 float x, y, c, s;
44 double t;
45 int n, ix, iy, hx, hy;
46
47 x = F_RE(z);
48 y = F_IM(z);
49 hx = THE_WORD(x);
50 hy = THE_WORD(y);
51 ix = hx & 0x7fffffff;
52 iy = hy & 0x7fffffff;
53 if (iy == 0) { /* y = 0 */
54 F_RE(ans) = expf(x);
55 F_IM(ans) = y;
56 } else if (ix == 0x7f800000) { /* x is +-inf */
57 if (hx < 0) {
58 if (iy >= 0x7f800000) {
59 F_RE(ans) = zero;
60 F_IM(ans) = zero;
61 } else {
62 sincosf(y, &s, &c);
63 F_RE(ans) = zero * c;
64 F_IM(ans) = zero * s;
65 }
66 } else {
67 if (iy >= 0x7f800000) {
68 F_RE(ans) = x;
69 F_IM(ans) = y - y;
70 } else {
71 sincosf(y, &s, &c);
72 F_RE(ans) = x * c;
73 F_IM(ans) = x * s;
74 }
75 }
76 } else {
77 sincosf(y, &s, &c);
78 if (ix >= 0x42B171AA) { /* |x| > 88.722... ~ log(2**128) */
79 #if defined(__i386) && !defined(__amd64)
80 int rp = __swapRP(fp_extended);
81 #endif
82 t = __k_cexp(x, &n);
83 F_RE(ans) = (float)scalbn(t * (double)c, n);
84 F_IM(ans) = (float)scalbn(t * (double)s, n);
85 #if defined(__i386) && !defined(__amd64)
86 if (rp != fp_extended)
87 (void) __swapRP(rp);
88 #endif
89 } else {
90 t = expf(x);
91 F_RE(ans) = t * c;
92 F_IM(ans) = t * s;
93 }
94 }
95 return (ans);
96 }
97