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 /*
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 __csqrtf = csqrtf
31
32 #include "libm.h" /* sqrt/fabsf/sqrtf */
33 #include "complex_wrapper.h"
34
35 /* INDENT OFF */
36 static const float zero = 0.0F;
37 /* INDENT ON */
38
39 fcomplex
csqrtf(fcomplex z)40 csqrtf(fcomplex z) {
41 fcomplex ans;
42 double dt, dx, dy;
43 float x, y, t, ax, ay, w;
44 int ix, iy, hx, hy;
45
46 x = F_RE(z);
47 y = F_IM(z);
48 hx = THE_WORD(x);
49 hy = THE_WORD(y);
50 ix = hx & 0x7fffffff;
51 iy = hy & 0x7fffffff;
52 ay = fabsf(y);
53 ax = fabsf(x);
54 if (ix >= 0x7f800000 || iy >= 0x7f800000) {
55 /* x or y is Inf or NaN */
56 if (iy == 0x7f800000)
57 F_IM(ans) = F_RE(ans) = ay;
58 else if (ix == 0x7f800000) {
59 if (hx > 0) {
60 F_RE(ans) = ax;
61 F_IM(ans) = ay * zero;
62 } else {
63 F_RE(ans) = ay * zero;
64 F_IM(ans) = ax;
65 }
66 } else
67 F_IM(ans) = F_RE(ans) = ax + ay;
68 } else if (iy == 0) {
69 if (hx >= 0) {
70 F_RE(ans) = sqrtf(ax);
71 F_IM(ans) = zero;
72 } else {
73 F_IM(ans) = sqrtf(ax);
74 F_RE(ans) = zero;
75 }
76 } else {
77 dx = (double) ax;
78 dy = (double) ay;
79 dt = sqrt(0.5 * (sqrt(dx * dx + dy * dy) + dx));
80 t = (float) dt;
81 w = (float) (dy / (dt + dt));
82 if (hx >= 0) {
83 F_RE(ans) = t;
84 F_IM(ans) = w;
85 } else {
86 F_IM(ans) = t;
87 F_RE(ans) = w;
88 }
89 }
90 if (hy < 0)
91 F_IM(ans) = -F_IM(ans);
92 return (ans);
93 }
94