2 * Copyright (c) 2005 Bruce D. Evans and Steven G. Kargl
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice unmodified, this list of conditions, and the following
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 * $FreeBSD: head/lib/msun/src/s_ccoshf.c 226599 2011-10-21 06:29:32Z das $
30 * Hyperbolic cosine of a complex argument. See s_ccosh.c for details.
36 #include "math_private.h"
38 static const float huge = 0x1p127;
41 ccoshf(float complex z)
44 int32_t hx, hy, ix, iy;
49 GET_FLOAT_WORD(hx, x);
50 GET_FLOAT_WORD(hy, y);
55 if (ix < 0x7f800000 && iy < 0x7f800000) {
57 return (cpackf(coshf(x), x * y));
58 if (ix < 0x41100000) /* small x: normal case */
59 return (cpackf(coshf(x) * cosf(y), sinhf(x) * sinf(y)));
61 /* |x| >= 9, so cosh(x) ~= exp(|x|) */
62 if (ix < 0x42b17218) {
63 /* x < 88.7: expf(|x|) won't overflow */
64 h = expf(fabsf(x)) * 0.5f;
65 return (cpackf(h * cosf(y), copysignf(h, x) * sinf(y)));
66 } else if (ix < 0x4340b1e7) {
67 /* x < 192.7: scale to avoid overflow */
68 z = __ldexp_cexpf(cpackf(fabsf(x), y), -1);
69 return (cpackf(crealf(z), cimagf(z) * copysignf(1, x)));
71 /* x >= 192.7: the result always overflows */
73 return (cpackf(h * h * cosf(y), h * sinf(y)));
77 if (ix == 0 && iy >= 0x7f800000)
78 return (cpackf(y - y, copysignf(0, x * (y - y))));
80 if (iy == 0 && ix >= 0x7f800000) {
81 if ((hx & 0x7fffff) == 0)
82 return (cpackf(x * x, copysignf(0, x) * y));
83 return (cpackf(x * x, copysignf(0, (x + x) * y)));
86 if (ix < 0x7f800000 && iy >= 0x7f800000)
87 return (cpackf(y - y, x * (y - y)));
89 if (ix >= 0x7f800000 && (hx & 0x7fffff) == 0) {
91 return (cpackf(x * x, x * (y - y)));
92 return (cpackf((x * x) * cosf(y), x * sinf(y)));
95 return (cpackf((x * x) * (y - y), (x + x) * (y - y)));
99 ccosf(float complex z)
102 return (ccoshf(cpackf(-cimagf(z), crealf(z))));