| /* | |
| * Copyright 2008-2013 NVIDIA Corporation | |
| * Copyright 2013 Filipe RNC Maia | |
| * | |
| * Licensed under the Apache License, Version 2.0 (the "License"); | |
| * you may not use this file except in compliance with the License. | |
| * You may obtain a copy of the License at | |
| * | |
| * http://www.apache.org/licenses/LICENSE-2.0 | |
| * | |
| * Unless required by applicable law or agreed to in writing, software | |
| * distributed under the License is distributed on an "AS IS" BASIS, | |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| * See the License for the specific language governing permissions and | |
| * limitations under the License. | |
| */ | |
| /*- | |
| * Copyright (c) 2011 David Schultz | |
| * All rights reserved. | |
| * | |
| * Redistribution and use in source and binary forms, with or without | |
| * modification, are permitted provided that the following conditions | |
| * are met: | |
| * 1. Redistributions of source code must retain the above copyright | |
| * notice unmodified, this list of conditions, and the following | |
| * disclaimer. | |
| * 2. Redistributions in binary form must reproduce the above copyright | |
| * notice, this list of conditions and the following disclaimer in the | |
| * documentation and/or other materials provided with the distribution. | |
| * | |
| * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
| * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES | |
| * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. | |
| * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, | |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT | |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF | |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| */ | |
| /* | |
| * Adapted from FreeBSD by Filipe Maia, filipe.c.maia@gmail.com: | |
| * freebsd/lib/msun/src/s_ctanhf.c | |
| */ | |
| /* | |
| * Hyperbolic tangent of a complex argument z. See ctanh.c for details. | |
| */ | |
| THRUST_NAMESPACE_BEGIN | |
| namespace detail{ | |
| namespace complex{ | |
| using thrust::complex; | |
| __host__ __device__ inline | |
| complex<float> ctanhf(const complex<float>& z){ | |
| float x, y; | |
| float t, beta, s, rho, denom; | |
| uint32_t hx, ix; | |
| x = z.real(); | |
| y = z.imag(); | |
| get_float_word(hx, x); | |
| ix = hx & 0x7fffffff; | |
| if (ix >= 0x7f800000) { | |
| if (ix & 0x7fffff) | |
| return (complex<float>(x, (y == 0.0f ? y : x * y))); | |
| set_float_word(x, hx - 0x40000000); | |
| return (complex<float>(x, | |
| copysignf(0, isinf(y) ? y : sinf(y) * cosf(y)))); | |
| } | |
| if (!isfinite(y)) | |
| return (complex<float>(y - y, y - y)); | |
| if (ix >= 0x41300000) { /* x >= 11 */ | |
| float exp_mx = expf(-fabsf(x)); | |
| return (complex<float>(copysignf(1.0f, x), | |
| 4.0f * sinf(y) * cosf(y) * exp_mx * exp_mx)); | |
| } | |
| t = tanf(y); | |
| beta = 1.0f + t * t; | |
| s = sinhf(x); | |
| rho = sqrtf(1.0f + s * s); | |
| denom = 1.0f + beta * s * s; | |
| return (complex<float>((beta * rho * s) / denom, t / denom)); | |
| } | |
| __host__ __device__ inline | |
| complex<float> ctanf(complex<float> z){ | |
| z = ctanhf(complex<float>(-z.imag(), z.real())); | |
| return (complex<float>(z.imag(), -z.real())); | |
| } | |
| } // namespace complex | |
| } // namespace detail | |
| template <> | |
| __host__ __device__ | |
| inline complex<float> tan(const complex<float>& z){ | |
| return detail::complex::ctanf(z); | |
| } | |
| template <> | |
| __host__ __device__ | |
| inline complex<float> tanh(const complex<float>& z){ | |
| return detail::complex::ctanhf(z); | |
| } | |
| THRUST_NAMESPACE_END | |