/usr/include/thrust/detail/complex/ctanhf.h is in libthrust-dev 1.8.1-1.
This file is owned by root:root, with mode 0o644.
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* 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.
*/
#pragma once
#include <thrust/complex.h>
#include <thrust/detail/complex/math_private.h>
#include <cmath>
namespace thrust{
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);
}
} // namespace thrust
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