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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.
*/
#pragma once
#include <thrust/detail/config.h>
#if defined(_CCCL_IMPLICIT_SYSTEM_HEADER_GCC)
# pragma GCC system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_CLANG)
# pragma clang system_header
#elif defined(_CCCL_IMPLICIT_SYSTEM_HEADER_MSVC)
# pragma system_header
#endif // no system header
#include <math.h>
#include <cmath>
#include <thrust/detail/complex/math_private.h>
THRUST_NAMESPACE_BEGIN
namespace detail
{
namespace complex
{
// Define basic arithmetic functions so we can use them without explicit scope
// keeping the code as close as possible to FreeBSDs for ease of maintenance.
// It also provides an easy way to support compilers with missing C99 functions.
// When possible, just use the names in the global scope.
// Some platforms define these as macros, others as free functions.
// Avoid using the std:: form of these as nvcc may treat std::foo() as __host__ functions.
using ::log;
using ::acos;
using ::asin;
using ::sqrt;
using ::sinh;
using ::tan;
using ::cos;
using ::sin;
using ::exp;
using ::cosh;
using ::atan;
template <typename T>
inline __host__ __device__ T infinity();
template <>
inline __host__ __device__ float infinity<float>()
{
float res;
set_float_word(res, 0x7f800000);
return res;
}
template <>
inline __host__ __device__ double infinity<double>()
{
double res;
insert_words(res, 0x7ff00000,0);
return res;
}
#if defined _MSC_VER
__host__ __device__ inline int isinf(float x){
return std::abs(x) == infinity<float>();
}
__host__ __device__ inline int isinf(double x){
return std::abs(x) == infinity<double>();
}
__host__ __device__ inline int isnan(float x){
return x != x;
}
__host__ __device__ inline int isnan(double x){
return x != x;
}
__host__ __device__ inline int signbit(float x){
return ((*((uint32_t *)&x)) & 0x80000000) != 0 ? 1 : 0;
}
__host__ __device__ inline int signbit(double x){
return ((*((uint64_t *)&x)) & 0x8000000000000000) != 0ull ? 1 : 0;
}
__host__ __device__ inline int isfinite(float x){
return !isnan(x) && !isinf(x);
}
__host__ __device__ inline int isfinite(double x){
return !isnan(x) && !isinf(x);
}
#else
# if defined(__CUDACC__) && !(defined(__CUDA__) && defined(__clang__)) && !defined(_NVHPC_CUDA)
// NVCC implements at least some signature of these as functions not macros.
using ::isinf;
using ::isnan;
using ::signbit;
using ::isfinite;
# else
// Some compilers do not provide these in the global scope, because they are
// supposed to be macros. The versions in `std` are supposed to be functions.
// Since we're not compiling with nvcc, it's safe to use the functions in std::
using std::isinf;
using std::isnan;
using std::signbit;
using std::isfinite;
# endif // __CUDACC__
#endif // _MSC_VER
using ::atanh;
#if defined _MSC_VER
__host__ __device__ inline double copysign(double x, double y){
uint32_t hx,hy;
get_high_word(hx,x);
get_high_word(hy,y);
set_high_word(x,(hx&0x7fffffff)|(hy&0x80000000));
return x;
}
__host__ __device__ inline float copysignf(float x, float y){
uint32_t ix,iy;
get_float_word(ix,x);
get_float_word(iy,y);
set_float_word(x,(ix&0x7fffffff)|(iy&0x80000000));
return x;
}
#if !defined(__CUDACC__) && !defined(_NVHPC_CUDA)
// Simple approximation to log1p as Visual Studio is lacking one
inline double log1p(double x){
double u = 1.0+x;
if(u == 1.0){
return x;
}else{
if(u > 2.0){
// Use normal log for large arguments
return log(u);
}else{
return log(u)*(x/(u-1.0));
}
}
}
inline float log1pf(float x){
float u = 1.0f+x;
if(u == 1.0f){
return x;
}else{
if(u > 2.0f){
// Use normal log for large arguments
return logf(u);
}else{
return logf(u)*(x/(u-1.0f));
}
}
}
#if _MSV_VER <= 1500
#include <complex>
inline float hypotf(float x, float y){
return abs(std::complex<float>(x,y));
}
inline double hypot(double x, double y){
return _hypot(x,y);
}
#endif // _MSC_VER <= 1500
#endif // __CUDACC__
#endif // _MSC_VER
} // namespace complex
} // namespace detail
THRUST_NAMESPACE_END
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