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Editing: xsimd_generic_arithmetic.hpp

/***************************************************************************
 * Copyright (c) Johan Mabille, Sylvain Corlay, Wolf Vollprecht and         *
 * Martin Renou                                                             *
 * Copyright (c) QuantStack                                                 *
 * Copyright (c) Serge Guelton                                              *
 *                                                                          *
 * Distributed under the terms of the BSD 3-Clause License.                 *
 *                                                                          *
 * The full license is in the file LICENSE, distributed with this software. *
 ****************************************************************************/

#ifndef XSIMD_GENERIC_ARITHMETIC_HPP
#define XSIMD_GENERIC_ARITHMETIC_HPP

#include <complex>
#include <type_traits>

#include "./xsimd_generic_details.hpp"

namespace xsimd
{

namespace kernel
    {

using namespace types;

// bitwise_lshift
        template <class A, class T, class /*=typename std::enable_if<std::is_integral<T>::value, void>::type*/>
        inline batch<T, A> bitwise_lshift(batch<T, A> const& self, batch<T, A> const& other, requires_arch<generic>) noexcept
        {
            return detail::apply([](T x, T y) noexcept
                                 { return x << y; },
                                 self, other);
        }

// bitwise_rshift
        template <class A, class T, class /*=typename std::enable_if<std::is_integral<T>::value, void>::type*/>
        inline batch<T, A> bitwise_rshift(batch<T, A> const& self, batch<T, A> const& other, requires_arch<generic>) noexcept
        {
            return detail::apply([](T x, T y) noexcept
                                 { return x >> y; },
                                 self, other);
        }

// div
        template <class A, class T, class = typename std::enable_if<std::is_integral<T>::value, void>::type>
        inline batch<T, A> div(batch<T, A> const& self, batch<T, A> const& other, requires_arch<generic>) noexcept
        {
            return detail::apply([](T x, T y) noexcept -> T
                                 { return x / y; },
                                 self, other);
        }

// fma
        template <class A, class T>
        inline batch<T, A> fma(batch<T, A> const& x, batch<T, A> const& y, batch<T, A> const& z, requires_arch<generic>) noexcept
        {
            return x * y + z;
        }

template <class A, class T>
        inline batch<std::complex<T>, A> fma(batch<std::complex<T>, A> const& x, batch<std::complex<T>, A> const& y, batch<std::complex<T>, A> const& z, requires_arch<generic>) noexcept
        {
            auto res_r = fms(x.real(), y.real(), fms(x.imag(), y.imag(), z.real()));
            auto res_i = fma(x.real(), y.imag(), fma(x.imag(), y.real(), z.imag()));
            return { res_r, res_i };
        }

// fms
        template <class A, class T>
        inline batch<T, A> fms(batch<T, A> const& x, batch<T, A> const& y, batch<T, A> const& z, requires_arch<generic>) noexcept
        {
            return x * y - z;
        }

template <class A, class T>
        inline batch<std::complex<T>, A> fms(batch<std::complex<T>, A> const& x, batch<std::complex<T>, A> const& y, batch<std::complex<T>, A> const& z, requires_arch<generic>) noexcept
        {
            auto res_r = fms(x.real(), y.real(), fma(x.imag(), y.imag(), z.real()));
            auto res_i = fma(x.real(), y.imag(), fms(x.imag(), y.real(), z.imag()));
            return { res_r, res_i };
        }

// fnma
        template <class A, class T>
        inline batch<T, A> fnma(batch<T, A> const& x, batch<T, A> const& y, batch<T, A> const& z, requires_arch<generic>) noexcept
        {
            return -x * y + z;
        }

template <class A, class T>
        inline batch<std::complex<T>, A> fnma(batch<std::complex<T>, A> const& x, batch<std::complex<T>, A> const& y, batch<std::complex<T>, A> const& z, requires_arch<generic>) noexcept
        {
            auto res_r = -fms(x.real(), y.real(), fma(x.imag(), y.imag(), z.real()));
            auto res_i = -fma(x.real(), y.imag(), fms(x.imag(), y.real(), z.imag()));
            return { res_r, res_i };
        }

// fnms
        template <class A, class T>
        inline batch<T, A> fnms(batch<T, A> const& x, batch<T, A> const& y, batch<T, A> const& z, requires_arch<generic>) noexcept
        {
            return -x * y - z;
        }

template <class A, class T>
        inline batch<std::complex<T>, A> fnms(batch<std::complex<T>, A> const& x, batch<std::complex<T>, A> const& y, batch<std::complex<T>, A> const& z, requires_arch<generic>) noexcept
        {
            auto res_r = -fms(x.real(), y.real(), fms(x.imag(), y.imag(), z.real()));
            auto res_i = -fma(x.real(), y.imag(), fma(x.imag(), y.real(), z.imag()));
            return { res_r, res_i };
        }

// mul
        template <class A, class T, class /*=typename std::enable_if<std::is_integral<T>::value, void>::type*/>
        inline batch<T, A> mul(batch<T, A> const& self, batch<T, A> const& other, requires_arch<generic>) noexcept
        {
            return detail::apply([](T x, T y) noexcept -> T
                                 { return x * y; },
                                 self, other);
        }

}

#endif

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