heaviside.hpp

//*****************************************************************************
// Copyright (c) 2024-2025, Intel Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// - Redistributions of source code must retain the above copyright notice,
//   this list of conditions and the following disclaimer.
// - 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 COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER OR CONTRIBUTORS 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.
//*****************************************************************************
 
#pragma once
 
#include <sycl/sycl.hpp>
 
// dpctl tensor headers
#include "utils/math_utils.hpp"
#include "utils/type_utils.hpp"
 
namespace dpnp::kernels::heaviside
{
namespace mu_ns = dpctl::tensor::math_utils;
namespace tu_ns = dpctl::tensor::type_utils;
 
template <typename argT1, typename argT2, typename resT>
struct HeavisideFunctor
{
    using supports_sg_loadstore = std::negation<
        std::disjunction<tu_ns::is_complex<argT1>, tu_ns::is_complex<argT2>>>;
    using supports_vec = typename std::false_type;
 
    resT operator()(const argT1 &in1, const argT2 &in2) const
    {
        if (std::isnan(in1)) {
            return in1;
        }
        else if (in1 == 0) {
            return in2;
        }
        return resT(in1 > 0);
    }
};
} // namespace dpnp::kernels::heaviside