fmax.hpp

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// SPDX-License-Identifier: BSL-1.0
// SPDX-FileCopyrightText: Copyright (C) 2021 Tobias Hienzsch
 
#ifndef TETL_CMATH_FMAX_HPP
#define TETL_CMATH_FMAX_HPP
 
#include <etl/_3rd_party/gcem/gcem.hpp>
#include <etl/_type_traits/is_constant_evaluated.hpp>
 
namespace etl {
 
namespace detail {
 
inline constexpr struct fmax {
    template <typename Float>
    [[nodiscard]] constexpr auto operator()(Float x, Float y) const noexcept -> Float
    {
        if (not is_constant_evaluated()) {
#if __has_builtin(__builtin_fmaxf)
            if constexpr (etl::same_as<Float, float>) {
                return __builtin_fmaxf(x, y);
            }
#endif
#if __has_builtin(__builtin_fmax)
            if constexpr (etl::same_as<Float, double>) {
                return __builtin_fmax(x, y);
            }
#endif
        }
        return etl::detail::gcem::max(x, y);
    }
} fmax;
 
} // namespace detail
 
/// \ingroup cmath
/// @{
 
/// Returns the larger of two floating point arguments, treating NaNs as
/// missing data (between a NaN and a numeric value, the numeric value is chosen)
///
/// https://en.cppreference.com/w/cpp/numeric/math/fmax
[[nodiscard]] constexpr auto fmax(float x, float y) noexcept -> float
{
    return etl::detail::fmax(x, y);
}
 
[[nodiscard]] constexpr auto fmaxf(float x, float y) noexcept -> float
{
    return etl::detail::fmax(x, y);
}
 
[[nodiscard]] constexpr auto fmax(double x, double y) noexcept -> double
{
    return etl::detail::fmax(x, y);
}
 
[[nodiscard]] constexpr auto fmax(long double x, long double y) noexcept -> long double
{
    return etl::detail::fmax(x, y);
}
 
[[nodiscard]] constexpr auto fmaxl(long double x, long double y) noexcept -> long double
{
    return etl::detail::fmax(x, y);
}
 
/// @}
 
} // namespace etl
 
#endif // TETL_CMATH_FMAX_HPP