log.hpp

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// SPDX-License-Identifier: BSL-1.0
 
#ifndef TETL_CMATH_LOG_HPP
#define TETL_CMATH_LOG_HPP
 
#include <etl/_config/all.hpp>
 
#include <etl/_3rd_party/gcem/gcem.hpp>
#include <etl/_concepts/integral.hpp>
#include <etl/_type_traits/is_constant_evaluated.hpp>
 
namespace etl {
 
namespace detail {
 
inline constexpr struct log {
    template <typename Float>
    [[nodiscard]] constexpr auto operator()(Float v) const noexcept -> Float
    {
        if (not is_constant_evaluated()) {
#if __has_builtin(__builtin_logf)
            if constexpr (is_same_v<Float, float>) {
                return __builtin_logf(v);
            }
#endif
#if __has_builtin(__builtin_log)
            if constexpr (is_same_v<Float, double>) {
                return __builtin_log(v);
            }
#endif
        }
 
        return etl::detail::gcem::log(v);
    }
} log;
 
} // namespace detail


[[nodiscard]] constexpr auto log(float v) noexcept -> float { return etl::detail::log(v); }
[[nodiscard]] constexpr auto logf(float v) noexcept -> float { return etl::detail::log(v); }
[[nodiscard]] constexpr auto log(double v) noexcept -> double { return etl::detail::log(v); }
[[nodiscard]] constexpr auto log(long double v) noexcept -> long double { return etl::detail::log(v); }
[[nodiscard]] constexpr auto logl(long double v) noexcept -> long double { return etl::detail::log(v); }
[[nodiscard]] constexpr auto log(integral auto arg) noexcept -> double { return etl::detail::log(double(arg)); }

 
} // namespace etl
 
#endif // TETL_CMATH_LOG_HPP