log10.hpp

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// SPDX-License-Identifier: BSL-1.0
 
#ifndef TETL_CMATH_LOG10_HPP
#define TETL_CMATH_LOG10_HPP
 
#include <etl/_config/all.hpp>
 
#include <etl/_3rd_party/gcem/gcem.hpp>
#include <etl/_concepts/integral.hpp>
#include <etl/_concepts/same_as.hpp>
#include <etl/_type_traits/is_constant_evaluated.hpp>
 
namespace etl {
 
namespace detail {
 
inline constexpr struct log10 {
    template <typename Float>
    [[nodiscard]] constexpr auto operator()(Float arg) const noexcept -> Float
    {
        if (not is_constant_evaluated()) {
#if __has_builtin(__builtin_log10f)
            if constexpr (etl::same_as<Float, float>) {
                return __builtin_log10f(arg);
            }
#endif
#if __has_builtin(__builtin_log10)
            if constexpr (etl::same_as<Float, double>) {
                return __builtin_log10(arg);
            }
#endif
        }
        return etl::detail::gcem::log(arg) / static_cast<Float>(GCEM_LOG_10);
    }
} log10;
 
} // namespace detail


[[nodiscard]] constexpr auto log10(float arg) noexcept -> float { return etl::detail::log10(arg); }
[[nodiscard]] constexpr auto log10f(float arg) noexcept -> float { return etl::log10(arg); }
[[nodiscard]] constexpr auto log10(double arg) noexcept -> double { return etl::detail::log10(arg); }
[[nodiscard]] constexpr auto log10(long double arg) noexcept -> long double { return etl::detail::log10(arg); }
[[nodiscard]] constexpr auto log10l(long double arg) noexcept -> long double { return etl::detail::log10(arg); }
[[nodiscard]] constexpr auto log10(integral auto arg) noexcept -> double { return etl::detail::log10(double(arg)); }

 
} // namespace etl
 
#endif // TETL_CMATH_LOG10_HPP