| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | //====================================================================================================================== | ||
| 2 | /* | ||
| 3 | POLYFLOAT - Extended precision floating points | ||
| 4 | Copyright : POLYFLOAT Contributors & Maintainers | ||
| 5 | SPDX-License-Identifier: BSL-1.0 | ||
| 6 | */ | ||
| 7 | //====================================================================================================================== | ||
| 8 | #pragma once | ||
| 9 | |||
| 10 | #include <polyfloat/details/callable.hpp> | ||
| 11 | #include <polyfloat/types/concepts.hpp> | ||
| 12 | #include <polyfloat/types/traits.hpp> | ||
| 13 | #include <type_traits> | ||
| 14 | #include <polyfloat/module/core/minus.hpp> | ||
| 15 | #include <polyfloat/module/core/is_negative.hpp> | ||
| 16 | #include <polyfloat/module/math/exp.hpp> | ||
| 17 | |||
| 18 | namespace plf | ||
| 19 | { | ||
| 20 | |||
| 21 | template<typename Options> | ||
| 22 | struct log_t : plf::elementwise_callable<log_t, eve::log_t, Options, raw_option, pedantic_option> | ||
| 23 | { | ||
| 24 | 2474 | template<concepts::polyfloat_like Z> POLYFLOAT_ABI constexpr Z operator()(Z z) const noexcept | |
| 25 | { | ||
| 26 | 2474 | return POLYFLOAT_CALL(z); | |
| 27 | } | ||
| 28 | |||
| 29 | 2464 | POLYFLOAT_CALLABLE_OBJECT(log_t, log_); | |
| 30 | }; | ||
| 31 | //====================================================================================================================== | ||
| 32 | //! @addtogroup math | ||
| 33 | //! @{ | ||
| 34 | //! @var log | ||
| 35 | //! @brief return the natural logarithm value. | ||
| 36 | //! | ||
| 37 | //! @groupheader{Header file} | ||
| 38 | //! | ||
| 39 | //! @code | ||
| 40 | //! #include <polyfloat/core.hpp> | ||
| 41 | //! @endcode | ||
| 42 | //! | ||
| 43 | //! @groupheader{Callable Signatures} | ||
| 44 | //! | ||
| 45 | //! @code | ||
| 46 | //! namespace polyfloat | ||
| 47 | //! { | ||
| 48 | //! template<polyfloat::concepts::polyfloat_like T> constexpr auto log(T z) noexcept; | ||
| 49 | //! } | ||
| 50 | //! @endcode | ||
| 51 | //! | ||
| 52 | //! **Parameters** | ||
| 53 | //! | ||
| 54 | //! * `z`: Value to process. | ||
| 55 | //! | ||
| 56 | //! **Return value** | ||
| 57 | //! | ||
| 58 | //! Returns the expolute,natural logarithm of z. | ||
| 59 | //! | ||
| 60 | //! @groupheader{Example} | ||
| 61 | //! | ||
| 62 | //! @godbolt{doc/math/log.cpp} | ||
| 63 | //====================================================================================================================== | ||
| 64 | |||
| 65 | inline constexpr auto log = eve::functor<log_t>; | ||
| 66 | //====================================================================================================================== | ||
| 67 | //! @} | ||
| 68 | //====================================================================================================================== | ||
| 69 | } | ||
| 70 | |||
| 71 | namespace plf::_ | ||
| 72 | { | ||
| 73 | |||
| 74 | 2462 | template<typename T, eve::callable_options O> constexpr auto log_(POLYFLOAT_DELAY(), O const&, T xx) noexcept | |
| 75 | { | ||
| 76 | 2462 | T r(eve::log[eve::pedantic](plf::hi(xx))); | |
| 77 | 2462 | auto ex = plf::exp[eve::pedantic](-r); | |
| 78 | 2462 | ex = if_else(eve::is_nan(ex), eve::zero, ex); | |
| 79 | 2462 | r -= plf::oneminus(xx * ex); | |
| 80 | if constexpr (dimension_v<T> == 3) | ||
| 81 | { | ||
| 82 | 1213 | r -= plf::oneminus(xx * plf::exp[pedantic](-r)); | |
| 83 | 1213 | r -= plf::oneminus(xx * plf::exp[pedantic](-r)); | |
| 84 | } | ||
| 85 | 2462 | r = if_else(is_ltz(xx) || is_nan(xx), eve::nan, r); | |
| 86 | 2462 | r = if_else(is_infinite(xx), plf::inf(as(xx)), r); | |
| 87 | 2462 | r = if_else(is_eqz(xx), plf::minf(as(xx)), r); | |
| 88 | 2462 | return r; | |
| 89 | } | ||
| 90 | } | ||
| 91 |