GCC Code Coverage Report


Directory: include/polyfloat/
File: include/polyfloat/module/math/lpnorm.hpp
Date: 2026-11-09 15:28:50
Exec Total Coverage
Lines: 10 10 100.0%
Functions: 54 54 100.0%
Branches: 0 0 -%

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/math/pow_abs.hpp>
15 #include <polyfloat/module/core/maxmag.hpp>
16
17 namespace plf
18 {
19
20 template<typename Options>
21 struct lpnorm_t : eve::strict_tuple_callable<lpnorm_t, Options, raw_option, pedantic_option>
22 {
23 template<typename... Ts> struct result : as_polyfloat_like<Ts...>
24 {
25 };
26
27 template<concepts::polyfloat_like... Ts>
28 requires(eve::same_lanes_or_scalar<Ts...>)
29 52 POLYFLOAT_ABI typename result<Ts...>::type constexpr operator()(Ts... ts) const noexcept
30 {
31 52 return POLYFLOAT_CALL(ts...);
32 }
33
34 template<eve::non_empty_product_type Tup>
35 requires(eve::same_lanes_or_scalar_tuple<Tup> && !concepts::polyfloat_like<Tup>)
36 POLYFLOAT_ABI constexpr kumi::apply_traits_t<result, Tup> operator()(Tup const& t) const noexcept
37 requires(kumi::size_v<Tup> >= 1)
38 {
39 return POLYFLOAT_CALL(t);
40 }
41
42 52 POLYFLOAT_CALLABLE_OBJECT(lpnorm_t, lpnorm_);
43 };
44 //======================================================================================================================
45 //! @addtogroup math
46 //! @{
47 //! @var lpnorm
48 //! @brief object computing the lpnorm operation \f$ \left(\sum_{i = 0}^n |x_i|^p\right)^{\frac1p} \f$.
49 //!
50 //!
51 //! @groupheader{Header file}
52 //!
53 //! @code
54 //! #include <polyfloat/core.hpp>
55 //! @endcode
56 //!
57 //! @groupheader{Callable Signatures}
58 //!
59 //! @code
60 //! namespace polyfloat
61 //! {
62 //! template<polyfloat::concepts::polyfloat_like Z, polyfloat_like ... Zs> constexpr auto lpnorm(Z z, Zs... zs) noexcept;
63 //! }
64 //! @endcode
65 //!
66 //! **Parameters**
67 //!
68 //! * `z, zs...`: Values to process.
69 //!
70 //! **Return value**
71 //!
72 //! Returns the sum of the arguments.
73 //!
74 //! @groupheader{Example}
75 //!
76 //! @godbolt{doc/math/lpnorm.cpp}
77 //======================================================================================================================
78
79 inline constexpr auto lpnorm = eve::functor<lpnorm_t>;
80 //======================================================================================================================
81 //! @}
82 //======================================================================================================================
83 }
84
85 namespace plf::_
86 {
87 template<typename T0, eve::callable_options O> constexpr auto lpnorm_(POLYFLOAT_DELAY(), O const&, T0 t0) noexcept
88 {
89 return plf::abs(t0);
90 }
91
92 template<typename P, typename... Ts, eve::callable_options O>
93 52 constexpr auto lpnorm_(POLYFLOAT_DELAY(), O const& o, P const& p, Ts... ts) noexcept
94 {
95 using r_t = as_polyfloat_like_t<P, Ts...>;
96 // using u_t = eve::underlying_type_t<r_t>;
97 using e_t = eve::element_type_t<r_t>;
98 74 auto cvt = [](auto a) { return plf::convert(a, eve::as<e_t>()); };
99 52 r_t rp(p);
100 52 auto e = -eve::maxmag(plf::if_else(plf::is_nan(ts), zero, eve::exponent(hi(ts)))...);
101 126 auto f = [&](auto a) { return plf::pow_abs(plf::ldexp[eve::pedantic](cvt(a), e), rp); };
102 52 r_t that = plf::add[o](f(ts)...);
103 52 return plf::ldexp[eve::pedantic](plf::pow_abs(that, plf::rec[eve::pedantic](rp)), -e);
104 }
105 }
106