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Enable fast_int functionality for dynamic extent (#315)
Adds `fast_int` functionality to `cuco::extent`. Related to #284
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| /* | ||
| * Copyright (c) 2023, NVIDIA CORPORATION. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
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| #pragma once | ||
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| #include <cuco/detail/error.hpp> | ||
| #include <cuco/detail/prime.hpp> // TODO move to detail/extent/ | ||
| #include <cuco/detail/utils.hpp> | ||
| #include <cuco/utility/fast_int.cuh> | ||
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| #include <type_traits> | ||
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| namespace cuco { | ||
| namespace experimental { | ||
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| template <int32_t CGSize, int32_t WindowSize, typename SizeType, std::size_t N = dynamic_extent> | ||
| struct window_extent { | ||
| using value_type = SizeType; ///< Extent value type | ||
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| static auto constexpr cg_size = CGSize; | ||
| static auto constexpr window_size = WindowSize; | ||
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| __host__ __device__ constexpr value_type value() const noexcept { return N; } | ||
| __host__ __device__ explicit constexpr operator value_type() const noexcept { return value(); } | ||
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| private: | ||
| __host__ __device__ explicit constexpr window_extent() noexcept {} | ||
| __host__ __device__ explicit constexpr window_extent(SizeType) noexcept {} | ||
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| template <int32_t CGSize_, int32_t WindowSize_, typename SizeType_, std::size_t N_> | ||
| friend auto constexpr make_window_extent(extent<SizeType_, N_> ext); | ||
| }; | ||
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| template <int32_t CGSize, int32_t WindowSize, typename SizeType> | ||
| struct window_extent<CGSize, WindowSize, SizeType, dynamic_extent> | ||
| : cuco::utility::fast_int<SizeType> { | ||
| using value_type = | ||
| typename cuco::utility::fast_int<SizeType>::fast_int::value_type; ///< Extent value type | ||
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| static auto constexpr cg_size = CGSize; | ||
| static auto constexpr window_size = WindowSize; | ||
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| private: | ||
| using cuco::utility::fast_int<SizeType>::fast_int; | ||
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| template <int32_t CGSize_, int32_t WindowSize_, typename SizeType_, std::size_t N_> | ||
| friend auto constexpr make_window_extent(extent<SizeType_, N_> ext); | ||
| }; | ||
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| template <typename Container, typename SizeType, std::size_t N> | ||
| [[nodiscard]] auto constexpr make_window_extent(extent<SizeType, N> ext) | ||
| { | ||
| return make_window_extent<Container::cg_size, Container::window_size>(ext); | ||
| } | ||
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| template <typename Container> | ||
| [[nodiscard]] std::size_t constexpr make_window_extent(std::size_t size) | ||
| { | ||
| return make_window_extent<Container::cg_size, Container::window_size>(size); | ||
| } | ||
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| template <int32_t CGSize, int32_t WindowSize, typename SizeType, std::size_t N> | ||
| [[nodiscard]] auto constexpr make_window_extent(extent<SizeType, N> ext) | ||
| { | ||
| auto constexpr max_prime = cuco::detail::primes.back(); | ||
| auto constexpr max_value = | ||
| (static_cast<uint64_t>(std::numeric_limits<SizeType>::max()) < max_prime) | ||
| ? std::numeric_limits<SizeType>::max() | ||
| : static_cast<SizeType>(max_prime); | ||
| auto const size = SDIV(ext, CGSize * WindowSize); | ||
| if (size <= 0 or size > max_value) { CUCO_FAIL("Invalid input extent"); } | ||
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| if constexpr (N == dynamic_extent) { | ||
| return window_extent<CGSize, WindowSize, SizeType>{static_cast<SizeType>( | ||
| *cuco::detail::lower_bound( | ||
| cuco::detail::primes.begin(), cuco::detail::primes.end(), static_cast<uint64_t>(size)) * | ||
| CGSize)}; | ||
| } | ||
| if constexpr (N != dynamic_extent) { | ||
| return window_extent<CGSize, | ||
| WindowSize, | ||
| SizeType, | ||
| static_cast<std::size_t>( | ||
| *cuco::detail::lower_bound(cuco::detail::primes.begin(), | ||
| cuco::detail::primes.end(), | ||
| static_cast<uint64_t>(size)) * | ||
| CGSize)>{}; | ||
| } | ||
| } | ||
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| template <int32_t CGSize, int32_t WindowSize> | ||
| [[nodiscard]] std::size_t constexpr make_window_extent(std::size_t size) | ||
| { | ||
| return static_cast<std::size_t>(make_window_extent<CGSize, WindowSize>(extent{size})); | ||
| } | ||
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| namespace detail { | ||
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| template <typename...> | ||
| struct is_window_extent : std::false_type { | ||
| }; | ||
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| template <int32_t CGSize, int32_t WindowSize, typename SizeType, std::size_t N> | ||
| struct is_window_extent<window_extent<CGSize, WindowSize, SizeType, N>> : std::true_type { | ||
| }; | ||
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| template <typename T> | ||
| inline constexpr bool is_window_extent_v = is_window_extent<T>::value; | ||
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| } // namespace detail | ||
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| } // namespace experimental | ||
| } // namespace cuco |
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