151 lines
4.9 KiB
C++
151 lines
4.9 KiB
C++
/***************************************************************************************************
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* Copyright (c) 2023 - 2023 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the copyright holder nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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**************************************************************************************************/
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#pragma once
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#include <cute/config.hpp>
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#include <cute/container/tuple.hpp>
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#include <cute/algorithm/tuple_algorithms.hpp>
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#include <cute/numeric/integral_constant.hpp>
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#include <cute/numeric/integer_sequence.hpp>
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namespace cute
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{
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// For slicing
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struct Underscore : Int<0> {};
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CUTE_INLINE_CONSTANT Underscore _;
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// Treat Underscore as an integral like integral_constant
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template <>
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struct is_integral<Underscore> : true_type {};
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template <class T>
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struct is_underscore : false_type {};
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template <>
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struct is_underscore<Underscore> : true_type {};
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// Tuple trait for detecting static member element
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template <class Tuple, class Elem, class Enable = void>
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struct has_elem : false_type {};
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template <class Elem>
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struct has_elem<Elem, Elem> : true_type {};
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template <class Tuple, class Elem>
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struct has_elem<Tuple, Elem, enable_if_t<is_tuple<Tuple>::value> >
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: has_elem<Tuple, Elem, tuple_seq<Tuple> > {};
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template <class Tuple, class Elem, int... Is>
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struct has_elem<Tuple, Elem, seq<Is...>>
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: disjunction<has_elem<tuple_element_t<Is, Tuple>, Elem>...> {};
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// Tuple trait for detecting static member element
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template <class Tuple, class Elem, class Enable = void>
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struct all_elem : false_type {};
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template <class Elem>
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struct all_elem<Elem, Elem> : true_type {};
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template <class Tuple, class Elem>
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struct all_elem<Tuple, Elem, enable_if_t<is_tuple<Tuple>::value> >
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: all_elem<Tuple, Elem, tuple_seq<Tuple> > {};
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template <class Tuple, class Elem, int... Is>
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struct all_elem<Tuple, Elem, seq<Is...>>
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: conjunction<all_elem<tuple_element_t<Is, Tuple>, Elem>...> {};
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// Tuple trait for detecting Underscore member
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template <class Tuple>
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using has_underscore = has_elem<Tuple, Underscore>;
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template <class Tuple>
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using all_underscore = all_elem<Tuple, Underscore>;
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template <class Tuple>
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using has_int1 = has_elem<Tuple, Int<1>>;
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template <class Tuple>
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using has_int0 = has_elem<Tuple, Int<0>>;
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//
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// Slice keeps only the elements of Tuple B that are paired with an Underscore
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//
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template <class A, class B>
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CUTE_HOST_DEVICE constexpr
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auto
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slice(A const& a, B const& b)
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{
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if constexpr (is_tuple<A>::value) {
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static_assert(tuple_size<A>::value == tuple_size<B>::value, "Mismatched Ranks");
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return filter_tuple(a, b, [](auto const& x, auto const& y) { return slice(x,y); });
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} else if constexpr (is_underscore<A>::value) {
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return cute::tuple<B>{b};
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} else {
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return cute::tuple<>{};
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}
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CUTE_GCC_UNREACHABLE;
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}
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//
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// Dice keeps only the elements of Tuple B that are paired with an Int
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//
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template <class A, class B>
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CUTE_HOST_DEVICE constexpr
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auto
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dice(A const& a, B const& b)
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{
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if constexpr (is_tuple<A>::value) {
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static_assert(tuple_size<A>::value == tuple_size<B>::value, "Mismatched Ranks");
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return filter_tuple(a, b, [](auto const& x, auto const& y) { return dice(x,y); });
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} else if constexpr (is_underscore<A>::value) {
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return cute::tuple<>{};
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} else {
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return cute::tuple<B>{b};
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}
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CUTE_GCC_UNREACHABLE;
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}
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//
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// Display utilities
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//
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CUTE_HOST_DEVICE void print(Underscore const&) {
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printf("_");
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}
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#if !defined(__CUDACC_RTC__)
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CUTE_HOST std::ostream& operator<<(std::ostream& os, Underscore const&) {
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return os << "_";
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}
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#endif
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} // end namespace cute
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