242 lines
10 KiB
C++
242 lines
10 KiB
C++
/*
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* Copyright 2017 - 2021 Justas Masiulis
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef JM_XORSTR_HPP
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#define JM_XORSTR_HPP
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#if defined(_M_ARM64) || defined(__aarch64__) || defined(_M_ARM) || defined(__arm__)
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#include <arm_neon.h>
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#elif defined(_M_X64) || defined(__amd64__) || defined(_M_IX86) || defined(__i386__)
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#include <immintrin.h>
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#else
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#error Unsupported platform
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#endif
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#include <cstdint>
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#include <cstddef>
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#include <utility>
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#include <type_traits>
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#define xorstr(str) ::OqYAfkhl::swG([]() { return str; }, std::integral_constant<std::size_t, sizeof(str) / sizeof(*str)>{}, std::make_index_sequence<::OqYAfkhl::CtKWt::UfWL<sizeof(str)>()>{})
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#define xorstr_(str) xorstr(str).Pr()
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#ifdef _MSC_VER
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#define XORSTR_FORCEINLINE __forceinline
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#else
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#define XORSTR_FORCEINLINE __attribute__((always_inline)) inline
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#endif
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namespace OqYAfkhl {
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namespace CtKWt {
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template<std::size_t Size>
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XORSTR_FORCEINLINE constexpr std::size_t UfWL()
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{
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return ((Size / 16) + (Size % 16 != 0)) * 2;
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}
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template<std::uint32_t Seed>
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XORSTR_FORCEINLINE constexpr std::uint32_t rY() noexcept
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{
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std::uint32_t value = Seed;
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for(char c : __TIME__)
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value = static_cast<std::uint32_t>((value ^ c) * 16777619ull);
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return value;
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}
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template<std::size_t S>
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XORSTR_FORCEINLINE constexpr std::uint64_t WL()
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{
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constexpr auto first_part = rY<2166136261 + S>();
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constexpr auto second_part = rY<first_part>();
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return (static_cast<std::uint64_t>(first_part) << 32) | second_part;
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}
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// loads up to 8 characters of string into uint64 and xors it with the key
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template<std::size_t N, class CharT>
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XORSTR_FORCEINLINE constexpr std::uint64_t
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EE(std::uint64_t key, std::size_t idx, const CharT* str) noexcept
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{
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using cast_type = typename std::make_unsigned<CharT>::type;
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constexpr auto value_size = sizeof(CharT);
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constexpr auto idx_offset = 8 / value_size;
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std::uint64_t value = key;
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for(std::size_t i = 0; i < idx_offset && i + idx * idx_offset < N; ++i)
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value ^=
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(std::uint64_t{ static_cast<cast_type>(str[i + idx * idx_offset]) }
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<< ((i % idx_offset) * 8 * value_size));
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return value;
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}
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// forces compiler to use registers instead of stuffing constants in rdata
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XORSTR_FORCEINLINE std::uint64_t Fw(std::uint64_t value) noexcept
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{
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#if defined(__clang__) || defined(__GNUC__)
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asm("" : "=r"(value) : "0"(value) :);
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return value;
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#else
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volatile std::uint64_t reg = value;
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return reg;
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#endif
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}
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} // namespace detail
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template<class CharT, std::size_t Size, class Keys, class Indices>
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class swG;
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template<class CharT, std::size_t Size, std::uint64_t... Keys, std::size_t... Indices>
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class swG<CharT, Size, std::integer_sequence<std::uint64_t, Keys...>, std::index_sequence<Indices...>> {
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#ifndef JM_XORSTR_DISABLE_AVX_INTRINSICS
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constexpr static inline std::uint64_t alignment = ((Size > 16) ? 32 : 16);
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#else
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constexpr static inline std::uint64_t alignment = 16;
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#endif
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alignas(alignment) std::uint64_t _storage[sizeof...(Keys)];
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public:
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using value_type = CharT;
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using size_type = std::size_t;
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using pointer = CharT*;
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using const_pointer = const CharT*;
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template<class L>
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XORSTR_FORCEINLINE swG(L l, std::integral_constant<std::size_t, Size>, std::index_sequence<Indices...>) noexcept
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: _storage{ ::OqYAfkhl::CtKWt::Fw((std::integral_constant<std::uint64_t, CtKWt::EE<Size>(Keys, Indices, l())>::value))... }
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{}
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XORSTR_FORCEINLINE constexpr size_type size() const noexcept
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{
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return Size - 1;
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}
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XORSTR_FORCEINLINE void fO() noexcept
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{
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// everything is inlined by hand because a certain compiler with a certain linker is _very_ slow
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#if defined(__clang__)
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alignas(alignment)
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std::uint64_t arr[]{ ::OqYAfkhl::CtKWt::Fw(Keys)... };
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std::uint64_t* keys =
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(std::uint64_t*)::OqYAfkhl::CtKWt::Fw((std::uint64_t)arr);
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#else
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alignas(alignment) std::uint64_t keys[]{ ::OqYAfkhl::CtKWt::Fw(Keys)... };
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#endif
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#if defined(_M_ARM64) || defined(__aarch64__) || defined(_M_ARM) || defined(__arm__)
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#if defined(__clang__)
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((Indices >= sizeof(_storage) / 16 ? static_cast<void>(0) : __builtin_neon_vst1q_v(
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reinterpret_cast<uint64_t*>(_storage) + Indices * 2,
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veorq_u64(__builtin_neon_vld1q_v(reinterpret_cast<const uint64_t*>(_storage) + Indices * 2, 51),
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__builtin_neon_vld1q_v(reinterpret_cast<const uint64_t*>(keys) + Indices * 2, 51)),
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51)), ...);
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#else // GCC, MSVC
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((Indices >= sizeof(_storage) / 16 ? static_cast<void>(0) : vst1q_u64(
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reinterpret_cast<uint64_t*>(_storage) + Indices * 2,
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veorq_u64(vld1q_u64(reinterpret_cast<const uint64_t*>(_storage) + Indices * 2),
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vld1q_u64(reinterpret_cast<const uint64_t*>(keys) + Indices * 2)))), ...);
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#endif
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#elif !defined(JM_XORSTR_DISABLE_AVX_INTRINSICS)
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((Indices >= sizeof(_storage) / 32 ? static_cast<void>(0) : _mm256_store_si256(
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reinterpret_cast<__m256i*>(_storage) + Indices,
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_mm256_xor_si256(
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_mm256_load_si256(reinterpret_cast<const __m256i*>(_storage) + Indices),
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_mm256_load_si256(reinterpret_cast<const __m256i*>(keys) + Indices)))), ...);
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if constexpr(sizeof(_storage) % 32 != 0)
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_mm_store_si128(
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reinterpret_cast<__m128i*>(_storage + sizeof...(Keys) - 2),
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_mm_xor_si128(_mm_load_si128(reinterpret_cast<const __m128i*>(_storage + sizeof...(Keys) - 2)),
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_mm_load_si128(reinterpret_cast<const __m128i*>(keys + sizeof...(Keys) - 2))));
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#else
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((Indices >= sizeof(_storage) / 16 ? static_cast<void>(0) : _mm_store_si128(
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reinterpret_cast<__m128i*>(_storage) + Indices,
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_mm_xor_si128(_mm_load_si128(reinterpret_cast<const __m128i*>(_storage) + Indices),
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_mm_load_si128(reinterpret_cast<const __m128i*>(keys) + Indices)))), ...);
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#endif
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}
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XORSTR_FORCEINLINE const_pointer Ce() const noexcept
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{
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return reinterpret_cast<const_pointer>(_storage);
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}
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XORSTR_FORCEINLINE pointer Ce() noexcept
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{
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return reinterpret_cast<pointer>(_storage);
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}
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XORSTR_FORCEINLINE pointer Pr() noexcept
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{
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// fO() is inlined by hand because a certain compiler with a certain linker is _very_ slow
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#if defined(__clang__)
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alignas(alignment)
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std::uint64_t arr[]{ ::OqYAfkhl::CtKWt::Fw(Keys)... };
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std::uint64_t* keys =
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(std::uint64_t*)::OqYAfkhl::CtKWt::Fw((std::uint64_t)arr);
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#else
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alignas(alignment) std::uint64_t keys[]{ ::OqYAfkhl::CtKWt::Fw(Keys)... };
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#endif
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#if defined(_M_ARM64) || defined(__aarch64__) || defined(_M_ARM) || defined(__arm__)
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#if defined(__clang__)
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((Indices >= sizeof(_storage) / 16 ? static_cast<void>(0) : __builtin_neon_vst1q_v(
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reinterpret_cast<uint64_t*>(_storage) + Indices * 2,
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veorq_u64(__builtin_neon_vld1q_v(reinterpret_cast<const uint64_t*>(_storage) + Indices * 2, 51),
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__builtin_neon_vld1q_v(reinterpret_cast<const uint64_t*>(keys) + Indices * 2, 51)),
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51)), ...);
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#else // GCC, MSVC
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((Indices >= sizeof(_storage) / 16 ? static_cast<void>(0) : vst1q_u64(
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reinterpret_cast<uint64_t*>(_storage) + Indices * 2,
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veorq_u64(vld1q_u64(reinterpret_cast<const uint64_t*>(_storage) + Indices * 2),
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vld1q_u64(reinterpret_cast<const uint64_t*>(keys) + Indices * 2)))), ...);
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#endif
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#elif !defined(JM_XORSTR_DISABLE_AVX_INTRINSICS)
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((Indices >= sizeof(_storage) / 32 ? static_cast<void>(0) : _mm256_store_si256(
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reinterpret_cast<__m256i*>(_storage) + Indices,
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_mm256_xor_si256(
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_mm256_load_si256(reinterpret_cast<const __m256i*>(_storage) + Indices),
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_mm256_load_si256(reinterpret_cast<const __m256i*>(keys) + Indices)))), ...);
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if constexpr(sizeof(_storage) % 32 != 0)
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_mm_store_si128(
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reinterpret_cast<__m128i*>(_storage + sizeof...(Keys) - 2),
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_mm_xor_si128(_mm_load_si128(reinterpret_cast<const __m128i*>(_storage + sizeof...(Keys) - 2)),
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_mm_load_si128(reinterpret_cast<const __m128i*>(keys + sizeof...(Keys) - 2))));
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#else
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((Indices >= sizeof(_storage) / 16 ? static_cast<void>(0) : _mm_store_si128(
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reinterpret_cast<__m128i*>(_storage) + Indices,
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_mm_xor_si128(_mm_load_si128(reinterpret_cast<const __m128i*>(_storage) + Indices),
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_mm_load_si128(reinterpret_cast<const __m128i*>(keys) + Indices)))), ...);
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#endif
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return (pointer)(_storage);
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}
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};
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template<class L, std::size_t Size, std::size_t... Indices>
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swG(L l, std::integral_constant<std::size_t, Size>, std::index_sequence<Indices...>) -> swG<
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std::remove_const_t<std::remove_reference_t<decltype(l()[0])>>,
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Size,
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std::integer_sequence<std::uint64_t, CtKWt::WL<Indices>()...>,
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std::index_sequence<Indices...>>;
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} // namespace jm
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#endif // include guard
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