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util: add BitPack
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parent
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commit
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3 changed files with 92 additions and 2 deletions
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@ -42,6 +42,8 @@
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#define CONCATENATE_IMPL(S1, s2) s1##s2
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#define CONCATENATE(s1, s2) CONCATENATE_IMPL(s1, s2)
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#define BITSIZEOF(x) (sizeof(x) * CHAR_BIT)
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#ifdef __COUNTER__
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#define ANONYMOUS_VARIABLE(pref) CONCATENATE(pref, __COUNTER__)
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#else
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@ -55,8 +57,8 @@
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probability; \
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}))
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#define AMS_PREDICT_TRUE(expr, probability) AMS_PREDICT(!!expr, 1, probability)
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#define AMS_PREDICT_FALSE(expr, probability) AMS_PREDICT(!!expr, 0, probability)
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#define AMS_PREDICT_TRUE(expr, probability) AMS_PREDICT(!!(expr), 1, probability)
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#define AMS_PREDICT_FALSE(expr, probability) AMS_PREDICT(!!(expr), 0, probability)
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#define AMS_LIKELY(expr) AMS_PREDICT_TRUE(expr, 1.0)
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#define AMS_UNLIKELY(expr) AMS_PREDICT_FALSE(expr, 1.0)
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@ -20,6 +20,7 @@
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#include "util/util_alignment.hpp"
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#include "util/util_size.hpp"
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#include "util/util_fourcc.hpp"
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#include "util/util_bitpack.hpp"
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#include "util/util_scope_guard.hpp"
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#include "util/util_typed_storage.hpp"
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#include "util/util_intrusive_list.hpp"
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87
libraries/libvapours/include/vapours/util/util_bitpack.hpp
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87
libraries/libvapours/include/vapours/util/util_bitpack.hpp
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@ -0,0 +1,87 @@
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/*
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* Copyright (c) 2018-2019 Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "../defines.hpp"
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namespace ams::util {
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namespace impl {
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template<typename IntegralStorageType>
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class BitPack {
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private:
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static_assert(std::is_integral<IntegralStorageType>::value);
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static_assert(std::is_unsigned<IntegralStorageType>::value);
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template<size_t Index, size_t Count>
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static constexpr inline IntegralStorageType Mask = [] {
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static_assert(Index < BITSIZEOF(IntegralStorageType));
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static_assert(0 < Count && Count <= BITSIZEOF(IntegralStorageType));
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static_assert(Index + Count <= BITSIZEOF(IntegralStorageType));
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return ((IntegralStorageType(1) << Count) - 1) << Index;
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}();
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public:
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template<size_t _Index, size_t _Count, typename T>
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struct Field {
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using Type = T;
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static constexpr size_t Index = _Index;
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static constexpr size_t Count = _Count;
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static constexpr size_t Next = Index + Count;
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using BitPackType = BitPack<IntegralStorageType>;
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static_assert(Mask<Index, Count> != 0);
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static_assert(std::is_integral<T>::value);
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static_assert(!std::is_same<T, bool>::value || Count == 1);
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};
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private:
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IntegralStorageType value;
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public:
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constexpr ALWAYS_INLINE void Clear() {
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constexpr IntegralStorageType Zero = IntegralStorageType(0);
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this->value = Zero;
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}
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template<typename FieldType>
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constexpr ALWAYS_INLINE typename FieldType::Type Get() const {
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static_assert(std::is_same<FieldType, Field<FieldType::Index, FieldType::Count, typename FieldType::Type>>::value);
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return static_cast<typename FieldType::Type>((this->value & Mask<FieldType::Index, FieldType::Count>) >> FieldType::Index);
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}
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template<typename FieldType>
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constexpr ALWAYS_INLINE void Set(typename FieldType::Type field_value) {
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static_assert(std::is_same<FieldType, Field<FieldType::Index, FieldType::Count, typename FieldType::Type>>::value);
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constexpr IntegralStorageType FieldMask = Mask<FieldType::Index, FieldType::Count>;
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this->value &= ~FieldMask;
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this->value |= (static_cast<IntegralStorageType>(field_value) << FieldType::Index) & FieldMask;
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}
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};
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}
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using BitPack8 = impl::BitPack<u8>;
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using BitPack16 = impl::BitPack<u16>;
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using BitPack32 = impl::BitPack<u32>;
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using BitPack64 = impl::BitPack<u64>;
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static_assert(std::is_pod<BitPack8 >::value);
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static_assert(std::is_pod<BitPack16>::value);
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static_assert(std::is_pod<BitPack32>::value);
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static_assert(std::is_pod<BitPack64>::value);
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}
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