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util: add BitPack

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This commit is contained in:
Michael Scire 2020-01-02 01:41:52 -08:00
parent 48772307bf
commit 145ee8fcc8
3 changed files with 92 additions and 2 deletions
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6
libraries/libvapours/include/vapours/defines.hpp
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@ -42,6 +42,8 @@
#define CONCATENATE_IMPL(S1, s2) s1##s2
#define CONCATENATE(s1, s2) CONCATENATE_IMPL(s1, s2)
#define BITSIZEOF(x) (sizeof(x) * CHAR_BIT)
#ifdef __COUNTER__
#define ANONYMOUS_VARIABLE(pref) CONCATENATE(pref, __COUNTER__)
#else
@ -55,8 +57,8 @@
probability; \
}))
#define AMS_PREDICT_TRUE(expr, probability) AMS_PREDICT(!!expr, 1, probability)
#define AMS_PREDICT_FALSE(expr, probability) AMS_PREDICT(!!expr, 0, probability)
#define AMS_PREDICT_TRUE(expr, probability) AMS_PREDICT(!!(expr), 1, probability)
#define AMS_PREDICT_FALSE(expr, probability) AMS_PREDICT(!!(expr), 0, probability)
#define AMS_LIKELY(expr) AMS_PREDICT_TRUE(expr, 1.0)
#define AMS_UNLIKELY(expr) AMS_PREDICT_FALSE(expr, 1.0)

1
libraries/libvapours/include/vapours/util.hpp
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@ -20,6 +20,7 @@
#include "util/util_alignment.hpp"
#include "util/util_size.hpp"
#include "util/util_fourcc.hpp"
#include "util/util_bitpack.hpp"
#include "util/util_scope_guard.hpp"
#include "util/util_typed_storage.hpp"
#include "util/util_intrusive_list.hpp"

87
libraries/libvapours/include/vapours/util/util_bitpack.hpp Normal file
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@ -0,0 +1,87 @@
/*
* Copyright (c) 2018-2019 Atmosphère-NX
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "../defines.hpp"
namespace ams::util {
namespace impl {
template<typename IntegralStorageType>
class BitPack {
private:
static_assert(std::is_integral<IntegralStorageType>::value);
static_assert(std::is_unsigned<IntegralStorageType>::value);
template<size_t Index, size_t Count>
static constexpr inline IntegralStorageType Mask = [] {
static_assert(Index < BITSIZEOF(IntegralStorageType));
static_assert(0 < Count && Count <= BITSIZEOF(IntegralStorageType));
static_assert(Index + Count <= BITSIZEOF(IntegralStorageType));
return ((IntegralStorageType(1) << Count) - 1) << Index;
}();
public:
template<size_t _Index, size_t _Count, typename T>
struct Field {
using Type = T;
static constexpr size_t Index = _Index;
static constexpr size_t Count = _Count;
static constexpr size_t Next = Index + Count;
using BitPackType = BitPack<IntegralStorageType>;
static_assert(Mask<Index, Count> != 0);
static_assert(std::is_integral<T>::value);
static_assert(!std::is_same<T, bool>::value || Count == 1);
};
private:
IntegralStorageType value;
public:
constexpr ALWAYS_INLINE void Clear() {
constexpr IntegralStorageType Zero = IntegralStorageType(0);
this->value = Zero;
}
template<typename FieldType>
constexpr ALWAYS_INLINE typename FieldType::Type Get() const {
static_assert(std::is_same<FieldType, Field<FieldType::Index, FieldType::Count, typename FieldType::Type>>::value);
return static_cast<typename FieldType::Type>((this->value & Mask<FieldType::Index, FieldType::Count>) >> FieldType::Index);
}
template<typename FieldType>
constexpr ALWAYS_INLINE void Set(typename FieldType::Type field_value) {
static_assert(std::is_same<FieldType, Field<FieldType::Index, FieldType::Count, typename FieldType::Type>>::value);
constexpr IntegralStorageType FieldMask = Mask<FieldType::Index, FieldType::Count>;
this->value &= ~FieldMask;
this->value |= (static_cast<IntegralStorageType>(field_value) << FieldType::Index) & FieldMask;
}
};
}
using BitPack8 = impl::BitPack<u8>;
using BitPack16 = impl::BitPack<u16>;
using BitPack32 = impl::BitPack<u32>;
using BitPack64 = impl::BitPack<u64>;
static_assert(std::is_pod<BitPack8 >::value);
static_assert(std::is_pod<BitPack16>::value);
static_assert(std::is_pod<BitPack32>::value);
static_assert(std::is_pod<BitPack64>::value);
}