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Atmosphere/libraries/libvapours/include/vapours/util/util_alignment.hpp

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2.9 KiB
C++

/*
* Copyright (c) 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 <vapours/common.hpp>
#include <vapours/assert.hpp>
#include <vapours/util/util_bitutil.hpp>
namespace ams::util {
/* Utilities for alignment to power of two. */
template<typename T>
constexpr ALWAYS_INLINE T AlignUp(T value, size_t alignment) {
using U = typename std::make_unsigned<T>::type;
const U invmask = static_cast<U>(alignment - 1);
return static_cast<T>((value + invmask) & ~invmask);
}
template<typename T>
constexpr ALWAYS_INLINE T AlignDown(T value, size_t alignment) {
using U = typename std::make_unsigned<T>::type;
const U invmask = static_cast<U>(alignment - 1);
return static_cast<T>(value & ~invmask);
}
template<typename T>
constexpr ALWAYS_INLINE bool IsAligned(T value, size_t alignment) {
using U = typename std::make_unsigned<T>::type;
const U invmask = static_cast<U>(alignment - 1);
return (value & invmask) == 0;
}
template<typename T> requires std::unsigned_integral<T>
constexpr ALWAYS_INLINE T GetAlignment(T value) {
return value & -value;
}
template<>
ALWAYS_INLINE void *AlignUp<void *>(void *value, size_t alignment) {
return reinterpret_cast<void *>(AlignUp(reinterpret_cast<uintptr_t>(value), alignment));
}
template<>
ALWAYS_INLINE const void *AlignUp<const void *>(const void *value, size_t alignment) {
return reinterpret_cast<const void *>(AlignUp(reinterpret_cast<uintptr_t>(value), alignment));
}
template<>
ALWAYS_INLINE void *AlignDown<void *>(void *value, size_t alignment) {
return reinterpret_cast<void *>(AlignDown(reinterpret_cast<uintptr_t>(value), alignment));
}
template<>
ALWAYS_INLINE const void *AlignDown<const void *>(const void *value, size_t alignment) {
return reinterpret_cast<void *>(AlignDown(reinterpret_cast<uintptr_t>(value), alignment));
}
template<>
ALWAYS_INLINE bool IsAligned<void *>(void *value, size_t alignment) {
return IsAligned(reinterpret_cast<uintptr_t>(value), alignment);
}
template<>
ALWAYS_INLINE bool IsAligned<const void *>(const void *value, size_t alignment) {
return IsAligned(reinterpret_cast<uintptr_t>(value), alignment);
}
}