mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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86 lines
3.1 KiB
C++
86 lines
3.1 KiB
C++
/*
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* Copyright (c) 2018-2020 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 <vapours/common.hpp>
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#include <vapours/assert.hpp>
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#include <vapours/util/util_bitutil.hpp>
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namespace ams::util {
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/* Utilities for alignment to power of two. */
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template<typename T>
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constexpr ALWAYS_INLINE T AlignUp(T value, size_t alignment) {
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using U = typename std::make_unsigned<T>::type;
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const U invmask = static_cast<U>(alignment - 1);
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return static_cast<T>((value + invmask) & ~invmask);
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}
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template<typename T>
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constexpr ALWAYS_INLINE T AlignDown(T value, size_t alignment) {
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using U = typename std::make_unsigned<T>::type;
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const U invmask = static_cast<U>(alignment - 1);
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return static_cast<T>(value & ~invmask);
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}
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template<typename T>
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constexpr ALWAYS_INLINE bool IsAligned(T value, size_t alignment) {
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using U = typename std::make_unsigned<T>::type;
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const U invmask = static_cast<U>(alignment - 1);
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return (value & invmask) == 0;
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}
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template<typename T> requires std::unsigned_integral<T>
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constexpr ALWAYS_INLINE T GetAlignment(T value) {
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return value & -value;
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}
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template<>
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constexpr ALWAYS_INLINE void *AlignUp<void *>(void *value, size_t alignment) {
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return reinterpret_cast<void *>(AlignUp(reinterpret_cast<uintptr_t>(value), alignment));
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}
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template<>
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constexpr ALWAYS_INLINE const void *AlignUp<const void *>(const void *value, size_t alignment) {
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return reinterpret_cast<const void *>(AlignUp(reinterpret_cast<uintptr_t>(value), alignment));
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}
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template<>
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constexpr ALWAYS_INLINE void *AlignDown<void *>(void *value, size_t alignment) {
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return reinterpret_cast<void *>(AlignDown(reinterpret_cast<uintptr_t>(value), alignment));
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}
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template<>
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constexpr ALWAYS_INLINE const void *AlignDown<const void *>(const void *value, size_t alignment) {
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return reinterpret_cast<void *>(AlignDown(reinterpret_cast<uintptr_t>(value), alignment));
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}
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template<>
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constexpr ALWAYS_INLINE bool IsAligned<void *>(void *value, size_t alignment) {
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return IsAligned(reinterpret_cast<uintptr_t>(value), alignment);
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}
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template<>
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constexpr ALWAYS_INLINE bool IsAligned<const void *>(const void *value, size_t alignment) {
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return IsAligned(reinterpret_cast<uintptr_t>(value), alignment);
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}
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template<typename T, typename U> requires std::integral<T> && std::integral<U>
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constexpr ALWAYS_INLINE T DivideUp(T x, U y) {
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return (x + (y - 1)) / y;
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}
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}
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