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Merge pull request #5357 from ReinUsesLisp/alignment-log2

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common/alignment: Rename AlignBits to AlignUpLog2 and use constraints
This commit is contained in:
LC
2021-01-15 03:12:36 -05:00
committed by GitHub
parent 5b9aedfc21 89c15dd115
commit 9754a8145c
4 changed files with 25 additions and 30 deletions
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33
src/common/alignment.h
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@ -9,50 +9,45 @@
namespace Common {
template <typename T>
[[nodiscard]] constexpr T AlignUp(T value, std::size_t size) {
static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
requires std::is_unsigned_v<T>[[nodiscard]] constexpr T AlignUp(T value, size_t size) {
auto mod{static_cast<T>(value % size)};
value -= mod;
return static_cast<T>(mod == T{0} ? value : value + size);
}
template <typename T>
[[nodiscard]] constexpr T AlignDown(T value, std::size_t size) {
static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
requires std::is_unsigned_v<T>[[nodiscard]] constexpr T AlignUpLog2(T value, size_t align_log2) {
return static_cast<T>((value + ((1ULL << align_log2) - 1)) >> align_log2 << align_log2);
}
template <typename T>
requires std::is_unsigned_v<T>[[nodiscard]] constexpr T AlignDown(T value, size_t size) {
return static_cast<T>(value - value % size);
}
template <typename T>
[[nodiscard]] constexpr T AlignBits(T value, std::size_t align) {
static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
return static_cast<T>((value + ((1ULL << align) - 1)) >> align << align);
}
template <typename T>
[[nodiscard]] constexpr bool Is4KBAligned(T value) {
static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
requires std::is_unsigned_v<T>[[nodiscard]] constexpr bool Is4KBAligned(T value) {
return (value & 0xFFF) == 0;
}
template <typename T>
[[nodiscard]] constexpr bool IsWordAligned(T value) {
static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
requires std::is_unsigned_v<T>[[nodiscard]] constexpr bool IsWordAligned(T value) {
return (value & 0b11) == 0;
}
template <typename T>
[[nodiscard]] constexpr bool IsAligned(T value, std::size_t alignment) {
using U = typename std::make_unsigned<T>::type;
requires std::is_integral_v<T>[[nodiscard]] constexpr bool IsAligned(T value, size_t alignment) {
using U = typename std::make_unsigned_t<T>;
const U mask = static_cast<U>(alignment - 1);
return (value & mask) == 0;
}
template <typename T, std::size_t Align = 16>
template <typename T, size_t Align = 16>
class AlignmentAllocator {
public:
using value_type = T;
using size_type = std::size_t;
using difference_type = std::ptrdiff_t;
using size_type = size_t;
using difference_type = ptrdiff_t;
using propagate_on_container_copy_assignment = std::true_type;
using propagate_on_container_move_assignment = std::true_type;