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author | Liam <byteslice@airmail.cc> | 2023-08-11 03:34:43 +0200 |
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committer | Liam <byteslice@airmail.cc> | 2023-08-15 23:47:25 +0200 |
commit | 86f6b6b7b2d930e8203114332b04a5c49a780b06 (patch) | |
tree | bf7ff58b0a36051d3c3489a40999d80357c570d0 /src/common/alignment.h | |
parent | Merge pull request #11287 from liamwhite/replaced-bytes (diff) | |
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Diffstat (limited to 'src/common/alignment.h')
-rw-r--r-- | src/common/alignment.h | 29 |
1 files changed, 27 insertions, 2 deletions
diff --git a/src/common/alignment.h b/src/common/alignment.h index fa715d497..0057052af 100644 --- a/src/common/alignment.h +++ b/src/common/alignment.h @@ -3,6 +3,7 @@ #pragma once +#include <bit> #include <cstddef> #include <new> #include <type_traits> @@ -10,7 +11,7 @@ namespace Common { template <typename T> - requires std::is_unsigned_v<T> + requires std::is_integral_v<T> [[nodiscard]] constexpr T AlignUp(T value, size_t size) { auto mod{static_cast<T>(value % size)}; value -= mod; @@ -24,7 +25,7 @@ template <typename T> } template <typename T> - requires std::is_unsigned_v<T> + requires std::is_integral_v<T> [[nodiscard]] constexpr T AlignDown(T value, size_t size) { return static_cast<T>(value - value % size); } @@ -55,6 +56,30 @@ template <typename T, typename U> return (x + (y - 1)) / y; } +template <typename T> + requires std::is_integral_v<T> +[[nodiscard]] constexpr T LeastSignificantOneBit(T x) { + return x & ~(x - 1); +} + +template <typename T> + requires std::is_integral_v<T> +[[nodiscard]] constexpr T ResetLeastSignificantOneBit(T x) { + return x & (x - 1); +} + +template <typename T> + requires std::is_integral_v<T> +[[nodiscard]] constexpr bool IsPowerOfTwo(T x) { + return x > 0 && ResetLeastSignificantOneBit(x) == 0; +} + +template <typename T> + requires std::is_integral_v<T> +[[nodiscard]] constexpr T FloorPowerOfTwo(T x) { + return T{1} << (sizeof(T) * 8 - std::countl_zero(x) - 1); +} + template <typename T, size_t Align = 16> class AlignmentAllocator { public: |