intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 49 insertions, 0 deletions

diff --git a/util/system/align.h b/util/system/align.h
new file mode 100644
index 0000000000..ea0bbc5b46
--- /dev/null
+++ b/util/system/align.h
@@ -0,0 +1,49 @@
+#pragma once
+
+#include "yassert.h"
+#include "defaults.h"
+#include <util/generic/bitops.h>
+
+template <class T>
+static inline T AlignDown(T len, T align) noexcept {
+    Y_ASSERT(IsPowerOf2(align)); // align should be power of 2
+    return len & ~(align - 1);
+}
+
+template <class T>
+static inline T AlignUp(T len, T align) noexcept {
+    const T alignedResult = AlignDown(len + (align - 1), align);
+    Y_ASSERT(alignedResult >= len); // check for overflow
+    return alignedResult;
+}
+
+template <class T>
+static inline T AlignUpSpace(T len, T align) noexcept {
+    Y_ASSERT(IsPowerOf2(align));       // align should be power of 2
+    return ((T)0 - len) & (align - 1); // AlignUp(len, align) - len;
+}
+
+template <class T>
+static inline T* AlignUp(T* ptr, size_t align) noexcept {
+    return (T*)AlignUp((uintptr_t)ptr, align);
+}
+
+template <class T>
+static inline T* AlignDown(T* ptr, size_t align) noexcept {
+    return (T*)AlignDown((uintptr_t)ptr, align);
+}
+
+template <class T>
+static inline T AlignUp(T t) noexcept {
+    return AlignUp(t, (size_t)PLATFORM_DATA_ALIGN);
+}
+
+template <class T>
+static inline T AlignDown(T t) noexcept {
+    return AlignDown(t, (size_t)PLATFORM_DATA_ALIGN);
+}
+
+template <class T>
+static inline T Align(T t) noexcept {
+    return AlignUp(t);
+}