1 files changed, 104 insertions, 0 deletions
diff --git a/Ryujinx.Common/Utilities/BitUtils.cs b/Ryujinx.Common/Utilities/BitUtils.cs
new file mode 100644
index 00000000..135b397d
--- /dev/null
+++ b/Ryujinx.Common/Utilities/BitUtils.cs
@@ -0,0 +1,104 @@
+namespace Ryujinx.Common
+{
+    public static class BitUtils
+    {
+        private static readonly byte[] ClzNibbleTbl = { 4, 3, 2, 2, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0 };
+
+        public static int AlignUp(int value, int size)
+        {
+            return (value + (size - 1)) & -size;
+        }
+
+        public static ulong AlignUp(ulong value, int size)
+        {
+            return (ulong)AlignUp((long)value, size);
+        }
+
+        public static long AlignUp(long value, int size)
+        {
+            return (value + (size - 1)) & -(long)size;
+        }
+
+        public static int AlignDown(int value, int size)
+        {
+            return value & -size;
+        }
+
+        public static ulong AlignDown(ulong value, int size)
+        {
+            return (ulong)AlignDown((long)value, size);
+        }
+
+        public static long AlignDown(long value, int size)
+        {
+            return value & -(long)size;
+        }
+
+        public static ulong DivRoundUp(ulong value, uint dividend)
+        {
+            return (value + dividend - 1) / dividend;
+        }
+
+        public static long DivRoundUp(long value, int dividend)
+        {
+            return (value + dividend - 1) / dividend;
+        }
+
+        public static bool IsPowerOfTwo32(int value)
+        {
+            return value != 0 && (value & (value - 1)) == 0;
+        }
+
+        public static bool IsPowerOfTwo64(long value)
+        {
+            return value != 0 && (value & (value - 1)) == 0;
+        }
+
+        public static int CountLeadingZeros32(int value)
+        {
+            return (int)CountLeadingZeros((ulong)value, 32);
+        }
+
+        public static int CountLeadingZeros64(long value)
+        {
+            return (int)CountLeadingZeros((ulong)value, 64);
+        }
+
+        private static ulong CountLeadingZeros(ulong value, int size)
+        {
+            if (value == 0ul)
+            {
+                return (ulong)size;
+            }
+
+            int nibbleIdx = size;
+            int preCount, count = 0;
+
+            do
+            {
+                nibbleIdx -= 4;
+                preCount = ClzNibbleTbl[(value >> nibbleIdx) & 0b1111];
+                count += preCount;
+            }
+            while (preCount == 4);
+
+            return (ulong)count;
+        }
+
+        public static long ReverseBits64(long value)
+        {
+            return (long)ReverseBits64((ulong)value);
+        }
+
+        private static ulong ReverseBits64(ulong value)
+        {
+            value = ((value & 0xaaaaaaaaaaaaaaaa) >> 1 ) | ((value & 0x5555555555555555) << 1 );
+            value = ((value & 0xcccccccccccccccc) >> 2 ) | ((value & 0x3333333333333333) << 2 );
+            value = ((value & 0xf0f0f0f0f0f0f0f0) >> 4 ) | ((value & 0x0f0f0f0f0f0f0f0f) << 4 );
+            value = ((value & 0xff00ff00ff00ff00) >> 8 ) | ((value & 0x00ff00ff00ff00ff) << 8 );
+            value = ((value & 0xffff0000ffff0000) >> 16) | ((value & 0x0000ffff0000ffff) << 16);
+
+            return (value >> 32) | (value << 32);
+        }
+    }
+}
+\ No newline at end of file