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using System.Numerics;
namespace Ryujinx.Common
{
public static class BitUtils
{
public static T AlignUp<T>(T value, T size)
where T : IBinaryInteger<T>
{
return (value + (size - T.One)) & -size;
}
public static T AlignDown<T>(T value, T size)
where T : IBinaryInteger<T>
{
return value & -size;
}
public static T DivRoundUp<T>(T value, T dividend)
where T : IBinaryInteger<T>
{
return (value + (dividend - T.One)) / dividend;
}
public static int Pow2RoundUp(int value)
{
value--;
value |= (value >> 1);
value |= (value >> 2);
value |= (value >> 4);
value |= (value >> 8);
value |= (value >> 16);
return ++value;
}
public static int Pow2RoundDown(int value)
{
return BitOperations.IsPow2(value) ? value : Pow2RoundUp(value) >> 1;
}
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);
}
}
}
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