ChocolArm64/ABitUtils.cs

50 lines
1.2 KiB
C#

namespace ChocolArm64
{
static class ABitUtils
{
public static int HighestBitSet32(int Value)
{
for (int Bit = 31; Bit >= 0; Bit--)
{
if (((Value >> Bit) & 1) != 0)
{
return Bit;
}
}
return -1;
}
private static readonly sbyte[] HbsNibbleTbl = { -1, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3 };
public static int HighestBitSetNibble(int Value) => HbsNibbleTbl[Value & 0b1111];
public static long Replicate(long Bits, int Size)
{
long Output = 0;
for (int Bit = 0; Bit < 64; Bit += Size)
{
Output |= Bits << Bit;
}
return Output;
}
public static long FillWithOnes(int Bits)
{
return Bits == 64 ? -1L : (1L << Bits) - 1;
}
public static long RotateRight(long Bits, int Shift, int Size)
{
return (long)RotateRight((ulong)Bits, Shift, Size);
}
public static ulong RotateRight(ulong Bits, int Shift, int Size)
{
return (Bits >> Shift) | (Bits << (Size - Shift));
}
}
}