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namespace ChocolArm64
{
static class BitUtils
{
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));
}
}
}
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