mirror of
https://github.com/Ryujinx/Ryujinx.git
synced 2024-09-12 02:38:50 +02:00
50 lines
1.2 KiB
C#
50 lines
1.2 KiB
C#
|
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));
|
||
|
}
|
||
|
}
|
||
|
}
|