Ryujinx/Cpu/ABitUtils.cs


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57

namespace ChocolArm64
{
    static class ABitUtils
    {
        public static int CountBitsSet(long Value)
        {
            int Count = 0;

            for (int Bit = 0; Bit < 64; Bit++)
            {
                Count += (int)(Value >> Bit) & 1;
            }

            return Count;
        }

        public static int HighestBitSet32(int Value)
        {
            for (int Bit = 31; Bit >= 0; Bit--)
            {
                if (((Value >> Bit) & 1) != 0)
                {
                    return Bit;
                }
            }

            return -1;
        }

        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 (Bits >> Shift) | (Bits << (Size - Shift));
        }

        public static bool IsPow2(int Value)
        {
            return Value != 0 && (Value & (Value - 1)) == 0;
        }
    }
}