2018-02-20 20:09:23 +00:00
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namespace ChocolArm64
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{
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static class ABitUtils
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{
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public static int HighestBitSet32(int Value)
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{
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for (int Bit = 31; Bit >= 0; Bit--)
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{
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if (((Value >> Bit) & 1) != 0)
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{
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return Bit;
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}
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}
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return -1;
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}
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2018-09-08 17:24:29 +00:00
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private static readonly sbyte[] HbsNibbleTbl = { -1, 0, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3 };
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public static int HighestBitSetNibble(int Value) => HbsNibbleTbl[Value & 0b1111];
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2018-02-20 20:09:23 +00:00
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public static long Replicate(long Bits, int Size)
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{
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long Output = 0;
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for (int Bit = 0; Bit < 64; Bit += Size)
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{
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Output |= Bits << Bit;
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}
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return Output;
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}
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public static long FillWithOnes(int Bits)
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{
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return Bits == 64 ? -1L : (1L << Bits) - 1;
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}
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public static long RotateRight(long Bits, int Shift, int Size)
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{
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2018-10-29 01:18:58 +00:00
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return (long)RotateRight((ulong)Bits, Shift, Size);
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2018-02-20 20:09:23 +00:00
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}
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2018-10-29 01:18:58 +00:00
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public static ulong RotateRight(ulong Bits, int Shift, int Size)
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2018-02-20 20:09:23 +00:00
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{
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2018-10-29 01:18:58 +00:00
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return (Bits >> Shift) | (Bits << (Size - Shift));
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2018-02-20 20:09:23 +00:00
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}
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}
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2018-09-08 17:24:29 +00:00
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}
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