819 lines
26 KiB
C#
819 lines
26 KiB
C#
using System;
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using System.Diagnostics;
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using Unity.Mathematics;
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namespace Unity.Collections
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{
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[BurstCompatible]
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internal unsafe struct Bitwise
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{
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internal static int AlignDown(int value, int alignPow2)
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{
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return value & ~(alignPow2 - 1);
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}
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internal static int AlignUp(int value, int alignPow2)
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{
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return AlignDown(value + alignPow2 - 1, alignPow2);
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}
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internal static int FromBool(bool value)
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{
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return value ? 1 : 0;
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}
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// 32-bit uint
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internal static uint ExtractBits(uint input, int pos, uint mask)
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{
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var tmp0 = input >> pos;
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return tmp0 & mask;
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}
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internal static uint ReplaceBits(uint input, int pos, uint mask, uint value)
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{
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var tmp0 = (value & mask) << pos;
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var tmp1 = input & ~(mask << pos);
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return tmp0 | tmp1;
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}
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internal static uint SetBits(uint input, int pos, uint mask, bool value)
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{
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return ReplaceBits(input, pos, mask, (uint)-FromBool(value));
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}
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// 64-bit ulong
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internal static ulong ExtractBits(ulong input, int pos, ulong mask)
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{
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var tmp0 = input >> pos;
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return tmp0 & mask;
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}
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internal static ulong ReplaceBits(ulong input, int pos, ulong mask, ulong value)
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{
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var tmp0 = (value & mask) << pos;
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var tmp1 = input & ~(mask << pos);
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return tmp0 | tmp1;
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}
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internal static ulong SetBits(ulong input, int pos, ulong mask, bool value)
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{
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return ReplaceBits(input, pos, mask, (ulong)-(long)FromBool(value));
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}
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internal static int lzcnt(byte value)
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{
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return math.lzcnt((uint)value) - 24;
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}
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internal static int tzcnt(byte value)
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{
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return math.min(8, math.tzcnt((uint)value));
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}
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internal static int lzcnt(ushort value)
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{
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return math.lzcnt((uint)value) - 16;
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}
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internal static int tzcnt(ushort value)
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{
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return math.min(16, math.tzcnt((uint)value));
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}
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static int FindUlong(ulong* ptr, int beginBit, int endBit, int numBits)
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{
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var bits = ptr;
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var numSteps = (numBits + 63) >> 6;
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var numBitsPerStep = 64;
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var maxBits = numSteps * numBitsPerStep;
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for (int i = beginBit / numBitsPerStep, end = AlignUp(endBit, numBitsPerStep) / numBitsPerStep; i < end; ++i)
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{
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if (bits[i] != 0)
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{
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continue;
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}
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var idx = i * numBitsPerStep;
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var num = math.min(idx + numBitsPerStep, endBit) - idx;
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if (idx != beginBit)
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{
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var test = bits[idx / numBitsPerStep - 1];
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var newIdx = math.max(idx - math.lzcnt(test), beginBit);
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num += idx - newIdx;
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idx = newIdx;
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}
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for (++i; i < end; ++i)
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{
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if (num >= numBits)
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{
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return idx;
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}
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var test = bits[i];
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var pos = i * numBitsPerStep;
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num += math.min(pos + math.tzcnt(test), endBit) - pos;
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if (test != 0)
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{
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break;
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}
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}
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if (num >= numBits)
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{
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return idx;
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}
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}
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return endBit;
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}
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static int FindUint(ulong* ptr, int beginBit, int endBit, int numBits)
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{
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var bits = (uint*)ptr;
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var numSteps = (numBits + 31) >> 5;
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var numBitsPerStep = 32;
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var maxBits = numSteps * numBitsPerStep;
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for (int i = beginBit / numBitsPerStep, end = AlignUp(endBit, numBitsPerStep) / numBitsPerStep; i < end; ++i)
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{
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if (bits[i] != 0)
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{
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continue;
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}
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var idx = i * numBitsPerStep;
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var num = math.min(idx + numBitsPerStep, endBit) - idx;
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if (idx != beginBit)
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{
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var test = bits[idx / numBitsPerStep - 1];
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var newIdx = math.max(idx - math.lzcnt(test), beginBit);
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num += idx - newIdx;
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idx = newIdx;
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}
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for (++i; i < end; ++i)
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{
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if (num >= numBits)
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{
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return idx;
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}
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var test = bits[i];
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var pos = i * numBitsPerStep;
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num += math.min(pos + math.tzcnt(test), endBit) - pos;
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if (test != 0)
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{
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break;
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}
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}
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if (num >= numBits)
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{
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return idx;
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}
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}
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return endBit;
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}
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static int FindUshort(ulong* ptr, int beginBit, int endBit, int numBits)
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{
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var bits = (ushort*)ptr;
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var numSteps = (numBits + 15) >> 4;
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var numBitsPerStep = 16;
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var maxBits = numSteps * numBitsPerStep;
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for (int i = beginBit / numBitsPerStep, end = AlignUp(endBit, numBitsPerStep) / numBitsPerStep; i < end; ++i)
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{
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if (bits[i] != 0)
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{
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continue;
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}
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var idx = i * numBitsPerStep;
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var num = math.min(idx + numBitsPerStep, endBit) - idx;
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if (idx != beginBit)
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{
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var test = bits[idx / numBitsPerStep - 1];
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var newIdx = math.max(idx - lzcnt(test), beginBit);
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num += idx - newIdx;
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idx = newIdx;
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}
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for (++i; i < end; ++i)
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{
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if (num >= numBits)
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{
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return idx;
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}
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var test = bits[i];
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var pos = i * numBitsPerStep;
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num += math.min(pos + tzcnt(test), endBit) - pos;
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if (test != 0)
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{
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break;
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}
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}
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if (num >= numBits)
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{
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return idx;
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}
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}
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return endBit;
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}
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static int FindByte(ulong* ptr, int beginBit, int endBit, int numBits)
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{
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var bits = (byte*)ptr;
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var numSteps = (numBits + 7) >> 3;
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var numBitsPerStep = 8;
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var maxBits = numSteps * numBitsPerStep;
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for (int i = beginBit / numBitsPerStep, end = AlignUp(endBit, numBitsPerStep) / numBitsPerStep; i < end; ++i)
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{
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if (bits[i] != 0)
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{
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continue;
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}
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var idx = i * numBitsPerStep;
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var num = math.min(idx + numBitsPerStep, endBit) - idx;
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if (idx != beginBit)
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{
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var test = bits[idx / numBitsPerStep - 1];
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var newIdx = math.max(idx - lzcnt(test), beginBit);
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num += idx - newIdx;
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idx = newIdx;
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}
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for (++i; i < end; ++i)
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{
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if (num >= numBits)
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{
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return idx;
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}
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var test = bits[i];
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var pos = i * numBitsPerStep;
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num += math.min(pos + tzcnt(test), endBit) - pos;
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if (test != 0)
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{
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break;
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}
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}
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if (num >= numBits)
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{
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return idx;
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}
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}
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return endBit;
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}
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static int FindUpto14bits(ulong* ptr, int beginBit, int endBit, int numBits)
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{
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var bits = (byte*)ptr;
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var bit = (byte)(beginBit & 7);
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byte beginMask = (byte)~(0xff << bit);
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var lz = 0;
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for (int begin = beginBit / 8, end = AlignUp(endBit, 8) / 8, i = begin; i < end; ++i)
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{
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var test = bits[i];
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test |= i == begin ? beginMask : (byte)0;
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if (test == 0xff)
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{
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continue;
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}
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var pos = i * 8;
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var tz = math.min(pos + tzcnt(test), endBit) - pos;
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if (lz + tz >= numBits)
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{
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return pos - lz;
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}
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lz = lzcnt(test);
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var idx = pos + 8;
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var newIdx = math.max(idx - lz, beginBit);
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lz = math.min(idx, endBit) - newIdx;
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if (lz >= numBits)
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{
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return newIdx;
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}
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}
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return endBit;
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}
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static int FindUpto6bits(ulong* ptr, int beginBit, int endBit, int numBits)
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{
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var bits = (byte*)ptr;
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byte beginMask = (byte)~(0xff << (beginBit & 7));
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byte endMask = (byte)~(0xff >> ((8-(endBit & 7) & 7)));
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var mask = 1 << numBits - 1;
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for (int begin = beginBit / 8, end = AlignUp(endBit, 8) / 8, i = begin; i < end; ++i)
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{
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var test = bits[i];
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test |= i == begin ? beginMask : (byte)0;
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test |= i == end - 1 ? endMask : (byte)0;
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if (test == 0xff)
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{
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continue;
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}
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for (int pos = i * 8, posEnd = pos + 7; pos < posEnd; ++pos)
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{
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var tz = tzcnt((byte)(test^0xff));
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test >>= tz;
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pos += tz;
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if ((test & mask) == 0)
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{
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return pos;
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}
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test >>= 1;
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}
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}
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return endBit;
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}
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internal static int FindWithBeginEnd(ulong* ptr, int beginBit, int endBit, int numBits)
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{
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int idx;
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if (numBits >= 127)
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{
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idx = FindUlong(ptr, beginBit, endBit, numBits);
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if (idx != endBit)
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{
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return idx;
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}
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}
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if (numBits >= 63)
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{
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idx = FindUint(ptr, beginBit, endBit, numBits);
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if (idx != endBit)
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{
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return idx;
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}
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}
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if (numBits >= 128)
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{
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// early out - no smaller step will find this gap
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return int.MaxValue;
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}
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if (numBits >= 31)
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{
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idx = FindUshort(ptr, beginBit, endBit, numBits);
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if (idx != endBit)
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{
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return idx;
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}
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}
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if (numBits >= 64)
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{
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// early out - no smaller step will find this gap
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return int.MaxValue;
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}
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idx = FindByte(ptr, beginBit, endBit, numBits);
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if (idx != endBit)
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{
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return idx;
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}
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if (numBits < 15)
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{
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idx = FindUpto14bits(ptr, beginBit, endBit, numBits);
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if (idx != endBit)
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{
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return idx;
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}
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if (numBits < 7)
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{
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// The worst case scenario when every byte boundary bit is set (pattern 0x81),
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// and we're looking for 6 or less bits. It will rescan byte-by-byte to find
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// any inner byte gap.
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idx = FindUpto6bits(ptr, beginBit, endBit, numBits);
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if (idx != endBit)
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{
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return idx;
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}
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}
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}
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return int.MaxValue;
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}
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internal static int Find(ulong* ptr, int pos, int count, int numBits) => FindWithBeginEnd(ptr, pos, pos + count, numBits);
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}
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/// <summary>
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/// A 32-bit array of bits.
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/// </summary>
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/// <remarks>
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/// Stack allocated, so it does not require thread safety checks or disposal.
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/// </remarks>
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[DebuggerTypeProxy(typeof(BitField32DebugView))]
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[BurstCompatible]
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public struct BitField32
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{
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/// <summary>
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/// The 32 bits, stored as a uint.
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/// </summary>
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/// <value>The 32 bits, stored as a uint.</value>
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public uint Value;
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/// <summary>
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/// Initializes and returns an instance of BitField32.
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/// </summary>
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/// <param name="initialValue">Initial value of the bit field. Default is 0.</param>
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public BitField32(uint initialValue = 0u)
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{
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Value = initialValue;
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}
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/// <summary>
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/// Clears all the bits to 0.
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/// </summary>
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public void Clear()
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{
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Value = 0u;
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}
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/// <summary>
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/// Sets a single bit to 1 or 0.
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/// </summary>
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/// <param name="pos">Position in this bit field to set (must be 0-31).</param>
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/// <param name="value">If true, sets the bit to 1. If false, sets the bit to 0.</param>
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/// <exception cref="ArgumentException">Thrown if `pos`is out of range.</exception>
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public void SetBits(int pos, bool value)
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{
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CheckArgs(pos, 1);
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Value = Bitwise.SetBits(Value, pos, 1, value);
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}
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/// <summary>
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/// Sets one or more contiguous bits to 1 or 0.
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/// </summary>
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/// <param name="pos">Position in the bit field of the first bit to set (must be 0-31).</param>
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/// <param name="value">If true, sets the bits to 1. If false, sets the bits to 0.</param>
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/// <param name="numBits">Number of bits to set (must be 1-32).</param>
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/// <exception cref="ArgumentException">Thrown if `pos` or `numBits` are out of bounds or if `pos + numBits` exceeds 32.</exception>
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public void SetBits(int pos, bool value, int numBits)
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{
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CheckArgs(pos, numBits);
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var mask = 0xffffffffu >> (32 - numBits);
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Value = Bitwise.SetBits(Value, pos, mask, value);
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}
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/// <summary>
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/// Returns one or more contiguous bits from the bit field as the lower bits of a uint.
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/// </summary>
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/// <param name="pos">Position in the bit field of the first bit to get (must be 0-31).</param>
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/// <param name="numBits">Number of bits to get (must be 1-32).</param>
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/// <exception cref="ArgumentException">Thrown if `pos` or `numBits` are out of bounds or if `pos + numBits` exceeds 32.</exception>
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/// <returns>The requested range of bits from the bit field stored in the least-significant bits of a uint. All other bits of the uint will be 0.</returns>
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public uint GetBits(int pos, int numBits = 1)
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{
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CheckArgs(pos, numBits);
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var mask = 0xffffffffu >> (32 - numBits);
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return Bitwise.ExtractBits(Value, pos, mask);
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}
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/// <summary>
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/// Returns true if the bit at a position is 1.
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/// </summary>
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/// <param name="pos">Position in the bit field (must be 0-31).</param>
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/// <returns>True if the bit at the position is 1.</returns>
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public bool IsSet(int pos)
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{
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return 0 != GetBits(pos);
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}
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/// <summary>
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/// Returns true if none of the bits in a contiguous range are 1.
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/// </summary>
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/// <param name="pos">Position in the bit field (must be 0-31).</param>
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/// <param name="numBits">Number of bits to test (must be 1-32).</param>
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/// <exception cref="ArgumentException">Thrown if `pos` or `numBits` are out of bounds or if `pos + numBits` exceeds 32.</exception>
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/// <returns>True if none of the bits in the contiguous range are 1.</returns>
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public bool TestNone(int pos, int numBits = 1)
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{
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return 0u == GetBits(pos, numBits);
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}
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/// <summary>
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/// Returns true if any of the bits in a contiguous range are 1.
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/// </summary>
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/// <param name="pos">Position in the bit field (must be 0-31).</param>
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/// <param name="numBits">Number of bits to test (must be 1-32).</param>
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/// <exception cref="ArgumentException">Thrown if `pos` or `numBits` are out of bounds or if `pos + numBits` exceeds 32.</exception>
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/// <returns>True if at least one bit in the contiguous range is 1.</returns>
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public bool TestAny(int pos, int numBits = 1)
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{
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return 0u != GetBits(pos, numBits);
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}
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/// <summary>
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/// Returns true if all of the bits in a contiguous range are 1.
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/// </summary>
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/// <param name="pos">Position in the bit field (must be 0-31).</param>
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/// <param name="numBits">Number of bits to test (must be 1-32).</param>
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/// <exception cref="ArgumentException">Thrown if `pos` or `numBits` are out of bounds or if `pos + numBits` exceeds 32.</exception>
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/// <returns>True if all bits in the contiguous range are 1.</returns>
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public bool TestAll(int pos, int numBits = 1)
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{
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CheckArgs(pos, numBits);
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var mask = 0xffffffffu >> (32 - numBits);
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return mask == Bitwise.ExtractBits(Value, pos, mask);
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|
}
|
|
|
|
/// <summary>
|
|
/// Returns the number of bits that are 1.
|
|
/// </summary>
|
|
/// <returns>The number of bits that are 1.</returns>
|
|
public int CountBits()
|
|
{
|
|
return math.countbits(Value);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns the number of leading zeroes.
|
|
/// </summary>
|
|
/// <returns>The number of leading zeros.</returns>
|
|
public int CountLeadingZeros()
|
|
{
|
|
return math.lzcnt(Value);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns the number of trailing zeros.
|
|
/// </summary>
|
|
/// <returns>The number of trailing zeros.</returns>
|
|
public int CountTrailingZeros()
|
|
{
|
|
return math.tzcnt(Value);
|
|
}
|
|
|
|
[Conditional("ENABLE_UNITY_COLLECTIONS_CHECKS")]
|
|
static void CheckArgs(int pos, int numBits)
|
|
{
|
|
if (pos > 31
|
|
|| numBits == 0
|
|
|| numBits > 32
|
|
|| pos + numBits > 32)
|
|
{
|
|
throw new ArgumentException($"BitField32 invalid arguments: pos {pos} (must be 0-31), numBits {numBits} (must be 1-32).");
|
|
}
|
|
}
|
|
}
|
|
|
|
sealed class BitField32DebugView
|
|
{
|
|
BitField32 BitField;
|
|
|
|
public BitField32DebugView(BitField32 bitfield)
|
|
{
|
|
BitField = bitfield;
|
|
}
|
|
|
|
public bool[] Bits
|
|
{
|
|
get
|
|
{
|
|
var array = new bool[32];
|
|
for (int i = 0; i < 32; ++i)
|
|
{
|
|
array[i] = BitField.IsSet(i);
|
|
}
|
|
return array;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// <summary>
|
|
/// A 64-bit array of bits.
|
|
/// </summary>
|
|
/// <remarks>
|
|
/// Stack allocated, so it does not require thread safety checks or disposal.
|
|
/// </remarks>
|
|
[DebuggerTypeProxy(typeof(BitField64DebugView))]
|
|
[BurstCompatible]
|
|
public struct BitField64
|
|
{
|
|
/// <summary>
|
|
/// The 64 bits, stored as a ulong.
|
|
/// </summary>
|
|
/// <value>The 64 bits, stored as a uint.</value>
|
|
public ulong Value;
|
|
|
|
/// <summary>
|
|
/// Initializes and returns an instance of BitField64.
|
|
/// </summary>
|
|
/// <param name="initialValue">Initial value of the bit field. Default is 0.</param>
|
|
public BitField64(ulong initialValue = 0ul)
|
|
{
|
|
Value = initialValue;
|
|
}
|
|
|
|
/// <summary>
|
|
/// Clears all bits to 0.
|
|
/// </summary>
|
|
public void Clear()
|
|
{
|
|
Value = 0ul;
|
|
}
|
|
/// <summary>
|
|
/// Sets a single bit to 1 or 0.
|
|
/// </summary>
|
|
/// <param name="pos">Position in this bit field to set (must be 0-63).</param>
|
|
/// <param name="value">If true, sets the bit to 1. If false, sets the bit to 0.</param>
|
|
/// <exception cref="ArgumentException">Thrown if `pos`is out of range.</exception>
|
|
public void SetBits(int pos, bool value)
|
|
{
|
|
CheckArgs(pos, 1);
|
|
Value = Bitwise.SetBits(Value, pos, 1, value);
|
|
}
|
|
|
|
|
|
/// <summary>
|
|
/// Sets one or more contiguous bits to 1 or 0.
|
|
/// </summary>
|
|
/// <param name="pos">Position in the bit field of the first bit to set (must be 0-63).</param>
|
|
/// <param name="value">If true, sets the bits to 1. If false, sets the bits to 0.</param>
|
|
/// <param name="numBits">Number of bits to set (must be 1-64).</param>
|
|
/// <exception cref="ArgumentException">Thrown if `pos` or `numBits` are out of bounds or if `pos + numBits` exceeds 64.</exception>
|
|
public void SetBits(int pos, bool value, int numBits = 1)
|
|
{
|
|
CheckArgs(pos, numBits);
|
|
var mask = 0xfffffffffffffffful >> (64 - numBits);
|
|
Value = Bitwise.SetBits(Value, pos, mask, value);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns one or more contiguous bits from the bit field as the lower bits of a ulong.
|
|
/// </summary>
|
|
/// <param name="pos">Position in the bit field of the first bit to get (must be 0-63).</param>
|
|
/// <param name="numBits">Number of bits to get (must be 1-64).</param>
|
|
/// <exception cref="ArgumentException">Thrown if `pos` or `numBits` are out of bounds or if `pos + numBits` exceeds 64.</exception>
|
|
/// <returns>The requested range of bits from the bit field stored in the least-significant bits of a ulong. All other bits of the ulong will be 0.</returns>
|
|
public ulong GetBits(int pos, int numBits = 1)
|
|
{
|
|
CheckArgs(pos, numBits);
|
|
var mask = 0xfffffffffffffffful >> (64 - numBits);
|
|
return Bitwise.ExtractBits(Value, pos, mask);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns true if the bit at a position is 1.
|
|
/// </summary>
|
|
/// <param name="pos">Position in the bit field (must be 0-63).</param>
|
|
/// <returns>True if the bit at the position is 1.</returns>
|
|
public bool IsSet(int pos)
|
|
{
|
|
return 0ul != GetBits(pos);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns true if none of the bits in a contiguous range are 1.
|
|
/// </summary>
|
|
/// <param name="pos">Position in the bit field (must be 0-63).</param>
|
|
/// <param name="numBits">Number of bits to test (must be 1-64).</param>
|
|
/// <exception cref="ArgumentException">Thrown if `pos` or `numBits` are out of bounds or if `pos + numBits` exceeds 64.</exception>
|
|
/// <returns>True if none of the bits in the contiguous range are 1.</returns>
|
|
public bool TestNone(int pos, int numBits = 1)
|
|
{
|
|
return 0ul == GetBits(pos, numBits);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns true if any of the bits in a contiguous range are 1.
|
|
/// </summary>
|
|
/// <param name="pos">Position in the bit field (must be 0-63).</param>
|
|
/// <param name="numBits">Number of bits to test (must be 1-64).</param>
|
|
/// <exception cref="ArgumentException">Thrown if `pos` or `numBits` are out of bounds or if `pos + numBits` exceeds 64.</exception>
|
|
/// <returns>True if at least one bit in the contiguous range is 1.</returns>
|
|
public bool TestAny(int pos, int numBits = 1)
|
|
{
|
|
return 0ul != GetBits(pos, numBits);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns true if all of the bits in a contiguous range are 1.
|
|
/// </summary>
|
|
/// <param name="pos">Position in the bit field (must be 0-63).</param>
|
|
/// <param name="numBits">Number of bits to test (must be 1-64).</param>
|
|
/// <exception cref="ArgumentException">Thrown if `pos` or `numBits` are out of bounds or if `pos + numBits` exceeds 64.</exception>
|
|
/// <returns>True if all bits in the contiguous range are 1.</returns>
|
|
public bool TestAll(int pos, int numBits = 1)
|
|
{
|
|
CheckArgs(pos, numBits);
|
|
var mask = 0xfffffffffffffffful >> (64 - numBits);
|
|
return mask == Bitwise.ExtractBits(Value, pos, mask);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns the number of bits that are 1.
|
|
/// </summary>
|
|
/// <returns>The number of bits that are 1.</returns>
|
|
public int CountBits()
|
|
{
|
|
return math.countbits(Value);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns the number of leading zeroes.
|
|
/// </summary>
|
|
/// <returns>The number of leading zeros.</returns>
|
|
public int CountLeadingZeros()
|
|
{
|
|
return math.lzcnt(Value);
|
|
}
|
|
|
|
/// <summary>
|
|
/// Returns the number of trailing zeros.
|
|
/// </summary>
|
|
/// <returns>The number of trailing zeros.</returns>
|
|
public int CountTrailingZeros()
|
|
{
|
|
return math.tzcnt(Value);
|
|
}
|
|
|
|
[Conditional("ENABLE_UNITY_COLLECTIONS_CHECKS")]
|
|
static void CheckArgs(int pos, int numBits)
|
|
{
|
|
if (pos > 63
|
|
|| numBits == 0
|
|
|| numBits > 64
|
|
|| pos + numBits > 64)
|
|
{
|
|
throw new ArgumentException($"BitField32 invalid arguments: pos {pos} (must be 0-63), numBits {numBits} (must be 1-64).");
|
|
}
|
|
}
|
|
}
|
|
|
|
sealed class BitField64DebugView
|
|
{
|
|
BitField64 Data;
|
|
|
|
public BitField64DebugView(BitField64 data)
|
|
{
|
|
Data = data;
|
|
}
|
|
|
|
public bool[] Bits
|
|
{
|
|
get
|
|
{
|
|
var array = new bool[64];
|
|
for (int i = 0; i < 64; ++i)
|
|
{
|
|
array[i] = Data.IsSet(i);
|
|
}
|
|
return array;
|
|
}
|
|
}
|
|
}
|
|
}
|