106 lines
3.5 KiB
Plaintext
106 lines
3.5 KiB
Plaintext
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="HLSFAllocator.Level.cs"
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// Project: StgSharp
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// AuthorGroup: Nitload Space
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// Copyright (c) Nitload Space. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person
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// obtaining a copy of this software and associated documentation
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// files (the “Software”), to deal in the Software without restriction,
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// including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software,
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// and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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//
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// The above copyright notice and
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// this permission notice shall be included in all copies
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// or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED “AS IS”,
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// WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH
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// THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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// -----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Numerics;
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using System.Runtime.CompilerServices;
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using System.Text;
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using System.Threading.Tasks;
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namespace StgSharp.HighPerformance.Memory
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{
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public unsafe partial class HybridLayerSegregatedFitAllocator
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{
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private const int MaxLevel = 9;
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private static readonly int[] levelSize = [
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64, 256, 1024, 4096, 16384, 65536, 262144, 1048576, 4194304, 16777216
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];
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public int AlignOfLevel(int bucketLevel)
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{
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int blockSize = levelSize[bucketLevel];
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return int.Min(blockSize, _align);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private int GetLevelFromSize(uint size)
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{
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// Ensure minimum size
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if (size <= 64)
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{
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return 0;
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}
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/*
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* size = 64 * 4 ^ level
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* level = Log4(size/64)
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* level = Log4(size) - Log4(64)
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* level = Log4(size) - 3
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* Log4 is the same as count of >>=2 or /= 4;
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*/
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int level = -3;
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while (size > 0)
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{
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level++;
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size >>= 2;
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}
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return level;
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// Find the position of the highest set bit (equivalent to floor(log2(size)))
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int msb = 31 - System.Numerics.BitOperations.LeadingZeroCount(size);
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// Convert MSB position to level index using bit manipulation
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// MSB: 6->0, 7->0, 8->1, 9->1, 10->2, 11->2, 12->3, 13->3, etc.
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// Pattern: level = max(0, (msb - 6) >> 1)
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int level = Math.Max(0, (msb - 6) >> 1);
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// Clamp to valid range
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return Math.Min(level, levelSize.Length - 1);
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}
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}
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public enum CommonMemoryAlign : int
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{
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XMMLevel = 16,
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YMMLevel = 32,
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ZMMLevel = 64,
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ArmNEONLevel = 16,
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}
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}
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