92 lines
3.3 KiB
C#
92 lines
3.3 KiB
C#
//-----------------------------------------------------------------------
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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[] levelSizeArray = [
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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 = levelSizeArray[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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/*
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* Level sizes: [64, 256, 1024, 4096, 16384, 65536, 262144, 1048576, 4194304, 16777216]
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* Pattern: 64 * 4^level = 2^6 * 2^(2*level) = 2^(6+2*level)
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*
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* For size S, we need: 2^(6+2*level) >= S
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* So: 6+2*level >= log2(S)
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* Therefore: level >= (log2(S) - 6) / 2
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*
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* We use hardware LZCNT instruction via BitOperations.LeadingZeroCount
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* log2(S) = 31 - LeadingZeroCount(S) for 32-bit values
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*/
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int log2Size = 31 - BitOperations.LeadingZeroCount(size);
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// Calculate level: level = max(0, (log2Size - 6) / 2)
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int level = Math.Max(0, (log2Size - 6) / 2);
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// caller is responsible for ensuring level is within bounds
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return level;
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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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