142 lines
5.2 KiB
C#
142 lines
5.2 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="HLSFAllocator.Level"
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// Project: StgSharp
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// AuthorGroup: Nitload
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// Copyright (c) Nitload. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// 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.Net.Security;
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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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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private nuint GetAllocSize(
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nuint size
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)
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{
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return (size + 63u) & (~63u);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private int GetBucketIndexOnce(
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nuint size
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)
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{
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int log2Size = 63 - BitOperations.LeadingZeroCount((ulong)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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level = Math.Min(level, _maxLevel);
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uint levelSize = 1u << (log2Size & (~1));
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int segment = ((int)(size / levelSize)) - 1;
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return (level * 3) + segment;
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private (int level, int segment) GetIndexPairOnce(
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nuint size
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)
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{
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int log2Size = 63 - BitOperations.LeadingZeroCount((ulong)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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level = Math.Min(level, _maxLevel);
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uint levelSize = 1u << (log2Size & (~1));
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int segment = ((int)(size / levelSize)) - 1;
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return (level, segment);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private int GetLevelFromSize(
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nuint size
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)
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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) = 63 - LeadingZeroCount(S) for 64-bit values
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*/
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int log2Size = 63 - BitOperations.LeadingZeroCount((ulong)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 Math.Min(level, _maxLevel);
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static uint GetLevelSizeFromLevel(
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int level
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)
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{
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return 1u << (6 + (2 * level));
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}
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private static uint GetLevelSizeFromSize(
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nuint size
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)
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{
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int log2Size = 63 - BitOperations.LeadingZeroCount((ulong)size);
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return 1u << (log2Size & (~1));
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}
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/// <summary>
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/// Determine segment index based on size and originLevel. Input level value is regarded
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/// safe.
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/// </summary>
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[MethodImpl(MethodImplOptions.AggressiveInlining)]
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private int GetSegmentFromLevel(
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ulong size,
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int level
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)
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{
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return ((int)(size / GetLevelSizeFromLevel(level))) - 1;
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}
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}
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}
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