92 lines
3.5 KiB
C#
92 lines
3.5 KiB
C#
//-----------------------------------------------------------------------
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// -----------------------------------------------------------------------
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// file="L4.Prefetch"
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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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namespace StgSharp.HighPerformance.Memory
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{
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public unsafe partial class L4
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{
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private partial void Prefetch()
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{
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if (PrefetchPredict is null) {
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return;
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}
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Span<CacheLinePrediction> span = new(_prediction, PredictionCount);
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int actualCount = PrefetchPredict.Predict(span);
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int missIndex = 0;
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AgeAll();
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for (int i = 0; i < actualCount; i++)
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{
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ref CacheLinePrediction handle = ref span[i];
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nuint address = handle.Address;
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if (!TestHit(address))
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{
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// miss and record
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span[missIndex] = handle;
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missIndex++;
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}
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}
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// now prefetch the misses
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for (int i = 0; i < missIndex; i++)
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{
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ref CacheLinePrediction handle = ref span[i];
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nuint address = handle.Address;
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if (TestHit(address))
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{
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continue;
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}
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// TODO 未经初始化的_idMux可能会导致TryGetEmptyLine失败，导致无法预取，最好添加末尾指针计数
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if (!TryGetEmptyLine(out int index))
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{
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throw new OverflowException("L4 has no empty cache line.");
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}
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CacheLineHead* head = &_head[index];
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// pre fetch them here
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_ = PrefetchPredict.Prefetch(head->_origin, head->_profile, head->_address);
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}
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}
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private partial bool TestHit(
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nuint origin
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)
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{
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if (_map.TryGet(origin, out nuint handle))
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{
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CacheLineHead* head = (CacheLineHead*)handle;
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int index = head->_id;
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(*_eviction)[index] = 0; // reset eviction counter
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return true;
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}
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return false;
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}
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}
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}
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