00001 // 00002 // Copyright (c) 2005-2008 Kenichi Watanabe. 00003 // Copyright (c) 2005-2008 Yasuhiro Watari. 00004 // Copyright (c) 2005-2008 Hironori Ichibayashi. 00005 // Copyright (c) 2008-2009 Kazuo Horio. 00006 // Copyright (c) 2009-2013 Naruki Kurata. 00007 // Copyright (c) 2005-2013 Ryota Shioya. 00008 // Copyright (c) 2005-2013 Masahiro Goshima. 00009 // 00010 // This software is provided 'as-is', without any express or implied 00011 // warranty. In no event will the authors be held liable for any damages 00012 // arising from the use of this software. 00013 // 00014 // Permission is granted to anyone to use this software for any purpose, 00015 // including commercial applications, and to alter it and redistribute it 00016 // freely, subject to the following restrictions: 00017 // 00018 // 1. The origin of this software must not be misrepresented; you must not 00019 // claim that you wrote the original software. If you use this software 00020 // in a product, an acknowledgment in the product documentation would be 00021 // appreciated but is not required. 00022 // 00023 // 2. Altered source versions must be plainly marked as such, and must not be 00024 // misrepresented as being the original software. 00025 // 00026 // 3. This notice may not be removed or altered from any source 00027 // distribution. 00028 // 00029 // 00030 00031 00032 // 00033 // Counter based hit/miss predictor 00034 // 00035 00036 #ifndef SIM_PREDICTOR_HIT_MISS_PRED_COUNTER_BASED_HIT_MISS_PRED_H 00037 #define SIM_PREDICTOR_HIT_MISS_PRED_COUNTER_BASED_HIT_MISS_PRED_H 00038 00039 #include "Types.h" 00040 #include "Lib/shttl/counter_array.h" 00041 #include "Env/Param/ParamExchange.h" 00042 00043 #include "Sim/Foundation/Resource/ResourceNode.h" 00044 #include "Sim/Predictor/HitMissPred/HitMissPredIF.h" 00045 00046 namespace Onikiri 00047 { 00048 class CounterBasedHitMissPred : 00049 public HitMissPredIF, 00050 public PhysicalResourceNode 00051 { 00052 public: 00053 BEGIN_PARAM_MAP( GetParamPath() ) 00054 PARAM_ENTRY("@CounterBits", m_counterBits) 00055 PARAM_ENTRY("@EntryBits", m_entryBits) 00056 PARAM_ENTRY("@AddressXORConvolute", m_addrXORConvolute) 00057 END_PARAM_MAP() 00058 00059 BEGIN_RESOURCE_MAP() 00060 END_RESOURCE_MAP() 00061 00062 CounterBasedHitMissPred(); 00063 ~CounterBasedHitMissPred(); 00064 00065 void Initialize(InitPhase phase); 00066 00067 virtual bool Predict( OpIterator op ); 00068 virtual void Finished( OpIterator op, bool hit ){}; 00069 virtual void Commit( OpIterator op, bool hit ); 00070 00071 private: 00072 int m_counterBits; 00073 int m_entryBits; 00074 bool m_addrXORConvolute; 00075 shttl::counter_array<u8> m_table; 00076 00077 u64 ConvolutePCToArrayIndex(PC pc); 00078 u64 MaskPCToArrayIndex(PC pc); 00079 u64 GetArrayIndex(PC pc); 00080 }; 00081 00082 } // namespace Onikiri 00083 00084 #endif // SIM_PREDICTOR_HIT_MISS_PRED_COUNTER_BASED_HIT_MISS_PRED_H 00085