src/cpu/inorder/resources/use_def.hh

   1 /*
   2  * Copyright (c) 2007 MIPS Technologies, Inc.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are
   7  * met: redistributions of source code must retain the above copyright
   8  * notice, this list of conditions and the following disclaimer;
   9  * redistributions in binary form must reproduce the above copyright
  10  * notice, this list of conditions and the following disclaimer in the
  11  * documentation and/or other materials provided with the distribution;
  12  * neither the name of the copyright holders nor the names of its
  13  * contributors may be used to endorse or promote products derived from
  14  * this software without specific prior written permission.
  15  *
  16  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  17  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  18  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  19  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  20  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  21  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  22  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  *
  28  * Authors: Korey Sewell
  29  *
  30  */
  31
  32 #ifndef __CPU_INORDER_USE_DEF_UNIT_HH__
  33 #define __CPU_INORDER_USE_DEF_UNIT_HH__
  34
  35 #include <vector>
  36 #include <list>
  37 #include <string>
  38
  39 #include "cpu/func_unit.hh"
  40 #include "cpu/inorder/first_stage.hh"
  41 #include "cpu/inorder/resource.hh"
  42 #include "cpu/inorder/inorder_dyn_inst.hh"
  43 #include "cpu/inorder/pipeline_traits.hh"
  44 #include "cpu/inorder/reg_dep_map.hh"
  45
  46 class UseDefUnit : public Resource {
  47   public:
  48     typedef ThePipeline::DynInstPtr DynInstPtr;
  49
  50     enum Command {
  51         ReadSrcReg,
  52         WriteDestReg
  53     };
  54
  55   public:
  56     UseDefUnit(std::string res_name, int res_id, int res_width,
  57                int res_latency, InOrderCPU *_cpu, ThePipeline::Params *params);
  58     virtual ~UseDefUnit() {}
  59
  60     virtual ResourceRequest* getRequest(DynInstPtr _inst, int stage_num,
  61                                         int res_idx, int slot_num,
  62                                         unsigned cmd);
  63
  64     virtual ResReqPtr findRequest(DynInstPtr inst);
  65
  66     virtual void execute(int slot_num);
  67
  68     virtual void squash(DynInstPtr inst, int stage_num,
  69                         InstSeqNum squash_seq_num, ThreadID tid);
  70
  71     void updateAfterContextSwitch(DynInstPtr inst, ThreadID tid);
  72
  73     const InstSeqNum maxSeqNum;
  74
  75     void regStats();
  76
  77   protected:
  78     RegDepMap *regDepMap[ThePipeline::MaxThreads];
  79
  80     /** Outstanding Seq. Num. Trying to Read from Register File */
  81     InstSeqNum outReadSeqNum[ThePipeline::MaxThreads];
  82
  83     InstSeqNum outWriteSeqNum[ThePipeline::MaxThreads];
  84
  85     bool *nonSpecInstActive[ThePipeline::MaxThreads];
  86
  87     InstSeqNum *nonSpecSeqNum[ThePipeline::MaxThreads];
  88
  89     InstSeqNum floatRegSize[ThePipeline::MaxThreads];
  90
  91     Stats::Average uniqueRegsPerSwitch;
  92     std::map<unsigned, bool> uniqueRegMap;
  93
  94   public:
  95     class UseDefRequest : public ResourceRequest {
  96       public:
  97         typedef ThePipeline::DynInstPtr DynInstPtr;
  98
  99       public:
 100         UseDefRequest(UseDefUnit *res, DynInstPtr inst, int stage_num,
 101                       int res_idx, int slot_num, unsigned cmd,
 102                       int use_def_idx)
 103             : ResourceRequest(res, inst, stage_num, res_idx, slot_num, cmd),
 104               useDefIdx(use_def_idx)
 105         { }
 106
 107         int useDefIdx;
 108     };
 109
 110   protected:
 111     /** Register File Reads */
 112     Stats::Scalar regFileReads;
 113
 114     /** Register File Writes */
 115     Stats::Scalar regFileWrites;
 116
 117     /** Source Register Forwarding */
 118     Stats::Scalar regForwards;
 119
 120     /** Register File Total Accesses (Read+Write) */
 121     Stats::Formula regFileAccs;
 122 };
 123
 124 #endif //__CPU_INORDER_USE_DEF_UNIT_HH__