src/cpu/inorder/resources/mult_div_unit.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_MULT_DIV_UNIT_HH__
  33 #define __CPU_INORDER_MULT_DIV_UNIT_HH__
  34
  35 #include <vector>
  36 #include <list>
  37 #include <string>
  38
  39 #include "cpu/func_unit.hh"
  40 #include "cpu/op_class.hh"
  41 #include "cpu/inorder/first_stage.hh"
  42 #include "cpu/inorder/resource.hh"
  43 #include "cpu/inorder/inorder_dyn_inst.hh"
  44
  45 class MDUEvent;
  46
  47 class MultDivUnit : public Resource {
  48   public:
  49     typedef ThePipeline::DynInstPtr DynInstPtr;
  50
  51     enum Command {
  52         StartMultDiv,
  53         EndMultDiv,
  54         MultDiv
  55     };
  56
  57   public:
  58     MultDivUnit(std::string res_name, int res_id, int res_width,
  59               int res_latency, InOrderCPU *_cpu, ThePipeline::Params *params);
  60     virtual ~MultDivUnit() {}
  61
  62   public:
  63     /** Override default Resource getSlot(). Will only getSlot if
  64      *  valid mult/div sequence is being maintained
  65      */
  66     virtual int getSlot(DynInstPtr inst);
  67
  68     virtual int findSlot(DynInstPtr inst);
  69
  70     virtual void freeSlot(int slot_idx);
  71
  72     virtual void init();
  73
  74     /** Get Operand Size For A Division Operation */
  75     int getDivOpSize(DynInstPtr inst);
  76
  77     /** Override default Resource execute */
  78     virtual void execute(int slot_num);
  79
  80     void exeMulDiv(int slot_num);
  81
  82     /** Register extra resource stats */
  83     virtual void regStats();
  84
  85     void requestAgain(DynInstPtr inst, bool &try_request);
  86
  87   protected:
  88     /** Latency & Repeat Rate for Multiply Insts */
  89     unsigned multRepeatRate;
  90     unsigned multLatency;
  91
  92     /** Latency & Repeat Rate for 8-bit Divide Insts */
  93     unsigned div8RepeatRate;
  94     unsigned div8Latency;
  95
  96     /** Latency & Repeat Rate for 16-bit Divide Insts */
  97     unsigned div16RepeatRate;
  98     unsigned div16Latency;
  99
 100     /** Latency & Repeat Rate for 24-bit Divide Insts */
 101     unsigned div24RepeatRate;
 102     unsigned div24Latency;
 103
 104     /** Latency & Repeat Rate for 32-bit Divide Insts */
 105     unsigned div32RepeatRate;
 106     unsigned div32Latency;
 107
 108     /** Last cycle that MDU was used */
 109     Tick lastMDUCycle;
 110
 111     /** Last type of instruction MDU started processing */
 112     OpClass lastOpType;
 113
 114     /** Last Division Operand of instruction MDU was processing */
 115     uint32_t lastDivSize;
 116
 117     /** Last instruction name the MDU used */
 118     std::string lastInstName;
 119
 120     /** Number of Instruction Requests the Resource Processes */
 121     Stats::Scalar multInstReqsProcessed;
 122
 123     /** Number of Instruction Requests the Resource Processes */
 124     Stats::Scalar divInstReqsProcessed;
 125
 126     MDUEvent *mduEvent;
 127 };
 128
 129 class MDUEvent : public ResourceEvent
 130 {
 131   public:
 132     MDUEvent();
 133     virtual ~MDUEvent() { }
 134
 135
 136     virtual void process();
 137 };
 138
 139
 140 #endif //__CPU_INORDER_MULT_DIV_UNIT_HH__