src/cpu/inorder/resources/decode_unit.cc

   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 #include "config/the_isa.hh"
  33 #include "cpu/inorder/resources/decode_unit.hh"
  34 #include "debug/InOrderDecode.hh"
  35 #include "debug/InOrderStall.hh"
  36 #include "debug/Resource.hh"
  37
  38 using namespace TheISA;
  39 using namespace ThePipeline;
  40 using namespace std;
  41
  42 DecodeUnit::DecodeUnit(std::string res_name, int res_id, int res_width,
  43                        int res_latency, InOrderCPU *_cpu,
  44                        ThePipeline::Params *params)
  45     : Resource(res_name, res_id, res_width, res_latency, _cpu)
  46 {
  47     for (ThreadID tid = 0; tid < MaxThreads; tid++) {
  48         regDepMap[tid] = &cpu->archRegDepMap[tid];
  49     }
  50 }
  51
  52 void
  53 DecodeUnit::execute(int slot_num)
  54 {
  55     ResourceRequest* decode_req = reqs[slot_num];
  56     DynInstPtr inst = reqs[slot_num]->inst;
  57
  58     switch (decode_req->cmd)
  59     {
  60       case DecodeInst:
  61         {
  62
  63             if (inst->fault != NoFault) {
  64                 inst->setBackSked(cpu->faultSked);
  65                 DPRINTF(InOrderDecode,"[tid:%i]: Fault found for instruction [sn:%i]\n",
  66                         inst->readTid(), inst->seqNum);
  67             } else {
  68                 assert(!inst->staticInst->isMacroop());
  69                 inst->setBackSked(cpu->createBackEndSked(inst));
  70                 DPRINTF(InOrderDecode,"Decoded instruction [sn:%i]: %s : 0x%x\n",
  71                         inst->seqNum, inst->instName(),
  72                         inst->staticInst->machInst);
  73             }
  74
  75             if (inst->backSked != NULL) {
  76                 DPRINTF(InOrderDecode,
  77                     "[tid:%i]: Back End Schedule created for %s  [sn:%i].\n",
  78                         inst->readTid(), inst->instName(), inst->seqNum);
  79                 decode_req->done();
  80             } else {
  81                 DPRINTF(Resource,
  82                     "[tid:%i] Static Inst not available to decode.\n",
  83                         inst->readTid());
  84                 DPRINTF(Resource,
  85                     "Unable to create schedule for instruction [sn:%i] \n",
  86                     inst->seqNum);
  87                 DPRINTF(InOrderStall, "STALL: \n");
  88                 decode_req->done(false);
  89             }
  90         }
  91         break;
  92
  93       default:
  94         fatal("Unrecognized command to %s", resName);
  95     }
  96 }
  97