scoreboard.hh

Go to the documentation of this file.

/*
 * Copyright (c) 2013-2014, 2016-2017 ARM Limited
 * All rights reserved
 *
 * The license below extends only to copyright in the software and shall
 * not be construed as granting a license to any other intellectual
 * property including but not limited to intellectual property relating
 * to a hardware implementation of the functionality of the software
 * licensed hereunder.  You may use the software subject to the license
 * terms below provided that you ensure that this notice is replicated
 * unmodified and in its entirety in all distributions of the software,
 * modified or unmodified, in source code or in binary form.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer;
 * redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
#ifndef __CPU_MINOR_SCOREBOARD_HH__
#define __CPU_MINOR_SCOREBOARD_HH__
 
#include "cpu/minor/cpu.hh"
#include "cpu/minor/dyn_inst.hh"
#include "cpu/minor/trace.hh"
 
namespace Minor
{
 
class Scoreboard : public Named
{
  public:
    const unsigned numRegs;
 
    typedef unsigned short int Index;
 
    std::vector<Index> numResults;
 
    std::vector<Index> numUnpredictableResults;
 
    std::vector<int> fuIndices;
 
    std::vector<Cycles> returnCycle;
 
    std::vector<InstSeqNum> writingInst;
 
  public:
    Scoreboard(const std::string &name) :
        Named(name),
        numRegs(TheISA::NumIntRegs + TheISA::NumCCRegs +
            TheISA::NumFloatRegs +
            (TheISA::NumVecRegs * TheISA::NumVecElemPerVecReg) +
            TheISA::NumVecPredRegs),
        numResults(numRegs, 0),
        numUnpredictableResults(numRegs, 0),
        fuIndices(numRegs, 0),
        returnCycle(numRegs, Cycles(0)),
        writingInst(numRegs, 0)
    { }
 
  public:
    bool findIndex(const RegId& reg, Index &scoreboard_index);
 
    void markupInstDests(MinorDynInstPtr inst, Cycles retire_time,
        ThreadContext *thread_context, bool mark_unpredictable);
 
    void clearInstDests(MinorDynInstPtr inst, bool clear_unpredictable);
 
    InstSeqNum execSeqNumToWaitFor(MinorDynInstPtr inst,
        ThreadContext *thread_context);
 
    bool canInstIssue(MinorDynInstPtr inst,
        const std::vector<Cycles> *src_reg_relative_latencies,
        const std::vector<bool> *cant_forward_from_fu_indices,
        Cycles now, ThreadContext *thread_context);
 
    void minorTrace() const;
};
 
}
 
#endif /* __CPU_MINOR_SCOREBOARD_HH__ */