regfile.hh

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/*
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 * licensed hereunder. You may use the software subject to the license
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 * Copyright (c) 2004-2005 The Regents of The University of Michigan
 * Copyright (c) 2013 Advanced Micro Devices, Inc.
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 * modification, are permitted provided that the following conditions are
 * met: redistributions of source code must retain the above copyright
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 * this software without specific prior written permission.
 *
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 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * Authors: Kevin Lim
 *          Gabe Black
 */

#ifndef __CPU_O3_REGFILE_HH__
#define __CPU_O3_REGFILE_HH__

#include <vector>

#include "arch/isa_traits.hh"
#include "arch/types.hh"
#include "base/trace.hh"
#include "config/the_isa.hh"
#include "cpu/o3/comm.hh"
#include "debug/IEW.hh"
#include "enums/VecRegRenameMode.hh"

class UnifiedFreeList;

class PhysRegFile
{
  private:

    using VecElem = TheISA::VecElem;
    using VecRegContainer = TheISA::VecRegContainer;
    using PhysIds = std::vector<PhysRegId>;
    using VecMode = Enums::VecRegRenameMode;
    using VecPredRegContainer = TheISA::VecPredRegContainer;
  public:
    using IdRange = std::pair<PhysIds::iterator,
                              PhysIds::iterator>;
  private:
    static constexpr auto NumVecElemPerVecReg = TheISA::NumVecElemPerVecReg;

    std::vector<RegVal> intRegFile;
    std::vector<PhysRegId> intRegIds;

    std::vector<RegVal> floatRegFile;
    std::vector<PhysRegId> floatRegIds;

    std::vector<VecRegContainer> vectorRegFile;
    std::vector<PhysRegId> vecRegIds;
    std::vector<PhysRegId> vecElemIds;

    std::vector<VecPredRegContainer> vecPredRegFile;
    std::vector<PhysRegId> vecPredRegIds;

    std::vector<RegVal> ccRegFile;
    std::vector<PhysRegId> ccRegIds;

    std::vector<PhysRegId> miscRegIds;

    unsigned numPhysicalIntRegs;

    unsigned numPhysicalFloatRegs;

    unsigned numPhysicalVecRegs;

    unsigned numPhysicalVecElemRegs;

    unsigned numPhysicalVecPredRegs;

    unsigned numPhysicalCCRegs;

    unsigned totalNumRegs;

    VecMode vecMode;

  public:
    PhysRegFile(unsigned _numPhysicalIntRegs,
                unsigned _numPhysicalFloatRegs,
                unsigned _numPhysicalVecRegs,
                unsigned _numPhysicalVecPredRegs,
                unsigned _numPhysicalCCRegs,
                VecMode vmode
                );

    ~PhysRegFile() {}

    void initFreeList(UnifiedFreeList *freeList);

    unsigned numIntPhysRegs() const { return numPhysicalIntRegs; }

    unsigned numFloatPhysRegs() const { return numPhysicalFloatRegs; }
    unsigned numVecPhysRegs() const { return numPhysicalVecRegs; }
    unsigned numPredPhysRegs() const { return numPhysicalVecPredRegs; }

    unsigned numVecElemPhysRegs() const { return numPhysicalVecElemRegs; }

    unsigned numCCPhysRegs() const { return numPhysicalCCRegs; }

    unsigned totalNumPhysRegs() const { return totalNumRegs; }

    PhysRegIdPtr getMiscRegId(RegIndex reg_idx) {
        return &miscRegIds[reg_idx];
    }

    RegVal
    readIntReg(PhysRegIdPtr phys_reg) const
    {
        assert(phys_reg->isIntPhysReg());

        DPRINTF(IEW, "RegFile: Access to int register %i, has data "
                "%#x\n", phys_reg->index(), intRegFile[phys_reg->index()]);
        return intRegFile[phys_reg->index()];
    }

    RegVal
    readFloatReg(PhysRegIdPtr phys_reg) const
    {
        assert(phys_reg->isFloatPhysReg());

        RegVal floatRegBits = floatRegFile[phys_reg->index()];

        DPRINTF(IEW, "RegFile: Access to float register %i as int, "
                "has data %#x\n", phys_reg->index(), floatRegBits);

        return floatRegBits;
    }

    const VecRegContainer &
    readVecReg(PhysRegIdPtr phys_reg) const
    {
        assert(phys_reg->isVectorPhysReg());

        DPRINTF(IEW, "RegFile: Access to vector register %i, has "
                "data %s\n", int(phys_reg->index()),
                vectorRegFile[phys_reg->index()].print());

        return vectorRegFile[phys_reg->index()];
    }

    VecRegContainer &
    getWritableVecReg(PhysRegIdPtr phys_reg)
    {
        /* const_cast for not duplicating code above. */
        return const_cast<VecRegContainer&>(readVecReg(phys_reg));
    }

    template <typename VecElem, int LaneIdx>
    VecLaneT<VecElem, true>
    readVecLane(PhysRegIdPtr phys_reg) const
    {
        return readVecReg(phys_reg).laneView<VecElem, LaneIdx>();
    }

    template <typename VecElem>
    VecLaneT<VecElem, true>
    readVecLane(PhysRegIdPtr phys_reg) const
    {
        return readVecReg(phys_reg).laneView<VecElem>(phys_reg->elemIndex());
    }

    template <typename LD>
    void
    setVecLane(PhysRegIdPtr phys_reg, const LD& val)
    {
        assert(phys_reg->isVectorPhysReg());

        DPRINTF(IEW, "RegFile: Setting vector register %i[%d] to %lx\n",
                int(phys_reg->index()), phys_reg->elemIndex(), val);

        vectorRegFile[phys_reg->index()].laneView<typename LD::UnderlyingType>(
                phys_reg->elemIndex()) = val;
    }

    const VecElem &
    readVecElem(PhysRegIdPtr phys_reg) const
    {
        assert(phys_reg->isVectorPhysElem());
        auto ret = vectorRegFile[phys_reg->index()].as<VecElem>();
        const VecElem& val = ret[phys_reg->elemIndex()];
        DPRINTF(IEW, "RegFile: Access to element %d of vector register %i,"
                " has data %#x\n", phys_reg->elemIndex(),
                int(phys_reg->index()), val);

        return val;
    }

    const VecPredRegContainer& readVecPredReg(PhysRegIdPtr phys_reg) const
    {
        assert(phys_reg->isVecPredPhysReg());

        DPRINTF(IEW, "RegFile: Access to predicate register %i, has "
                "data %s\n", int(phys_reg->index()),
                vecPredRegFile[phys_reg->index()].print());

        return vecPredRegFile[phys_reg->index()];
    }

    VecPredRegContainer& getWritableVecPredReg(PhysRegIdPtr phys_reg)
    {
        /* const_cast for not duplicating code above. */
        return const_cast<VecPredRegContainer&>(readVecPredReg(phys_reg));
    }

    RegVal
    readCCReg(PhysRegIdPtr phys_reg)
    {
        assert(phys_reg->isCCPhysReg());

        DPRINTF(IEW, "RegFile: Access to cc register %i, has "
                "data %#x\n", phys_reg->index(),
                ccRegFile[phys_reg->index()]);

        return ccRegFile[phys_reg->index()];
    }

    void
    setIntReg(PhysRegIdPtr phys_reg, RegVal val)
    {
        assert(phys_reg->isIntPhysReg());

        DPRINTF(IEW, "RegFile: Setting int register %i to %#x\n",
                phys_reg->index(), val);

        if (!phys_reg->isZeroReg())
            intRegFile[phys_reg->index()] = val;
    }

    void
    setFloatReg(PhysRegIdPtr phys_reg, RegVal val)
    {
        assert(phys_reg->isFloatPhysReg());

        DPRINTF(IEW, "RegFile: Setting float register %i to %#x\n",
                phys_reg->index(), (uint64_t)val);

        if (!phys_reg->isZeroReg())
            floatRegFile[phys_reg->index()] = val;
    }

    void
    setVecReg(PhysRegIdPtr phys_reg, const VecRegContainer& val)
    {
        assert(phys_reg->isVectorPhysReg());

        DPRINTF(IEW, "RegFile: Setting vector register %i to %s\n",
                int(phys_reg->index()), val.print());

        vectorRegFile[phys_reg->index()] = val;
    }

    void
    setVecElem(PhysRegIdPtr phys_reg, const VecElem val)
    {
        assert(phys_reg->isVectorPhysElem());

        DPRINTF(IEW, "RegFile: Setting element %d of vector register %i to"
                " %#x\n", phys_reg->elemIndex(), int(phys_reg->index()), val);

        vectorRegFile[phys_reg->index()].as<VecElem>()[phys_reg->elemIndex()] =
                val;
    }

    void setVecPredReg(PhysRegIdPtr phys_reg, const VecPredRegContainer& val)
    {
        assert(phys_reg->isVecPredPhysReg());

        DPRINTF(IEW, "RegFile: Setting predicate register %i to %s\n",
                int(phys_reg->index()), val.print());

        vecPredRegFile[phys_reg->index()] = val;
    }

    void
    setCCReg(PhysRegIdPtr phys_reg, RegVal val)
    {
        assert(phys_reg->isCCPhysReg());

        DPRINTF(IEW, "RegFile: Setting cc register %i to %#x\n",
                phys_reg->index(), (uint64_t)val);

        ccRegFile[phys_reg->index()] = val;
    }

    IdRange getRegElemIds(PhysRegIdPtr reg);

    IdRange getRegIds(RegClass cls);

    PhysRegIdPtr getTrueId(PhysRegIdPtr reg);
};


#endif //__CPU_O3_REGFILE_HH__