gpu_static_inst.cc

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/*
 * Copyright (c) 2015 Advanced Micro Devices, Inc.
 * All rights reserved.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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#include "gpu-compute/gpu_static_inst.hh"
 
#include "debug/GPUInst.hh"
 
namespace gem5
{
 
GPUStaticInst::GPUStaticInst(const std::string &opcode)
    : executed_as(enums::SC_NONE), _opcode(opcode),
      _instNum(0), _instAddr(0), srcVecDWords(-1), dstVecDWords(-1),
      srcScalarDWords(-1), dstScalarDWords(-1), maxOpSize(-1)
{
}
 
const std::string&
GPUStaticInst::disassemble()
{
    if (disassembly.empty()) {
        generateDisassembly();
        assert(!disassembly.empty());
    }
 
    return disassembly;
}
 
void
GPUStaticInst::initDynOperandInfo(Wavefront *wf, ComputeUnit *cu)
{
    // Lambda function, as this is only ever used here
    auto generateVirtToPhysMap = [&](OperandInfo& op,
                                     std::vector<OperandInfo>& opVec,
                                     MapRegFn mapFn, OpType opType)
    {
        std::vector<int> virt_idxs;
        std::vector<int> phys_idxs;
 
        int num_dwords = op.sizeInDWords();
        int virt_idx = op.registerIndex(wf->reservedScalarRegs);
 
        int phys_idx = -1;
        for (int i = 0; i < num_dwords; i++){
            phys_idx = (cu->registerManager->*mapFn)(wf, virt_idx + i);
            virt_idxs.push_back(virt_idx + i);
            phys_idxs.push_back(phys_idx);
        }
        DPRINTF(GPUInst, "%s adding %s %s (%d->%d) operand that uses "
                "%d registers.\n", disassemble(),
                (opType == OpType::SRC_VEC || opType == OpType::DST_VEC) ?
                "vector" : "scalar",
                (opType == OpType::SRC_VEC || opType == OpType::SRC_SCALAR) ?
                "src" : "dst", virt_idxs[0], phys_idxs[0], num_dwords);
 
        op.setVirtToPhysMapping(virt_idxs, phys_idxs);
 
        opVec.emplace_back(op);
    };
 
    for (auto& srcOp : srcOps) {
        if (srcOp.isVectorReg()) {
            generateVirtToPhysMap(srcOp, srcVecRegOps,
                            &RegisterManager::mapVgpr, OpType::SRC_VEC);
        } else if (srcOp.isScalarReg()) {
            generateVirtToPhysMap(srcOp, srcScalarRegOps,
                            &RegisterManager::mapSgpr, OpType::SRC_SCALAR);
        }
    }
 
    for (auto& dstOp : dstOps) {
        if (dstOp.isVectorReg()) {
            generateVirtToPhysMap(dstOp, dstVecRegOps,
                            &RegisterManager::mapVgpr, OpType::DST_VEC);
        } else if (dstOp.isScalarReg()) {
            generateVirtToPhysMap(dstOp, dstScalarRegOps,
                            &RegisterManager::mapSgpr, OpType::DST_SCALAR);
        }
    }
}
 
int
GPUStaticInst::numSrcVecOperands()
{
    return srcVecRegOps.size();
}
 
int
GPUStaticInst::numDstVecOperands()
{
    return dstVecRegOps.size();
}
 
int
GPUStaticInst::numSrcVecDWords()
{
    if (srcVecDWords != -1) {
        return srcVecDWords;
    }
 
    srcVecDWords = 0;
 
    for (const auto& srcOp : srcOps)
        if (srcOp.isVectorReg())
            srcVecDWords += srcOp.sizeInDWords();
 
    return srcVecDWords;
}
 
int
GPUStaticInst::numDstVecDWords()
{
    if (dstVecDWords != -1) {
        return dstVecDWords;
    }
 
    dstVecDWords = 0;
 
    for (const auto& dstOp : dstOps)
        if (dstOp.isVectorReg())
            dstVecDWords += dstOp.sizeInDWords();
 
    return dstVecDWords;
}
 
int
GPUStaticInst::numSrcScalarOperands()
{
    return srcScalarRegOps.size();
}
 
int
GPUStaticInst::numDstScalarOperands()
{
    return dstScalarRegOps.size();
}
 
int
GPUStaticInst::numSrcScalarDWords()
{
    if (srcScalarDWords != -1)
        return srcScalarDWords;
 
    srcScalarDWords = 0;
 
    for (const auto& srcOp : srcOps)
        if (srcOp.isScalarReg())
            srcScalarDWords += srcOp.sizeInDWords();
 
    return srcScalarDWords;
}
 
int
GPUStaticInst::numDstScalarDWords()
{
    if (dstScalarDWords != -1)
        return dstScalarDWords;
 
    dstScalarDWords = 0;
 
    for (const auto& dstOp : dstOps)
        if (dstOp.isScalarReg())
            dstScalarDWords += dstOp.sizeInDWords();
 
    return dstScalarDWords;
}
 
int
GPUStaticInst::maxOperandSize()
{
    if (maxOpSize != -1)
        return maxOpSize;
 
    maxOpSize = 0;
 
    for (const auto& dstOp : dstOps)
        if (dstOp.size() > maxOpSize)
            maxOpSize = dstOp.size();
 
    for (const auto& srcOp : srcOps)
        if (srcOp.size() > maxOpSize)
            maxOpSize = srcOp.size();
 
    return maxOpSize;
}
 
} // namespace gem5