71 lines
2.7 KiB
C++
71 lines
2.7 KiB
C++
//===--------------------- InstructionTables.cpp ----------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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/// \file
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///
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/// This file implements the method InstructionTables::execute().
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/// Method execute() prints a theoretical resource pressure distribution based
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/// on the information available in the scheduling model, and without running
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/// the pipeline.
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///
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//===----------------------------------------------------------------------===//
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#include "InstructionTables.h"
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namespace mca {
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using namespace llvm;
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bool InstructionTables::execute(InstRef &IR) {
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ArrayRef<uint64_t> Masks = IB.getProcResourceMasks();
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const InstrDesc &Desc = IR.getInstruction()->getDesc();
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UsedResources.clear();
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// Identify the resources consumed by this instruction.
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for (const std::pair<uint64_t, ResourceUsage> Resource : Desc.Resources) {
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// Skip zero-cycle resources (i.e., unused resources).
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if (!Resource.second.size())
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continue;
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double Cycles = static_cast<double>(Resource.second.size());
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unsigned Index = std::distance(
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Masks.begin(), std::find(Masks.begin(), Masks.end(), Resource.first));
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const MCProcResourceDesc &ProcResource = *SM.getProcResource(Index);
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unsigned NumUnits = ProcResource.NumUnits;
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if (!ProcResource.SubUnitsIdxBegin) {
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// The number of cycles consumed by each unit.
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Cycles /= NumUnits;
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for (unsigned I = 0, E = NumUnits; I < E; ++I) {
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ResourceRef ResourceUnit = std::make_pair(Index, 1U << I);
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UsedResources.emplace_back(std::make_pair(ResourceUnit, Cycles));
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}
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continue;
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}
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// This is a group. Obtain the set of resources contained in this
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// group. Some of these resources may implement multiple units.
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// Uniformly distribute Cycles across all of the units.
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for (unsigned I1 = 0; I1 < NumUnits; ++I1) {
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unsigned SubUnitIdx = ProcResource.SubUnitsIdxBegin[I1];
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const MCProcResourceDesc &SubUnit = *SM.getProcResource(SubUnitIdx);
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// Compute the number of cycles consumed by each resource unit.
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double RUCycles = Cycles / (NumUnits * SubUnit.NumUnits);
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for (unsigned I2 = 0, E2 = SubUnit.NumUnits; I2 < E2; ++I2) {
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ResourceRef ResourceUnit = std::make_pair(SubUnitIdx, 1U << I2);
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UsedResources.emplace_back(std::make_pair(ResourceUnit, RUCycles));
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}
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}
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}
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// Send a fake instruction issued event to all the views.
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HWInstructionIssuedEvent Event(IR, UsedResources);
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notifyEvent<HWInstructionIssuedEvent>(Event);
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return true;
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}
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} // namespace mca
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