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