| //===--------------------- InstructionTables.cpp ----------------*- C++ -*-===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| /// \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(), find(Masks, 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 |