1 //===--------------------- InstructionTables.cpp ----------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
11 /// This file implements the method InstructionTables::execute().
12 /// Method execute() prints a theoretical resource pressure distribution based
13 /// on the information available in the scheduling model, and without running
16 //===----------------------------------------------------------------------===//
18 #include "llvm/MCA/Stages/InstructionTables.h"
23 Error InstructionTables::execute(InstRef &IR) {
24 const InstrDesc &Desc = IR.getInstruction()->getDesc();
25 UsedResources.clear();
27 // Identify the resources consumed by this instruction.
28 for (const std::pair<uint64_t, ResourceUsage> Resource : Desc.Resources) {
29 // Skip zero-cycle resources (i.e., unused resources).
30 if (!Resource.second.size())
32 unsigned Cycles = Resource.second.size();
33 unsigned Index = std::distance(
34 Masks.begin(), std::find(Masks.begin(), Masks.end(), Resource.first));
35 const MCProcResourceDesc &ProcResource = *SM.getProcResource(Index);
36 unsigned NumUnits = ProcResource.NumUnits;
37 if (!ProcResource.SubUnitsIdxBegin) {
38 // The number of cycles consumed by each unit.
39 for (unsigned I = 0, E = NumUnits; I < E; ++I) {
40 ResourceRef ResourceUnit = std::make_pair(Index, 1U << I);
41 UsedResources.emplace_back(
42 std::make_pair(ResourceUnit, ResourceCycles(Cycles, NumUnits)));
47 // This is a group. Obtain the set of resources contained in this
48 // group. Some of these resources may implement multiple units.
49 // Uniformly distribute Cycles across all of the units.
50 for (unsigned I1 = 0; I1 < NumUnits; ++I1) {
51 unsigned SubUnitIdx = ProcResource.SubUnitsIdxBegin[I1];
52 const MCProcResourceDesc &SubUnit = *SM.getProcResource(SubUnitIdx);
53 // Compute the number of cycles consumed by each resource unit.
54 for (unsigned I2 = 0, E2 = SubUnit.NumUnits; I2 < E2; ++I2) {
55 ResourceRef ResourceUnit = std::make_pair(SubUnitIdx, 1U << I2);
56 UsedResources.emplace_back(std::make_pair(
57 ResourceUnit, ResourceCycles(Cycles, NumUnits * SubUnit.NumUnits)));
62 // Send a fake instruction issued event to all the views.
63 HWInstructionIssuedEvent Event(IR, UsedResources);
64 notifyEvent<HWInstructionIssuedEvent>(Event);
65 return ErrorSuccess();