xref: /freebsd/contrib/llvm-project/llvm/tools/llvm-mca/llvm-mca.cpp (revision e6bfd18d21b225af6a0ed67ceeaf1293b7b9eba5) 
1 //===-- llvm-mca.cpp - Machine Code Analyzer -------------------*- C++ -* -===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This utility is a simple driver that allows static performance analysis on
10 // machine code similarly to how IACA (Intel Architecture Code Analyzer) works.
11 //
12 //   llvm-mca [options] <file-name>
13 //      -march <type>
14 //      -mcpu <cpu>
15 //      -o <file>
16 //
17 // The target defaults to the host target.
18 // The cpu defaults to the 'native' host cpu.
19 // The output defaults to standard output.
20 //
21 //===----------------------------------------------------------------------===//
22 
23 #include "CodeRegion.h"
24 #include "CodeRegionGenerator.h"
25 #include "PipelinePrinter.h"
26 #include "Views/BottleneckAnalysis.h"
27 #include "Views/DispatchStatistics.h"
28 #include "Views/InstructionInfoView.h"
29 #include "Views/RegisterFileStatistics.h"
30 #include "Views/ResourcePressureView.h"
31 #include "Views/RetireControlUnitStatistics.h"
32 #include "Views/SchedulerStatistics.h"
33 #include "Views/SummaryView.h"
34 #include "Views/TimelineView.h"
35 #include "llvm/MC/MCAsmBackend.h"
36 #include "llvm/MC/MCAsmInfo.h"
37 #include "llvm/MC/MCCodeEmitter.h"
38 #include "llvm/MC/MCContext.h"
39 #include "llvm/MC/MCObjectFileInfo.h"
40 #include "llvm/MC/MCRegisterInfo.h"
41 #include "llvm/MC/MCSubtargetInfo.h"
42 #include "llvm/MC/MCTargetOptionsCommandFlags.h"
43 #include "llvm/MC/TargetRegistry.h"
44 #include "llvm/MCA/CodeEmitter.h"
45 #include "llvm/MCA/Context.h"
46 #include "llvm/MCA/CustomBehaviour.h"
47 #include "llvm/MCA/InstrBuilder.h"
48 #include "llvm/MCA/Pipeline.h"
49 #include "llvm/MCA/Stages/EntryStage.h"
50 #include "llvm/MCA/Stages/InstructionTables.h"
51 #include "llvm/MCA/Support.h"
52 #include "llvm/Support/CommandLine.h"
53 #include "llvm/Support/ErrorHandling.h"
54 #include "llvm/Support/ErrorOr.h"
55 #include "llvm/Support/FileSystem.h"
56 #include "llvm/Support/Host.h"
57 #include "llvm/Support/InitLLVM.h"
58 #include "llvm/Support/MemoryBuffer.h"
59 #include "llvm/Support/SourceMgr.h"
60 #include "llvm/Support/TargetSelect.h"
61 #include "llvm/Support/ToolOutputFile.h"
62 #include "llvm/Support/WithColor.h"
63 
64 using namespace llvm;
65 
66 static mc::RegisterMCTargetOptionsFlags MOF;
67 
68 static cl::OptionCategory ToolOptions("Tool Options");
69 static cl::OptionCategory ViewOptions("View Options");
70 
71 static cl::opt<std::string> InputFilename(cl::Positional,
72                                           cl::desc("<input file>"),
73                                           cl::cat(ToolOptions), cl::init("-"));
74 
75 static cl::opt<std::string> OutputFilename("o", cl::desc("Output filename"),
76                                            cl::init("-"), cl::cat(ToolOptions),
77                                            cl::value_desc("filename"));
78 
79 static cl::opt<std::string>
80     ArchName("march",
81              cl::desc("Target architecture. "
82                       "See -version for available targets"),
83              cl::cat(ToolOptions));
84 
85 static cl::opt<std::string>
86     TripleName("mtriple",
87                cl::desc("Target triple. See -version for available targets"),
88                cl::cat(ToolOptions));
89 
90 static cl::opt<std::string>
91     MCPU("mcpu",
92          cl::desc("Target a specific cpu type (-mcpu=help for details)"),
93          cl::value_desc("cpu-name"), cl::cat(ToolOptions), cl::init("native"));
94 
95 static cl::list<std::string>
96     MATTRS("mattr", cl::CommaSeparated,
97            cl::desc("Target specific attributes (-mattr=help for details)"),
98            cl::value_desc("a1,+a2,-a3,..."), cl::cat(ToolOptions));
99 
100 static cl::opt<bool> PrintJson("json",
101                                cl::desc("Print the output in json format"),
102                                cl::cat(ToolOptions), cl::init(false));
103 
104 static cl::opt<int>
105     OutputAsmVariant("output-asm-variant",
106                      cl::desc("Syntax variant to use for output printing"),
107                      cl::cat(ToolOptions), cl::init(-1));
108 
109 static cl::opt<bool>
110     PrintImmHex("print-imm-hex", cl::cat(ToolOptions), cl::init(false),
111                 cl::desc("Prefer hex format when printing immediate values"));
112 
113 static cl::opt<unsigned> Iterations("iterations",
114                                     cl::desc("Number of iterations to run"),
115                                     cl::cat(ToolOptions), cl::init(0));
116 
117 static cl::opt<unsigned>
118     DispatchWidth("dispatch", cl::desc("Override the processor dispatch width"),
119                   cl::cat(ToolOptions), cl::init(0));
120 
121 static cl::opt<unsigned>
122     RegisterFileSize("register-file-size",
123                      cl::desc("Maximum number of physical registers which can "
124                               "be used for register mappings"),
125                      cl::cat(ToolOptions), cl::init(0));
126 
127 static cl::opt<unsigned>
128     MicroOpQueue("micro-op-queue-size", cl::Hidden,
129                  cl::desc("Number of entries in the micro-op queue"),
130                  cl::cat(ToolOptions), cl::init(0));
131 
132 static cl::opt<unsigned>
133     DecoderThroughput("decoder-throughput", cl::Hidden,
134                       cl::desc("Maximum throughput from the decoders "
135                                "(instructions per cycle)"),
136                       cl::cat(ToolOptions), cl::init(0));
137 
138 static cl::opt<bool>
139     PrintRegisterFileStats("register-file-stats",
140                            cl::desc("Print register file statistics"),
141                            cl::cat(ViewOptions), cl::init(false));
142 
143 static cl::opt<bool> PrintDispatchStats("dispatch-stats",
144                                         cl::desc("Print dispatch statistics"),
145                                         cl::cat(ViewOptions), cl::init(false));
146 
147 static cl::opt<bool>
148     PrintSummaryView("summary-view", cl::Hidden,
149                      cl::desc("Print summary view (enabled by default)"),
150                      cl::cat(ViewOptions), cl::init(true));
151 
152 static cl::opt<bool> PrintSchedulerStats("scheduler-stats",
153                                          cl::desc("Print scheduler statistics"),
154                                          cl::cat(ViewOptions), cl::init(false));
155 
156 static cl::opt<bool>
157     PrintRetireStats("retire-stats",
158                      cl::desc("Print retire control unit statistics"),
159                      cl::cat(ViewOptions), cl::init(false));
160 
161 static cl::opt<bool> PrintResourcePressureView(
162     "resource-pressure",
163     cl::desc("Print the resource pressure view (enabled by default)"),
164     cl::cat(ViewOptions), cl::init(true));
165 
166 static cl::opt<bool> PrintTimelineView("timeline",
167                                        cl::desc("Print the timeline view"),
168                                        cl::cat(ViewOptions), cl::init(false));
169 
170 static cl::opt<unsigned> TimelineMaxIterations(
171     "timeline-max-iterations",
172     cl::desc("Maximum number of iterations to print in timeline view"),
173     cl::cat(ViewOptions), cl::init(0));
174 
175 static cl::opt<unsigned>
176     TimelineMaxCycles("timeline-max-cycles",
177                       cl::desc("Maximum number of cycles in the timeline view, "
178                                "or 0 for unlimited. Defaults to 80 cycles"),
179                       cl::cat(ViewOptions), cl::init(80));
180 
181 static cl::opt<bool>
182     AssumeNoAlias("noalias",
183                   cl::desc("If set, assume that loads and stores do not alias"),
184                   cl::cat(ToolOptions), cl::init(true));
185 
186 static cl::opt<unsigned> LoadQueueSize("lqueue",
187                                        cl::desc("Size of the load queue"),
188                                        cl::cat(ToolOptions), cl::init(0));
189 
190 static cl::opt<unsigned> StoreQueueSize("squeue",
191                                         cl::desc("Size of the store queue"),
192                                         cl::cat(ToolOptions), cl::init(0));
193 
194 static cl::opt<bool>
195     PrintInstructionTables("instruction-tables",
196                            cl::desc("Print instruction tables"),
197                            cl::cat(ToolOptions), cl::init(false));
198 
199 static cl::opt<bool> PrintInstructionInfoView(
200     "instruction-info",
201     cl::desc("Print the instruction info view (enabled by default)"),
202     cl::cat(ViewOptions), cl::init(true));
203 
204 static cl::opt<bool> EnableAllStats("all-stats",
205                                     cl::desc("Print all hardware statistics"),
206                                     cl::cat(ViewOptions), cl::init(false));
207 
208 static cl::opt<bool>
209     EnableAllViews("all-views",
210                    cl::desc("Print all views including hardware statistics"),
211                    cl::cat(ViewOptions), cl::init(false));
212 
213 static cl::opt<bool> EnableBottleneckAnalysis(
214     "bottleneck-analysis",
215     cl::desc("Enable bottleneck analysis (disabled by default)"),
216     cl::cat(ViewOptions), cl::init(false));
217 
218 static cl::opt<bool> ShowEncoding(
219     "show-encoding",
220     cl::desc("Print encoding information in the instruction info view"),
221     cl::cat(ViewOptions), cl::init(false));
222 
223 static cl::opt<bool> ShowBarriers(
224     "show-barriers",
225     cl::desc("Print memory barrier information in the instruction info view"),
226     cl::cat(ViewOptions), cl::init(false));
227 
228 static cl::opt<bool> DisableCustomBehaviour(
229     "disable-cb",
230     cl::desc(
231         "Disable custom behaviour (use the default class which does nothing)."),
232     cl::cat(ViewOptions), cl::init(false));
233 
234 namespace {
235 
236 const Target *getTarget(const char *ProgName) {
237   if (TripleName.empty())
238     TripleName = Triple::normalize(sys::getDefaultTargetTriple());
239   Triple TheTriple(TripleName);
240 
241   // Get the target specific parser.
242   std::string Error;
243   const Target *TheTarget =
244       TargetRegistry::lookupTarget(ArchName, TheTriple, Error);
245   if (!TheTarget) {
246     errs() << ProgName << ": " << Error;
247     return nullptr;
248   }
249 
250   // Update TripleName with the updated triple from the target lookup.
251   TripleName = TheTriple.str();
252 
253   // Return the found target.
254   return TheTarget;
255 }
256 
257 ErrorOr<std::unique_ptr<ToolOutputFile>> getOutputStream() {
258   if (OutputFilename == "")
259     OutputFilename = "-";
260   std::error_code EC;
261   auto Out = std::make_unique<ToolOutputFile>(OutputFilename, EC,
262                                               sys::fs::OF_TextWithCRLF);
263   if (!EC)
264     return std::move(Out);
265   return EC;
266 }
267 } // end of anonymous namespace
268 
269 static void processOptionImpl(cl::opt<bool> &O, const cl::opt<bool> &Default) {
270   if (!O.getNumOccurrences() || O.getPosition() < Default.getPosition())
271     O = Default.getValue();
272 }
273 
274 static void processViewOptions(bool IsOutOfOrder) {
275   if (!EnableAllViews.getNumOccurrences() &&
276       !EnableAllStats.getNumOccurrences())
277     return;
278 
279   if (EnableAllViews.getNumOccurrences()) {
280     processOptionImpl(PrintSummaryView, EnableAllViews);
281     if (IsOutOfOrder)
282       processOptionImpl(EnableBottleneckAnalysis, EnableAllViews);
283     processOptionImpl(PrintResourcePressureView, EnableAllViews);
284     processOptionImpl(PrintTimelineView, EnableAllViews);
285     processOptionImpl(PrintInstructionInfoView, EnableAllViews);
286   }
287 
288   const cl::opt<bool> &Default =
289       EnableAllViews.getPosition() < EnableAllStats.getPosition()
290           ? EnableAllStats
291           : EnableAllViews;
292   processOptionImpl(PrintRegisterFileStats, Default);
293   processOptionImpl(PrintDispatchStats, Default);
294   processOptionImpl(PrintSchedulerStats, Default);
295   if (IsOutOfOrder)
296     processOptionImpl(PrintRetireStats, Default);
297 }
298 
299 // Returns true on success.
300 static bool runPipeline(mca::Pipeline &P) {
301   // Handle pipeline errors here.
302   Expected<unsigned> Cycles = P.run();
303   if (!Cycles) {
304     WithColor::error() << toString(Cycles.takeError());
305     return false;
306   }
307   return true;
308 }
309 
310 int main(int argc, char **argv) {
311   InitLLVM X(argc, argv);
312 
313   // Initialize targets and assembly parsers.
314   InitializeAllTargetInfos();
315   InitializeAllTargetMCs();
316   InitializeAllAsmParsers();
317   InitializeAllTargetMCAs();
318 
319   // Enable printing of available targets when flag --version is specified.
320   cl::AddExtraVersionPrinter(TargetRegistry::printRegisteredTargetsForVersion);
321 
322   cl::HideUnrelatedOptions({&ToolOptions, &ViewOptions});
323 
324   // Parse flags and initialize target options.
325   cl::ParseCommandLineOptions(argc, argv,
326                               "llvm machine code performance analyzer.\n");
327 
328   // Get the target from the triple. If a triple is not specified, then select
329   // the default triple for the host. If the triple doesn't correspond to any
330   // registered target, then exit with an error message.
331   const char *ProgName = argv[0];
332   const Target *TheTarget = getTarget(ProgName);
333   if (!TheTarget)
334     return 1;
335 
336   // GetTarget() may replaced TripleName with a default triple.
337   // For safety, reconstruct the Triple object.
338   Triple TheTriple(TripleName);
339 
340   ErrorOr<std::unique_ptr<MemoryBuffer>> BufferPtr =
341       MemoryBuffer::getFileOrSTDIN(InputFilename);
342   if (std::error_code EC = BufferPtr.getError()) {
343     WithColor::error() << InputFilename << ": " << EC.message() << '\n';
344     return 1;
345   }
346 
347   if (MCPU == "native")
348     MCPU = std::string(llvm::sys::getHostCPUName());
349 
350   // Package up features to be passed to target/subtarget
351   std::string FeaturesStr;
352   if (MATTRS.size()) {
353     SubtargetFeatures Features;
354     for (std::string &MAttr : MATTRS)
355       Features.AddFeature(MAttr);
356     FeaturesStr = Features.getString();
357   }
358 
359   std::unique_ptr<MCSubtargetInfo> STI(
360       TheTarget->createMCSubtargetInfo(TripleName, MCPU, FeaturesStr));
361   assert(STI && "Unable to create subtarget info!");
362   if (!STI->isCPUStringValid(MCPU))
363     return 1;
364 
365   if (!STI->getSchedModel().hasInstrSchedModel()) {
366     WithColor::error()
367         << "unable to find instruction-level scheduling information for"
368         << " target triple '" << TheTriple.normalize() << "' and cpu '" << MCPU
369         << "'.\n";
370 
371     if (STI->getSchedModel().InstrItineraries)
372       WithColor::note()
373           << "cpu '" << MCPU << "' provides itineraries. However, "
374           << "instruction itineraries are currently unsupported.\n";
375     return 1;
376   }
377 
378   // Apply overrides to llvm-mca specific options.
379   bool IsOutOfOrder = STI->getSchedModel().isOutOfOrder();
380   processViewOptions(IsOutOfOrder);
381 
382   std::unique_ptr<MCRegisterInfo> MRI(TheTarget->createMCRegInfo(TripleName));
383   assert(MRI && "Unable to create target register info!");
384 
385   MCTargetOptions MCOptions = mc::InitMCTargetOptionsFromFlags();
386   std::unique_ptr<MCAsmInfo> MAI(
387       TheTarget->createMCAsmInfo(*MRI, TripleName, MCOptions));
388   assert(MAI && "Unable to create target asm info!");
389 
390   SourceMgr SrcMgr;
391 
392   // Tell SrcMgr about this buffer, which is what the parser will pick up.
393   SrcMgr.AddNewSourceBuffer(std::move(*BufferPtr), SMLoc());
394 
395   MCContext Ctx(TheTriple, MAI.get(), MRI.get(), STI.get(), &SrcMgr);
396   std::unique_ptr<MCObjectFileInfo> MOFI(
397       TheTarget->createMCObjectFileInfo(Ctx, /*PIC=*/false));
398   Ctx.setObjectFileInfo(MOFI.get());
399 
400   std::unique_ptr<buffer_ostream> BOS;
401 
402   std::unique_ptr<MCInstrInfo> MCII(TheTarget->createMCInstrInfo());
403   assert(MCII && "Unable to create instruction info!");
404 
405   std::unique_ptr<MCInstrAnalysis> MCIA(
406       TheTarget->createMCInstrAnalysis(MCII.get()));
407 
408   // Need to initialize an MCInstPrinter as it is
409   // required for initializing the MCTargetStreamer
410   // which needs to happen within the CRG.parseCodeRegions() call below.
411   // Without an MCTargetStreamer, certain assembly directives can trigger a
412   // segfault. (For example, the .cv_fpo_proc directive on x86 will segfault if
413   // we don't initialize the MCTargetStreamer.)
414   unsigned IPtempOutputAsmVariant =
415       OutputAsmVariant == -1 ? 0 : OutputAsmVariant;
416   std::unique_ptr<MCInstPrinter> IPtemp(TheTarget->createMCInstPrinter(
417       Triple(TripleName), IPtempOutputAsmVariant, *MAI, *MCII, *MRI));
418   if (!IPtemp) {
419     WithColor::error()
420         << "unable to create instruction printer for target triple '"
421         << TheTriple.normalize() << "' with assembly variant "
422         << IPtempOutputAsmVariant << ".\n";
423     return 1;
424   }
425 
426   // Parse the input and create CodeRegions that llvm-mca can analyze.
427   mca::AsmCodeRegionGenerator CRG(*TheTarget, SrcMgr, Ctx, *MAI, *STI, *MCII);
428   Expected<const mca::CodeRegions &> RegionsOrErr =
429       CRG.parseCodeRegions(std::move(IPtemp));
430   if (!RegionsOrErr) {
431     if (auto Err =
432             handleErrors(RegionsOrErr.takeError(), [](const StringError &E) {
433               WithColor::error() << E.getMessage() << '\n';
434             })) {
435       // Default case.
436       WithColor::error() << toString(std::move(Err)) << '\n';
437     }
438     return 1;
439   }
440   const mca::CodeRegions &Regions = *RegionsOrErr;
441 
442   // Early exit if errors were found by the code region parsing logic.
443   if (!Regions.isValid())
444     return 1;
445 
446   if (Regions.empty()) {
447     WithColor::error() << "no assembly instructions found.\n";
448     return 1;
449   }
450 
451   // Now initialize the output file.
452   auto OF = getOutputStream();
453   if (std::error_code EC = OF.getError()) {
454     WithColor::error() << EC.message() << '\n';
455     return 1;
456   }
457 
458   unsigned AssemblerDialect = CRG.getAssemblerDialect();
459   if (OutputAsmVariant >= 0)
460     AssemblerDialect = static_cast<unsigned>(OutputAsmVariant);
461   std::unique_ptr<MCInstPrinter> IP(TheTarget->createMCInstPrinter(
462       Triple(TripleName), AssemblerDialect, *MAI, *MCII, *MRI));
463   if (!IP) {
464     WithColor::error()
465         << "unable to create instruction printer for target triple '"
466         << TheTriple.normalize() << "' with assembly variant "
467         << AssemblerDialect << ".\n";
468     return 1;
469   }
470 
471   // Set the display preference for hex vs. decimal immediates.
472   IP->setPrintImmHex(PrintImmHex);
473 
474   std::unique_ptr<ToolOutputFile> TOF = std::move(*OF);
475 
476   const MCSchedModel &SM = STI->getSchedModel();
477 
478   std::unique_ptr<mca::InstrPostProcess> IPP;
479   if (!DisableCustomBehaviour) {
480     // TODO: It may be a good idea to separate CB and IPP so that they can
481     // be used independently of each other. What I mean by this is to add
482     // an extra command-line arg --disable-ipp so that CB and IPP can be
483     // toggled without needing to toggle both of them together.
484     IPP = std::unique_ptr<mca::InstrPostProcess>(
485         TheTarget->createInstrPostProcess(*STI, *MCII));
486   }
487   if (!IPP) {
488     // If the target doesn't have its own IPP implemented (or the -disable-cb
489     // flag is set) then we use the base class (which does nothing).
490     IPP = std::make_unique<mca::InstrPostProcess>(*STI, *MCII);
491   }
492 
493   // Create an instruction builder.
494   mca::InstrBuilder IB(*STI, *MCII, *MRI, MCIA.get());
495 
496   // Create a context to control ownership of the pipeline hardware.
497   mca::Context MCA(*MRI, *STI);
498 
499   mca::PipelineOptions PO(MicroOpQueue, DecoderThroughput, DispatchWidth,
500                           RegisterFileSize, LoadQueueSize, StoreQueueSize,
501                           AssumeNoAlias, EnableBottleneckAnalysis);
502 
503   // Number each region in the sequence.
504   unsigned RegionIdx = 0;
505 
506   std::unique_ptr<MCCodeEmitter> MCE(
507       TheTarget->createMCCodeEmitter(*MCII, Ctx));
508   assert(MCE && "Unable to create code emitter!");
509 
510   std::unique_ptr<MCAsmBackend> MAB(TheTarget->createMCAsmBackend(
511       *STI, *MRI, mc::InitMCTargetOptionsFromFlags()));
512   assert(MAB && "Unable to create asm backend!");
513 
514   json::Object JSONOutput;
515   for (const std::unique_ptr<mca::CodeRegion> &Region : Regions) {
516     // Skip empty code regions.
517     if (Region->empty())
518       continue;
519 
520     IB.clear();
521 
522     // Lower the MCInst sequence into an mca::Instruction sequence.
523     ArrayRef<MCInst> Insts = Region->getInstructions();
524     mca::CodeEmitter CE(*STI, *MAB, *MCE, Insts);
525 
526     IPP->resetState();
527 
528     SmallVector<std::unique_ptr<mca::Instruction>> LoweredSequence;
529     for (const MCInst &MCI : Insts) {
530       Expected<std::unique_ptr<mca::Instruction>> Inst =
531           IB.createInstruction(MCI);
532       if (!Inst) {
533         if (auto NewE = handleErrors(
534                 Inst.takeError(),
535                 [&IP, &STI](const mca::InstructionError<MCInst> &IE) {
536                   std::string InstructionStr;
537                   raw_string_ostream SS(InstructionStr);
538                   WithColor::error() << IE.Message << '\n';
539                   IP->printInst(&IE.Inst, 0, "", *STI, SS);
540                   SS.flush();
541                   WithColor::note()
542                       << "instruction: " << InstructionStr << '\n';
543                 })) {
544           // Default case.
545           WithColor::error() << toString(std::move(NewE));
546         }
547         return 1;
548       }
549 
550       IPP->postProcessInstruction(Inst.get(), MCI);
551 
552       LoweredSequence.emplace_back(std::move(Inst.get()));
553     }
554 
555     mca::CircularSourceMgr S(LoweredSequence,
556                              PrintInstructionTables ? 1 : Iterations);
557 
558     if (PrintInstructionTables) {
559       //  Create a pipeline, stages, and a printer.
560       auto P = std::make_unique<mca::Pipeline>();
561       P->appendStage(std::make_unique<mca::EntryStage>(S));
562       P->appendStage(std::make_unique<mca::InstructionTables>(SM));
563 
564       mca::PipelinePrinter Printer(*P, *Region, RegionIdx, *STI, PO);
565       if (PrintJson) {
566         Printer.addView(
567             std::make_unique<mca::InstructionView>(*STI, *IP, Insts));
568       }
569 
570       // Create the views for this pipeline, execute, and emit a report.
571       if (PrintInstructionInfoView) {
572         Printer.addView(std::make_unique<mca::InstructionInfoView>(
573             *STI, *MCII, CE, ShowEncoding, Insts, *IP, LoweredSequence,
574             ShowBarriers));
575       }
576       Printer.addView(
577           std::make_unique<mca::ResourcePressureView>(*STI, *IP, Insts));
578 
579       if (!runPipeline(*P))
580         return 1;
581 
582       if (PrintJson) {
583         Printer.printReport(JSONOutput);
584       } else {
585         Printer.printReport(TOF->os());
586       }
587 
588       ++RegionIdx;
589       continue;
590     }
591 
592     // Create the CustomBehaviour object for enforcing Target Specific
593     // behaviours and dependencies that aren't expressed well enough
594     // in the tablegen. CB cannot depend on the list of MCInst or
595     // the source code (but it can depend on the list of
596     // mca::Instruction or any objects that can be reconstructed
597     // from the target information).
598     std::unique_ptr<mca::CustomBehaviour> CB;
599     if (!DisableCustomBehaviour)
600       CB = std::unique_ptr<mca::CustomBehaviour>(
601           TheTarget->createCustomBehaviour(*STI, S, *MCII));
602     if (!CB)
603       // If the target doesn't have its own CB implemented (or the -disable-cb
604       // flag is set) then we use the base class (which does nothing).
605       CB = std::make_unique<mca::CustomBehaviour>(*STI, S, *MCII);
606 
607     // Create a basic pipeline simulating an out-of-order backend.
608     auto P = MCA.createDefaultPipeline(PO, S, *CB);
609 
610     mca::PipelinePrinter Printer(*P, *Region, RegionIdx, *STI, PO);
611 
612     // Targets can define their own custom Views that exist within their
613     // /lib/Target/ directory so that the View can utilize their CustomBehaviour
614     // or other backend symbols / functionality that are not already exposed
615     // through one of the MC-layer classes. These Views will be initialized
616     // using the CustomBehaviour::getViews() variants.
617     // If a target makes a custom View that does not depend on their target
618     // CB or their backend, they should put the View within
619     // /tools/llvm-mca/Views/ instead.
620     if (!DisableCustomBehaviour) {
621       std::vector<std::unique_ptr<mca::View>> CBViews =
622           CB->getStartViews(*IP, Insts);
623       for (auto &CBView : CBViews)
624         Printer.addView(std::move(CBView));
625     }
626 
627     // When we output JSON, we add a view that contains the instructions
628     // and CPU resource information.
629     if (PrintJson) {
630       auto IV = std::make_unique<mca::InstructionView>(*STI, *IP, Insts);
631       Printer.addView(std::move(IV));
632     }
633 
634     if (PrintSummaryView)
635       Printer.addView(
636           std::make_unique<mca::SummaryView>(SM, Insts, DispatchWidth));
637 
638     if (EnableBottleneckAnalysis) {
639       if (!IsOutOfOrder) {
640         WithColor::warning()
641             << "bottleneck analysis is not supported for in-order CPU '" << MCPU
642             << "'.\n";
643       }
644       Printer.addView(std::make_unique<mca::BottleneckAnalysis>(
645           *STI, *IP, Insts, S.getNumIterations()));
646     }
647 
648     if (PrintInstructionInfoView)
649       Printer.addView(std::make_unique<mca::InstructionInfoView>(
650           *STI, *MCII, CE, ShowEncoding, Insts, *IP, LoweredSequence,
651           ShowBarriers));
652 
653     // Fetch custom Views that are to be placed after the InstructionInfoView.
654     // Refer to the comment paired with the CB->getStartViews(*IP, Insts); line
655     // for more info.
656     if (!DisableCustomBehaviour) {
657       std::vector<std::unique_ptr<mca::View>> CBViews =
658           CB->getPostInstrInfoViews(*IP, Insts);
659       for (auto &CBView : CBViews)
660         Printer.addView(std::move(CBView));
661     }
662 
663     if (PrintDispatchStats)
664       Printer.addView(std::make_unique<mca::DispatchStatistics>());
665 
666     if (PrintSchedulerStats)
667       Printer.addView(std::make_unique<mca::SchedulerStatistics>(*STI));
668 
669     if (PrintRetireStats)
670       Printer.addView(std::make_unique<mca::RetireControlUnitStatistics>(SM));
671 
672     if (PrintRegisterFileStats)
673       Printer.addView(std::make_unique<mca::RegisterFileStatistics>(*STI));
674 
675     if (PrintResourcePressureView)
676       Printer.addView(
677           std::make_unique<mca::ResourcePressureView>(*STI, *IP, Insts));
678 
679     if (PrintTimelineView) {
680       unsigned TimelineIterations =
681           TimelineMaxIterations ? TimelineMaxIterations : 10;
682       Printer.addView(std::make_unique<mca::TimelineView>(
683           *STI, *IP, Insts, std::min(TimelineIterations, S.getNumIterations()),
684           TimelineMaxCycles));
685     }
686 
687     // Fetch custom Views that are to be placed after all other Views.
688     // Refer to the comment paired with the CB->getStartViews(*IP, Insts); line
689     // for more info.
690     if (!DisableCustomBehaviour) {
691       std::vector<std::unique_ptr<mca::View>> CBViews =
692           CB->getEndViews(*IP, Insts);
693       for (auto &CBView : CBViews)
694         Printer.addView(std::move(CBView));
695     }
696 
697     if (!runPipeline(*P))
698       return 1;
699 
700     if (PrintJson) {
701       Printer.printReport(JSONOutput);
702     } else {
703       Printer.printReport(TOF->os());
704     }
705 
706     ++RegionIdx;
707   }
708 
709   if (PrintJson)
710     TOF->os() << formatv("{0:2}", json::Value(std::move(JSONOutput))) << "\n";
711 
712   TOF->keep();
713   return 0;
714 }
715