[NFC] Split up PassBuilder.cpp

[aeubanks]

Summary

PassBuilder.cpp is the slowest file to compile in LLVM.
When trying to test changes to pipelines, it takes a long time to recompile.

This doesn't actually speedup building PassBuilder.cpp itself since most
of the time is spent in other large/duplicated functions caused by
PassRegistry.def.

[aeubanks]

typo

llvm/lib/Passes/CMakeLists.txt

 add_llvm_component_library(LLVMPasses
+  OptimizationLevel.cpp
   PassBuilder.cpp
   PassBuilderBindings.cpp
+  PassBuilderPipelines.cpp
   PassPlugin.cpp
   StandardInstrumentations.cpp
 
   ADDITIONAL_HEADER_DIRS
   ${LLVM_MAIN_INCLUDE_DIR}/llvm
   ${LLVM_MAIN_INCLUDE_DIR}/llvm/Passes
 
   DEPENDS

llvm/lib/Passes/OptimizationLevel.cpp

+//===- OptimizationLevels.cpp ---------------------------------------------===//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/Passes/OptimizationLevel.h"
+
+using namespace llvm;
+
+const OptimizationLevel OptimizationLevel::O0 = {
+    /*SpeedLevel*/ 0,
+    /*SizeLevel*/ 0};
+const OptimizationLevel OptimizationLevel::O1 = {
+    /*SpeedLevel*/ 1,
+    /*SizeLevel*/ 0};
+const OptimizationLevel OptimizationLevel::O2 = {
+    /*SpeedLevel*/ 2,
+    /*SizeLevel*/ 0};
+const OptimizationLevel OptimizationLevel::O3 = {
+    /*SpeedLevel*/ 3,
+    /*SizeLevel*/ 0};
+const OptimizationLevel OptimizationLevel::Os = {
+    /*SpeedLevel*/ 2,
+    /*SizeLevel*/ 1};
+const OptimizationLevel OptimizationLevel::Oz = {
+    /*SpeedLevel*/ 2,
+    /*SizeLevel*/ 2};

llvm/lib/Passes/PassBuilder.cpp

-//===- Parsing, selection, and construction of pass pipelines -------------===//
+//===- Parsing and selection of pass pipelines ----------------------------===//
 //
 // 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
 ///

 #include "llvm/Transforms/Utils/UnifyLoopExits.h"
 #include "llvm/Transforms/Vectorize/LoadStoreVectorizer.h"
 #include "llvm/Transforms/Vectorize/LoopVectorize.h"
 #include "llvm/Transforms/Vectorize/SLPVectorizer.h"
 #include "llvm/Transforms/Vectorize/VectorCombine.h"
 
 using namespace llvm;
 
-static cl::opt<InliningAdvisorMode> UseInlineAdvisor(
-    "enable-ml-inliner", cl::init(InliningAdvisorMode::Default), cl::Hidden,
-    cl::desc("Enable ML policy for inliner. Currently trained for -Oz only"),
-    cl::values(clEnumValN(InliningAdvisorMode::Default, "default",
-                          "Heuristics-based inliner version."),
-               clEnumValN(InliningAdvisorMode::Development, "development",
-                          "Use development mode (runtime-loadable model)."),
-               clEnumValN(InliningAdvisorMode::Release, "release",
-                          "Use release mode (AOT-compiled model).")));
-
-static cl::opt<bool> EnableSyntheticCounts(
-    "enable-npm-synthetic-counts", cl::init(false), cl::Hidden, cl::ZeroOrMore,
-    cl::desc("Run synthetic function entry count generation "
-             "pass"));
-
 static const Regex DefaultAliasRegex(
     "^(default|thinlto-pre-link|thinlto|lto-pre-link|lto)<(O[0123sz])>$");
 
-/// Flag to enable inline deferral during PGO.
-static cl::opt<bool>
-    EnablePGOInlineDeferral("enable-npm-pgo-inline-deferral", cl::init(true),
-                            cl::Hidden,
-                            cl::desc("Enable inline deferral during PGO"));
-
-static cl::opt<bool> EnableMemProfiler("enable-mem-prof", cl::init(false),
-                                       cl::Hidden, cl::ZeroOrMore,
-                                       cl::desc("Enable memory profiler"));
-
-static cl::opt<bool> PerformMandatoryInliningsFirst(
-    "mandatory-inlining-first", cl::init(true), cl::Hidden, cl::ZeroOrMore,
-    cl::desc("Perform mandatory inlinings module-wide, before performing "
-             "inlining."));
-
-static cl::opt<bool> EnableO3NonTrivialUnswitching(
-    "enable-npm-O3-nontrivial-unswitch", cl::init(true), cl::Hidden,
-    cl::ZeroOrMore, cl::desc("Enable non-trivial loop unswitching for -O3"));
-
-PipelineTuningOptions::PipelineTuningOptions() {
-  LoopInterleaving = true;
-  LoopVectorization = true;
-  SLPVectorization = false;
-  LoopUnrolling = true;
-  ForgetAllSCEVInLoopUnroll = ForgetSCEVInLoopUnroll;
-  LicmMssaOptCap = SetLicmMssaOptCap;
-  LicmMssaNoAccForPromotionCap = SetLicmMssaNoAccForPromotionCap;
-  CallGraphProfile = true;
-  MergeFunctions = false;
-}
-
 namespace llvm {
 cl::opt<bool> PrintPipelinePasses(
     "print-pipeline-passes",
     cl::desc("Print a '-passes' compatible string describing the pipeline "
              "(best-effort only)."));
-
-extern cl::opt<unsigned> MaxDevirtIterations;
-extern cl::opt<bool> EnableConstraintElimination;
-extern cl::opt<bool> EnableFunctionSpecialization;
-extern cl::opt<bool> EnableGVNHoist;
-extern cl::opt<bool> EnableGVNSink;
-extern cl::opt<bool> EnableHotColdSplit;
-extern cl::opt<bool> EnableIROutliner;
-extern cl::opt<bool> EnableOrderFileInstrumentation;
-extern cl::opt<bool> EnableCHR;
-extern cl::opt<bool> EnableLoopInterchange;
-extern cl::opt<bool> EnableUnrollAndJam;
-extern cl::opt<bool> EnableLoopFlatten;
-extern cl::opt<bool> EnableDFAJumpThreading;
-extern cl::opt<bool> RunNewGVN;
-extern cl::opt<bool> RunPartialInlining;
-extern cl::opt<bool> ExtraVectorizerPasses;
-
-extern cl::opt<bool> FlattenedProfileUsed;
-
-extern cl::opt<AttributorRunOption> AttributorRun;
-extern cl::opt<bool> EnableKnowledgeRetention;
-
-extern cl::opt<bool> EnableMatrix;
-
-extern cl::opt<bool> DisablePreInliner;
-extern cl::opt<int> PreInlineThreshold;
 } // namespace llvm
 
-const OptimizationLevel OptimizationLevel::O0 = {
-    /*SpeedLevel*/ 0,
-    /*SizeLevel*/ 0};
-const OptimizationLevel OptimizationLevel::O1 = {
-    /*SpeedLevel*/ 1,
-    /*SizeLevel*/ 0};
-const OptimizationLevel OptimizationLevel::O2 = {
-    /*SpeedLevel*/ 2,
-    /*SizeLevel*/ 0};
-const OptimizationLevel OptimizationLevel::O3 = {
-    /*SpeedLevel*/ 3,
-    /*SizeLevel*/ 0};
-const OptimizationLevel OptimizationLevel::Os = {
-    /*SpeedLevel*/ 2,
-    /*SizeLevel*/ 1};
-const OptimizationLevel OptimizationLevel::Oz = {
-    /*SpeedLevel*/ 2,
-    /*SizeLevel*/ 2};
-
 namespace {
 
 // The following passes/analyses have custom names, otherwise their name will
 // include `(anonymous namespace)`. These are special since they are only for
 // testing purposes and don't live in a header file.
 
 /// No-op module pass which does nothing.
 struct NoOpModulePass : PassInfoMixin<NoOpModulePass> {

 #define CGSCC_PASS(NAME, CREATE_PASS)                                          \
   PIC->addClassToPassName(decltype(CREATE_PASS)::name(), NAME);
 #define CGSCC_ANALYSIS(NAME, CREATE_PASS)                                      \
   PIC->addClassToPassName(decltype(CREATE_PASS)::name(), NAME);
 #include "PassRegistry.def"
   }
 }
 
-void PassBuilder::invokePeepholeEPCallbacks(FunctionPassManager &FPM,
-                                            OptimizationLevel Level) {
-  for (auto &C : PeepholeEPCallbacks)
-    C(FPM, Level);
-}
-
 void PassBuilder::registerModuleAnalyses(ModuleAnalysisManager &MAM) {
 #define MODULE_ANALYSIS(NAME, CREATE_PASS)                                     \
   MAM.registerPass([&] { return CREATE_PASS; });
 #include "PassRegistry.def"
 
   for (auto &C : ModuleAnalysisRegistrationCallbacks)
     C(MAM);
 }

 #define LOOP_ANALYSIS(NAME, CREATE_PASS)                                       \
   LAM.registerPass([&] { return CREATE_PASS; });
 #include "PassRegistry.def"
 
   for (auto &C : LoopAnalysisRegistrationCallbacks)
     C(LAM);
 }
 
-// Helper to add AnnotationRemarksPass.
-static void addAnnotationRemarksPass(ModulePassManager &MPM) {
-  FunctionPassManager FPM;
-  FPM.addPass(AnnotationRemarksPass());
-  MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
-}
-
-// Helper to check if the current compilation phase is preparing for LTO
-static bool isLTOPreLink(ThinOrFullLTOPhase Phase) {
-  return Phase == ThinOrFullLTOPhase::ThinLTOPreLink ||
-         Phase == ThinOrFullLTOPhase::FullLTOPreLink;
-}
-
-// TODO: Investigate the cost/benefit of tail call elimination on debugging.
-FunctionPassManager
-PassBuilder::buildO1FunctionSimplificationPipeline(OptimizationLevel Level,
-                                                   ThinOrFullLTOPhase Phase) {
-
-  FunctionPassManager FPM;
-
-  // Form SSA out of local memory accesses after breaking apart aggregates into
-  // scalars.
-  FPM.addPass(SROA());
-
-  // Catch trivial redundancies
-  FPM.addPass(EarlyCSEPass(true /* Enable mem-ssa. */));
-
-  // Hoisting of scalars and load expressions.
-  FPM.addPass(SimplifyCFGPass());
-  FPM.addPass(InstCombinePass());
-
-  FPM.addPass(LibCallsShrinkWrapPass());
-
-  invokePeepholeEPCallbacks(FPM, Level);
-
-  FPM.addPass(SimplifyCFGPass());
-
-  // Form canonically associated expression trees, and simplify the trees using
-  // basic mathematical properties. For example, this will form (nearly)
-  // minimal multiplication trees.
-  FPM.addPass(ReassociatePass());
-
-  // Add the primary loop simplification pipeline.
-  // FIXME: Currently this is split into two loop pass pipelines because we run
-  // some function passes in between them. These can and should be removed
-  // and/or replaced by scheduling the loop pass equivalents in the correct
-  // positions. But those equivalent passes aren't powerful enough yet.
-  // Specifically, `SimplifyCFGPass` and `InstCombinePass` are currently still
-  // used. We have `LoopSimplifyCFGPass` which isn't yet powerful enough yet to
-  // fully replace `SimplifyCFGPass`, and the closest to the other we have is
-  // `LoopInstSimplify`.
-  LoopPassManager LPM1, LPM2;
-
-  // Simplify the loop body. We do this initially to clean up after other loop
-  // passes run, either when iterating on a loop or on inner loops with
-  // implications on the outer loop.
-  LPM1.addPass(LoopInstSimplifyPass());
-  LPM1.addPass(LoopSimplifyCFGPass());
-
-  // Try to remove as much code from the loop header as possible,
-  // to reduce amount of IR that will have to be duplicated.
-  // TODO: Investigate promotion cap for O1.
-  LPM1.addPass(LICMPass(PTO.LicmMssaOptCap, PTO.LicmMssaNoAccForPromotionCap));
-
-  LPM1.addPass(LoopRotatePass(/* Disable header duplication */ true,
-                              isLTOPreLink(Phase)));
-  // TODO: Investigate promotion cap for O1.
-  LPM1.addPass(LICMPass(PTO.LicmMssaOptCap, PTO.LicmMssaNoAccForPromotionCap));
-  LPM1.addPass(SimpleLoopUnswitchPass());
-
-  LPM2.addPass(LoopIdiomRecognizePass());
-  LPM2.addPass(IndVarSimplifyPass());
-
-  for (auto &C : LateLoopOptimizationsEPCallbacks)
-    C(LPM2, Level);
-
-  LPM2.addPass(LoopDeletionPass());
-
-  if (EnableLoopInterchange)
-    LPM2.addPass(LoopInterchangePass());
-
-  // Do not enable unrolling in PreLinkThinLTO phase during sample PGO
-  // because it changes IR to makes profile annotation in back compile
-  // inaccurate. The normal unroller doesn't pay attention to forced full unroll
-  // attributes so we need to make sure and allow the full unroll pass to pay
-  // attention to it.
-  if (Phase != ThinOrFullLTOPhase::ThinLTOPreLink || !PGOOpt ||
-      PGOOpt->Action != PGOOptions::SampleUse)
-    LPM2.addPass(LoopFullUnrollPass(Level.getSpeedupLevel(),
-                                    /* OnlyWhenForced= */ !PTO.LoopUnrolling,
-                                    PTO.ForgetAllSCEVInLoopUnroll));
-
-  for (auto &C : LoopOptimizerEndEPCallbacks)
-    C(LPM2, Level);
-
-  // We provide the opt remark emitter pass for LICM to use. We only need to do
-  // this once as it is immutable.
-  FPM.addPass(
-      RequireAnalysisPass<OptimizationRemarkEmitterAnalysis, Function>());
-  FPM.addPass(createFunctionToLoopPassAdaptor(std::move(LPM1),
-                                              /*UseMemorySSA=*/true,
-                                              /*UseBlockFrequencyInfo=*/true));
-  FPM.addPass(SimplifyCFGPass());
-  FPM.addPass(InstCombinePass());
-  if (EnableLoopFlatten)
-    FPM.addPass(createFunctionToLoopPassAdaptor(LoopFlattenPass()));
-  // The loop passes in LPM2 (LoopFullUnrollPass) do not preserve MemorySSA.
-  // *All* loop passes must preserve it, in order to be able to use it.
-  FPM.addPass(createFunctionToLoopPassAdaptor(std::move(LPM2),
-                                              /*UseMemorySSA=*/false,
-                                              /*UseBlockFrequencyInfo=*/false));
-
-  // Delete small array after loop unroll.
-  FPM.addPass(SROA());
-
-  // Specially optimize memory movement as it doesn't look like dataflow in SSA.
-  FPM.addPass(MemCpyOptPass());
-
-  // Sparse conditional constant propagation.
-  // FIXME: It isn't clear why we do this *after* loop passes rather than
-  // before...
-  FPM.addPass(SCCPPass());
-
-  // Delete dead bit computations (instcombine runs after to fold away the dead
-  // computations, and then ADCE will run later to exploit any new DCE
-  // opportunities that creates).
-  FPM.addPass(BDCEPass());
-
-  // Run instcombine after redundancy and dead bit elimination to exploit
-  // opportunities opened up by them.
-  FPM.addPass(InstCombinePass());
-  invokePeepholeEPCallbacks(FPM, Level);
-
-  FPM.addPass(CoroElidePass());
-
-  for (auto &C : ScalarOptimizerLateEPCallbacks)
-    C(FPM, Level);
-
-  // Finally, do an expensive DCE pass to catch all the dead code exposed by
-  // the simplifications and basic cleanup after all the simplifications.
-  // TODO: Investigate if this is too expensive.
-  FPM.addPass(ADCEPass());
-  FPM.addPass(SimplifyCFGPass());
-  FPM.addPass(InstCombinePass());
-  invokePeepholeEPCallbacks(FPM, Level);
-
-  return FPM;
-}
-
-FunctionPassManager
-PassBuilder::buildFunctionSimplificationPipeline(OptimizationLevel Level,
-                                                 ThinOrFullLTOPhase Phase) {
-  assert(Level != OptimizationLevel::O0 && "Must request optimizations!");
-
-  // The O1 pipeline has a separate pipeline creation function to simplify
-  // construction readability.
-  if (Level.getSpeedupLevel() == 1)
-    return buildO1FunctionSimplificationPipeline(Level, Phase);
-
-  FunctionPassManager FPM;
-
-  // Form SSA out of local memory accesses after breaking apart aggregates into
-  // scalars.
-  FPM.addPass(SROA());
-
-  // Catch trivial redundancies
-  FPM.addPass(EarlyCSEPass(true /* Enable mem-ssa. */));
-  if (EnableKnowledgeRetention)
-    FPM.addPass(AssumeSimplifyPass());
-
-  // Hoisting of scalars and load expressions.
-  if (EnableGVNHoist)
-    FPM.addPass(GVNHoistPass());
-
-  // Global value numbering based sinking.
-  if (EnableGVNSink) {
-    FPM.addPass(GVNSinkPass());
-    FPM.addPass(SimplifyCFGPass());
-  }
-
-  if (EnableConstraintElimination)
-    FPM.addPass(ConstraintEliminationPass());
-
-  // Speculative execution if the target has divergent branches; otherwise nop.
-  FPM.addPass(SpeculativeExecutionPass(/* OnlyIfDivergentTarget =*/true));
-
-  // Optimize based on known information about branches, and cleanup afterward.
-  FPM.addPass(JumpThreadingPass());
-  FPM.addPass(CorrelatedValuePropagationPass());
-
-  FPM.addPass(SimplifyCFGPass());
-  if (Level == OptimizationLevel::O3)
-    FPM.addPass(AggressiveInstCombinePass());
-  FPM.addPass(InstCombinePass());
-
-  if (!Level.isOptimizingForSize())
-    FPM.addPass(LibCallsShrinkWrapPass());
-
-  invokePeepholeEPCallbacks(FPM, Level);
-
-  // For PGO use pipeline, try to optimize memory intrinsics such as memcpy
-  // using the size value profile. Don't perform this when optimizing for size.
-  if (PGOOpt && PGOOpt->Action == PGOOptions::IRUse &&
-      !Level.isOptimizingForSize())
-    FPM.addPass(PGOMemOPSizeOpt());
-
-  FPM.addPass(TailCallElimPass());
-  FPM.addPass(SimplifyCFGPass());
-
-  // Form canonically associated expression trees, and simplify the trees using
-  // basic mathematical properties. For example, this will form (nearly)
-  // minimal multiplication trees.
-  FPM.addPass(ReassociatePass());
-
-  // Add the primary loop simplification pipeline.
-  // FIXME: Currently this is split into two loop pass pipelines because we run
-  // some function passes in between them. These can and should be removed
-  // and/or replaced by scheduling the loop pass equivalents in the correct
-  // positions. But those equivalent passes aren't powerful enough yet.
-  // Specifically, `SimplifyCFGPass` and `InstCombinePass` are currently still
-  // used. We have `LoopSimplifyCFGPass` which isn't yet powerful enough yet to
-  // fully replace `SimplifyCFGPass`, and the closest to the other we have is
-  // `LoopInstSimplify`.
-  LoopPassManager LPM1, LPM2;
-
-  // Simplify the loop body. We do this initially to clean up after other loop
-  // passes run, either when iterating on a loop or on inner loops with
-  // implications on the outer loop.
-  LPM1.addPass(LoopInstSimplifyPass());
-  LPM1.addPass(LoopSimplifyCFGPass());
-
-  // Try to remove as much code from the loop header as possible,
-  // to reduce amount of IR that will have to be duplicated.
-  // TODO: Investigate promotion cap for O1.
-  LPM1.addPass(LICMPass(PTO.LicmMssaOptCap, PTO.LicmMssaNoAccForPromotionCap));
-
-  // Disable header duplication in loop rotation at -Oz.
-  LPM1.addPass(
-      LoopRotatePass(Level != OptimizationLevel::Oz, isLTOPreLink(Phase)));
-  // TODO: Investigate promotion cap for O1.
-  LPM1.addPass(LICMPass(PTO.LicmMssaOptCap, PTO.LicmMssaNoAccForPromotionCap));
-  LPM1.addPass(
-      SimpleLoopUnswitchPass(/* NonTrivial */ Level == OptimizationLevel::O3 &&
-                             EnableO3NonTrivialUnswitching));
-  LPM2.addPass(LoopIdiomRecognizePass());
-  LPM2.addPass(IndVarSimplifyPass());
-
-  for (auto &C : LateLoopOptimizationsEPCallbacks)
-    C(LPM2, Level);
-
-  LPM2.addPass(LoopDeletionPass());
-
-  if (EnableLoopInterchange)
-    LPM2.addPass(LoopInterchangePass());
-
-  // Do not enable unrolling in PreLinkThinLTO phase during sample PGO
-  // because it changes IR to makes profile annotation in back compile
-  // inaccurate. The normal unroller doesn't pay attention to forced full unroll
-  // attributes so we need to make sure and allow the full unroll pass to pay
-  // attention to it.
-  if (Phase != ThinOrFullLTOPhase::ThinLTOPreLink || !PGOOpt ||
-      PGOOpt->Action != PGOOptions::SampleUse)
-    LPM2.addPass(LoopFullUnrollPass(Level.getSpeedupLevel(),
-                                    /* OnlyWhenForced= */ !PTO.LoopUnrolling,
-                                    PTO.ForgetAllSCEVInLoopUnroll));
-
-  for (auto &C : LoopOptimizerEndEPCallbacks)
-    C(LPM2, Level);
-
-  // We provide the opt remark emitter pass for LICM to use. We only need to do
-  // this once as it is immutable.
-  FPM.addPass(
-      RequireAnalysisPass<OptimizationRemarkEmitterAnalysis, Function>());
-  FPM.addPass(createFunctionToLoopPassAdaptor(std::move(LPM1),
-                                              /*UseMemorySSA=*/true,
-                                              /*UseBlockFrequencyInfo=*/true));
-  FPM.addPass(SimplifyCFGPass());
-  FPM.addPass(InstCombinePass());
-  if (EnableLoopFlatten)
-    FPM.addPass(createFunctionToLoopPassAdaptor(LoopFlattenPass()));
-  // The loop passes in LPM2 (LoopIdiomRecognizePass, IndVarSimplifyPass,
-  // LoopDeletionPass and LoopFullUnrollPass) do not preserve MemorySSA.
-  // *All* loop passes must preserve it, in order to be able to use it.
-  FPM.addPass(createFunctionToLoopPassAdaptor(std::move(LPM2),
-                                              /*UseMemorySSA=*/false,
-                                              /*UseBlockFrequencyInfo=*/false));
-
-  // Delete small array after loop unroll.
-  FPM.addPass(SROA());
-
-  // Eliminate redundancies.
-  FPM.addPass(MergedLoadStoreMotionPass());
-  if (RunNewGVN)
-    FPM.addPass(NewGVNPass());
-  else
-    FPM.addPass(GVN());
-
-  // Sparse conditional constant propagation.
-  // FIXME: It isn't clear why we do this *after* loop passes rather than
-  // before...
-  FPM.addPass(SCCPPass());
-
-  // Delete dead bit computations (instcombine runs after to fold away the dead
-  // computations, and then ADCE will run later to exploit any new DCE
-  // opportunities that creates).
-  FPM.addPass(BDCEPass());
-
-  // Run instcombine after redundancy and dead bit elimination to exploit
-  // opportunities opened up by them.
-  FPM.addPass(InstCombinePass());
-  invokePeepholeEPCallbacks(FPM, Level);
-
-  // Re-consider control flow based optimizations after redundancy elimination,
-  // redo DCE, etc.
-  if (EnableDFAJumpThreading && Level.getSizeLevel() == 0)
-    FPM.addPass(DFAJumpThreadingPass());
-
-  FPM.addPass(JumpThreadingPass());
-  FPM.addPass(CorrelatedValuePropagationPass());
-
-  // Finally, do an expensive DCE pass to catch all the dead code exposed by
-  // the simplifications and basic cleanup after all the simplifications.
-  // TODO: Investigate if this is too expensive.
-  FPM.addPass(ADCEPass());
-
-  // Specially optimize memory movement as it doesn't look like dataflow in SSA.
-  FPM.addPass(MemCpyOptPass());
-
-  FPM.addPass(DSEPass());
-  FPM.addPass(createFunctionToLoopPassAdaptor(
-      LICMPass(PTO.LicmMssaOptCap, PTO.LicmMssaNoAccForPromotionCap),
-      /*UseMemorySSA=*/true, /*UseBlockFrequencyInfo=*/true));
-
-  FPM.addPass(CoroElidePass());
-
-  for (auto &C : ScalarOptimizerLateEPCallbacks)
-    C(FPM, Level);
-
-  FPM.addPass(SimplifyCFGPass(
-      SimplifyCFGOptions().hoistCommonInsts(true).sinkCommonInsts(true)));
-  FPM.addPass(InstCombinePass());
-  invokePeepholeEPCallbacks(FPM, Level);
-
-  if (EnableCHR && Level == OptimizationLevel::O3 && PGOOpt &&
-      (PGOOpt->Action == PGOOptions::IRUse ||
-       PGOOpt->Action == PGOOptions::SampleUse))
-    FPM.addPass(ControlHeightReductionPass());
-
-  return FPM;
-}
-
-void PassBuilder::addRequiredLTOPreLinkPasses(ModulePassManager &MPM) {
-  MPM.addPass(CanonicalizeAliasesPass());
-  MPM.addPass(NameAnonGlobalPass());
-}
-
-void PassBuilder::addPGOInstrPasses(ModulePassManager &MPM,
-                                    OptimizationLevel Level, bool RunProfileGen,
-                                    bool IsCS, std::string ProfileFile,
-                                    std::string ProfileRemappingFile) {
-  assert(Level != OptimizationLevel::O0 && "Not expecting O0 here!");
-  if (!IsCS && !DisablePreInliner) {
-    InlineParams IP;
-
-    IP.DefaultThreshold = PreInlineThreshold;
-
-    // FIXME: The hint threshold has the same value used by the regular inliner
-    // when not optimzing for size. This should probably be lowered after
-    // performance testing.
-    // FIXME: this comment is cargo culted from the old pass manager, revisit).
-    IP.HintThreshold = Level.isOptimizingForSize() ? PreInlineThreshold : 325;
-    ModuleInlinerWrapperPass MIWP(IP);
-    CGSCCPassManager &CGPipeline = MIWP.getPM();
-
-    FunctionPassManager FPM;
-    FPM.addPass(SROA());
-    FPM.addPass(EarlyCSEPass());    // Catch trivial redundancies.
-    FPM.addPass(SimplifyCFGPass()); // Merge & remove basic blocks.
-    FPM.addPass(InstCombinePass()); // Combine silly sequences.
-    invokePeepholeEPCallbacks(FPM, Level);
-
-    CGPipeline.addPass(createCGSCCToFunctionPassAdaptor(std::move(FPM)));
-
-    MPM.addPass(std::move(MIWP));
-
-    // Delete anything that is now dead to make sure that we don't instrument
-    // dead code. Instrumentation can end up keeping dead code around and
-    // dramatically increase code size.
-    MPM.addPass(GlobalDCEPass());
-  }
-
-  if (!RunProfileGen) {
-    assert(!ProfileFile.empty() && "Profile use expecting a profile file!");
-    MPM.addPass(PGOInstrumentationUse(ProfileFile, ProfileRemappingFile, IsCS));
-    // Cache ProfileSummaryAnalysis once to avoid the potential need to insert
-    // RequireAnalysisPass for PSI before subsequent non-module passes.
-    MPM.addPass(RequireAnalysisPass<ProfileSummaryAnalysis, Module>());
-    return;
-  }
-
-  // Perform PGO instrumentation.
-  MPM.addPass(PGOInstrumentationGen(IsCS));
-
-  FunctionPassManager FPM;
-  // Disable header duplication in loop rotation at -Oz.
-  FPM.addPass(createFunctionToLoopPassAdaptor(
-      LoopRotatePass(Level != OptimizationLevel::Oz), /*UseMemorySSA=*/false,
-      /*UseBlockFrequencyInfo=*/false));
-  MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
-
-  // Add the profile lowering pass.
-  InstrProfOptions Options;
-  if (!ProfileFile.empty())
-    Options.InstrProfileOutput = ProfileFile;
-  // Do counter promotion at Level greater than O0.
-  Options.DoCounterPromotion = true;
-  Options.UseBFIInPromotion = IsCS;
-  MPM.addPass(InstrProfiling(Options, IsCS));
-}
-
-void PassBuilder::addPGOInstrPassesForO0(ModulePassManager &MPM,
-                                         bool RunProfileGen, bool IsCS,
-                                         std::string ProfileFile,
-                                         std::string ProfileRemappingFile) {
-  if (!RunProfileGen) {
-    assert(!ProfileFile.empty() && "Profile use expecting a profile file!");
-    MPM.addPass(PGOInstrumentationUse(ProfileFile, ProfileRemappingFile, IsCS));
-    // Cache ProfileSummaryAnalysis once to avoid the potential need to insert
-    // RequireAnalysisPass for PSI before subsequent non-module passes.
-    MPM.addPass(RequireAnalysisPass<ProfileSummaryAnalysis, Module>());
-    return;
-  }
-
-  // Perform PGO instrumentation.
-  MPM.addPass(PGOInstrumentationGen(IsCS));
-  // Add the profile lowering pass.
-  InstrProfOptions Options;
-  if (!ProfileFile.empty())
-    Options.InstrProfileOutput = ProfileFile;
-  // Do not do counter promotion at O0.
-  Options.DoCounterPromotion = false;
-  Options.UseBFIInPromotion = IsCS;
-  MPM.addPass(InstrProfiling(Options, IsCS));
-}
-
-static InlineParams getInlineParamsFromOptLevel(OptimizationLevel Level) {
-  return getInlineParams(Level.getSpeedupLevel(), Level.getSizeLevel());
-}
-
-ModuleInlinerWrapperPass
-PassBuilder::buildInlinerPipeline(OptimizationLevel Level,
-                                  ThinOrFullLTOPhase Phase) {
-  InlineParams IP = getInlineParamsFromOptLevel(Level);
-  if (Phase == ThinOrFullLTOPhase::ThinLTOPreLink && PGOOpt &&
-      PGOOpt->Action == PGOOptions::SampleUse)
-    IP.HotCallSiteThreshold = 0;
-
-  if (PGOOpt)
-    IP.EnableDeferral = EnablePGOInlineDeferral;
-
-  ModuleInlinerWrapperPass MIWP(IP, PerformMandatoryInliningsFirst,
-                                UseInlineAdvisor, MaxDevirtIterations);
-
-  // Require the GlobalsAA analysis for the module so we can query it within
-  // the CGSCC pipeline.
-  MIWP.addModulePass(RequireAnalysisPass<GlobalsAA, Module>());
-  // Invalidate AAManager so it can be recreated and pick up the newly available
-  // GlobalsAA.
-  MIWP.addModulePass(
-      createModuleToFunctionPassAdaptor(InvalidateAnalysisPass<AAManager>()));
-
-  // Require the ProfileSummaryAnalysis for the module so we can query it within
-  // the inliner pass.
-  MIWP.addModulePass(RequireAnalysisPass<ProfileSummaryAnalysis, Module>());
-
-  // Now begin the main postorder CGSCC pipeline.
-  // FIXME: The current CGSCC pipeline has its origins in the legacy pass
-  // manager and trying to emulate its precise behavior. Much of this doesn't
-  // make a lot of sense and we should revisit the core CGSCC structure.
-  CGSCCPassManager &MainCGPipeline = MIWP.getPM();
-
-  // Note: historically, the PruneEH pass was run first to deduce nounwind and
-  // generally clean up exception handling overhead. It isn't clear this is
-  // valuable as the inliner doesn't currently care whether it is inlining an
-  // invoke or a call.
-
-  if (AttributorRun & AttributorRunOption::CGSCC)
-    MainCGPipeline.addPass(AttributorCGSCCPass());
-
-  // Now deduce any function attributes based in the current code.
-  MainCGPipeline.addPass(PostOrderFunctionAttrsPass());
-
-  // When at O3 add argument promotion to the pass pipeline.
-  // FIXME: It isn't at all clear why this should be limited to O3.
-  if (Level == OptimizationLevel::O3)
-    MainCGPipeline.addPass(ArgumentPromotionPass());
-
-  // Try to perform OpenMP specific optimizations. This is a (quick!) no-op if
-  // there are no OpenMP runtime calls present in the module.
-  if (Level == OptimizationLevel::O2 || Level == OptimizationLevel::O3)
-    MainCGPipeline.addPass(OpenMPOptCGSCCPass());
-
-  for (auto &C : CGSCCOptimizerLateEPCallbacks)
-    C(MainCGPipeline, Level);
-
-  // Lastly, add the core function simplification pipeline nested inside the
-  // CGSCC walk.
-  MainCGPipeline.addPass(createCGSCCToFunctionPassAdaptor(
-      buildFunctionSimplificationPipeline(Level, Phase)));
-
-  MainCGPipeline.addPass(CoroSplitPass(Level != OptimizationLevel::O0));
-
-  return MIWP;
-}
-
-ModulePassManager
-PassBuilder::buildModuleSimplificationPipeline(OptimizationLevel Level,
-                                               ThinOrFullLTOPhase Phase) {
-  ModulePassManager MPM;
-
-  // Place pseudo probe instrumentation as the first pass of the pipeline to
-  // minimize the impact of optimization changes.
-  if (PGOOpt && PGOOpt->PseudoProbeForProfiling &&
-      Phase != ThinOrFullLTOPhase::ThinLTOPostLink)
-    MPM.addPass(SampleProfileProbePass(TM));
-
-  bool HasSampleProfile = PGOOpt && (PGOOpt->Action == PGOOptions::SampleUse);
-
-  // In ThinLTO mode, when flattened profile is used, all the available
-  // profile information will be annotated in PreLink phase so there is
-  // no need to load the profile again in PostLink.
-  bool LoadSampleProfile =
-      HasSampleProfile &&
-      !(FlattenedProfileUsed && Phase == ThinOrFullLTOPhase::ThinLTOPostLink);
-
-  // During the ThinLTO backend phase we perform early indirect call promotion
-  // here, before globalopt. Otherwise imported available_externally functions
-  // look unreferenced and are removed. If we are going to load the sample
-  // profile then defer until later.
-  // TODO: See if we can move later and consolidate with the location where
-  // we perform ICP when we are loading a sample profile.
-  // TODO: We pass HasSampleProfile (whether there was a sample profile file
-  // passed to the compile) to the SamplePGO flag of ICP. This is used to
-  // determine whether the new direct calls are annotated with prof metadata.
-  // Ideally this should be determined from whether the IR is annotated with
-  // sample profile, and not whether the a sample profile was provided on the
-  // command line. E.g. for flattened profiles where we will not be reloading
-  // the sample profile in the ThinLTO backend, we ideally shouldn't have to
-  // provide the sample profile file.
-  if (Phase == ThinOrFullLTOPhase::ThinLTOPostLink && !LoadSampleProfile)
-    MPM.addPass(PGOIndirectCallPromotion(true /* InLTO */, HasSampleProfile));
-
-  // Do basic inference of function attributes from known properties of system
-  // libraries and other oracles.
-  MPM.addPass(InferFunctionAttrsPass());
-
-  // Create an early function pass manager to cleanup the output of the
-  // frontend.
-  FunctionPassManager EarlyFPM;
-  // Lower llvm.expect to metadata before attempting transforms.
-  // Compare/branch metadata may alter the behavior of passes like SimplifyCFG.
-  EarlyFPM.addPass(LowerExpectIntrinsicPass());
-  EarlyFPM.addPass(SimplifyCFGPass());
-  EarlyFPM.addPass(SROA());
-  EarlyFPM.addPass(EarlyCSEPass());
-  EarlyFPM.addPass(CoroEarlyPass());
-  if (Level == OptimizationLevel::O3)
-    EarlyFPM.addPass(CallSiteSplittingPass());
-
-  // In SamplePGO ThinLTO backend, we need instcombine before profile annotation
-  // to convert bitcast to direct calls so that they can be inlined during the
-  // profile annotation prepration step.
-  // More details about SamplePGO design can be found in:
-  // https://research.google.com/pubs/pub45290.html
-  // FIXME: revisit how SampleProfileLoad/Inliner/ICP is structured.
-  if (LoadSampleProfile)
-    EarlyFPM.addPass(InstCombinePass());
-  MPM.addPass(createModuleToFunctionPassAdaptor(std::move(EarlyFPM)));
-
-  if (LoadSampleProfile) {
-    // Annotate sample profile right after early FPM to ensure freshness of
-    // the debug info.
-    MPM.addPass(SampleProfileLoaderPass(PGOOpt->ProfileFile,
-                                        PGOOpt->ProfileRemappingFile, Phase));
-    // Cache ProfileSummaryAnalysis once to avoid the potential need to insert
-    // RequireAnalysisPass for PSI before subsequent non-module passes.
-    MPM.addPass(RequireAnalysisPass<ProfileSummaryAnalysis, Module>());
-    // Do not invoke ICP in the LTOPrelink phase as it makes it hard
-    // for the profile annotation to be accurate in the LTO backend.
-    if (Phase != ThinOrFullLTOPhase::ThinLTOPreLink &&
-        Phase != ThinOrFullLTOPhase::FullLTOPreLink)
-      // We perform early indirect call promotion here, before globalopt.
-      // This is important for the ThinLTO backend phase because otherwise
-      // imported available_externally functions look unreferenced and are
-      // removed.
-      MPM.addPass(
-          PGOIndirectCallPromotion(true /* IsInLTO */, true /* SamplePGO */));
-  }
-
-  // Try to perform OpenMP specific optimizations on the module. This is a
-  // (quick!) no-op if there are no OpenMP runtime calls present in the module.
-  if (Level != OptimizationLevel::O0)
-    MPM.addPass(OpenMPOptPass());
-
-  if (AttributorRun & AttributorRunOption::MODULE)
-    MPM.addPass(AttributorPass());
-
-  // Lower type metadata and the type.test intrinsic in the ThinLTO
-  // post link pipeline after ICP. This is to enable usage of the type
-  // tests in ICP sequences.
-  if (Phase == ThinOrFullLTOPhase::ThinLTOPostLink)
-    MPM.addPass(LowerTypeTestsPass(nullptr, nullptr, true));
-
-  for (auto &C : PipelineEarlySimplificationEPCallbacks)
-    C(MPM, Level);
-
-  // Specialize functions with IPSCCP.
-  if (EnableFunctionSpecialization)
-    MPM.addPass(FunctionSpecializationPass());
-
-  // Interprocedural constant propagation now that basic cleanup has occurred
-  // and prior to optimizing globals.
-  // FIXME: This position in the pipeline hasn't been carefully considered in
-  // years, it should be re-analyzed.
-  MPM.addPass(IPSCCPPass());
-
-  // Attach metadata to indirect call sites indicating the set of functions
-  // they may target at run-time. This should follow IPSCCP.
-  MPM.addPass(CalledValuePropagationPass());
-
-  // Optimize globals to try and fold them into constants.
-  MPM.addPass(GlobalOptPass());
-
-  // Promote any localized globals to SSA registers.
-  // FIXME: Should this instead by a run of SROA?
-  // FIXME: We should probably run instcombine and simplifycfg afterward to
-  // delete control flows that are dead once globals have been folded to
-  // constants.
-  MPM.addPass(createModuleToFunctionPassAdaptor(PromotePass()));
-
-  // Remove any dead arguments exposed by cleanups and constant folding
-  // globals.
-  MPM.addPass(DeadArgumentEliminationPass());
-
-  // Create a small function pass pipeline to cleanup after all the global
-  // optimizations.
-  FunctionPassManager GlobalCleanupPM;
-  GlobalCleanupPM.addPass(InstCombinePass());
-  invokePeepholeEPCallbacks(GlobalCleanupPM, Level);
-
-  GlobalCleanupPM.addPass(SimplifyCFGPass());
-  MPM.addPass(createModuleToFunctionPassAdaptor(std::move(GlobalCleanupPM)));
-
-  // Add all the requested passes for instrumentation PGO, if requested.
-  if (PGOOpt && Phase != ThinOrFullLTOPhase::ThinLTOPostLink &&
-      (PGOOpt->Action == PGOOptions::IRInstr ||
-       PGOOpt->Action == PGOOptions::IRUse)) {
-    addPGOInstrPasses(MPM, Level,
-                      /* RunProfileGen */ PGOOpt->Action == PGOOptions::IRInstr,
-                      /* IsCS */ false, PGOOpt->ProfileFile,
-                      PGOOpt->ProfileRemappingFile);
-    MPM.addPass(PGOIndirectCallPromotion(false, false));
-  }
-  if (PGOOpt && Phase != ThinOrFullLTOPhase::ThinLTOPostLink &&
-      PGOOpt->CSAction == PGOOptions::CSIRInstr)
-    MPM.addPass(PGOInstrumentationGenCreateVar(PGOOpt->CSProfileGenFile));
-
-  // Synthesize function entry counts for non-PGO compilation.
-  if (EnableSyntheticCounts && !PGOOpt)
-    MPM.addPass(SyntheticCountsPropagation());
-
-  MPM.addPass(buildInlinerPipeline(Level, Phase));
-
-  if (EnableMemProfiler && Phase != ThinOrFullLTOPhase::ThinLTOPreLink) {
-    MPM.addPass(createModuleToFunctionPassAdaptor(MemProfilerPass()));
-    MPM.addPass(ModuleMemProfilerPass());
-  }
-
-  return MPM;
-}
-
-/// TODO: Should LTO cause any differences to this set of passes?
-void PassBuilder::addVectorPasses(OptimizationLevel Level,
-                                  FunctionPassManager &FPM, bool IsFullLTO) {
-  FPM.addPass(LoopVectorizePass(
-      LoopVectorizeOptions(!PTO.LoopInterleaving, !PTO.LoopVectorization)));
-
-  if (IsFullLTO) {
-    // The vectorizer may have significantly shortened a loop body; unroll
-    // again. Unroll small loops to hide loop backedge latency and saturate any
-    // parallel execution resources of an out-of-order processor. We also then
-    // need to clean up redundancies and loop invariant code.
-    // FIXME: It would be really good to use a loop-integrated instruction
-    // combiner for cleanup here so that the unrolling and LICM can be pipelined
-    // across the loop nests.
-    // We do UnrollAndJam in a separate LPM to ensure it happens before unroll
-    if (EnableUnrollAndJam && PTO.LoopUnrolling)
-      FPM.addPass(createFunctionToLoopPassAdaptor(
-          LoopUnrollAndJamPass(Level.getSpeedupLevel())));
-    FPM.addPass(LoopUnrollPass(LoopUnrollOptions(
-        Level.getSpeedupLevel(), /*OnlyWhenForced=*/!PTO.LoopUnrolling,
-        PTO.ForgetAllSCEVInLoopUnroll)));
-    FPM.addPass(WarnMissedTransformationsPass());
-  }
-
-  if (!IsFullLTO) {
-    // Eliminate loads by forwarding stores from the previous iteration to loads
-    // of the current iteration.
-    FPM.addPass(LoopLoadEliminationPass());
-  }
-  // Cleanup after the loop optimization passes.
-  FPM.addPass(InstCombinePass());
-
-  if (Level.getSpeedupLevel() > 1 && ExtraVectorizerPasses) {
-    // At higher optimization levels, try to clean up any runtime overlap and
-    // alignment checks inserted by the vectorizer. We want to track correlated
-    // runtime checks for two inner loops in the same outer loop, fold any
-    // common computations, hoist loop-invariant aspects out of any outer loop,
-    // and unswitch the runtime checks if possible. Once hoisted, we may have
-    // dead (or speculatable) control flows or more combining opportunities.
-    FPM.addPass(EarlyCSEPass());
-    FPM.addPass(CorrelatedValuePropagationPass());
-    FPM.addPass(InstCombinePass());
-    LoopPassManager LPM;
-    LPM.addPass(LICMPass(PTO.LicmMssaOptCap, PTO.LicmMssaNoAccForPromotionCap));
-    LPM.addPass(SimpleLoopUnswitchPass(/* NonTrivial */ Level ==
-                                       OptimizationLevel::O3));
-    FPM.addPass(
-        RequireAnalysisPass<OptimizationRemarkEmitterAnalysis, Function>());
-    FPM.addPass(
-        createFunctionToLoopPassAdaptor(std::move(LPM), /*UseMemorySSA=*/true,
-                                        /*UseBlockFrequencyInfo=*/true));
-    FPM.addPass(SimplifyCFGPass());
-    FPM.addPass(InstCombinePass());
-  }
-
-  // Now that we've formed fast to execute loop structures, we do further
-  // optimizations. These are run afterward as they might block doing complex
-  // analyses and transforms such as what are needed for loop vectorization.
-
-  // Cleanup after loop vectorization, etc. Simplification passes like CVP and
-  // GVN, loop transforms, and others have already run, so it's now better to
-  // convert to more optimized IR using more aggressive simplify CFG options.
-  // The extra sinking transform can create larger basic blocks, so do this
-  // before SLP vectorization.
-  FPM.addPass(SimplifyCFGPass(SimplifyCFGOptions()
-                                  .forwardSwitchCondToPhi(true)
-                                  .convertSwitchToLookupTable(true)
-                                  .needCanonicalLoops(false)
-                                  .hoistCommonInsts(true)
-                                  .sinkCommonInsts(true)));
-
-  if (IsFullLTO) {
-    FPM.addPass(SCCPPass());
-    FPM.addPass(InstCombinePass());
-    FPM.addPass(BDCEPass());
-  }
-
-  // Optimize parallel scalar instruction chains into SIMD instructions.
-  if (PTO.SLPVectorization) {
-    FPM.addPass(SLPVectorizerPass());
-    if (Level.getSpeedupLevel() > 1 && ExtraVectorizerPasses) {
-      FPM.addPass(EarlyCSEPass());
-    }
-  }
-  // Enhance/cleanup vector code.
-  FPM.addPass(VectorCombinePass());
-
-  if (!IsFullLTO) {
-    FPM.addPass(InstCombinePass());
-    // Unroll small loops to hide loop backedge latency and saturate any
-    // parallel execution resources of an out-of-order processor. We also then
-    // need to clean up redundancies and loop invariant code.
-    // FIXME: It would be really good to use a loop-integrated instruction
-    // combiner for cleanup here so that the unrolling and LICM can be pipelined
-    // across the loop nests.
-    // We do UnrollAndJam in a separate LPM to ensure it happens before unroll
-    if (EnableUnrollAndJam && PTO.LoopUnrolling) {
-      FPM.addPass(createFunctionToLoopPassAdaptor(
-          LoopUnrollAndJamPass(Level.getSpeedupLevel())));
-    }
-    FPM.addPass(LoopUnrollPass(LoopUnrollOptions(
-        Level.getSpeedupLevel(), /*OnlyWhenForced=*/!PTO.LoopUnrolling,
-        PTO.ForgetAllSCEVInLoopUnroll)));
-    FPM.addPass(WarnMissedTransformationsPass());
-    FPM.addPass(InstCombinePass());
-    FPM.addPass(
-        RequireAnalysisPass<OptimizationRemarkEmitterAnalysis, Function>());
-    FPM.addPass(createFunctionToLoopPassAdaptor(
-        LICMPass(PTO.LicmMssaOptCap, PTO.LicmMssaNoAccForPromotionCap),
-        /*UseMemorySSA=*/true, /*UseBlockFrequencyInfo=*/true));
-  }
-
-  // Now that we've vectorized and unrolled loops, we may have more refined
-  // alignment information, try to re-derive it here.
-  FPM.addPass(AlignmentFromAssumptionsPass());
-
-  if (IsFullLTO)
-    FPM.addPass(InstCombinePass());
-}
-
-ModulePassManager
-PassBuilder::buildModuleOptimizationPipeline(OptimizationLevel Level,
-                                             bool LTOPreLink) {
-  ModulePassManager MPM;
-
-  // Optimize globals now that the module is fully simplified.
-  MPM.addPass(GlobalOptPass());
-  MPM.addPass(GlobalDCEPass());
-
-  // Run partial inlining pass to partially inline functions that have
-  // large bodies.
-  if (RunPartialInlining)
-    MPM.addPass(PartialInlinerPass());
-
-  // Remove avail extern fns and globals definitions since we aren't compiling
-  // an object file for later LTO. For LTO we want to preserve these so they
-  // are eligible for inlining at link-time. Note if they are unreferenced they
-  // will be removed by GlobalDCE later, so this only impacts referenced
-  // available externally globals. Eventually they will be suppressed during
-  // codegen, but eliminating here enables more opportunity for GlobalDCE as it
-  // may make globals referenced by available external functions dead and saves
-  // running remaining passes on the eliminated functions. These should be
-  // preserved during prelinking for link-time inlining decisions.
-  if (!LTOPreLink)
-    MPM.addPass(EliminateAvailableExternallyPass());
-
-  if (EnableOrderFileInstrumentation)
-    MPM.addPass(InstrOrderFilePass());
-
-  // Do RPO function attribute inference across the module to forward-propagate
-  // attributes where applicable.
-  // FIXME: Is this really an optimization rather than a canonicalization?
-  MPM.addPass(ReversePostOrderFunctionAttrsPass());
-
-  // Do a post inline PGO instrumentation and use pass. This is a context
-  // sensitive PGO pass. We don't want to do this in LTOPreLink phrase as
-  // cross-module inline has not been done yet. The context sensitive
-  // instrumentation is after all the inlines are done.
-  if (!LTOPreLink && PGOOpt) {
-    if (PGOOpt->CSAction == PGOOptions::CSIRInstr)
-      addPGOInstrPasses(MPM, Level, /* RunProfileGen */ true,
-                        /* IsCS */ true, PGOOpt->CSProfileGenFile,
-                        PGOOpt->ProfileRemappingFile);
-    else if (PGOOpt->CSAction == PGOOptions::CSIRUse)
-      addPGOInstrPasses(MPM, Level, /* RunProfileGen */ false,
-                        /* IsCS */ true, PGOOpt->ProfileFile,
-                        PGOOpt->ProfileRemappingFile);
-  }
-
-  // Re-require GloblasAA here prior to function passes. This is particularly
-  // useful as the above will have inlined, DCE'ed, and function-attr
-  // propagated everything. We should at this point have a reasonably minimal
-  // and richly annotated call graph. By computing aliasing and mod/ref
-  // information for all local globals here, the late loop passes and notably
-  // the vectorizer will be able to use them to help recognize vectorizable
-  // memory operations.
-  MPM.addPass(RequireAnalysisPass<GlobalsAA, Module>());
-
-  FunctionPassManager OptimizePM;
-  OptimizePM.addPass(Float2IntPass());
-  OptimizePM.addPass(LowerConstantIntrinsicsPass());
-
-  if (EnableMatrix) {
-    OptimizePM.addPass(LowerMatrixIntrinsicsPass());
-    OptimizePM.addPass(EarlyCSEPass());
-  }
-
-  // FIXME: We need to run some loop optimizations to re-rotate loops after
-  // simplifycfg and others undo their rotation.
-
-  // Optimize the loop execution. These passes operate on entire loop nests
-  // rather than on each loop in an inside-out manner, and so they are actually
-  // function passes.
-
-  for (auto &C : VectorizerStartEPCallbacks)
-    C(OptimizePM, Level);
-
-  // First rotate loops that may have been un-rotated by prior passes.
-  // Disable header duplication at -Oz.
-  OptimizePM.addPass(createFunctionToLoopPassAdaptor(
-      LoopRotatePass(Level != OptimizationLevel::Oz, LTOPreLink),
-      /*UseMemorySSA=*/false, /*UseBlockFrequencyInfo=*/false));
-
-  // Distribute loops to allow partial vectorization.  I.e. isolate dependences
-  // into separate loop that would otherwise inhibit vectorization.  This is
-  // currently only performed for loops marked with the metadata
-  // llvm.loop.distribute=true or when -enable-loop-distribute is specified.
-  OptimizePM.addPass(LoopDistributePass());
-
-  // Populates the VFABI attribute with the scalar-to-vector mappings
-  // from the TargetLibraryInfo.
-  OptimizePM.addPass(InjectTLIMappings());
-
-  addVectorPasses(Level, OptimizePM, /* IsFullLTO */ false);
-
-  // Split out cold code. Splitting is done late to avoid hiding context from
-  // other optimizations and inadvertently regressing performance. The tradeoff
-  // is that this has a higher code size cost than splitting early.
-  if (EnableHotColdSplit && !LTOPreLink)
-    MPM.addPass(HotColdSplittingPass());
-
-  // Search the code for similar regions of code. If enough similar regions can
-  // be found where extracting the regions into their own function will decrease
-  // the size of the program, we extract the regions, a deduplicate the
-  // structurally similar regions.
-  if (EnableIROutliner)
-    MPM.addPass(IROutlinerPass());
-
-  // Merge functions if requested.
-  if (PTO.MergeFunctions)
-    MPM.addPass(MergeFunctionsPass());
-
-  // LoopSink pass sinks instructions hoisted by LICM, which serves as a
-  // canonicalization pass that enables other optimizations. As a result,
-  // LoopSink pass needs to be a very late IR pass to avoid undoing LICM
-  // result too early.
-  OptimizePM.addPass(LoopSinkPass());
-
-  // And finally clean up LCSSA form before generating code.
-  OptimizePM.addPass(InstSimplifyPass());
-
-  // This hoists/decomposes div/rem ops. It should run after other sink/hoist
-  // passes to avoid re-sinking, but before SimplifyCFG because it can allow
-  // flattening of blocks.
-  OptimizePM.addPass(DivRemPairsPass());
-
-  // LoopSink (and other loop passes since the last simplifyCFG) might have
-  // resulted in single-entry-single-exit or empty blocks. Clean up the CFG.
-  OptimizePM.addPass(SimplifyCFGPass());
-
-  OptimizePM.addPass(CoroCleanupPass());
-
-  // Add the core optimizing pipeline.
-  MPM.addPass(createModuleToFunctionPassAdaptor(std::move(OptimizePM)));
-
-  for (auto &C : OptimizerLastEPCallbacks)
-    C(MPM, Level);
-
-  if (PTO.CallGraphProfile)
-    MPM.addPass(CGProfilePass());
-
-  // Now we need to do some global optimization transforms.
-  // FIXME: It would seem like these should come first in the optimization
-  // pipeline and maybe be the bottom of the canonicalization pipeline? Weird
-  // ordering here.
-  MPM.addPass(GlobalDCEPass());
-  MPM.addPass(ConstantMergePass());
-
-  // TODO: Relative look table converter pass caused an issue when full lto is
-  // enabled. See https://reviews.llvm.org/D94355 for more details.
-  // Until the issue fixed, disable this pass during pre-linking phase.
-  if (!LTOPreLink)
-    MPM.addPass(RelLookupTableConverterPass());
-
-  return MPM;
-}
-
-ModulePassManager
-PassBuilder::buildPerModuleDefaultPipeline(OptimizationLevel Level,
-                                           bool LTOPreLink) {
-  assert(Level != OptimizationLevel::O0 &&
-         "Must request optimizations for the default pipeline!");
-
-  ModulePassManager MPM;
-
-  // Convert @llvm.global.annotations to !annotation metadata.
-  MPM.addPass(Annotation2MetadataPass());
-
-  // Force any function attributes we want the rest of the pipeline to observe.
-  MPM.addPass(ForceFunctionAttrsPass());
-
-  // Apply module pipeline start EP callback.
-  for (auto &C : PipelineStartEPCallbacks)
-    C(MPM, Level);
-
-  if (PGOOpt && PGOOpt->DebugInfoForProfiling)
-    MPM.addPass(createModuleToFunctionPassAdaptor(AddDiscriminatorsPass()));
-
-  // Add the core simplification pipeline.
-  MPM.addPass(buildModuleSimplificationPipeline(
-      Level, LTOPreLink ? ThinOrFullLTOPhase::FullLTOPreLink
-                        : ThinOrFullLTOPhase::None));
-
-  // Now add the optimization pipeline.
-  MPM.addPass(buildModuleOptimizationPipeline(Level, LTOPreLink));
-
-  if (PGOOpt && PGOOpt->PseudoProbeForProfiling)
-    MPM.addPass(PseudoProbeUpdatePass());
-
-  // Emit annotation remarks.
-  addAnnotationRemarksPass(MPM);
-
-  if (LTOPreLink)
-    addRequiredLTOPreLinkPasses(MPM);
-
-  return MPM;
-}
-
-ModulePassManager
-PassBuilder::buildThinLTOPreLinkDefaultPipeline(OptimizationLevel Level) {
-  assert(Level != OptimizationLevel::O0 &&
-         "Must request optimizations for the default pipeline!");
-
-  ModulePassManager MPM;
-
-  // Convert @llvm.global.annotations to !annotation metadata.
-  MPM.addPass(Annotation2MetadataPass());
-
-  // Force any function attributes we want the rest of the pipeline to observe.
-  MPM.addPass(ForceFunctionAttrsPass());
-
-  if (PGOOpt && PGOOpt->DebugInfoForProfiling)
-    MPM.addPass(createModuleToFunctionPassAdaptor(AddDiscriminatorsPass()));
-
-  // Apply module pipeline start EP callback.
-  for (auto &C : PipelineStartEPCallbacks)
-    C(MPM, Level);
-
-  // If we are planning to perform ThinLTO later, we don't bloat the code with
-  // unrolling/vectorization/... now. Just simplify the module as much as we
-  // can.
-  MPM.addPass(buildModuleSimplificationPipeline(
-      Level, ThinOrFullLTOPhase::ThinLTOPreLink));
-
-  // Run partial inlining pass to partially inline functions that have
-  // large bodies.
-  // FIXME: It isn't clear whether this is really the right place to run this
-  // in ThinLTO. Because there is another canonicalization and simplification
-  // phase that will run after the thin link, running this here ends up with
-  // less information than will be available later and it may grow functions in
-  // ways that aren't beneficial.
-  if (RunPartialInlining)
-    MPM.addPass(PartialInlinerPass());
-
-  // Reduce the size of the IR as much as possible.
-  MPM.addPass(GlobalOptPass());
-
-  // Module simplification splits coroutines, but does not fully clean up
-  // coroutine intrinsics. To ensure ThinLTO optimization passes don't trip up
-  // on these, we schedule the cleanup here.
-  MPM.addPass(createModuleToFunctionPassAdaptor(CoroCleanupPass()));
-
-  if (PGOOpt && PGOOpt->PseudoProbeForProfiling)
-    MPM.addPass(PseudoProbeUpdatePass());
-
-  // Handle OptimizerLastEPCallbacks added by clang on PreLink. Actual
-  // optimization is going to be done in PostLink stage, but clang can't
-  // add callbacks there in case of in-process ThinLTO called by linker.
-  for (auto &C : OptimizerLastEPCallbacks)
-    C(MPM, Level);
-
-  // Emit annotation remarks.
-  addAnnotationRemarksPass(MPM);
-
-  addRequiredLTOPreLinkPasses(MPM);
-
-  return MPM;
-}
-
-ModulePassManager PassBuilder::buildThinLTODefaultPipeline(
-    OptimizationLevel Level, const ModuleSummaryIndex *ImportSummary) {
-  ModulePassManager MPM;
-
-  // Convert @llvm.global.annotations to !annotation metadata.
-  MPM.addPass(Annotation2MetadataPass());
-
-  if (ImportSummary) {
-    // These passes import type identifier resolutions for whole-program
-    // devirtualization and CFI. They must run early because other passes may
-    // disturb the specific instruction patterns that these passes look for,
-    // creating dependencies on resolutions that may not appear in the summary.
-    //
-    // For example, GVN may transform the pattern assume(type.test) appearing in
-    // two basic blocks into assume(phi(type.test, type.test)), which would
-    // transform a dependency on a WPD resolution into a dependency on a type
-    // identifier resolution for CFI.
-    //
-    // Also, WPD has access to more precise information than ICP and can
-    // devirtualize more effectively, so it should operate on the IR first.
-    //
-    // The WPD and LowerTypeTest passes need to run at -O0 to lower type
-    // metadata and intrinsics.
-    MPM.addPass(WholeProgramDevirtPass(nullptr, ImportSummary));
-    MPM.addPass(LowerTypeTestsPass(nullptr, ImportSummary));
-  }
-
-  if (Level == OptimizationLevel::O0) {
-    // Run a second time to clean up any type tests left behind by WPD for use
-    // in ICP.
-    MPM.addPass(LowerTypeTestsPass(nullptr, nullptr, true));
-    // Drop available_externally and unreferenced globals. This is necessary
-    // with ThinLTO in order to avoid leaving undefined references to dead
-    // globals in the object file.
-    MPM.addPass(EliminateAvailableExternallyPass());
-    MPM.addPass(GlobalDCEPass());
-    return MPM;
-  }
-
-  // Force any function attributes we want the rest of the pipeline to observe.
-  MPM.addPass(ForceFunctionAttrsPass());
-
-  // Add the core simplification pipeline.
-  MPM.addPass(buildModuleSimplificationPipeline(
-      Level, ThinOrFullLTOPhase::ThinLTOPostLink));
-
-  // Now add the optimization pipeline.
-  MPM.addPass(buildModuleOptimizationPipeline(Level));
-
-  // Emit annotation remarks.
-  addAnnotationRemarksPass(MPM);
-
-  return MPM;
-}
-
-ModulePassManager
-PassBuilder::buildLTOPreLinkDefaultPipeline(OptimizationLevel Level) {
-  assert(Level != OptimizationLevel::O0 &&
-         "Must request optimizations for the default pipeline!");
-  // FIXME: We should use a customized pre-link pipeline!
-  return buildPerModuleDefaultPipeline(Level,
-                                       /* LTOPreLink */ true);
-}
-
-ModulePassManager
-PassBuilder::buildLTODefaultPipeline(OptimizationLevel Level,
-                                     ModuleSummaryIndex *ExportSummary) {
-  ModulePassManager MPM;
-
-  // Convert @llvm.global.annotations to !annotation metadata.
-  MPM.addPass(Annotation2MetadataPass());
-
-  // Create a function that performs CFI checks for cross-DSO calls with targets
-  // in the current module.
-  MPM.addPass(CrossDSOCFIPass());
-
-  if (Level == OptimizationLevel::O0) {
-    // The WPD and LowerTypeTest passes need to run at -O0 to lower type
-    // metadata and intrinsics.
-    MPM.addPass(WholeProgramDevirtPass(ExportSummary, nullptr));
-    MPM.addPass(LowerTypeTestsPass(ExportSummary, nullptr));
-    // Run a second time to clean up any type tests left behind by WPD for use
-    // in ICP.
-    MPM.addPass(LowerTypeTestsPass(nullptr, nullptr, true));
-
-    // Emit annotation remarks.
-    addAnnotationRemarksPass(MPM);
-
-    return MPM;
-  }
-
-  if (PGOOpt && PGOOpt->Action == PGOOptions::SampleUse) {
-    // Load sample profile before running the LTO optimization pipeline.
-    MPM.addPass(SampleProfileLoaderPass(PGOOpt->ProfileFile,
-                                        PGOOpt->ProfileRemappingFile,
-                                        ThinOrFullLTOPhase::FullLTOPostLink));
-    // Cache ProfileSummaryAnalysis once to avoid the potential need to insert
-    // RequireAnalysisPass for PSI before subsequent non-module passes.
-    MPM.addPass(RequireAnalysisPass<ProfileSummaryAnalysis, Module>());
-  }
-
-  // Remove unused virtual tables to improve the quality of code generated by
-  // whole-program devirtualization and bitset lowering.
-  MPM.addPass(GlobalDCEPass());
-
-  // Force any function attributes we want the rest of the pipeline to observe.
-  MPM.addPass(ForceFunctionAttrsPass());
-
-  // Do basic inference of function attributes from known properties of system
-  // libraries and other oracles.
-  MPM.addPass(InferFunctionAttrsPass());
-
-  if (Level.getSpeedupLevel() > 1) {
-    FunctionPassManager EarlyFPM;
-    EarlyFPM.addPass(CallSiteSplittingPass());
-    MPM.addPass(createModuleToFunctionPassAdaptor(std::move(EarlyFPM)));
-
-    // Indirect call promotion. This should promote all the targets that are
-    // left by the earlier promotion pass that promotes intra-module targets.
-    // This two-step promotion is to save the compile time. For LTO, it should
-    // produce the same result as if we only do promotion here.
-    MPM.addPass(PGOIndirectCallPromotion(
-        true /* InLTO */, PGOOpt && PGOOpt->Action == PGOOptions::SampleUse));
-
-    if (EnableFunctionSpecialization)
-      MPM.addPass(FunctionSpecializationPass());
-    // Propagate constants at call sites into the functions they call.  This
-    // opens opportunities for globalopt (and inlining) by substituting function
-    // pointers passed as arguments to direct uses of functions.
-    MPM.addPass(IPSCCPPass());
-
-    // Attach metadata to indirect call sites indicating the set of functions
-    // they may target at run-time. This should follow IPSCCP.
-    MPM.addPass(CalledValuePropagationPass());
-  }
-
-  // Now deduce any function attributes based in the current code.
-  MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(
-              PostOrderFunctionAttrsPass()));
-
-  // Do RPO function attribute inference across the module to forward-propagate
-  // attributes where applicable.
-  // FIXME: Is this really an optimization rather than a canonicalization?
-  MPM.addPass(ReversePostOrderFunctionAttrsPass());
-
-  // Use in-range annotations on GEP indices to split globals where beneficial.
-  MPM.addPass(GlobalSplitPass());
-
-  // Run whole program optimization of virtual call when the list of callees
-  // is fixed.
-  MPM.addPass(WholeProgramDevirtPass(ExportSummary, nullptr));
-
-  // Stop here at -O1.
-  if (Level == OptimizationLevel::O1) {
-    // The LowerTypeTestsPass needs to run to lower type metadata and the
-    // type.test intrinsics. The pass does nothing if CFI is disabled.
-    MPM.addPass(LowerTypeTestsPass(ExportSummary, nullptr));
-    // Run a second time to clean up any type tests left behind by WPD for use
-    // in ICP (which is performed earlier than this in the regular LTO
-    // pipeline).
-    MPM.addPass(LowerTypeTestsPass(nullptr, nullptr, true));
-
-    // Emit annotation remarks.
-    addAnnotationRemarksPass(MPM);
-
-    return MPM;
-  }
-
-  // Optimize globals to try and fold them into constants.
-  MPM.addPass(GlobalOptPass());
-
-  // Promote any localized globals to SSA registers.
-  MPM.addPass(createModuleToFunctionPassAdaptor(PromotePass()));
-
-  // Linking modules together can lead to duplicate global constant, only
-  // keep one copy of each constant.
-  MPM.addPass(ConstantMergePass());
-
-  // Remove unused arguments from functions.
-  MPM.addPass(DeadArgumentEliminationPass());
-
-  // Reduce the code after globalopt and ipsccp.  Both can open up significant
-  // simplification opportunities, and both can propagate functions through
-  // function pointers.  When this happens, we often have to resolve varargs
-  // calls, etc, so let instcombine do this.
-  FunctionPassManager PeepholeFPM;
-  if (Level == OptimizationLevel::O3)
-    PeepholeFPM.addPass(AggressiveInstCombinePass());
-  PeepholeFPM.addPass(InstCombinePass());
-  invokePeepholeEPCallbacks(PeepholeFPM, Level);
-
-  MPM.addPass(createModuleToFunctionPassAdaptor(std::move(PeepholeFPM)));
-
-  // Note: historically, the PruneEH pass was run first to deduce nounwind and
-  // generally clean up exception handling overhead. It isn't clear this is
-  // valuable as the inliner doesn't currently care whether it is inlining an
-  // invoke or a call.
-  // Run the inliner now.
-  MPM.addPass(ModuleInlinerWrapperPass(getInlineParamsFromOptLevel(Level)));
-
-  // Optimize globals again after we ran the inliner.
-  MPM.addPass(GlobalOptPass());
-
-  // Garbage collect dead functions.
-  MPM.addPass(GlobalDCEPass());
-
-  // If we didn't decide to inline a function, check to see if we can
-  // transform it to pass arguments by value instead of by reference.
-  MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(ArgumentPromotionPass()));
-
-  FunctionPassManager FPM;
-  // The IPO Passes may leave cruft around. Clean up after them.
-  FPM.addPass(InstCombinePass());
-  invokePeepholeEPCallbacks(FPM, Level);
-
-  FPM.addPass(JumpThreadingPass(/*InsertFreezeWhenUnfoldingSelect*/ true));
-
-  // Do a post inline PGO instrumentation and use pass. This is a context
-  // sensitive PGO pass.
-  if (PGOOpt) {
-    if (PGOOpt->CSAction == PGOOptions::CSIRInstr)
-      addPGOInstrPasses(MPM, Level, /* RunProfileGen */ true,
-                        /* IsCS */ true, PGOOpt->CSProfileGenFile,
-                        PGOOpt->ProfileRemappingFile);
-    else if (PGOOpt->CSAction == PGOOptions::CSIRUse)
-      addPGOInstrPasses(MPM, Level, /* RunProfileGen */ false,
-                        /* IsCS */ true, PGOOpt->ProfileFile,
-                        PGOOpt->ProfileRemappingFile);
-  }
-
-  // Break up allocas
-  FPM.addPass(SROA());
-
-  // LTO provides additional opportunities for tailcall elimination due to
-  // link-time inlining, and visibility of nocapture attribute.
-  FPM.addPass(TailCallElimPass());
-
-  // Run a few AA driver optimizations here and now to cleanup the code.
-  MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
-
-  MPM.addPass(
-      createModuleToPostOrderCGSCCPassAdaptor(PostOrderFunctionAttrsPass()));
-
-  // Require the GlobalsAA analysis for the module so we can query it within
-  // MainFPM.
-  MPM.addPass(RequireAnalysisPass<GlobalsAA, Module>());
-  // Invalidate AAManager so it can be recreated and pick up the newly available
-  // GlobalsAA.
-  MPM.addPass(
-      createModuleToFunctionPassAdaptor(InvalidateAnalysisPass<AAManager>()));
-
-  FunctionPassManager MainFPM;
-  MainFPM.addPass(createFunctionToLoopPassAdaptor(
-      LICMPass(PTO.LicmMssaOptCap, PTO.LicmMssaNoAccForPromotionCap),
-      /*USeMemorySSA=*/true, /*UseBlockFrequencyInfo=*/true));
-
-  if (RunNewGVN)
-    MainFPM.addPass(NewGVNPass());
-  else
-    MainFPM.addPass(GVN());
-
-  // Remove dead memcpy()'s.
-  MainFPM.addPass(MemCpyOptPass());
-
-  // Nuke dead stores.
-  MainFPM.addPass(DSEPass());
-  MainFPM.addPass(MergedLoadStoreMotionPass());
-
-  // More loops are countable; try to optimize them.
-  if (EnableLoopFlatten && Level.getSpeedupLevel() > 1)
-    MainFPM.addPass(createFunctionToLoopPassAdaptor(LoopFlattenPass()));
-
-  if (EnableConstraintElimination)
-    MainFPM.addPass(ConstraintEliminationPass());
-
-  LoopPassManager LPM;
-  LPM.addPass(IndVarSimplifyPass());
-  LPM.addPass(LoopDeletionPass());
-  // FIXME: Add loop interchange.
-
-  // Unroll small loops and perform peeling.
-  LPM.addPass(LoopFullUnrollPass(Level.getSpeedupLevel(),
-                                 /* OnlyWhenForced= */ !PTO.LoopUnrolling,
-                                 PTO.ForgetAllSCEVInLoopUnroll));
-  // The loop passes in LPM (LoopFullUnrollPass) do not preserve MemorySSA.
-  // *All* loop passes must preserve it, in order to be able to use it.
-  MainFPM.addPass(createFunctionToLoopPassAdaptor(
-      std::move(LPM), /*UseMemorySSA=*/false, /*UseBlockFrequencyInfo=*/true));
-
-  MainFPM.addPass(LoopDistributePass());
-
-  addVectorPasses(Level, MainFPM, /* IsFullLTO */ true);
-
-  invokePeepholeEPCallbacks(MainFPM, Level);
-  MainFPM.addPass(JumpThreadingPass(/*InsertFreezeWhenUnfoldingSelect*/ true));
-  MPM.addPass(createModuleToFunctionPassAdaptor(std::move(MainFPM)));
-
-  // Lower type metadata and the type.test intrinsic. This pass supports
-  // clang's control flow integrity mechanisms (-fsanitize=cfi*) and needs
-  // to be run at link time if CFI is enabled. This pass does nothing if
-  // CFI is disabled.
-  MPM.addPass(LowerTypeTestsPass(ExportSummary, nullptr));
-  // Run a second time to clean up any type tests left behind by WPD for use
-  // in ICP (which is performed earlier than this in the regular LTO pipeline).
-  MPM.addPass(LowerTypeTestsPass(nullptr, nullptr, true));
-
-  // Enable splitting late in the FullLTO post-link pipeline. This is done in
-  // the same stage in the old pass manager (\ref addLateLTOOptimizationPasses).
-  if (EnableHotColdSplit)
-    MPM.addPass(HotColdSplittingPass());
-
-  // Add late LTO optimization passes.
-  // Delete basic blocks, which optimization passes may have killed.
-  MPM.addPass(createModuleToFunctionPassAdaptor(
-      SimplifyCFGPass(SimplifyCFGOptions().hoistCommonInsts(true))));
-
-  // Drop bodies of available eternally objects to improve GlobalDCE.
-  MPM.addPass(EliminateAvailableExternallyPass());
-
-  // Now that we have optimized the program, discard unreachable functions.
-  MPM.addPass(GlobalDCEPass());
-
-  if (PTO.MergeFunctions)
-    MPM.addPass(MergeFunctionsPass());
-
-  // Emit annotation remarks.
-  addAnnotationRemarksPass(MPM);
-
-  return MPM;
-}
-
-ModulePassManager PassBuilder::buildO0DefaultPipeline(OptimizationLevel Level,
-                                                      bool LTOPreLink) {
-  assert(Level == OptimizationLevel::O0 &&
-         "buildO0DefaultPipeline should only be used with O0");
-
-  ModulePassManager MPM;
-
-  if (PGOOpt && (PGOOpt->Action == PGOOptions::IRInstr ||
-                 PGOOpt->Action == PGOOptions::IRUse))
-    addPGOInstrPassesForO0(
-        MPM,
-        /* RunProfileGen */ (PGOOpt->Action == PGOOptions::IRInstr),
-        /* IsCS */ false, PGOOpt->ProfileFile, PGOOpt->ProfileRemappingFile);
-
-  for (auto &C : PipelineStartEPCallbacks)
-    C(MPM, Level);
-
-  if (PGOOpt && PGOOpt->DebugInfoForProfiling)
-    MPM.addPass(createModuleToFunctionPassAdaptor(AddDiscriminatorsPass()));
-
-  for (auto &C : PipelineEarlySimplificationEPCallbacks)
-    C(MPM, Level);
-
-  // Build a minimal pipeline based on the semantics required by LLVM,
-  // which is just that always inlining occurs. Further, disable generating
-  // lifetime intrinsics to avoid enabling further optimizations during
-  // code generation.
-  MPM.addPass(AlwaysInlinerPass(
-      /*InsertLifetimeIntrinsics=*/false));
-
-  if (PTO.MergeFunctions)
-    MPM.addPass(MergeFunctionsPass());
-
-  if (EnableMatrix)
-    MPM.addPass(
-        createModuleToFunctionPassAdaptor(LowerMatrixIntrinsicsPass(true)));
-
-  if (!CGSCCOptimizerLateEPCallbacks.empty()) {
-    CGSCCPassManager CGPM;
-    for (auto &C : CGSCCOptimizerLateEPCallbacks)
-      C(CGPM, Level);
-    if (!CGPM.isEmpty())
-      MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(std::move(CGPM)));
-  }
-  if (!LateLoopOptimizationsEPCallbacks.empty()) {
-    LoopPassManager LPM;
-    for (auto &C : LateLoopOptimizationsEPCallbacks)
-      C(LPM, Level);
-    if (!LPM.isEmpty()) {
-      MPM.addPass(createModuleToFunctionPassAdaptor(
-          createFunctionToLoopPassAdaptor(std::move(LPM))));
-    }
-  }
-  if (!LoopOptimizerEndEPCallbacks.empty()) {
-    LoopPassManager LPM;
-    for (auto &C : LoopOptimizerEndEPCallbacks)
-      C(LPM, Level);
-    if (!LPM.isEmpty()) {
-      MPM.addPass(createModuleToFunctionPassAdaptor(
-          createFunctionToLoopPassAdaptor(std::move(LPM))));
-    }
-  }
-  if (!ScalarOptimizerLateEPCallbacks.empty()) {
-    FunctionPassManager FPM;
-    for (auto &C : ScalarOptimizerLateEPCallbacks)
-      C(FPM, Level);
-    if (!FPM.isEmpty())
-      MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
-  }
-  if (!VectorizerStartEPCallbacks.empty()) {
-    FunctionPassManager FPM;
-    for (auto &C : VectorizerStartEPCallbacks)
-      C(FPM, Level);
-    if (!FPM.isEmpty())
-      MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
-  }
-
-  MPM.addPass(createModuleToFunctionPassAdaptor(CoroEarlyPass()));
-  CGSCCPassManager CGPM;
-  CGPM.addPass(CoroSplitPass());
-  MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(std::move(CGPM)));
-  MPM.addPass(createModuleToFunctionPassAdaptor(CoroCleanupPass()));
-
-  for (auto &C : OptimizerLastEPCallbacks)
-    C(MPM, Level);
-
-  if (LTOPreLink)
-    addRequiredLTOPreLinkPasses(MPM);
-
-  return MPM;
-}
-
-AAManager PassBuilder::buildDefaultAAPipeline() {
-  AAManager AA;
-
-  // The order in which these are registered determines their priority when
-  // being queried.
-
-  // First we register the basic alias analysis that provides the majority of
-  // per-function local AA logic. This is a stateless, on-demand local set of
-  // AA techniques.
-  AA.registerFunctionAnalysis<BasicAA>();
-
-  // Next we query fast, specialized alias analyses that wrap IR-embedded
-  // information about aliasing.
-  AA.registerFunctionAnalysis<ScopedNoAliasAA>();
-  AA.registerFunctionAnalysis<TypeBasedAA>();
-
-  // Add support for querying global aliasing information when available.
-  // Because the `AAManager` is a function analysis and `GlobalsAA` is a module
-  // analysis, all that the `AAManager` can do is query for any *cached*
-  // results from `GlobalsAA` through a readonly proxy.
-  AA.registerModuleAnalysis<GlobalsAA>();
-
-  // Add target-specific alias analyses.
-  if (TM)
-    TM->registerDefaultAliasAnalyses(AA);
-
-  return AA;
-}
-
 static Optional<int> parseRepeatPassName(StringRef Name) {
   if (!Name.consume_front("repeat<") || !Name.consume_back(">"))
     return None;
   int Count;
   if (Name.getAsInteger(0, Count) || Count <= 0)
     return None;
   return Count;
 }

llvm/lib/Passes/PassBuilderPipelines.cpp

-//===- Parsing, selection, and construction of pass pipelines -------------===//
+//===- Construction of pass pipelines -------------------------------------===//
 //
 // 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 provides the implementation of the PassBuilder based on our
 /// static pass registry as well as related functionality. It also provides
 /// helpers to aid in analyzing, debugging, and testing passes and pass
 /// pipelines.
 ///
 //===----------------------------------------------------------------------===//
 
-#include "llvm/Passes/PassBuilder.h"
-#include "llvm/ADT/StringSwitch.h"
-#include "llvm/Analysis/AliasAnalysisEvaluator.h"
-#include "llvm/Analysis/AliasSetTracker.h"
-#include "llvm/Analysis/AssumptionCache.h"
+#include "llvm/Analysis/AliasAnalysis.h"
 #include "llvm/Analysis/BasicAliasAnalysis.h"
-#include "llvm/Analysis/BlockFrequencyInfo.h"
-#include "llvm/Analysis/BranchProbabilityInfo.h"
-#include "llvm/Analysis/CFGPrinter.h"
-#include "llvm/Analysis/CFLAndersAliasAnalysis.h"
-#include "llvm/Analysis/CFLSteensAliasAnalysis.h"
 #include "llvm/Analysis/CGSCCPassManager.h"
-#include "llvm/Analysis/CallGraph.h"
-#include "llvm/Analysis/CostModel.h"
-#include "llvm/Analysis/DDG.h"
-#include "llvm/Analysis/DDGPrinter.h"
-#include "llvm/Analysis/Delinearization.h"
-#include "llvm/Analysis/DemandedBits.h"
-#include "llvm/Analysis/DependenceAnalysis.h"
-#include "llvm/Analysis/DivergenceAnalysis.h"
-#include "llvm/Analysis/DominanceFrontier.h"
-#include "llvm/Analysis/FunctionPropertiesAnalysis.h"
 #include "llvm/Analysis/GlobalsModRef.h"
-#include "llvm/Analysis/IRSimilarityIdentifier.h"
-#include "llvm/Analysis/IVUsers.h"
 #include "llvm/Analysis/InlineAdvisor.h"
-#include "llvm/Analysis/InlineSizeEstimatorAnalysis.h"
-#include "llvm/Analysis/InstCount.h"
-#include "llvm/Analysis/LazyCallGraph.h"
-#include "llvm/Analysis/LazyValueInfo.h"
-#include "llvm/Analysis/Lint.h"
-#include "llvm/Analysis/LoopAccessAnalysis.h"
-#include "llvm/Analysis/LoopCacheAnalysis.h"
-#include "llvm/Analysis/LoopInfo.h"
-#include "llvm/Analysis/LoopNestAnalysis.h"
-#include "llvm/Analysis/MemDerefPrinter.h"
-#include "llvm/Analysis/MemoryDependenceAnalysis.h"
-#include "llvm/Analysis/MemorySSA.h"
-#include "llvm/Analysis/ModuleDebugInfoPrinter.h"
-#include "llvm/Analysis/ModuleSummaryAnalysis.h"
-#include "llvm/Analysis/MustExecute.h"
-#include "llvm/Analysis/ObjCARCAliasAnalysis.h"
 #include "llvm/Analysis/OptimizationRemarkEmitter.h"
-#include "llvm/Analysis/PhiValues.h"
-#include "llvm/Analysis/PostDominators.h"
 #include "llvm/Analysis/ProfileSummaryInfo.h"
-#include "llvm/Analysis/RegionInfo.h"
-#include "llvm/Analysis/ScalarEvolution.h"
-#include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
 #include "llvm/Analysis/ScopedNoAliasAA.h"
-#include "llvm/Analysis/StackLifetime.h"
-#include "llvm/Analysis/StackSafetyAnalysis.h"
-#include "llvm/Analysis/TargetLibraryInfo.h"
-#include "llvm/Analysis/TargetTransformInfo.h"
 #include "llvm/Analysis/TypeBasedAliasAnalysis.h"
-#include "llvm/IR/Dominators.h"
-#include "llvm/IR/IRPrintingPasses.h"
 #include "llvm/IR/PassManager.h"
-#include "llvm/IR/PrintPasses.h"
-#include "llvm/IR/SafepointIRVerifier.h"
-#include "llvm/IR/Verifier.h"
+#include "llvm/Passes/OptimizationLevel.h"
+#include "llvm/Passes/PassBuilder.h"
 #include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/FormatVariadic.h"
-#include "llvm/Support/Regex.h"
+#include "llvm/Support/PGOOptions.h"
 #include "llvm/Target/TargetMachine.h"
 #include "llvm/Transforms/AggressiveInstCombine/AggressiveInstCombine.h"
 #include "llvm/Transforms/Coroutines/CoroCleanup.h"
 #include "llvm/Transforms/Coroutines/CoroEarly.h"
 #include "llvm/Transforms/Coroutines/CoroElide.h"
 #include "llvm/Transforms/Coroutines/CoroSplit.h"
 #include "llvm/Transforms/IPO/AlwaysInliner.h"
 #include "llvm/Transforms/IPO/Annotation2Metadata.h"
 #include "llvm/Transforms/IPO/ArgumentPromotion.h"
 #include "llvm/Transforms/IPO/Attributor.h"
-#include "llvm/Transforms/IPO/BlockExtractor.h"
 #include "llvm/Transforms/IPO/CalledValuePropagation.h"
 #include "llvm/Transforms/IPO/ConstantMerge.h"
 #include "llvm/Transforms/IPO/CrossDSOCFI.h"
 #include "llvm/Transforms/IPO/DeadArgumentElimination.h"
 #include "llvm/Transforms/IPO/ElimAvailExtern.h"
 #include "llvm/Transforms/IPO/ForceFunctionAttrs.h"
 #include "llvm/Transforms/IPO/FunctionAttrs.h"
-#include "llvm/Transforms/IPO/FunctionImport.h"
 #include "llvm/Transforms/IPO/GlobalDCE.h"
 #include "llvm/Transforms/IPO/GlobalOpt.h"
 #include "llvm/Transforms/IPO/GlobalSplit.h"
 #include "llvm/Transforms/IPO/HotColdSplitting.h"
 #include "llvm/Transforms/IPO/IROutliner.h"
 #include "llvm/Transforms/IPO/InferFunctionAttrs.h"
 #include "llvm/Transforms/IPO/Inliner.h"
-#include "llvm/Transforms/IPO/Internalize.h"
-#include "llvm/Transforms/IPO/LoopExtractor.h"
 #include "llvm/Transforms/IPO/LowerTypeTests.h"
 #include "llvm/Transforms/IPO/MergeFunctions.h"
 #include "llvm/Transforms/IPO/OpenMPOpt.h"
 #include "llvm/Transforms/IPO/PartialInlining.h"
 #include "llvm/Transforms/IPO/SCCP.h"
 #include "llvm/Transforms/IPO/SampleProfile.h"
 #include "llvm/Transforms/IPO/SampleProfileProbe.h"
-#include "llvm/Transforms/IPO/StripDeadPrototypes.h"
-#include "llvm/Transforms/IPO/StripSymbols.h"
 #include "llvm/Transforms/IPO/SyntheticCountsPropagation.h"
 #include "llvm/Transforms/IPO/WholeProgramDevirt.h"
 #include "llvm/Transforms/InstCombine/InstCombine.h"
-#include "llvm/Transforms/Instrumentation.h"
-#include "llvm/Transforms/Instrumentation/AddressSanitizer.h"
-#include "llvm/Transforms/Instrumentation/BoundsChecking.h"
 #include "llvm/Transforms/Instrumentation/CGProfile.h"
 #include "llvm/Transforms/Instrumentation/ControlHeightReduction.h"
-#include "llvm/Transforms/Instrumentation/DataFlowSanitizer.h"
-#include "llvm/Transforms/Instrumentation/GCOVProfiler.h"
-#include "llvm/Transforms/Instrumentation/HWAddressSanitizer.h"
 #include "llvm/Transforms/Instrumentation/InstrOrderFile.h"
 #include "llvm/Transforms/Instrumentation/InstrProfiling.h"
 #include "llvm/Transforms/Instrumentation/MemProfiler.h"
-#include "llvm/Transforms/Instrumentation/MemorySanitizer.h"
 #include "llvm/Transforms/Instrumentation/PGOInstrumentation.h"
-#include "llvm/Transforms/Instrumentation/PoisonChecking.h"
-#include "llvm/Transforms/Instrumentation/SanitizerCoverage.h"
-#include "llvm/Transforms/Instrumentation/ThreadSanitizer.h"
-#include "llvm/Transforms/ObjCARC.h"
 #include "llvm/Transforms/Scalar/ADCE.h"
 #include "llvm/Transforms/Scalar/AlignmentFromAssumptions.h"
 #include "llvm/Transforms/Scalar/AnnotationRemarks.h"
 #include "llvm/Transforms/Scalar/BDCE.h"
 #include "llvm/Transforms/Scalar/CallSiteSplitting.h"
-#include "llvm/Transforms/Scalar/ConstantHoisting.h"
 #include "llvm/Transforms/Scalar/ConstraintElimination.h"
 #include "llvm/Transforms/Scalar/CorrelatedValuePropagation.h"
-#include "llvm/Transforms/Scalar/DCE.h"
 #include "llvm/Transforms/Scalar/DFAJumpThreading.h"
 #include "llvm/Transforms/Scalar/DeadStoreElimination.h"
 #include "llvm/Transforms/Scalar/DivRemPairs.h"
 #include "llvm/Transforms/Scalar/EarlyCSE.h"
 #include "llvm/Transforms/Scalar/Float2Int.h"
 #include "llvm/Transforms/Scalar/GVN.h"
-#include "llvm/Transforms/Scalar/GuardWidening.h"
-#include "llvm/Transforms/Scalar/IVUsersPrinter.h"
 #include "llvm/Transforms/Scalar/IndVarSimplify.h"
-#include "llvm/Transforms/Scalar/InductiveRangeCheckElimination.h"
-#include "llvm/Transforms/Scalar/InferAddressSpaces.h"
 #include "llvm/Transforms/Scalar/InstSimplifyPass.h"
 #include "llvm/Transforms/Scalar/JumpThreading.h"
 #include "llvm/Transforms/Scalar/LICM.h"
-#include "llvm/Transforms/Scalar/LoopAccessAnalysisPrinter.h"
-#include "llvm/Transforms/Scalar/LoopBoundSplit.h"
-#include "llvm/Transforms/Scalar/LoopDataPrefetch.h"
 #include "llvm/Transforms/Scalar/LoopDeletion.h"
 #include "llvm/Transforms/Scalar/LoopDistribute.h"
 #include "llvm/Transforms/Scalar/LoopFlatten.h"
-#include "llvm/Transforms/Scalar/LoopFuse.h"
 #include "llvm/Transforms/Scalar/LoopIdiomRecognize.h"
 #include "llvm/Transforms/Scalar/LoopInstSimplify.h"
 #include "llvm/Transforms/Scalar/LoopInterchange.h"
 #include "llvm/Transforms/Scalar/LoopLoadElimination.h"
 #include "llvm/Transforms/Scalar/LoopPassManager.h"
-#include "llvm/Transforms/Scalar/LoopPredication.h"
-#include "llvm/Transforms/Scalar/LoopReroll.h"
 #include "llvm/Transforms/Scalar/LoopRotation.h"
 #include "llvm/Transforms/Scalar/LoopSimplifyCFG.h"
 #include "llvm/Transforms/Scalar/LoopSink.h"
-#include "llvm/Transforms/Scalar/LoopStrengthReduce.h"
 #include "llvm/Transforms/Scalar/LoopUnrollAndJamPass.h"
 #include "llvm/Transforms/Scalar/LoopUnrollPass.h"
-#include "llvm/Transforms/Scalar/LoopVersioningLICM.h"
-#include "llvm/Transforms/Scalar/LowerAtomic.h"
 #include "llvm/Transforms/Scalar/LowerConstantIntrinsics.h"
 #include "llvm/Transforms/Scalar/LowerExpectIntrinsic.h"
-#include "llvm/Transforms/Scalar/LowerGuardIntrinsic.h"
 #include "llvm/Transforms/Scalar/LowerMatrixIntrinsics.h"
-#include "llvm/Transforms/Scalar/LowerWidenableCondition.h"
-#include "llvm/Transforms/Scalar/MakeGuardsExplicit.h"
 #include "llvm/Transforms/Scalar/MemCpyOptimizer.h"
-#include "llvm/Transforms/Scalar/MergeICmps.h"
 #include "llvm/Transforms/Scalar/MergedLoadStoreMotion.h"
-#include "llvm/Transforms/Scalar/NaryReassociate.h"
 #include "llvm/Transforms/Scalar/NewGVN.h"
-#include "llvm/Transforms/Scalar/PartiallyInlineLibCalls.h"
 #include "llvm/Transforms/Scalar/Reassociate.h"
-#include "llvm/Transforms/Scalar/Reg2Mem.h"
-#include "llvm/Transforms/Scalar/RewriteStatepointsForGC.h"
 #include "llvm/Transforms/Scalar/SCCP.h"
 #include "llvm/Transforms/Scalar/SROA.h"
-#include "llvm/Transforms/Scalar/ScalarizeMaskedMemIntrin.h"
-#include "llvm/Transforms/Scalar/Scalarizer.h"
-#include "llvm/Transforms/Scalar/SeparateConstOffsetFromGEP.h"
 #include "llvm/Transforms/Scalar/SimpleLoopUnswitch.h"
 #include "llvm/Transforms/Scalar/SimplifyCFG.h"
-#include "llvm/Transforms/Scalar/Sink.h"
 #include "llvm/Transforms/Scalar/SpeculativeExecution.h"
-#include "llvm/Transforms/Scalar/StraightLineStrengthReduce.h"
-#include "llvm/Transforms/Scalar/StructurizeCFG.h"
 #include "llvm/Transforms/Scalar/TailRecursionElimination.h"
 #include "llvm/Transforms/Scalar/WarnMissedTransforms.h"
 #include "llvm/Transforms/Utils/AddDiscriminators.h"
 #include "llvm/Transforms/Utils/AssumeBundleBuilder.h"
-#include "llvm/Transforms/Utils/BreakCriticalEdges.h"
 #include "llvm/Transforms/Utils/CanonicalizeAliases.h"
-#include "llvm/Transforms/Utils/CanonicalizeFreezeInLoops.h"
-#include "llvm/Transforms/Utils/EntryExitInstrumenter.h"
-#include "llvm/Transforms/Utils/FixIrreducible.h"
-#include "llvm/Transforms/Utils/HelloWorld.h"
 #include "llvm/Transforms/Utils/InjectTLIMappings.h"
-#include "llvm/Transforms/Utils/InstructionNamer.h"
-#include "llvm/Transforms/Utils/LCSSA.h"
 #include "llvm/Transforms/Utils/LibCallsShrinkWrap.h"
-#include "llvm/Transforms/Utils/LoopSimplify.h"
-#include "llvm/Transforms/Utils/LoopVersioning.h"
-#include "llvm/Transforms/Utils/LowerInvoke.h"
-#include "llvm/Transforms/Utils/LowerSwitch.h"
 #include "llvm/Transforms/Utils/Mem2Reg.h"
-#include "llvm/Transforms/Utils/MetaRenamer.h"
 #include "llvm/Transforms/Utils/NameAnonGlobals.h"
 #include "llvm/Transforms/Utils/RelLookupTableConverter.h"
-#include "llvm/Transforms/Utils/StripGCRelocates.h"
-#include "llvm/Transforms/Utils/StripNonLineTableDebugInfo.h"
-#include "llvm/Transforms/Utils/SymbolRewriter.h"
-#include "llvm/Transforms/Utils/UnifyFunctionExitNodes.h"
-#include "llvm/Transforms/Utils/UnifyLoopExits.h"
-#include "llvm/Transforms/Vectorize/LoadStoreVectorizer.h"
+#include "llvm/Transforms/Utils/SimplifyCFGOptions.h"
 #include "llvm/Transforms/Vectorize/LoopVectorize.h"
 #include "llvm/Transforms/Vectorize/SLPVectorizer.h"
 #include "llvm/Transforms/Vectorize/VectorCombine.h"
 
 using namespace llvm;
 
 static cl::opt<InliningAdvisorMode> UseInlineAdvisor(
     "enable-ml-inliner", cl::init(InliningAdvisorMode::Default), cl::Hidden,
     cl::desc("Enable ML policy for inliner. Currently trained for -Oz only"),
     cl::values(clEnumValN(InliningAdvisorMode::Default, "default",
                           "Heuristics-based inliner version."),
                clEnumValN(InliningAdvisorMode::Development, "development",
                           "Use development mode (runtime-loadable model)."),
                clEnumValN(InliningAdvisorMode::Release, "release",
                           "Use release mode (AOT-compiled model).")));
 
 static cl::opt<bool> EnableSyntheticCounts(
     "enable-npm-synthetic-counts", cl::init(false), cl::Hidden, cl::ZeroOrMore,
     cl::desc("Run synthetic function entry count generation "
              "pass"));
 
-static const Regex DefaultAliasRegex(
-    "^(default|thinlto-pre-link|thinlto|lto-pre-link|lto)<(O[0123sz])>$");
-
 /// Flag to enable inline deferral during PGO.
 static cl::opt<bool>
     EnablePGOInlineDeferral("enable-npm-pgo-inline-deferral", cl::init(true),
                             cl::Hidden,
                             cl::desc("Enable inline deferral during PGO"));
 
 static cl::opt<bool> EnableMemProfiler("enable-mem-prof", cl::init(false),
                                        cl::Hidden, cl::ZeroOrMore,
PipelineTuningOptions::PipelineTuningOptions() {
   ForgetAllSCEVInLoopUnroll = ForgetSCEVInLoopUnroll;
   LicmMssaOptCap = SetLicmMssaOptCap;
   LicmMssaNoAccForPromotionCap = SetLicmMssaNoAccForPromotionCap;
   CallGraphProfile = true;
   MergeFunctions = false;
 }
 
 namespace llvm {
-cl::opt<bool> PrintPipelinePasses(
-    "print-pipeline-passes",
-    cl::desc("Print a '-passes' compatible string describing the pipeline "
-             "(best-effort only)."));
 
 extern cl::opt<unsigned> MaxDevirtIterations;
 extern cl::opt<bool> EnableConstraintElimination;
 extern cl::opt<bool> EnableFunctionSpecialization;
 extern cl::opt<bool> EnableGVNHoist;
 extern cl::opt<bool> EnableGVNSink;
 extern cl::opt<bool> EnableHotColdSplit;
 extern cl::opt<bool> EnableIROutliner;

 extern cl::opt<bool> EnableKnowledgeRetention;
 
 extern cl::opt<bool> EnableMatrix;
 
 extern cl::opt<bool> DisablePreInliner;
 extern cl::opt<int> PreInlineThreshold;
 } // namespace llvm
 
-const OptimizationLevel OptimizationLevel::O0 = {
-    /*SpeedLevel*/ 0,
-    /*SizeLevel*/ 0};
-const OptimizationLevel OptimizationLevel::O1 = {
-    /*SpeedLevel*/ 1,
-    /*SizeLevel*/ 0};
-const OptimizationLevel OptimizationLevel::O2 = {
-    /*SpeedLevel*/ 2,
-    /*SizeLevel*/ 0};
-const OptimizationLevel OptimizationLevel::O3 = {
-    /*SpeedLevel*/ 3,
-    /*SizeLevel*/ 0};
-const OptimizationLevel OptimizationLevel::Os = {
-    /*SpeedLevel*/ 2,
-    /*SizeLevel*/ 1};
-const OptimizationLevel OptimizationLevel::Oz = {
-    /*SpeedLevel*/ 2,
-    /*SizeLevel*/ 2};
-
-namespace {
-
-// The following passes/analyses have custom names, otherwise their name will
-// include `(anonymous namespace)`. These are special since they are only for
-// testing purposes and don't live in a header file.
-
-/// No-op module pass which does nothing.
-struct NoOpModulePass : PassInfoMixin<NoOpModulePass> {
-  PreservedAnalyses run(Module &M, ModuleAnalysisManager &) {
-    return PreservedAnalyses::all();
-  }
-
-  static StringRef name() { return "NoOpModulePass"; }
-};
-
-/// No-op module analysis.
-class NoOpModuleAnalysis : public AnalysisInfoMixin<NoOpModuleAnalysis> {
-  friend AnalysisInfoMixin<NoOpModuleAnalysis>;
-  static AnalysisKey Key;
-
-public:
-  struct Result {};
-  Result run(Module &, ModuleAnalysisManager &) { return Result(); }
-  static StringRef name() { return "NoOpModuleAnalysis"; }
-};
-
-/// No-op CGSCC pass which does nothing.
-struct NoOpCGSCCPass : PassInfoMixin<NoOpCGSCCPass> {
-  PreservedAnalyses run(LazyCallGraph::SCC &C, CGSCCAnalysisManager &,
-                        LazyCallGraph &, CGSCCUpdateResult &UR) {
-    return PreservedAnalyses::all();
-  }
-  static StringRef name() { return "NoOpCGSCCPass"; }
-};
-
-/// No-op CGSCC analysis.
-class NoOpCGSCCAnalysis : public AnalysisInfoMixin<NoOpCGSCCAnalysis> {
-  friend AnalysisInfoMixin<NoOpCGSCCAnalysis>;
-  static AnalysisKey Key;
-
-public:
-  struct Result {};
-  Result run(LazyCallGraph::SCC &, CGSCCAnalysisManager &, LazyCallGraph &G) {
-    return Result();
-  }
-  static StringRef name() { return "NoOpCGSCCAnalysis"; }
-};
-
-/// No-op function pass which does nothing.
-struct NoOpFunctionPass : PassInfoMixin<NoOpFunctionPass> {
-  PreservedAnalyses run(Function &F, FunctionAnalysisManager &) {
-    return PreservedAnalyses::all();
-  }
-  static StringRef name() { return "NoOpFunctionPass"; }
-};
-
-/// No-op function analysis.
-class NoOpFunctionAnalysis : public AnalysisInfoMixin<NoOpFunctionAnalysis> {
-  friend AnalysisInfoMixin<NoOpFunctionAnalysis>;
-  static AnalysisKey Key;
-
-public:
-  struct Result {};
-  Result run(Function &, FunctionAnalysisManager &) { return Result(); }
-  static StringRef name() { return "NoOpFunctionAnalysis"; }
-};
-
-/// No-op loop pass which does nothing.
-struct NoOpLoopPass : PassInfoMixin<NoOpLoopPass> {
-  PreservedAnalyses run(Loop &L, LoopAnalysisManager &,
-                        LoopStandardAnalysisResults &, LPMUpdater &) {
-    return PreservedAnalyses::all();
-  }
-  static StringRef name() { return "NoOpLoopPass"; }
-};
-
-/// No-op loop analysis.
-class NoOpLoopAnalysis : public AnalysisInfoMixin<NoOpLoopAnalysis> {
-  friend AnalysisInfoMixin<NoOpLoopAnalysis>;
-  static AnalysisKey Key;
-
-public:
-  struct Result {};
-  Result run(Loop &, LoopAnalysisManager &, LoopStandardAnalysisResults &) {
-    return Result();
-  }
-  static StringRef name() { return "NoOpLoopAnalysis"; }
-};
-
-AnalysisKey NoOpModuleAnalysis::Key;
-AnalysisKey NoOpCGSCCAnalysis::Key;
-AnalysisKey NoOpFunctionAnalysis::Key;
-AnalysisKey NoOpLoopAnalysis::Key;
-
-/// Whether or not we should populate a PassInstrumentationCallbacks's class to
-/// pass name map.
-///
-/// This is for optimization purposes so we don't populate it if we never use
-/// it. This should be updated if new pass instrumentation wants to use the map.
-/// We currently only use this for --print-before/after.
-bool shouldPopulateClassToPassNames() {
-  return PrintPipelinePasses || !printBeforePasses().empty() ||
-         !printAfterPasses().empty();
-}
-
-} // namespace
-
-PassBuilder::PassBuilder(TargetMachine *TM, PipelineTuningOptions PTO,
-                         Optional<PGOOptions> PGOOpt,
-                         PassInstrumentationCallbacks *PIC)
-    : TM(TM), PTO(PTO), PGOOpt(PGOOpt), PIC(PIC) {
-  if (TM)
-    TM->registerPassBuilderCallbacks(*this);
-  if (PIC && shouldPopulateClassToPassNames()) {
-#define MODULE_PASS(NAME, CREATE_PASS)                                         \
-  PIC->addClassToPassName(decltype(CREATE_PASS)::name(), NAME);
-#define MODULE_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)      \
-  PIC->addClassToPassName(CLASS, NAME);
-#define MODULE_ANALYSIS(NAME, CREATE_PASS)                                     \
-  PIC->addClassToPassName(decltype(CREATE_PASS)::name(), NAME);
-#define FUNCTION_PASS(NAME, CREATE_PASS)                                       \
-  PIC->addClassToPassName(decltype(CREATE_PASS)::name(), NAME);
-#define FUNCTION_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)    \
-  PIC->addClassToPassName(CLASS, NAME);
-#define FUNCTION_ANALYSIS(NAME, CREATE_PASS)                                   \
-  PIC->addClassToPassName(decltype(CREATE_PASS)::name(), NAME);
-#define LOOP_PASS(NAME, CREATE_PASS)                                           \
-  PIC->addClassToPassName(decltype(CREATE_PASS)::name(), NAME);
-#define LOOP_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)        \
-  PIC->addClassToPassName(CLASS, NAME);
-#define LOOP_ANALYSIS(NAME, CREATE_PASS)                                       \
-  PIC->addClassToPassName(decltype(CREATE_PASS)::name(), NAME);
-#define CGSCC_PASS(NAME, CREATE_PASS)                                          \
-  PIC->addClassToPassName(decltype(CREATE_PASS)::name(), NAME);
-#define CGSCC_ANALYSIS(NAME, CREATE_PASS)                                      \
-  PIC->addClassToPassName(decltype(CREATE_PASS)::name(), NAME);
-#include "PassRegistry.def"
-  }
-}
-
 void PassBuilder::invokePeepholeEPCallbacks(FunctionPassManager &FPM,
                                             OptimizationLevel Level) {
   for (auto &C : PeepholeEPCallbacks)
     C(FPM, Level);
 }
 
-void PassBuilder::registerModuleAnalyses(ModuleAnalysisManager &MAM) {
-#define MODULE_ANALYSIS(NAME, CREATE_PASS)                                     \
-  MAM.registerPass([&] { return CREATE_PASS; });
-#include "PassRegistry.def"
-
-  for (auto &C : ModuleAnalysisRegistrationCallbacks)
-    C(MAM);
-}
-
-void PassBuilder::registerCGSCCAnalyses(CGSCCAnalysisManager &CGAM) {
-#define CGSCC_ANALYSIS(NAME, CREATE_PASS)                                      \
-  CGAM.registerPass([&] { return CREATE_PASS; });
-#include "PassRegistry.def"
-
-  for (auto &C : CGSCCAnalysisRegistrationCallbacks)
-    C(CGAM);
-}
-
-void PassBuilder::registerFunctionAnalyses(FunctionAnalysisManager &FAM) {
-#define FUNCTION_ANALYSIS(NAME, CREATE_PASS)                                   \
-  FAM.registerPass([&] { return CREATE_PASS; });
-#include "PassRegistry.def"
-
-  for (auto &C : FunctionAnalysisRegistrationCallbacks)
-    C(FAM);
-}
-
-void PassBuilder::registerLoopAnalyses(LoopAnalysisManager &LAM) {
-#define LOOP_ANALYSIS(NAME, CREATE_PASS)                                       \
-  LAM.registerPass([&] { return CREATE_PASS; });
-#include "PassRegistry.def"
-
-  for (auto &C : LoopAnalysisRegistrationCallbacks)
-    C(LAM);
-}
-
 // Helper to add AnnotationRemarksPass.
 static void addAnnotationRemarksPass(ModulePassManager &MPM) {
   FunctionPassManager FPM;
   FPM.addPass(AnnotationRemarksPass());
   MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
 }
 
 // Helper to check if the current compilation phase is preparing for LTO
if (Level.getSpeedupLevel() > 1) {
     MPM.addPass(IPSCCPPass());
 
     // Attach metadata to indirect call sites indicating the set of functions
     // they may target at run-time. This should follow IPSCCP.
     MPM.addPass(CalledValuePropagationPass());
   }
 
   // Now deduce any function attributes based in the current code.
-  MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(
-              PostOrderFunctionAttrsPass()));
+  MPM.addPass(
+      createModuleToPostOrderCGSCCPassAdaptor(PostOrderFunctionAttrsPass()));
 
   // Do RPO function attribute inference across the module to forward-propagate
   // attributes where applicable.
   // FIXME: Is this really an optimization rather than a canonicalization?
   MPM.addPass(ReversePostOrderFunctionAttrsPass());
 
   // Use in-range annotations on GEP indices to split globals where beneficial.
   MPM.addPass(GlobalSplitPass());
AAManager PassBuilder::buildDefaultAAPipeline() {
   AA.registerModuleAnalysis<GlobalsAA>();
 
   // Add target-specific alias analyses.
   if (TM)
     TM->registerDefaultAliasAnalyses(AA);
 
   return AA;
 }
-
-static Optional<int> parseRepeatPassName(StringRef Name) {
-  if (!Name.consume_front("repeat<") || !Name.consume_back(">"))
-    return None;
-  int Count;
-  if (Name.getAsInteger(0, Count) || Count <= 0)
-    return None;
-  return Count;
-}
-
-static Optional<int> parseDevirtPassName(StringRef Name) {
-  if (!Name.consume_front("devirt<") || !Name.consume_back(">"))
-    return None;
-  int Count;
-  if (Name.getAsInteger(0, Count) || Count < 0)
-    return None;
-  return Count;
-}
-
-static bool checkParametrizedPassName(StringRef Name, StringRef PassName) {
-  if (!Name.consume_front(PassName))
-    return false;
-  // normal pass name w/o parameters == default parameters
-  if (Name.empty())
-    return true;
-  return Name.startswith("<") && Name.endswith(">");
-}
-
-namespace {
-
-/// This performs customized parsing of pass name with parameters.
-///
-/// We do not need parametrization of passes in textual pipeline very often,
-/// yet on a rare occasion ability to specify parameters right there can be
-/// useful.
-///
-/// \p Name - parameterized specification of a pass from a textual pipeline
-/// is a string in a form of :
-///      PassName '<' parameter-list '>'
-///
-/// Parameter list is being parsed by the parser callable argument, \p Parser,
-/// It takes a string-ref of parameters and returns either StringError or a
-/// parameter list in a form of a custom parameters type, all wrapped into
-/// Expected<> template class.
-///
-template <typename ParametersParseCallableT>
-auto parsePassParameters(ParametersParseCallableT &&Parser, StringRef Name,
-                         StringRef PassName) -> decltype(Parser(StringRef{})) {
-  using ParametersT = typename decltype(Parser(StringRef{}))::value_type;
-
-  StringRef Params = Name;
-  if (!Params.consume_front(PassName)) {
-    assert(false &&
-           "unable to strip pass name from parametrized pass specification");
-  }
-  if (!Params.empty() &&
-      (!Params.consume_front("<") || !Params.consume_back(">"))) {
-    assert(false && "invalid format for parametrized pass name");
-  }
-
-  Expected<ParametersT> Result = Parser(Params);
-  assert((Result || Result.template errorIsA<StringError>()) &&
-         "Pass parameter parser can only return StringErrors.");
-  return Result;
-}
-
-/// Parser of parameters for LoopUnroll pass.
-Expected<LoopUnrollOptions> parseLoopUnrollOptions(StringRef Params) {
-  LoopUnrollOptions UnrollOpts;
-  while (!Params.empty()) {
-    StringRef ParamName;
-    std::tie(ParamName, Params) = Params.split(';');
-    int OptLevel = StringSwitch<int>(ParamName)
-                       .Case("O0", 0)
-                       .Case("O1", 1)
-                       .Case("O2", 2)
-                       .Case("O3", 3)
-                       .Default(-1);
-    if (OptLevel >= 0) {
-      UnrollOpts.setOptLevel(OptLevel);
-      continue;
-    }
-    if (ParamName.consume_front("full-unroll-max=")) {
-      int Count;
-      if (ParamName.getAsInteger(0, Count))
-        return make_error<StringError>(
-            formatv("invalid LoopUnrollPass parameter '{0}' ", ParamName).str(),
-            inconvertibleErrorCode());
-      UnrollOpts.setFullUnrollMaxCount(Count);
-      continue;
-    }
-
-    bool Enable = !ParamName.consume_front("no-");
-    if (ParamName == "partial") {
-      UnrollOpts.setPartial(Enable);
-    } else if (ParamName == "peeling") {
-      UnrollOpts.setPeeling(Enable);
-    } else if (ParamName == "profile-peeling") {
-      UnrollOpts.setProfileBasedPeeling(Enable);
-    } else if (ParamName == "runtime") {
-      UnrollOpts.setRuntime(Enable);
-    } else if (ParamName == "upperbound") {
-      UnrollOpts.setUpperBound(Enable);
-    } else {
-      return make_error<StringError>(
-          formatv("invalid LoopUnrollPass parameter '{0}' ", ParamName).str(),
-          inconvertibleErrorCode());
-    }
-  }
-  return UnrollOpts;
-}
-
-Expected<bool> parseSinglePassOption(StringRef Params, StringRef OptionName,
-                                     StringRef PassName) {
-  bool Result = false;
-  while (!Params.empty()) {
-    StringRef ParamName;
-    std::tie(ParamName, Params) = Params.split(';');
-
-    if (ParamName == OptionName) {
-      Result = true;
-    } else {
-      return make_error<StringError>(
-          formatv("invalid {1} pass parameter '{0}' ", ParamName, PassName)
-              .str(),
-          inconvertibleErrorCode());
-    }
-  }
-  return Result;
-}
-
-Expected<bool> parseEarlyCSEPassOptions(StringRef Params) {
-  return parseSinglePassOption(Params, "memssa", "EarlyCSE");
-}
-
-Expected<bool> parseEntryExitInstrumenterPassOptions(StringRef Params) {
-  return parseSinglePassOption(Params, "post-inline", "EntryExitInstrumenter");
-}
-
-Expected<bool> parseLoopExtractorPassOptions(StringRef Params) {
-  return parseSinglePassOption(Params, "single", "LoopExtractor");
-}
-
-Expected<bool> parseLowerMatrixIntrinsicsPassOptions(StringRef Params) {
-  return parseSinglePassOption(Params, "minimal", "LowerMatrixIntrinsics");
-}
-
-Expected<AddressSanitizerOptions> parseASanPassOptions(StringRef Params) {
-  AddressSanitizerOptions Result;
-  while (!Params.empty()) {
-    StringRef ParamName;
-    std::tie(ParamName, Params) = Params.split(';');
-
-    if (ParamName == "kernel") {
-      Result.CompileKernel = true;
-    } else {
-      return make_error<StringError>(
-          formatv("invalid AddressSanitizer pass parameter '{0}' ", ParamName)
-              .str(),
-          inconvertibleErrorCode());
-    }
-  }
-  return Result;
-}
-
-Expected<HWAddressSanitizerOptions> parseHWASanPassOptions(StringRef Params) {
-  HWAddressSanitizerOptions Result;
-  while (!Params.empty()) {
-    StringRef ParamName;
-    std::tie(ParamName, Params) = Params.split(';');
-
-    if (ParamName == "recover") {
-      Result.Recover = true;
-    } else if (ParamName == "kernel") {
-      Result.CompileKernel = true;
-    } else {
-      return make_error<StringError>(
-          formatv("invalid HWAddressSanitizer pass parameter '{0}' ", ParamName)
-              .str(),
-          inconvertibleErrorCode());
-    }
-  }
-  return Result;
-}
-
-Expected<MemorySanitizerOptions> parseMSanPassOptions(StringRef Params) {
-  MemorySanitizerOptions Result;
-  while (!Params.empty()) {
-    StringRef ParamName;
-    std::tie(ParamName, Params) = Params.split(';');
-
-    if (ParamName == "recover") {
-      Result.Recover = true;
-    } else if (ParamName == "kernel") {
-      Result.Kernel = true;
-    } else if (ParamName.consume_front("track-origins=")) {
-      if (ParamName.getAsInteger(0, Result.TrackOrigins))
-        return make_error<StringError>(
-            formatv("invalid argument to MemorySanitizer pass track-origins "
-                    "parameter: '{0}' ",
-                    ParamName)
-                .str(),
-            inconvertibleErrorCode());
-    } else {
-      return make_error<StringError>(
-          formatv("invalid MemorySanitizer pass parameter '{0}' ", ParamName)
-              .str(),
-          inconvertibleErrorCode());
-    }
-  }
-  return Result;
-}
-
-/// Parser of parameters for SimplifyCFG pass.
-Expected<SimplifyCFGOptions> parseSimplifyCFGOptions(StringRef Params) {
-  SimplifyCFGOptions Result;
-  while (!Params.empty()) {
-    StringRef ParamName;
-    std::tie(ParamName, Params) = Params.split(';');
-
-    bool Enable = !ParamName.consume_front("no-");
-    if (ParamName == "forward-switch-cond") {
-      Result.forwardSwitchCondToPhi(Enable);
-    } else if (ParamName == "switch-to-lookup") {
-      Result.convertSwitchToLookupTable(Enable);
-    } else if (ParamName == "keep-loops") {
-      Result.needCanonicalLoops(Enable);
-    } else if (ParamName == "hoist-common-insts") {
-      Result.hoistCommonInsts(Enable);
-    } else if (ParamName == "sink-common-insts") {
-      Result.sinkCommonInsts(Enable);
-    } else if (Enable && ParamName.consume_front("bonus-inst-threshold=")) {
-      APInt BonusInstThreshold;
-      if (ParamName.getAsInteger(0, BonusInstThreshold))
-        return make_error<StringError>(
-            formatv("invalid argument to SimplifyCFG pass bonus-threshold "
-                    "parameter: '{0}' ",
-                    ParamName).str(),
-            inconvertibleErrorCode());
-      Result.bonusInstThreshold(BonusInstThreshold.getSExtValue());
-    } else {
-      return make_error<StringError>(
-          formatv("invalid SimplifyCFG pass parameter '{0}' ", ParamName).str(),
-          inconvertibleErrorCode());
-    }
-  }
-  return Result;
-}
-
-/// Parser of parameters for LoopVectorize pass.
-Expected<LoopVectorizeOptions> parseLoopVectorizeOptions(StringRef Params) {
-  LoopVectorizeOptions Opts;
-  while (!Params.empty()) {
-    StringRef ParamName;
-    std::tie(ParamName, Params) = Params.split(';');
-
-    bool Enable = !ParamName.consume_front("no-");
-    if (ParamName == "interleave-forced-only") {
-      Opts.setInterleaveOnlyWhenForced(Enable);
-    } else if (ParamName == "vectorize-forced-only") {
-      Opts.setVectorizeOnlyWhenForced(Enable);
-    } else {
-      return make_error<StringError>(
-          formatv("invalid LoopVectorize parameter '{0}' ", ParamName).str(),
-          inconvertibleErrorCode());
-    }
-  }
-  return Opts;
-}
-
-Expected<std::pair<bool, bool>> parseLoopUnswitchOptions(StringRef Params) {
-  std::pair<bool, bool> Result = {false, true};
-  while (!Params.empty()) {
-    StringRef ParamName;
-    std::tie(ParamName, Params) = Params.split(';');
-
-    bool Enable = !ParamName.consume_front("no-");
-    if (ParamName == "nontrivial") {
-      Result.first = Enable;
-    } else if (ParamName == "trivial") {
-      Result.second = Enable;
-    } else {
-      return make_error<StringError>(
-          formatv("invalid LoopUnswitch pass parameter '{0}' ", ParamName)
-              .str(),
-          inconvertibleErrorCode());
-    }
-  }
-  return Result;
-}
-
-Expected<bool> parseMergedLoadStoreMotionOptions(StringRef Params) {
-  bool Result = false;
-  while (!Params.empty()) {
-    StringRef ParamName;
-    std::tie(ParamName, Params) = Params.split(';');
-
-    bool Enable = !ParamName.consume_front("no-");
-    if (ParamName == "split-footer-bb") {
-      Result = Enable;
-    } else {
-      return make_error<StringError>(
-          formatv("invalid MergedLoadStoreMotion pass parameter '{0}' ",
-                  ParamName)
-              .str(),
-          inconvertibleErrorCode());
-    }
-  }
-  return Result;
-}
-
-Expected<GVNOptions> parseGVNOptions(StringRef Params) {
-  GVNOptions Result;
-  while (!Params.empty()) {
-    StringRef ParamName;
-    std::tie(ParamName, Params) = Params.split(';');
-
-    bool Enable = !ParamName.consume_front("no-");
-    if (ParamName == "pre") {
-      Result.setPRE(Enable);
-    } else if (ParamName == "load-pre") {
-      Result.setLoadPRE(Enable);
-    } else if (ParamName == "split-backedge-load-pre") {
-      Result.setLoadPRESplitBackedge(Enable);
-    } else if (ParamName == "memdep") {
-      Result.setMemDep(Enable);
-    } else {
-      return make_error<StringError>(
-          formatv("invalid GVN pass parameter '{0}' ", ParamName).str(),
-          inconvertibleErrorCode());
-    }
-  }
-  return Result;
-}
-
-Expected<StackLifetime::LivenessType>
-parseStackLifetimeOptions(StringRef Params) {
-  StackLifetime::LivenessType Result = StackLifetime::LivenessType::May;
-  while (!Params.empty()) {
-    StringRef ParamName;
-    std::tie(ParamName, Params) = Params.split(';');
-
-    if (ParamName == "may") {
-      Result = StackLifetime::LivenessType::May;
-    } else if (ParamName == "must") {
-      Result = StackLifetime::LivenessType::Must;
-    } else {
-      return make_error<StringError>(
-          formatv("invalid StackLifetime parameter '{0}' ", ParamName).str(),
-          inconvertibleErrorCode());
-    }
-  }
-  return Result;
-}
-
-} // namespace
-
-/// Tests whether a pass name starts with a valid prefix for a default pipeline
-/// alias.
-static bool startsWithDefaultPipelineAliasPrefix(StringRef Name) {
-  return Name.startswith("default") || Name.startswith("thinlto") ||
-         Name.startswith("lto");
-}
-
-/// Tests whether registered callbacks will accept a given pass name.
-///
-/// When parsing a pipeline text, the type of the outermost pipeline may be
-/// omitted, in which case the type is automatically determined from the first
-/// pass name in the text. This may be a name that is handled through one of the
-/// callbacks. We check this through the oridinary parsing callbacks by setting
-/// up a dummy PassManager in order to not force the client to also handle this
-/// type of query.
-template <typename PassManagerT, typename CallbacksT>
-static bool callbacksAcceptPassName(StringRef Name, CallbacksT &Callbacks) {
-  if (!Callbacks.empty()) {
-    PassManagerT DummyPM;
-    for (auto &CB : Callbacks)
-      if (CB(Name, DummyPM, {}))
-        return true;
-  }
-  return false;
-}
-
-template <typename CallbacksT>
-static bool isModulePassName(StringRef Name, CallbacksT &Callbacks) {
-  // Manually handle aliases for pre-configured pipeline fragments.
-  if (startsWithDefaultPipelineAliasPrefix(Name))
-    return DefaultAliasRegex.match(Name);
-
-  // Explicitly handle pass manager names.
-  if (Name == "module")
-    return true;
-  if (Name == "cgscc")
-    return true;
-  if (Name == "function")
-    return true;
-
-  // Explicitly handle custom-parsed pass names.
-  if (parseRepeatPassName(Name))
-    return true;
-
-#define MODULE_PASS(NAME, CREATE_PASS)                                         \
-  if (Name == NAME)                                                            \
-    return true;
-#define MODULE_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)      \
-  if (checkParametrizedPassName(Name, NAME))                                   \
-    return true;
-#define MODULE_ANALYSIS(NAME, CREATE_PASS)                                     \
-  if (Name == "require<" NAME ">" || Name == "invalidate<" NAME ">")           \
-    return true;
-#include "PassRegistry.def"
-
-  return callbacksAcceptPassName<ModulePassManager>(Name, Callbacks);
-}
-
-template <typename CallbacksT>
-static bool isCGSCCPassName(StringRef Name, CallbacksT &Callbacks) {
-  // Explicitly handle pass manager names.
-  if (Name == "cgscc")
-    return true;
-  if (Name == "function")
-    return true;
-
-  // Explicitly handle custom-parsed pass names.
-  if (parseRepeatPassName(Name))
-    return true;
-  if (parseDevirtPassName(Name))
-    return true;
-
-#define CGSCC_PASS(NAME, CREATE_PASS)                                          \
-  if (Name == NAME)                                                            \
-    return true;
-#define CGSCC_ANALYSIS(NAME, CREATE_PASS)                                      \
-  if (Name == "require<" NAME ">" || Name == "invalidate<" NAME ">")           \
-    return true;
-#include "PassRegistry.def"
-
-  return callbacksAcceptPassName<CGSCCPassManager>(Name, Callbacks);
-}
-
-template <typename CallbacksT>
-static bool isFunctionPassName(StringRef Name, CallbacksT &Callbacks) {
-  // Explicitly handle pass manager names.
-  if (Name == "function")
-    return true;
-  if (Name == "loop" || Name == "loop-mssa")
-    return true;
-
-  // Explicitly handle custom-parsed pass names.
-  if (parseRepeatPassName(Name))
-    return true;
-
-#define FUNCTION_PASS(NAME, CREATE_PASS)                                       \
-  if (Name == NAME)                                                            \
-    return true;
-#define FUNCTION_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)    \
-  if (checkParametrizedPassName(Name, NAME))                                   \
-    return true;
-#define FUNCTION_ANALYSIS(NAME, CREATE_PASS)                                   \
-  if (Name == "require<" NAME ">" || Name == "invalidate<" NAME ">")           \
-    return true;
-#include "PassRegistry.def"
-
-  return callbacksAcceptPassName<FunctionPassManager>(Name, Callbacks);
-}
-
-template <typename CallbacksT>
-static bool isLoopPassName(StringRef Name, CallbacksT &Callbacks,
-                           bool &UseMemorySSA) {
-  UseMemorySSA = false;
-
-  // Explicitly handle custom-parsed pass names.
-  if (parseRepeatPassName(Name))
-    return true;
-
-  if (Name == "licm") {
-    UseMemorySSA = true;
-    return true;
-  }
-
-#define LOOP_PASS(NAME, CREATE_PASS)                                           \
-  if (Name == NAME)                                                            \
-    return true;
-#define LOOP_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)        \
-  if (checkParametrizedPassName(Name, NAME))                                   \
-    return true;
-#define LOOP_ANALYSIS(NAME, CREATE_PASS)                                       \
-  if (Name == "require<" NAME ">" || Name == "invalidate<" NAME ">")           \
-    return true;
-#include "PassRegistry.def"
-
-  return callbacksAcceptPassName<LoopPassManager>(Name, Callbacks);
-}
-
-Optional<std::vector<PassBuilder::PipelineElement>>
-PassBuilder::parsePipelineText(StringRef Text) {
-  std::vector<PipelineElement> ResultPipeline;
-
-  SmallVector<std::vector<PipelineElement> *, 4> PipelineStack = {
-      &ResultPipeline};
-  for (;;) {
-    std::vector<PipelineElement> &Pipeline = *PipelineStack.back();
-    size_t Pos = Text.find_first_of(",()");
-    Pipeline.push_back({Text.substr(0, Pos), {}});
-
-    // If we have a single terminating name, we're done.
-    if (Pos == Text.npos)
-      break;
-
-    char Sep = Text[Pos];
-    Text = Text.substr(Pos + 1);
-    if (Sep == ',')
-      // Just a name ending in a comma, continue.
-      continue;
-
-    if (Sep == '(') {
-      // Push the inner pipeline onto the stack to continue processing.
-      PipelineStack.push_back(&Pipeline.back().InnerPipeline);
-      continue;
-    }
-
-    assert(Sep == ')' && "Bogus separator!");
-    // When handling the close parenthesis, we greedily consume them to avoid
-    // empty strings in the pipeline.
-    do {
-      // If we try to pop the outer pipeline we have unbalanced parentheses.
-      if (PipelineStack.size() == 1)
-        return None;
-
-      PipelineStack.pop_back();
-    } while (Text.consume_front(")"));
-
-    // Check if we've finished parsing.
-    if (Text.empty())
-      break;
-
-    // Otherwise, the end of an inner pipeline always has to be followed by
-    // a comma, and then we can continue.
-    if (!Text.consume_front(","))
-      return None;
-  }
-
-  if (PipelineStack.size() > 1)
-    // Unbalanced paretheses.
-    return None;
-
-  assert(PipelineStack.back() == &ResultPipeline &&
-         "Wrong pipeline at the bottom of the stack!");
-  return {std::move(ResultPipeline)};
-}
-
-Error PassBuilder::parseModulePass(ModulePassManager &MPM,
-                                   const PipelineElement &E) {
-  auto &Name = E.Name;
-  auto &InnerPipeline = E.InnerPipeline;
-
-  // First handle complex passes like the pass managers which carry pipelines.
-  if (!InnerPipeline.empty()) {
-    if (Name == "module") {
-      ModulePassManager NestedMPM;
-      if (auto Err = parseModulePassPipeline(NestedMPM, InnerPipeline))
-        return Err;
-      MPM.addPass(std::move(NestedMPM));
-      return Error::success();
-    }
-    if (Name == "cgscc") {
-      CGSCCPassManager CGPM;
-      if (auto Err = parseCGSCCPassPipeline(CGPM, InnerPipeline))
-        return Err;
-      MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(std::move(CGPM)));
-      return Error::success();
-    }
-    if (Name == "function") {
-      FunctionPassManager FPM;
-      if (auto Err = parseFunctionPassPipeline(FPM, InnerPipeline))
-        return Err;
-      MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
-      return Error::success();
-    }
-    if (auto Count = parseRepeatPassName(Name)) {
-      ModulePassManager NestedMPM;
-      if (auto Err = parseModulePassPipeline(NestedMPM, InnerPipeline))
-        return Err;
-      MPM.addPass(createRepeatedPass(*Count, std::move(NestedMPM)));
-      return Error::success();
-    }
-
-    for (auto &C : ModulePipelineParsingCallbacks)
-      if (C(Name, MPM, InnerPipeline))
-        return Error::success();
-
-    // Normal passes can't have pipelines.
-    return make_error<StringError>(
-        formatv("invalid use of '{0}' pass as module pipeline", Name).str(),
-        inconvertibleErrorCode());
-    ;
-  }
-
-  // Manually handle aliases for pre-configured pipeline fragments.
-  if (startsWithDefaultPipelineAliasPrefix(Name)) {
-    SmallVector<StringRef, 3> Matches;
-    if (!DefaultAliasRegex.match(Name, &Matches))
-      return make_error<StringError>(
-          formatv("unknown default pipeline alias '{0}'", Name).str(),
-          inconvertibleErrorCode());
-
-    assert(Matches.size() == 3 && "Must capture two matched strings!");
-
-    OptimizationLevel L = StringSwitch<OptimizationLevel>(Matches[2])
-                              .Case("O0", OptimizationLevel::O0)
-                              .Case("O1", OptimizationLevel::O1)
-                              .Case("O2", OptimizationLevel::O2)
-                              .Case("O3", OptimizationLevel::O3)
-                              .Case("Os", OptimizationLevel::Os)
-                              .Case("Oz", OptimizationLevel::Oz);
-    if (L == OptimizationLevel::O0 && Matches[1] != "thinlto" &&
-        Matches[1] != "lto") {
-      MPM.addPass(buildO0DefaultPipeline(L, Matches[1] == "thinlto-pre-link" ||
-                                                Matches[1] == "lto-pre-link"));
-      return Error::success();
-    }
-
-    // This is consistent with old pass manager invoked via opt, but
-    // inconsistent with clang. Clang doesn't enable loop vectorization
-    // but does enable slp vectorization at Oz.
-    PTO.LoopVectorization =
-        L.getSpeedupLevel() > 1 && L != OptimizationLevel::Oz;
-    PTO.SLPVectorization =
-        L.getSpeedupLevel() > 1 && L != OptimizationLevel::Oz;
-
-    if (Matches[1] == "default") {
-      MPM.addPass(buildPerModuleDefaultPipeline(L));
-    } else if (Matches[1] == "thinlto-pre-link") {
-      MPM.addPass(buildThinLTOPreLinkDefaultPipeline(L));
-    } else if (Matches[1] == "thinlto") {
-      MPM.addPass(buildThinLTODefaultPipeline(L, nullptr));
-    } else if (Matches[1] == "lto-pre-link") {
-      MPM.addPass(buildLTOPreLinkDefaultPipeline(L));
-    } else {
-      assert(Matches[1] == "lto" && "Not one of the matched options!");
-      MPM.addPass(buildLTODefaultPipeline(L, nullptr));
-    }
-    return Error::success();
-  }
-
-  // Finally expand the basic registered passes from the .inc file.
-#define MODULE_PASS(NAME, CREATE_PASS)                                         \
-  if (Name == NAME) {                                                          \
-    MPM.addPass(CREATE_PASS);                                                  \
-    return Error::success();                                                   \
-  }
-#define MODULE_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)      \
-  if (checkParametrizedPassName(Name, NAME)) {                                 \
-    auto Params = parsePassParameters(PARSER, Name, NAME);                     \
-    if (!Params)                                                               \
-      return Params.takeError();                                               \
-    MPM.addPass(CREATE_PASS(Params.get()));                                    \
-    return Error::success();                                                   \
-  }
-#define MODULE_ANALYSIS(NAME, CREATE_PASS)                                     \
-  if (Name == "require<" NAME ">") {                                           \
-    MPM.addPass(                                                               \
-        RequireAnalysisPass<                                                   \
-            std::remove_reference<decltype(CREATE_PASS)>::type, Module>());    \
-    return Error::success();                                                   \
-  }                                                                            \
-  if (Name == "invalidate<" NAME ">") {                                        \
-    MPM.addPass(InvalidateAnalysisPass<                                        \
-                std::remove_reference<decltype(CREATE_PASS)>::type>());        \
-    return Error::success();                                                   \
-  }
-#define CGSCC_PASS(NAME, CREATE_PASS)                                          \
-  if (Name == NAME) {                                                          \
-    MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(CREATE_PASS));         \
-    return Error::success();                                                   \
-  }
-#define FUNCTION_PASS(NAME, CREATE_PASS)                                       \
-  if (Name == NAME) {                                                          \
-    MPM.addPass(createModuleToFunctionPassAdaptor(CREATE_PASS));               \
-    return Error::success();                                                   \
-  }
-#define FUNCTION_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)    \
-  if (checkParametrizedPassName(Name, NAME)) {                                 \
-    auto Params = parsePassParameters(PARSER, Name, NAME);                     \
-    if (!Params)                                                               \
-      return Params.takeError();                                               \
-    MPM.addPass(createModuleToFunctionPassAdaptor(CREATE_PASS(Params.get()))); \
-    return Error::success();                                                   \
-  }
-#define LOOP_PASS(NAME, CREATE_PASS)                                           \
-  if (Name == NAME) {                                                          \
-    MPM.addPass(createModuleToFunctionPassAdaptor(                             \
-        createFunctionToLoopPassAdaptor(CREATE_PASS, false, false)));          \
-    return Error::success();                                                   \
-  }
-#define LOOP_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)        \
-  if (checkParametrizedPassName(Name, NAME)) {                                 \
-    auto Params = parsePassParameters(PARSER, Name, NAME);                     \
-    if (!Params)                                                               \
-      return Params.takeError();                                               \
-    MPM.addPass(                                                               \
-        createModuleToFunctionPassAdaptor(createFunctionToLoopPassAdaptor(     \
-            CREATE_PASS(Params.get()), false, false)));                        \
-    return Error::success();                                                   \
-  }
-#include "PassRegistry.def"
-
-  for (auto &C : ModulePipelineParsingCallbacks)
-    if (C(Name, MPM, InnerPipeline))
-      return Error::success();
-  return make_error<StringError>(
-      formatv("unknown module pass '{0}'", Name).str(),
-      inconvertibleErrorCode());
-}
-
-Error PassBuilder::parseCGSCCPass(CGSCCPassManager &CGPM,
-                                  const PipelineElement &E) {
-  auto &Name = E.Name;
-  auto &InnerPipeline = E.InnerPipeline;
-
-  // First handle complex passes like the pass managers which carry pipelines.
-  if (!InnerPipeline.empty()) {
-    if (Name == "cgscc") {
-      CGSCCPassManager NestedCGPM;
-      if (auto Err = parseCGSCCPassPipeline(NestedCGPM, InnerPipeline))
-        return Err;
-      // Add the nested pass manager with the appropriate adaptor.
-      CGPM.addPass(std::move(NestedCGPM));
-      return Error::success();
-    }
-    if (Name == "function") {
-      FunctionPassManager FPM;
-      if (auto Err = parseFunctionPassPipeline(FPM, InnerPipeline))
-        return Err;
-      // Add the nested pass manager with the appropriate adaptor.
-      CGPM.addPass(createCGSCCToFunctionPassAdaptor(std::move(FPM)));
-      return Error::success();
-    }
-    if (auto Count = parseRepeatPassName(Name)) {
-      CGSCCPassManager NestedCGPM;
-      if (auto Err = parseCGSCCPassPipeline(NestedCGPM, InnerPipeline))
-        return Err;
-      CGPM.addPass(createRepeatedPass(*Count, std::move(NestedCGPM)));
-      return Error::success();
-    }
-    if (auto MaxRepetitions = parseDevirtPassName(Name)) {
-      CGSCCPassManager NestedCGPM;
-      if (auto Err = parseCGSCCPassPipeline(NestedCGPM, InnerPipeline))
-        return Err;
-      CGPM.addPass(
-          createDevirtSCCRepeatedPass(std::move(NestedCGPM), *MaxRepetitions));
-      return Error::success();
-    }
-
-    for (auto &C : CGSCCPipelineParsingCallbacks)
-      if (C(Name, CGPM, InnerPipeline))
-        return Error::success();
-
-    // Normal passes can't have pipelines.
-    return make_error<StringError>(
-        formatv("invalid use of '{0}' pass as cgscc pipeline", Name).str(),
-        inconvertibleErrorCode());
-  }
-
-// Now expand the basic registered passes from the .inc file.
-#define CGSCC_PASS(NAME, CREATE_PASS)                                          \
-  if (Name == NAME) {                                                          \
-    CGPM.addPass(CREATE_PASS);                                                 \
-    return Error::success();                                                   \
-  }
-#define CGSCC_ANALYSIS(NAME, CREATE_PASS)                                      \
-  if (Name == "require<" NAME ">") {                                           \
-    CGPM.addPass(RequireAnalysisPass<                                          \
-                 std::remove_reference<decltype(CREATE_PASS)>::type,           \
-                 LazyCallGraph::SCC, CGSCCAnalysisManager, LazyCallGraph &,    \
-                 CGSCCUpdateResult &>());                                      \
-    return Error::success();                                                   \
-  }                                                                            \
-  if (Name == "invalidate<" NAME ">") {                                        \
-    CGPM.addPass(InvalidateAnalysisPass<                                       \
-                 std::remove_reference<decltype(CREATE_PASS)>::type>());       \
-    return Error::success();                                                   \
-  }
-#define FUNCTION_PASS(NAME, CREATE_PASS)                                       \
-  if (Name == NAME) {                                                          \
-    CGPM.addPass(createCGSCCToFunctionPassAdaptor(CREATE_PASS));               \
-    return Error::success();                                                   \
-  }
-#define FUNCTION_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)    \
-  if (checkParametrizedPassName(Name, NAME)) {                                 \
-    auto Params = parsePassParameters(PARSER, Name, NAME);                     \
-    if (!Params)                                                               \
-      return Params.takeError();                                               \
-    CGPM.addPass(createCGSCCToFunctionPassAdaptor(CREATE_PASS(Params.get()))); \
-    return Error::success();                                                   \
-  }
-#define LOOP_PASS(NAME, CREATE_PASS)                                           \
-  if (Name == NAME) {                                                          \
-    CGPM.addPass(createCGSCCToFunctionPassAdaptor(                             \
-        createFunctionToLoopPassAdaptor(CREATE_PASS, false, false)));          \
-    return Error::success();                                                   \
-  }
-#define LOOP_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)        \
-  if (checkParametrizedPassName(Name, NAME)) {                                 \
-    auto Params = parsePassParameters(PARSER, Name, NAME);                     \
-    if (!Params)                                                               \
-      return Params.takeError();                                               \
-    CGPM.addPass(                                                              \
-        createCGSCCToFunctionPassAdaptor(createFunctionToLoopPassAdaptor(      \
-            CREATE_PASS(Params.get()), false, false)));                        \
-    return Error::success();                                                   \
-  }
-#include "PassRegistry.def"
-
-  for (auto &C : CGSCCPipelineParsingCallbacks)
-    if (C(Name, CGPM, InnerPipeline))
-      return Error::success();
-  return make_error<StringError>(
-      formatv("unknown cgscc pass '{0}'", Name).str(),
-      inconvertibleErrorCode());
-}
-
-Error PassBuilder::parseFunctionPass(FunctionPassManager &FPM,
-                                     const PipelineElement &E) {
-  auto &Name = E.Name;
-  auto &InnerPipeline = E.InnerPipeline;
-
-  // First handle complex passes like the pass managers which carry pipelines.
-  if (!InnerPipeline.empty()) {
-    if (Name == "function") {
-      FunctionPassManager NestedFPM;
-      if (auto Err = parseFunctionPassPipeline(NestedFPM, InnerPipeline))
-        return Err;
-      // Add the nested pass manager with the appropriate adaptor.
-      FPM.addPass(std::move(NestedFPM));
-      return Error::success();
-    }
-    if (Name == "loop" || Name == "loop-mssa") {
-      LoopPassManager LPM;
-      if (auto Err = parseLoopPassPipeline(LPM, InnerPipeline))
-        return Err;
-      // Add the nested pass manager with the appropriate adaptor.
-      bool UseMemorySSA = (Name == "loop-mssa");
-      bool UseBFI = llvm::any_of(
-          InnerPipeline, [](auto Pipeline) { return Pipeline.Name == "licm"; });
-      FPM.addPass(createFunctionToLoopPassAdaptor(std::move(LPM), UseMemorySSA,
-                                                  UseBFI));
-      return Error::success();
-    }
-    if (auto Count = parseRepeatPassName(Name)) {
-      FunctionPassManager NestedFPM;
-      if (auto Err = parseFunctionPassPipeline(NestedFPM, InnerPipeline))
-        return Err;
-      FPM.addPass(createRepeatedPass(*Count, std::move(NestedFPM)));
-      return Error::success();
-    }
-
-    for (auto &C : FunctionPipelineParsingCallbacks)
-      if (C(Name, FPM, InnerPipeline))
-        return Error::success();
-
-    // Normal passes can't have pipelines.
-    return make_error<StringError>(
-        formatv("invalid use of '{0}' pass as function pipeline", Name).str(),
-        inconvertibleErrorCode());
-  }
-
-// Now expand the basic registered passes from the .inc file.
-#define FUNCTION_PASS(NAME, CREATE_PASS)                                       \
-  if (Name == NAME) {                                                          \
-    FPM.addPass(CREATE_PASS);                                                  \
-    return Error::success();                                                   \
-  }
-#define FUNCTION_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)    \
-  if (checkParametrizedPassName(Name, NAME)) {                                 \
-    auto Params = parsePassParameters(PARSER, Name, NAME);                     \
-    if (!Params)                                                               \
-      return Params.takeError();                                               \
-    FPM.addPass(CREATE_PASS(Params.get()));                                    \
-    return Error::success();                                                   \
-  }
-#define FUNCTION_ANALYSIS(NAME, CREATE_PASS)                                   \
-  if (Name == "require<" NAME ">") {                                           \
-    FPM.addPass(                                                               \
-        RequireAnalysisPass<                                                   \
-            std::remove_reference<decltype(CREATE_PASS)>::type, Function>());  \
-    return Error::success();                                                   \
-  }                                                                            \
-  if (Name == "invalidate<" NAME ">") {                                        \
-    FPM.addPass(InvalidateAnalysisPass<                                        \
-                std::remove_reference<decltype(CREATE_PASS)>::type>());        \
-    return Error::success();                                                   \
-  }
-// FIXME: UseMemorySSA is set to false. Maybe we could do things like:
-//        bool UseMemorySSA = !("canon-freeze" || "loop-predication" ||
-//                              "guard-widening");
-//        The risk is that it may become obsolete if we're not careful.
-#define LOOP_PASS(NAME, CREATE_PASS)                                           \
-  if (Name == NAME) {                                                          \
-    FPM.addPass(createFunctionToLoopPassAdaptor(CREATE_PASS, false, false));   \
-    return Error::success();                                                   \
-  }
-#define LOOP_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)        \
-  if (checkParametrizedPassName(Name, NAME)) {                                 \
-    auto Params = parsePassParameters(PARSER, Name, NAME);                     \
-    if (!Params)                                                               \
-      return Params.takeError();                                               \
-    FPM.addPass(createFunctionToLoopPassAdaptor(CREATE_PASS(Params.get()),     \
-                                                false, false));                \
-    return Error::success();                                                   \
-  }
-#include "PassRegistry.def"
-
-  for (auto &C : FunctionPipelineParsingCallbacks)
-    if (C(Name, FPM, InnerPipeline))
-      return Error::success();
-  return make_error<StringError>(
-      formatv("unknown function pass '{0}'", Name).str(),
-      inconvertibleErrorCode());
-}
-
-Error PassBuilder::parseLoopPass(LoopPassManager &LPM,
-                                 const PipelineElement &E) {
-  StringRef Name = E.Name;
-  auto &InnerPipeline = E.InnerPipeline;
-
-  // First handle complex passes like the pass managers which carry pipelines.
-  if (!InnerPipeline.empty()) {
-    if (Name == "loop") {
-      LoopPassManager NestedLPM;
-      if (auto Err = parseLoopPassPipeline(NestedLPM, InnerPipeline))
-        return Err;
-      // Add the nested pass manager with the appropriate adaptor.
-      LPM.addPass(std::move(NestedLPM));
-      return Error::success();
-    }
-    if (auto Count = parseRepeatPassName(Name)) {
-      LoopPassManager NestedLPM;
-      if (auto Err = parseLoopPassPipeline(NestedLPM, InnerPipeline))
-        return Err;
-      LPM.addPass(createRepeatedPass(*Count, std::move(NestedLPM)));
-      return Error::success();
-    }
-
-    for (auto &C : LoopPipelineParsingCallbacks)
-      if (C(Name, LPM, InnerPipeline))
-        return Error::success();
-
-    // Normal passes can't have pipelines.
-    return make_error<StringError>(
-        formatv("invalid use of '{0}' pass as loop pipeline", Name).str(),
-        inconvertibleErrorCode());
-  }
-
-// Now expand the basic registered passes from the .inc file.
-#define LOOP_PASS(NAME, CREATE_PASS)                                           \
-  if (Name == NAME) {                                                          \
-    LPM.addPass(CREATE_PASS);                                                  \
-    return Error::success();                                                   \
-  }
-#define LOOP_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)        \
-  if (checkParametrizedPassName(Name, NAME)) {                                 \
-    auto Params = parsePassParameters(PARSER, Name, NAME);                     \
-    if (!Params)                                                               \
-      return Params.takeError();                                               \
-    LPM.addPass(CREATE_PASS(Params.get()));                                    \
-    return Error::success();                                                   \
-  }
-#define LOOP_ANALYSIS(NAME, CREATE_PASS)                                       \
-  if (Name == "require<" NAME ">") {                                           \
-    LPM.addPass(RequireAnalysisPass<                                           \
-                std::remove_reference<decltype(CREATE_PASS)>::type, Loop,      \
-                LoopAnalysisManager, LoopStandardAnalysisResults &,            \
-                LPMUpdater &>());                                              \
-    return Error::success();                                                   \
-  }                                                                            \
-  if (Name == "invalidate<" NAME ">") {                                        \
-    LPM.addPass(InvalidateAnalysisPass<                                        \
-                std::remove_reference<decltype(CREATE_PASS)>::type>());        \
-    return Error::success();                                                   \
-  }
-#include "PassRegistry.def"
-
-  for (auto &C : LoopPipelineParsingCallbacks)
-    if (C(Name, LPM, InnerPipeline))
-      return Error::success();
-  return make_error<StringError>(formatv("unknown loop pass '{0}'", Name).str(),
-                                 inconvertibleErrorCode());
-}
-
-bool PassBuilder::parseAAPassName(AAManager &AA, StringRef Name) {
-#define MODULE_ALIAS_ANALYSIS(NAME, CREATE_PASS)                               \
-  if (Name == NAME) {                                                          \
-    AA.registerModuleAnalysis<                                                 \
-        std::remove_reference<decltype(CREATE_PASS)>::type>();                 \
-    return true;                                                               \
-  }
-#define FUNCTION_ALIAS_ANALYSIS(NAME, CREATE_PASS)                             \
-  if (Name == NAME) {                                                          \
-    AA.registerFunctionAnalysis<                                               \
-        std::remove_reference<decltype(CREATE_PASS)>::type>();                 \
-    return true;                                                               \
-  }
-#include "PassRegistry.def"
-
-  for (auto &C : AAParsingCallbacks)
-    if (C(Name, AA))
-      return true;
-  return false;
-}
-
-Error PassBuilder::parseLoopPassPipeline(LoopPassManager &LPM,
-                                         ArrayRef<PipelineElement> Pipeline) {
-  for (const auto &Element : Pipeline) {
-    if (auto Err = parseLoopPass(LPM, Element))
-      return Err;
-  }
-  return Error::success();
-}
-
-Error PassBuilder::parseFunctionPassPipeline(
-    FunctionPassManager &FPM, ArrayRef<PipelineElement> Pipeline) {
-  for (const auto &Element : Pipeline) {
-    if (auto Err = parseFunctionPass(FPM, Element))
-      return Err;
-  }
-  return Error::success();
-}
-
-Error PassBuilder::parseCGSCCPassPipeline(CGSCCPassManager &CGPM,
-                                          ArrayRef<PipelineElement> Pipeline) {
-  for (const auto &Element : Pipeline) {
-    if (auto Err = parseCGSCCPass(CGPM, Element))
-      return Err;
-  }
-  return Error::success();
-}
-
-void PassBuilder::crossRegisterProxies(LoopAnalysisManager &LAM,
-                                       FunctionAnalysisManager &FAM,
-                                       CGSCCAnalysisManager &CGAM,
-                                       ModuleAnalysisManager &MAM) {
-  MAM.registerPass([&] { return FunctionAnalysisManagerModuleProxy(FAM); });
-  MAM.registerPass([&] { return CGSCCAnalysisManagerModuleProxy(CGAM); });
-  CGAM.registerPass([&] { return ModuleAnalysisManagerCGSCCProxy(MAM); });
-  FAM.registerPass([&] { return CGSCCAnalysisManagerFunctionProxy(CGAM); });
-  FAM.registerPass([&] { return ModuleAnalysisManagerFunctionProxy(MAM); });
-  FAM.registerPass([&] { return LoopAnalysisManagerFunctionProxy(LAM); });
-  LAM.registerPass([&] { return FunctionAnalysisManagerLoopProxy(FAM); });
-}
-
-Error PassBuilder::parseModulePassPipeline(ModulePassManager &MPM,
-                                           ArrayRef<PipelineElement> Pipeline) {
-  for (const auto &Element : Pipeline) {
-    if (auto Err = parseModulePass(MPM, Element))
-      return Err;
-  }
-  return Error::success();
-}
-
-// Primary pass pipeline description parsing routine for a \c ModulePassManager
-// FIXME: Should this routine accept a TargetMachine or require the caller to
-// pre-populate the analysis managers with target-specific stuff?
-Error PassBuilder::parsePassPipeline(ModulePassManager &MPM,
-                                     StringRef PipelineText) {
-  auto Pipeline = parsePipelineText(PipelineText);
-  if (!Pipeline || Pipeline->empty())
-    return make_error<StringError>(
-        formatv("invalid pipeline '{0}'", PipelineText).str(),
-        inconvertibleErrorCode());
-
-  // If the first name isn't at the module layer, wrap the pipeline up
-  // automatically.
-  StringRef FirstName = Pipeline->front().Name;
-
-  if (!isModulePassName(FirstName, ModulePipelineParsingCallbacks)) {
-    bool UseMemorySSA;
-    if (isCGSCCPassName(FirstName, CGSCCPipelineParsingCallbacks)) {
-      Pipeline = {{"cgscc", std::move(*Pipeline)}};
-    } else if (isFunctionPassName(FirstName,
-                                  FunctionPipelineParsingCallbacks)) {
-      Pipeline = {{"function", std::move(*Pipeline)}};
-    } else if (isLoopPassName(FirstName, LoopPipelineParsingCallbacks,
-                              UseMemorySSA)) {
-      Pipeline = {{"function", {{UseMemorySSA ? "loop-mssa" : "loop",
-                                 std::move(*Pipeline)}}}};
-    } else {
-      for (auto &C : TopLevelPipelineParsingCallbacks)
-        if (C(MPM, *Pipeline))
-          return Error::success();
-
-      // Unknown pass or pipeline name!
-      auto &InnerPipeline = Pipeline->front().InnerPipeline;
-      return make_error<StringError>(
-          formatv("unknown {0} name '{1}'",
-                  (InnerPipeline.empty() ? "pass" : "pipeline"), FirstName)
-              .str(),
-          inconvertibleErrorCode());
-    }
-  }
-
-  if (auto Err = parseModulePassPipeline(MPM, *Pipeline))
-    return Err;
-  return Error::success();
-}
-
-// Primary pass pipeline description parsing routine for a \c CGSCCPassManager
-Error PassBuilder::parsePassPipeline(CGSCCPassManager &CGPM,
-                                     StringRef PipelineText) {
-  auto Pipeline = parsePipelineText(PipelineText);
-  if (!Pipeline || Pipeline->empty())
-    return make_error<StringError>(
-        formatv("invalid pipeline '{0}'", PipelineText).str(),
-        inconvertibleErrorCode());
-
-  StringRef FirstName = Pipeline->front().Name;
-  if (!isCGSCCPassName(FirstName, CGSCCPipelineParsingCallbacks))
-    return make_error<StringError>(
-        formatv("unknown cgscc pass '{0}' in pipeline '{1}'", FirstName,
-                PipelineText)
-            .str(),
-        inconvertibleErrorCode());
-
-  if (auto Err = parseCGSCCPassPipeline(CGPM, *Pipeline))
-    return Err;
-  return Error::success();
-}
-
-// Primary pass pipeline description parsing routine for a \c
-// FunctionPassManager
-Error PassBuilder::parsePassPipeline(FunctionPassManager &FPM,
-                                     StringRef PipelineText) {
-  auto Pipeline = parsePipelineText(PipelineText);
-  if (!Pipeline || Pipeline->empty())
-    return make_error<StringError>(
-        formatv("invalid pipeline '{0}'", PipelineText).str(),
-        inconvertibleErrorCode());
-
-  StringRef FirstName = Pipeline->front().Name;
-  if (!isFunctionPassName(FirstName, FunctionPipelineParsingCallbacks))
-    return make_error<StringError>(
-        formatv("unknown function pass '{0}' in pipeline '{1}'", FirstName,
-                PipelineText)
-            .str(),
-        inconvertibleErrorCode());
-
-  if (auto Err = parseFunctionPassPipeline(FPM, *Pipeline))
-    return Err;
-  return Error::success();
-}
-
-// Primary pass pipeline description parsing routine for a \c LoopPassManager
-Error PassBuilder::parsePassPipeline(LoopPassManager &CGPM,
-                                     StringRef PipelineText) {
-  auto Pipeline = parsePipelineText(PipelineText);
-  if (!Pipeline || Pipeline->empty())
-    return make_error<StringError>(
-        formatv("invalid pipeline '{0}'", PipelineText).str(),
-        inconvertibleErrorCode());
-
-  if (auto Err = parseLoopPassPipeline(CGPM, *Pipeline))
-    return Err;
-
-  return Error::success();
-}
-
-Error PassBuilder::parseAAPipeline(AAManager &AA, StringRef PipelineText) {
-  // If the pipeline just consists of the word 'default' just replace the AA
-  // manager with our default one.
-  if (PipelineText == "default") {
-    AA = buildDefaultAAPipeline();
-    return Error::success();
-  }
-
-  while (!PipelineText.empty()) {
-    StringRef Name;
-    std::tie(Name, PipelineText) = PipelineText.split(',');
-    if (!parseAAPassName(AA, Name))
-      return make_error<StringError>(
-          formatv("unknown alias analysis name '{0}'", Name).str(),
-          inconvertibleErrorCode());
-  }
-
-  return Error::success();
-}
-
-bool PassBuilder::isAAPassName(StringRef PassName) {
-#define MODULE_ALIAS_ANALYSIS(NAME, CREATE_PASS)                               \
-  if (PassName == NAME)                                                        \
-    return true;
-#define FUNCTION_ALIAS_ANALYSIS(NAME, CREATE_PASS)                             \
-  if (PassName == NAME)                                                        \
-    return true;
-#include "PassRegistry.def"
-  return false;
-}
-
-bool PassBuilder::isAnalysisPassName(StringRef PassName) {
-#define MODULE_ANALYSIS(NAME, CREATE_PASS)                                     \
-  if (PassName == NAME)                                                        \
-    return true;
-#define FUNCTION_ANALYSIS(NAME, CREATE_PASS)                                   \
-  if (PassName == NAME)                                                        \
-    return true;
-#define LOOP_ANALYSIS(NAME, CREATE_PASS)                                       \
-  if (PassName == NAME)                                                        \
-    return true;
-#define CGSCC_ANALYSIS(NAME, CREATE_PASS)                                      \
-  if (PassName == NAME)                                                        \
-    return true;
-#define MODULE_ALIAS_ANALYSIS(NAME, CREATE_PASS)                               \
-  if (PassName == NAME)                                                        \
-    return true;
-#define FUNCTION_ALIAS_ANALYSIS(NAME, CREATE_PASS)                             \
-  if (PassName == NAME)                                                        \
-    return true;
-#include "PassRegistry.def"
-  return false;
-}
-
-static void printPassName(StringRef PassName, raw_ostream &OS) {
-  OS << "  " << PassName << "\n";
-}
-static void printPassName(StringRef PassName, StringRef Params,
-                          raw_ostream &OS) {
-  OS << "  " << PassName << "<" << Params << ">\n";
-}
-
-void PassBuilder::printPassNames(raw_ostream &OS) {
-  // TODO: print pass descriptions when they are available
-
-  OS << "Module passes:\n";
-#define MODULE_PASS(NAME, CREATE_PASS) printPassName(NAME, OS);
-#include "PassRegistry.def"
-
-  OS << "Module passes with params:\n";
-#define MODULE_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)      \
-  printPassName(NAME, PARAMS, OS);
-#include "PassRegistry.def"
-
-  OS << "Module analyses:\n";
-#define MODULE_ANALYSIS(NAME, CREATE_PASS) printPassName(NAME, OS);
-#include "PassRegistry.def"
-
-  OS << "Module alias analyses:\n";
-#define MODULE_ALIAS_ANALYSIS(NAME, CREATE_PASS) printPassName(NAME, OS);
-#include "PassRegistry.def"
-
-  OS << "CGSCC passes:\n";
-#define CGSCC_PASS(NAME, CREATE_PASS) printPassName(NAME, OS);
-#include "PassRegistry.def"
-
-  OS << "CGSCC analyses:\n";
-#define CGSCC_ANALYSIS(NAME, CREATE_PASS) printPassName(NAME, OS);
-#include "PassRegistry.def"
-
-  OS << "Function passes:\n";
-#define FUNCTION_PASS(NAME, CREATE_PASS) printPassName(NAME, OS);
-#include "PassRegistry.def"
-
-  OS << "Function passes with params:\n";
-#define FUNCTION_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)    \
-  printPassName(NAME, PARAMS, OS);
-#include "PassRegistry.def"
-
-  OS << "Function analyses:\n";
-#define FUNCTION_ANALYSIS(NAME, CREATE_PASS) printPassName(NAME, OS);
-#include "PassRegistry.def"
-
-  OS << "Function alias analyses:\n";
-#define FUNCTION_ALIAS_ANALYSIS(NAME, CREATE_PASS) printPassName(NAME, OS);
-#include "PassRegistry.def"
-
-  OS << "Loop passes:\n";
-#define LOOP_PASS(NAME, CREATE_PASS) printPassName(NAME, OS);
-#include "PassRegistry.def"
-
-  OS << "Loop passes with params:\n";
-#define LOOP_PASS_WITH_PARAMS(NAME, CLASS, CREATE_PASS, PARSER, PARAMS)        \
-  printPassName(NAME, PARAMS, OS);
-#include "PassRegistry.def"
-
-  OS << "Loop analyses:\n";
-#define LOOP_ANALYSIS(NAME, CREATE_PASS) printPassName(NAME, OS);
-#include "PassRegistry.def"
-}
-
-void PassBuilder::registerParseTopLevelPipelineCallback(
-    const std::function<bool(ModulePassManager &, ArrayRef<PipelineElement>)>
-        &C) {
-  TopLevelPipelineParsingCallbacks.push_back(C);
-}

llvm/utils/gn/secondary/llvm/lib/Passes/BUILD.gn

deps = [
     "//llvm/lib/Transforms/InstCombine",
     "//llvm/lib/Transforms/Instrumentation",
     "//llvm/lib/Transforms/ObjCARC",
     "//llvm/lib/Transforms/Scalar",
     "//llvm/lib/Transforms/Utils",
     "//llvm/lib/Transforms/Vectorize",
   ]
   sources = [
+    "OptimizationLevel.cpp",
     "PassBuilder.cpp",
     "PassBuilderBindings.cpp",
+    "PassBuilderPipelines.cpp",
     "PassPlugin.cpp",
     "StandardInstrumentations.cpp",
   ]
 }