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Diffstat (limited to 'contrib/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp')
| -rw-r--r-- | contrib/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp | 1135 |
1 files changed, 0 insertions, 1135 deletions
diff --git a/contrib/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/contrib/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp deleted file mode 100644 index 3ea77f08fd3c..000000000000 --- a/contrib/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp +++ /dev/null @@ -1,1135 +0,0 @@ -//===- PassManagerBuilder.cpp - Build Standard Pass -----------------------===// -// -// 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 -// -//===----------------------------------------------------------------------===// -// -// This file defines the PassManagerBuilder class, which is used to set up a -// "standard" optimization sequence suitable for languages like C and C++. -// -//===----------------------------------------------------------------------===// - -#include "llvm/Transforms/IPO/PassManagerBuilder.h" -#include "llvm-c/Transforms/PassManagerBuilder.h" -#include "llvm/ADT/SmallVector.h" -#include "llvm/Analysis/BasicAliasAnalysis.h" -#include "llvm/Analysis/CFLAndersAliasAnalysis.h" -#include "llvm/Analysis/CFLSteensAliasAnalysis.h" -#include "llvm/Analysis/GlobalsModRef.h" -#include "llvm/Analysis/InlineCost.h" -#include "llvm/Analysis/Passes.h" -#include "llvm/Analysis/ScopedNoAliasAA.h" -#include "llvm/Analysis/TargetLibraryInfo.h" -#include "llvm/Analysis/TypeBasedAliasAnalysis.h" -#include "llvm/IR/DataLayout.h" -#include "llvm/IR/LegacyPassManager.h" -#include "llvm/IR/Verifier.h" -#include "llvm/Support/CommandLine.h" -#include "llvm/Support/ManagedStatic.h" -#include "llvm/Transforms/AggressiveInstCombine/AggressiveInstCombine.h" -#include "llvm/Transforms/IPO.h" -#include "llvm/Transforms/IPO/Attributor.h" -#include "llvm/Transforms/IPO/ForceFunctionAttrs.h" -#include "llvm/Transforms/IPO/FunctionAttrs.h" -#include "llvm/Transforms/IPO/InferFunctionAttrs.h" -#include "llvm/Transforms/InstCombine/InstCombine.h" -#include "llvm/Transforms/Instrumentation.h" -#include "llvm/Transforms/Scalar.h" -#include "llvm/Transforms/Scalar/GVN.h" -#include "llvm/Transforms/Scalar/InstSimplifyPass.h" -#include "llvm/Transforms/Scalar/LICM.h" -#include "llvm/Transforms/Scalar/LoopUnrollPass.h" -#include "llvm/Transforms/Scalar/SimpleLoopUnswitch.h" -#include "llvm/Transforms/Utils.h" -#include "llvm/Transforms/Vectorize.h" -#include "llvm/Transforms/Vectorize/LoopVectorize.h" -#include "llvm/Transforms/Vectorize/SLPVectorizer.h" - -using namespace llvm; - -static cl::opt<bool> - RunPartialInlining("enable-partial-inlining", cl::init(false), cl::Hidden, - cl::ZeroOrMore, cl::desc("Run Partial inlinining pass")); - -static cl::opt<bool> -UseGVNAfterVectorization("use-gvn-after-vectorization", - cl::init(false), cl::Hidden, - cl::desc("Run GVN instead of Early CSE after vectorization passes")); - -static cl::opt<bool> ExtraVectorizerPasses( - "extra-vectorizer-passes", cl::init(false), cl::Hidden, - cl::desc("Run cleanup optimization passes after vectorization.")); - -static cl::opt<bool> -RunLoopRerolling("reroll-loops", cl::Hidden, - cl::desc("Run the loop rerolling pass")); - -static cl::opt<bool> RunNewGVN("enable-newgvn", cl::init(false), cl::Hidden, - cl::desc("Run the NewGVN pass")); - -// Experimental option to use CFL-AA -enum class CFLAAType { None, Steensgaard, Andersen, Both }; -static cl::opt<CFLAAType> - UseCFLAA("use-cfl-aa", cl::init(CFLAAType::None), cl::Hidden, - cl::desc("Enable the new, experimental CFL alias analysis"), - cl::values(clEnumValN(CFLAAType::None, "none", "Disable CFL-AA"), - clEnumValN(CFLAAType::Steensgaard, "steens", - "Enable unification-based CFL-AA"), - clEnumValN(CFLAAType::Andersen, "anders", - "Enable inclusion-based CFL-AA"), - clEnumValN(CFLAAType::Both, "both", - "Enable both variants of CFL-AA"))); - -static cl::opt<bool> EnableLoopInterchange( - "enable-loopinterchange", cl::init(false), cl::Hidden, - cl::desc("Enable the new, experimental LoopInterchange Pass")); - -static cl::opt<bool> EnableUnrollAndJam("enable-unroll-and-jam", - cl::init(false), cl::Hidden, - cl::desc("Enable Unroll And Jam Pass")); - -static cl::opt<bool> - EnablePrepareForThinLTO("prepare-for-thinlto", cl::init(false), cl::Hidden, - cl::desc("Enable preparation for ThinLTO.")); - -static cl::opt<bool> - EnablePerformThinLTO("perform-thinlto", cl::init(false), cl::Hidden, - cl::desc("Enable performing ThinLTO.")); - -cl::opt<bool> EnableHotColdSplit("hot-cold-split", cl::init(false), cl::Hidden, - cl::desc("Enable hot-cold splitting pass")); - -static cl::opt<bool> UseLoopVersioningLICM( - "enable-loop-versioning-licm", cl::init(false), cl::Hidden, - cl::desc("Enable the experimental Loop Versioning LICM pass")); - -static cl::opt<bool> - DisablePreInliner("disable-preinline", cl::init(false), cl::Hidden, - cl::desc("Disable pre-instrumentation inliner")); - -static cl::opt<int> PreInlineThreshold( - "preinline-threshold", cl::Hidden, cl::init(75), cl::ZeroOrMore, - cl::desc("Control the amount of inlining in pre-instrumentation inliner " - "(default = 75)")); - -static cl::opt<bool> EnableGVNHoist( - "enable-gvn-hoist", cl::init(false), cl::Hidden, - cl::desc("Enable the GVN hoisting pass (default = off)")); - -static cl::opt<bool> - DisableLibCallsShrinkWrap("disable-libcalls-shrinkwrap", cl::init(false), - cl::Hidden, - cl::desc("Disable shrink-wrap library calls")); - -static cl::opt<bool> EnableSimpleLoopUnswitch( - "enable-simple-loop-unswitch", cl::init(false), cl::Hidden, - cl::desc("Enable the simple loop unswitch pass. Also enables independent " - "cleanup passes integrated into the loop pass manager pipeline.")); - -static cl::opt<bool> EnableGVNSink( - "enable-gvn-sink", cl::init(false), cl::Hidden, - cl::desc("Enable the GVN sinking pass (default = off)")); - -// This option is used in simplifying testing SampleFDO optimizations for -// profile loading. -static cl::opt<bool> - EnableCHR("enable-chr", cl::init(true), cl::Hidden, - cl::desc("Enable control height reduction optimization (CHR)")); - -cl::opt<bool> FlattenedProfileUsed( - "flattened-profile-used", cl::init(false), cl::Hidden, - cl::desc("Indicate the sample profile being used is flattened, i.e., " - "no inline hierachy exists in the profile. ")); - -cl::opt<bool> EnableOrderFileInstrumentation( - "enable-order-file-instrumentation", cl::init(false), cl::Hidden, - cl::desc("Enable order file instrumentation (default = off)")); - -PassManagerBuilder::PassManagerBuilder() { - OptLevel = 2; - SizeLevel = 0; - LibraryInfo = nullptr; - Inliner = nullptr; - DisableUnrollLoops = false; - SLPVectorize = RunSLPVectorization; - LoopVectorize = EnableLoopVectorization; - LoopsInterleaved = EnableLoopInterleaving; - RerollLoops = RunLoopRerolling; - NewGVN = RunNewGVN; - LicmMssaOptCap = SetLicmMssaOptCap; - LicmMssaNoAccForPromotionCap = SetLicmMssaNoAccForPromotionCap; - DisableGVNLoadPRE = false; - ForgetAllSCEVInLoopUnroll = ForgetSCEVInLoopUnroll; - VerifyInput = false; - VerifyOutput = false; - MergeFunctions = false; - PrepareForLTO = false; - EnablePGOInstrGen = false; - EnablePGOCSInstrGen = false; - EnablePGOCSInstrUse = false; - PGOInstrGen = ""; - PGOInstrUse = ""; - PGOSampleUse = ""; - PrepareForThinLTO = EnablePrepareForThinLTO; - PerformThinLTO = EnablePerformThinLTO; - DivergentTarget = false; -} - -PassManagerBuilder::~PassManagerBuilder() { - delete LibraryInfo; - delete Inliner; -} - -/// Set of global extensions, automatically added as part of the standard set. -static ManagedStatic<SmallVector<std::pair<PassManagerBuilder::ExtensionPointTy, - PassManagerBuilder::ExtensionFn>, 8> > GlobalExtensions; - -/// Check if GlobalExtensions is constructed and not empty. -/// Since GlobalExtensions is a managed static, calling 'empty()' will trigger -/// the construction of the object. -static bool GlobalExtensionsNotEmpty() { - return GlobalExtensions.isConstructed() && !GlobalExtensions->empty(); -} - -void PassManagerBuilder::addGlobalExtension( - PassManagerBuilder::ExtensionPointTy Ty, - PassManagerBuilder::ExtensionFn Fn) { - GlobalExtensions->push_back(std::make_pair(Ty, std::move(Fn))); -} - -void PassManagerBuilder::addExtension(ExtensionPointTy Ty, ExtensionFn Fn) { - Extensions.push_back(std::make_pair(Ty, std::move(Fn))); -} - -void PassManagerBuilder::addExtensionsToPM(ExtensionPointTy ETy, - legacy::PassManagerBase &PM) const { - if (GlobalExtensionsNotEmpty()) { - for (auto &Ext : *GlobalExtensions) { - if (Ext.first == ETy) - Ext.second(*this, PM); - } - } - for (unsigned i = 0, e = Extensions.size(); i != e; ++i) - if (Extensions[i].first == ETy) - Extensions[i].second(*this, PM); -} - -void PassManagerBuilder::addInitialAliasAnalysisPasses( - legacy::PassManagerBase &PM) const { - switch (UseCFLAA) { - case CFLAAType::Steensgaard: - PM.add(createCFLSteensAAWrapperPass()); - break; - case CFLAAType::Andersen: - PM.add(createCFLAndersAAWrapperPass()); - break; - case CFLAAType::Both: - PM.add(createCFLSteensAAWrapperPass()); - PM.add(createCFLAndersAAWrapperPass()); - break; - default: - break; - } - - // Add TypeBasedAliasAnalysis before BasicAliasAnalysis so that - // BasicAliasAnalysis wins if they disagree. This is intended to help - // support "obvious" type-punning idioms. - PM.add(createTypeBasedAAWrapperPass()); - PM.add(createScopedNoAliasAAWrapperPass()); -} - -void PassManagerBuilder::addInstructionCombiningPass( - legacy::PassManagerBase &PM) const { - bool ExpensiveCombines = OptLevel > 2; - PM.add(createInstructionCombiningPass(ExpensiveCombines)); -} - -void PassManagerBuilder::populateFunctionPassManager( - legacy::FunctionPassManager &FPM) { - addExtensionsToPM(EP_EarlyAsPossible, FPM); - FPM.add(createEntryExitInstrumenterPass()); - - // Add LibraryInfo if we have some. - if (LibraryInfo) - FPM.add(new TargetLibraryInfoWrapperPass(*LibraryInfo)); - - if (OptLevel == 0) return; - - addInitialAliasAnalysisPasses(FPM); - - FPM.add(createCFGSimplificationPass()); - FPM.add(createSROAPass()); - FPM.add(createEarlyCSEPass()); - FPM.add(createLowerExpectIntrinsicPass()); -} - -// Do PGO instrumentation generation or use pass as the option specified. -void PassManagerBuilder::addPGOInstrPasses(legacy::PassManagerBase &MPM, - bool IsCS = false) { - if (IsCS) { - if (!EnablePGOCSInstrGen && !EnablePGOCSInstrUse) - return; - } else if (!EnablePGOInstrGen && PGOInstrUse.empty() && PGOSampleUse.empty()) - return; - - // Perform the preinline and cleanup passes for O1 and above. - // And avoid doing them if optimizing for size. - // We will not do this inline for context sensitive PGO (when IsCS is true). - if (OptLevel > 0 && SizeLevel == 0 && !DisablePreInliner && - PGOSampleUse.empty() && !IsCS) { - // Create preinline pass. We construct an InlineParams object and specify - // the threshold here to avoid the command line options of the regular - // inliner to influence pre-inlining. The only fields of InlineParams we - // care about are DefaultThreshold and HintThreshold. - InlineParams IP; - IP.DefaultThreshold = PreInlineThreshold; - // FIXME: The hint threshold has the same value used by the regular inliner. - // This should probably be lowered after performance testing. - IP.HintThreshold = 325; - - MPM.add(createFunctionInliningPass(IP)); - MPM.add(createSROAPass()); - MPM.add(createEarlyCSEPass()); // Catch trivial redundancies - MPM.add(createCFGSimplificationPass()); // Merge & remove BBs - MPM.add(createInstructionCombiningPass()); // Combine silly seq's - addExtensionsToPM(EP_Peephole, MPM); - } - if ((EnablePGOInstrGen && !IsCS) || (EnablePGOCSInstrGen && IsCS)) { - MPM.add(createPGOInstrumentationGenLegacyPass(IsCS)); - // Add the profile lowering pass. - InstrProfOptions Options; - if (!PGOInstrGen.empty()) - Options.InstrProfileOutput = PGOInstrGen; - Options.DoCounterPromotion = true; - Options.UseBFIInPromotion = IsCS; - MPM.add(createLoopRotatePass()); - MPM.add(createInstrProfilingLegacyPass(Options, IsCS)); - } - if (!PGOInstrUse.empty()) - MPM.add(createPGOInstrumentationUseLegacyPass(PGOInstrUse, IsCS)); - // Indirect call promotion that promotes intra-module targets only. - // For ThinLTO this is done earlier due to interactions with globalopt - // for imported functions. We don't run this at -O0. - if (OptLevel > 0 && !IsCS) - MPM.add( - createPGOIndirectCallPromotionLegacyPass(false, !PGOSampleUse.empty())); -} -void PassManagerBuilder::addFunctionSimplificationPasses( - legacy::PassManagerBase &MPM) { - // Start of function pass. - // Break up aggregate allocas, using SSAUpdater. - MPM.add(createSROAPass()); - MPM.add(createEarlyCSEPass(true /* Enable mem-ssa. */)); // Catch trivial redundancies - if (EnableGVNHoist) - MPM.add(createGVNHoistPass()); - if (EnableGVNSink) { - MPM.add(createGVNSinkPass()); - MPM.add(createCFGSimplificationPass()); - } - - // Speculative execution if the target has divergent branches; otherwise nop. - MPM.add(createSpeculativeExecutionIfHasBranchDivergencePass()); - MPM.add(createJumpThreadingPass()); // Thread jumps. - MPM.add(createCorrelatedValuePropagationPass()); // Propagate conditionals - MPM.add(createCFGSimplificationPass()); // Merge & remove BBs - // Combine silly seq's - if (OptLevel > 2) - MPM.add(createAggressiveInstCombinerPass()); - addInstructionCombiningPass(MPM); - if (SizeLevel == 0 && !DisableLibCallsShrinkWrap) - MPM.add(createLibCallsShrinkWrapPass()); - addExtensionsToPM(EP_Peephole, MPM); - - // Optimize memory intrinsic calls based on the profiled size information. - if (SizeLevel == 0) - MPM.add(createPGOMemOPSizeOptLegacyPass()); - - MPM.add(createTailCallEliminationPass()); // Eliminate tail calls - MPM.add(createCFGSimplificationPass()); // Merge & remove BBs - MPM.add(createReassociatePass()); // Reassociate expressions - - // Begin the loop pass pipeline. - if (EnableSimpleLoopUnswitch) { - // The simple loop unswitch pass relies on separate cleanup passes. Schedule - // them first so when we re-process a loop they run before other loop - // passes. - MPM.add(createLoopInstSimplifyPass()); - MPM.add(createLoopSimplifyCFGPass()); - } - // Rotate Loop - disable header duplication at -Oz - MPM.add(createLoopRotatePass(SizeLevel == 2 ? 0 : -1)); - MPM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap)); - if (EnableSimpleLoopUnswitch) - MPM.add(createSimpleLoopUnswitchLegacyPass()); - else - MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3, DivergentTarget)); - // FIXME: We break the loop pass pipeline here in order to do full - // simplify-cfg. Eventually loop-simplifycfg should be enhanced to replace the - // need for this. - MPM.add(createCFGSimplificationPass()); - addInstructionCombiningPass(MPM); - // We resume loop passes creating a second loop pipeline here. - MPM.add(createIndVarSimplifyPass()); // Canonicalize indvars - MPM.add(createLoopIdiomPass()); // Recognize idioms like memset. - addExtensionsToPM(EP_LateLoopOptimizations, MPM); - MPM.add(createLoopDeletionPass()); // Delete dead loops - - if (EnableLoopInterchange) - MPM.add(createLoopInterchangePass()); // Interchange loops - - // Unroll small loops - MPM.add(createSimpleLoopUnrollPass(OptLevel, DisableUnrollLoops, - ForgetAllSCEVInLoopUnroll)); - addExtensionsToPM(EP_LoopOptimizerEnd, MPM); - // This ends the loop pass pipelines. - - if (OptLevel > 1) { - MPM.add(createMergedLoadStoreMotionPass()); // Merge ld/st in diamonds - MPM.add(NewGVN ? createNewGVNPass() - : createGVNPass(DisableGVNLoadPRE)); // Remove redundancies - } - MPM.add(createMemCpyOptPass()); // Remove memcpy / form memset - MPM.add(createSCCPPass()); // Constant prop with SCCP - - // 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). - MPM.add(createBitTrackingDCEPass()); // Delete dead bit computations - - // Run instcombine after redundancy elimination to exploit opportunities - // opened up by them. - addInstructionCombiningPass(MPM); - addExtensionsToPM(EP_Peephole, MPM); - MPM.add(createJumpThreadingPass()); // Thread jumps - MPM.add(createCorrelatedValuePropagationPass()); - MPM.add(createDeadStoreEliminationPass()); // Delete dead stores - MPM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap)); - - addExtensionsToPM(EP_ScalarOptimizerLate, MPM); - - if (RerollLoops) - MPM.add(createLoopRerollPass()); - - MPM.add(createAggressiveDCEPass()); // Delete dead instructions - MPM.add(createCFGSimplificationPass()); // Merge & remove BBs - // Clean up after everything. - addInstructionCombiningPass(MPM); - addExtensionsToPM(EP_Peephole, MPM); - - if (EnableCHR && OptLevel >= 3 && - (!PGOInstrUse.empty() || !PGOSampleUse.empty() || EnablePGOCSInstrGen)) - MPM.add(createControlHeightReductionLegacyPass()); -} - -void PassManagerBuilder::populateModulePassManager( - legacy::PassManagerBase &MPM) { - // Whether this is a default or *LTO pre-link pipeline. The FullLTO post-link - // is handled separately, so just check this is not the ThinLTO post-link. - bool DefaultOrPreLinkPipeline = !PerformThinLTO; - - if (!PGOSampleUse.empty()) { - MPM.add(createPruneEHPass()); - // 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. - if (!(FlattenedProfileUsed && PerformThinLTO)) - MPM.add(createSampleProfileLoaderPass(PGOSampleUse)); - } - - // Allow forcing function attributes as a debugging and tuning aid. - MPM.add(createForceFunctionAttrsLegacyPass()); - - // If all optimizations are disabled, just run the always-inline pass and, - // if enabled, the function merging pass. - if (OptLevel == 0) { - addPGOInstrPasses(MPM); - if (Inliner) { - MPM.add(Inliner); - Inliner = nullptr; - } - - // FIXME: The BarrierNoopPass is a HACK! The inliner pass above implicitly - // creates a CGSCC pass manager, but we don't want to add extensions into - // that pass manager. To prevent this we insert a no-op module pass to reset - // the pass manager to get the same behavior as EP_OptimizerLast in non-O0 - // builds. The function merging pass is - if (MergeFunctions) - MPM.add(createMergeFunctionsPass()); - else if (GlobalExtensionsNotEmpty() || !Extensions.empty()) - MPM.add(createBarrierNoopPass()); - - if (PerformThinLTO) { - // 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.add(createEliminateAvailableExternallyPass()); - MPM.add(createGlobalDCEPass()); - } - - addExtensionsToPM(EP_EnabledOnOptLevel0, MPM); - - if (PrepareForLTO || PrepareForThinLTO) { - MPM.add(createCanonicalizeAliasesPass()); - // Rename anon globals to be able to export them in the summary. - // This has to be done after we add the extensions to the pass manager - // as there could be passes (e.g. Adddress sanitizer) which introduce - // new unnamed globals. - MPM.add(createNameAnonGlobalPass()); - } - return; - } - - // Add LibraryInfo if we have some. - if (LibraryInfo) - MPM.add(new TargetLibraryInfoWrapperPass(*LibraryInfo)); - - addInitialAliasAnalysisPasses(MPM); - - // For ThinLTO there are two passes of indirect call promotion. The - // first is during the compile phase when PerformThinLTO=false and - // intra-module indirect call targets are promoted. The second is during - // the ThinLTO backend when PerformThinLTO=true, when we promote imported - // inter-module indirect calls. For that we perform indirect call promotion - // earlier in the pass pipeline, here before globalopt. Otherwise imported - // available_externally functions look unreferenced and are removed. - if (PerformThinLTO) - MPM.add(createPGOIndirectCallPromotionLegacyPass(/*InLTO = */ true, - !PGOSampleUse.empty())); - - // For SamplePGO in ThinLTO compile phase, we do not want to unroll loops - // as it will change the CFG too much to make the 2nd profile annotation - // in backend more difficult. - bool PrepareForThinLTOUsingPGOSampleProfile = - PrepareForThinLTO && !PGOSampleUse.empty(); - if (PrepareForThinLTOUsingPGOSampleProfile) - DisableUnrollLoops = true; - - // Infer attributes about declarations if possible. - MPM.add(createInferFunctionAttrsLegacyPass()); - - addExtensionsToPM(EP_ModuleOptimizerEarly, MPM); - - if (OptLevel > 2) - MPM.add(createCallSiteSplittingPass()); - - MPM.add(createIPSCCPPass()); // IP SCCP - MPM.add(createCalledValuePropagationPass()); - - // Infer attributes on declarations, call sites, arguments, etc. - MPM.add(createAttributorLegacyPass()); - - MPM.add(createGlobalOptimizerPass()); // Optimize out global vars - // Promote any localized global vars. - MPM.add(createPromoteMemoryToRegisterPass()); - - MPM.add(createDeadArgEliminationPass()); // Dead argument elimination - - addInstructionCombiningPass(MPM); // Clean up after IPCP & DAE - addExtensionsToPM(EP_Peephole, MPM); - MPM.add(createCFGSimplificationPass()); // Clean up after IPCP & DAE - - // For SamplePGO in ThinLTO compile phase, we do not want to do indirect - // call promotion as it will change the CFG too much to make the 2nd - // profile annotation in backend more difficult. - // PGO instrumentation is added during the compile phase for ThinLTO, do - // not run it a second time - if (DefaultOrPreLinkPipeline && !PrepareForThinLTOUsingPGOSampleProfile) - addPGOInstrPasses(MPM); - - // Create profile COMDAT variables. Lld linker wants to see all variables - // before the LTO/ThinLTO link since it needs to resolve symbols/comdats. - if (!PerformThinLTO && EnablePGOCSInstrGen) - MPM.add(createPGOInstrumentationGenCreateVarLegacyPass(PGOInstrGen)); - - // We add a module alias analysis pass here. In part due to bugs in the - // analysis infrastructure this "works" in that the analysis stays alive - // for the entire SCC pass run below. - MPM.add(createGlobalsAAWrapperPass()); - - // Start of CallGraph SCC passes. - MPM.add(createPruneEHPass()); // Remove dead EH info - bool RunInliner = false; - if (Inliner) { - MPM.add(Inliner); - Inliner = nullptr; - RunInliner = true; - } - - MPM.add(createPostOrderFunctionAttrsLegacyPass()); - if (OptLevel > 2) - MPM.add(createArgumentPromotionPass()); // Scalarize uninlined fn args - - addExtensionsToPM(EP_CGSCCOptimizerLate, MPM); - addFunctionSimplificationPasses(MPM); - - // FIXME: This is a HACK! The inliner pass above implicitly creates a CGSCC - // pass manager that we are specifically trying to avoid. To prevent this - // we must insert a no-op module pass to reset the pass manager. - MPM.add(createBarrierNoopPass()); - - if (RunPartialInlining) - MPM.add(createPartialInliningPass()); - - if (OptLevel > 1 && !PrepareForLTO && !PrepareForThinLTO) - // Remove avail extern fns and globals definitions if 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. - MPM.add(createEliminateAvailableExternallyPass()); - - // CSFDO instrumentation and use pass. Don't invoke this for Prepare pass - // for LTO and ThinLTO -- The actual pass will be called after all inlines - // are performed. - // Need to do this after COMDAT variables have been eliminated, - // (i.e. after EliminateAvailableExternallyPass). - if (!(PrepareForLTO || PrepareForThinLTO)) - addPGOInstrPasses(MPM, /* IsCS */ true); - - if (EnableOrderFileInstrumentation) - MPM.add(createInstrOrderFilePass()); - - MPM.add(createReversePostOrderFunctionAttrsPass()); - - // The inliner performs some kind of dead code elimination as it goes, - // but there are cases that are not really caught by it. We might - // at some point consider teaching the inliner about them, but it - // is OK for now to run GlobalOpt + GlobalDCE in tandem as their - // benefits generally outweight the cost, making the whole pipeline - // faster. - if (RunInliner) { - MPM.add(createGlobalOptimizerPass()); - MPM.add(createGlobalDCEPass()); - } - - // If we are planning to perform ThinLTO later, let's not bloat the code with - // unrolling/vectorization/... now. We'll first run the inliner + CGSCC passes - // during ThinLTO and perform the rest of the optimizations afterward. - if (PrepareForThinLTO) { - // Ensure we perform any last passes, but do so before renaming anonymous - // globals in case the passes add any. - addExtensionsToPM(EP_OptimizerLast, MPM); - MPM.add(createCanonicalizeAliasesPass()); - // Rename anon globals to be able to export them in the summary. - MPM.add(createNameAnonGlobalPass()); - return; - } - - if (PerformThinLTO) - // Optimize globals now when performing ThinLTO, this enables more - // optimizations later. - MPM.add(createGlobalOptimizerPass()); - - // Scheduling LoopVersioningLICM when inlining is over, because after that - // we may see more accurate aliasing. Reason to run this late is that too - // early versioning may prevent further inlining due to increase of code - // size. By placing it just after inlining other optimizations which runs - // later might get benefit of no-alias assumption in clone loop. - if (UseLoopVersioningLICM) { - MPM.add(createLoopVersioningLICMPass()); // Do LoopVersioningLICM - MPM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap)); - } - - // We add a fresh GlobalsModRef run at this point. 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. - // - // Note that this relies on a bug in the pass manager which preserves - // a module analysis into a function pass pipeline (and throughout it) so - // long as the first function pass doesn't invalidate the module analysis. - // Thus both Float2Int and LoopRotate have to preserve AliasAnalysis for - // this to work. Fortunately, it is trivial to preserve AliasAnalysis - // (doing nothing preserves it as it is required to be conservatively - // correct in the face of IR changes). - MPM.add(createGlobalsAAWrapperPass()); - - MPM.add(createFloat2IntPass()); - - addExtensionsToPM(EP_VectorizerStart, MPM); - - // Re-rotate loops in all our loop nests. These may have fallout out of - // rotated form due to GVN or other transformations, and the vectorizer relies - // on the rotated form. Disable header duplication at -Oz. - MPM.add(createLoopRotatePass(SizeLevel == 2 ? 0 : -1)); - - // 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. - MPM.add(createLoopDistributePass()); - - MPM.add(createLoopVectorizePass(!LoopsInterleaved, !LoopVectorize)); - - // Eliminate loads by forwarding stores from the previous iteration to loads - // of the current iteration. - MPM.add(createLoopLoadEliminationPass()); - - // FIXME: Because of #pragma vectorize enable, the passes below are always - // inserted in the pipeline, even when the vectorizer doesn't run (ex. when - // on -O1 and no #pragma is found). Would be good to have these two passes - // as function calls, so that we can only pass them when the vectorizer - // changed the code. - addInstructionCombiningPass(MPM); - if (OptLevel > 1 && ExtraVectorizerPasses) { - // At higher optimization levels, try to clean up any runtime overlap and - // alignment checks inserted by the vectorizer. We want to track correllated - // 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. - MPM.add(createEarlyCSEPass()); - MPM.add(createCorrelatedValuePropagationPass()); - addInstructionCombiningPass(MPM); - MPM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap)); - MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3, DivergentTarget)); - MPM.add(createCFGSimplificationPass()); - addInstructionCombiningPass(MPM); - } - - // 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. - MPM.add(createCFGSimplificationPass(1, true, true, false, true)); - - if (SLPVectorize) { - MPM.add(createSLPVectorizerPass()); // Vectorize parallel scalar chains. - if (OptLevel > 1 && ExtraVectorizerPasses) { - MPM.add(createEarlyCSEPass()); - } - } - - addExtensionsToPM(EP_Peephole, MPM); - addInstructionCombiningPass(MPM); - - if (EnableUnrollAndJam && !DisableUnrollLoops) { - // Unroll and Jam. We do this before unroll but need to be in a separate - // loop pass manager in order for the outer loop to be processed by - // unroll and jam before the inner loop is unrolled. - MPM.add(createLoopUnrollAndJamPass(OptLevel)); - } - - // Unroll small loops - MPM.add(createLoopUnrollPass(OptLevel, DisableUnrollLoops, - ForgetAllSCEVInLoopUnroll)); - - if (!DisableUnrollLoops) { - // LoopUnroll may generate some redundency to cleanup. - addInstructionCombiningPass(MPM); - - // Runtime unrolling will introduce runtime check in loop prologue. If the - // unrolled loop is a inner loop, then the prologue will be inside the - // outer loop. LICM pass can help to promote the runtime check out if the - // checked value is loop invariant. - MPM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap)); - } - - MPM.add(createWarnMissedTransformationsPass()); - - // After vectorization and unrolling, assume intrinsics may tell us more - // about pointer alignments. - MPM.add(createAlignmentFromAssumptionsPass()); - - // FIXME: We shouldn't bother with this anymore. - MPM.add(createStripDeadPrototypesPass()); // Get rid of dead prototypes - - // GlobalOpt already deletes dead functions and globals, at -O2 try a - // late pass of GlobalDCE. It is capable of deleting dead cycles. - if (OptLevel > 1) { - MPM.add(createGlobalDCEPass()); // Remove dead fns and globals. - MPM.add(createConstantMergePass()); // Merge dup global constants - } - - // See comment in the new PM for justification of scheduling splitting at - // this stage (\ref buildModuleSimplificationPipeline). - if (EnableHotColdSplit && !(PrepareForLTO || PrepareForThinLTO)) - MPM.add(createHotColdSplittingPass()); - - if (MergeFunctions) - MPM.add(createMergeFunctionsPass()); - - // 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. - MPM.add(createLoopSinkPass()); - // Get rid of LCSSA nodes. - MPM.add(createInstSimplifyLegacyPass()); - - // 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. - MPM.add(createDivRemPairsPass()); - - // LoopSink (and other loop passes since the last simplifyCFG) might have - // resulted in single-entry-single-exit or empty blocks. Clean up the CFG. - MPM.add(createCFGSimplificationPass()); - - addExtensionsToPM(EP_OptimizerLast, MPM); - - if (PrepareForLTO) { - MPM.add(createCanonicalizeAliasesPass()); - // Rename anon globals to be able to handle them in the summary - MPM.add(createNameAnonGlobalPass()); - } -} - -void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) { - // Load sample profile before running the LTO optimization pipeline. - if (!PGOSampleUse.empty()) { - PM.add(createPruneEHPass()); - PM.add(createSampleProfileLoaderPass(PGOSampleUse)); - } - - // Remove unused virtual tables to improve the quality of code generated by - // whole-program devirtualization and bitset lowering. - PM.add(createGlobalDCEPass()); - - // Provide AliasAnalysis services for optimizations. - addInitialAliasAnalysisPasses(PM); - - // Allow forcing function attributes as a debugging and tuning aid. - PM.add(createForceFunctionAttrsLegacyPass()); - - // Infer attributes about declarations if possible. - PM.add(createInferFunctionAttrsLegacyPass()); - - if (OptLevel > 1) { - // Split call-site with more constrained arguments. - PM.add(createCallSiteSplittingPass()); - - // 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. - PM.add( - createPGOIndirectCallPromotionLegacyPass(true, !PGOSampleUse.empty())); - - // 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. - PM.add(createIPSCCPPass()); - - // Attach metadata to indirect call sites indicating the set of functions - // they may target at run-time. This should follow IPSCCP. - PM.add(createCalledValuePropagationPass()); - - // Infer attributes on declarations, call sites, arguments, etc. - PM.add(createAttributorLegacyPass()); - } - - // Infer attributes about definitions. The readnone attribute in particular is - // required for virtual constant propagation. - PM.add(createPostOrderFunctionAttrsLegacyPass()); - PM.add(createReversePostOrderFunctionAttrsPass()); - - // Split globals using inrange annotations on GEP indices. This can help - // improve the quality of generated code when virtual constant propagation or - // control flow integrity are enabled. - PM.add(createGlobalSplitPass()); - - // Apply whole-program devirtualization and virtual constant propagation. - PM.add(createWholeProgramDevirtPass(ExportSummary, nullptr)); - - // That's all we need at opt level 1. - if (OptLevel == 1) - return; - - // Now that we internalized some globals, see if we can hack on them! - PM.add(createGlobalOptimizerPass()); - // Promote any localized global vars. - PM.add(createPromoteMemoryToRegisterPass()); - - // Linking modules together can lead to duplicated global constants, only - // keep one copy of each constant. - PM.add(createConstantMergePass()); - - // Remove unused arguments from functions. - PM.add(createDeadArgEliminationPass()); - - // 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. - if (OptLevel > 2) - PM.add(createAggressiveInstCombinerPass()); - addInstructionCombiningPass(PM); - addExtensionsToPM(EP_Peephole, PM); - - // Inline small functions - bool RunInliner = Inliner; - if (RunInliner) { - PM.add(Inliner); - Inliner = nullptr; - } - - PM.add(createPruneEHPass()); // Remove dead EH info. - - // CSFDO instrumentation and use pass. - addPGOInstrPasses(PM, /* IsCS */ true); - - // Optimize globals again if we ran the inliner. - if (RunInliner) - PM.add(createGlobalOptimizerPass()); - PM.add(createGlobalDCEPass()); // Remove dead functions. - - // 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. - PM.add(createArgumentPromotionPass()); - - // The IPO passes may leave cruft around. Clean up after them. - addInstructionCombiningPass(PM); - addExtensionsToPM(EP_Peephole, PM); - PM.add(createJumpThreadingPass()); - - // Break up allocas - PM.add(createSROAPass()); - - // LTO provides additional opportunities for tailcall elimination due to - // link-time inlining, and visibility of nocapture attribute. - PM.add(createTailCallEliminationPass()); - - // Infer attributes on declarations, call sites, arguments, etc. - PM.add(createPostOrderFunctionAttrsLegacyPass()); // Add nocapture. - // Run a few AA driven optimizations here and now, to cleanup the code. - PM.add(createGlobalsAAWrapperPass()); // IP alias analysis. - - PM.add(createLICMPass(LicmMssaOptCap, LicmMssaNoAccForPromotionCap)); - PM.add(createMergedLoadStoreMotionPass()); // Merge ld/st in diamonds. - PM.add(NewGVN ? createNewGVNPass() - : createGVNPass(DisableGVNLoadPRE)); // Remove redundancies. - PM.add(createMemCpyOptPass()); // Remove dead memcpys. - - // Nuke dead stores. - PM.add(createDeadStoreEliminationPass()); - - // More loops are countable; try to optimize them. - PM.add(createIndVarSimplifyPass()); - PM.add(createLoopDeletionPass()); - if (EnableLoopInterchange) - PM.add(createLoopInterchangePass()); - - // Unroll small loops - PM.add(createSimpleLoopUnrollPass(OptLevel, DisableUnrollLoops, - ForgetAllSCEVInLoopUnroll)); - PM.add(createLoopVectorizePass(true, !LoopVectorize)); - // The vectorizer may have significantly shortened a loop body; unroll again. - PM.add(createLoopUnrollPass(OptLevel, DisableUnrollLoops, - ForgetAllSCEVInLoopUnroll)); - - PM.add(createWarnMissedTransformationsPass()); - - // Now that we've optimized loops (in particular loop induction variables), - // we may have exposed more scalar opportunities. Run parts of the scalar - // optimizer again at this point. - addInstructionCombiningPass(PM); // Initial cleanup - PM.add(createCFGSimplificationPass()); // if-convert - PM.add(createSCCPPass()); // Propagate exposed constants - addInstructionCombiningPass(PM); // Clean up again - PM.add(createBitTrackingDCEPass()); - - // More scalar chains could be vectorized due to more alias information - if (SLPVectorize) - PM.add(createSLPVectorizerPass()); // Vectorize parallel scalar chains. - - // After vectorization, assume intrinsics may tell us more about pointer - // alignments. - PM.add(createAlignmentFromAssumptionsPass()); - - // Cleanup and simplify the code after the scalar optimizations. - addInstructionCombiningPass(PM); - addExtensionsToPM(EP_Peephole, PM); - - PM.add(createJumpThreadingPass()); -} - -void PassManagerBuilder::addLateLTOOptimizationPasses( - legacy::PassManagerBase &PM) { - // See comment in the new PM for justification of scheduling splitting at - // this stage (\ref buildLTODefaultPipeline). - if (EnableHotColdSplit) - PM.add(createHotColdSplittingPass()); - - // Delete basic blocks, which optimization passes may have killed. - PM.add(createCFGSimplificationPass()); - - // Drop bodies of available externally objects to improve GlobalDCE. - PM.add(createEliminateAvailableExternallyPass()); - - // Now that we have optimized the program, discard unreachable functions. - PM.add(createGlobalDCEPass()); - - // FIXME: this is profitable (for compiler time) to do at -O0 too, but - // currently it damages debug info. - if (MergeFunctions) - PM.add(createMergeFunctionsPass()); -} - -void PassManagerBuilder::populateThinLTOPassManager( - legacy::PassManagerBase &PM) { - PerformThinLTO = true; - if (LibraryInfo) - PM.add(new TargetLibraryInfoWrapperPass(*LibraryInfo)); - - if (VerifyInput) - PM.add(createVerifierPass()); - - 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. - PM.add(createWholeProgramDevirtPass(nullptr, ImportSummary)); - PM.add(createLowerTypeTestsPass(nullptr, ImportSummary)); - } - - populateModulePassManager(PM); - - if (VerifyOutput) - PM.add(createVerifierPass()); - PerformThinLTO = false; -} - -void PassManagerBuilder::populateLTOPassManager(legacy::PassManagerBase &PM) { - if (LibraryInfo) - PM.add(new TargetLibraryInfoWrapperPass(*LibraryInfo)); - - if (VerifyInput) - PM.add(createVerifierPass()); - - addExtensionsToPM(EP_FullLinkTimeOptimizationEarly, PM); - - if (OptLevel != 0) - addLTOOptimizationPasses(PM); - else { - // The whole-program-devirt pass needs to run at -O0 because only it knows - // about the llvm.type.checked.load intrinsic: it needs to both lower the - // intrinsic itself and handle it in the summary. - PM.add(createWholeProgramDevirtPass(ExportSummary, nullptr)); - } - - // Create a function that performs CFI checks for cross-DSO calls with targets - // in the current module. - PM.add(createCrossDSOCFIPass()); - - // Lower type metadata and the type.test intrinsic. This pass supports Clang's - // control flow integrity mechanisms (-fsanitize=cfi*) and needs to run at - // link time if CFI is enabled. The pass does nothing if CFI is disabled. - PM.add(createLowerTypeTestsPass(ExportSummary, nullptr)); - - if (OptLevel != 0) - addLateLTOOptimizationPasses(PM); - - addExtensionsToPM(EP_FullLinkTimeOptimizationLast, PM); - - if (VerifyOutput) - PM.add(createVerifierPass()); -} - -inline PassManagerBuilder *unwrap(LLVMPassManagerBuilderRef P) { - return reinterpret_cast<PassManagerBuilder*>(P); -} - -inline LLVMPassManagerBuilderRef wrap(PassManagerBuilder *P) { - return reinterpret_cast<LLVMPassManagerBuilderRef>(P); -} - -LLVMPassManagerBuilderRef LLVMPassManagerBuilderCreate() { - PassManagerBuilder *PMB = new PassManagerBuilder(); - return wrap(PMB); -} - -void LLVMPassManagerBuilderDispose(LLVMPassManagerBuilderRef PMB) { - PassManagerBuilder *Builder = unwrap(PMB); - delete Builder; -} - -void -LLVMPassManagerBuilderSetOptLevel(LLVMPassManagerBuilderRef PMB, - unsigned OptLevel) { - PassManagerBuilder *Builder = unwrap(PMB); - Builder->OptLevel = OptLevel; -} - -void -LLVMPassManagerBuilderSetSizeLevel(LLVMPassManagerBuilderRef PMB, - unsigned SizeLevel) { - PassManagerBuilder *Builder = unwrap(PMB); - Builder->SizeLevel = SizeLevel; -} - -void -LLVMPassManagerBuilderSetDisableUnitAtATime(LLVMPassManagerBuilderRef PMB, - LLVMBool Value) { - // NOTE: The DisableUnitAtATime switch has been removed. -} - -void -LLVMPassManagerBuilderSetDisableUnrollLoops(LLVMPassManagerBuilderRef PMB, - LLVMBool Value) { - PassManagerBuilder *Builder = unwrap(PMB); - Builder->DisableUnrollLoops = Value; -} - -void -LLVMPassManagerBuilderSetDisableSimplifyLibCalls(LLVMPassManagerBuilderRef PMB, - LLVMBool Value) { - // NOTE: The simplify-libcalls pass has been removed. -} - -void -LLVMPassManagerBuilderUseInlinerWithThreshold(LLVMPassManagerBuilderRef PMB, - unsigned Threshold) { - PassManagerBuilder *Builder = unwrap(PMB); - Builder->Inliner = createFunctionInliningPass(Threshold); -} - -void -LLVMPassManagerBuilderPopulateFunctionPassManager(LLVMPassManagerBuilderRef PMB, - LLVMPassManagerRef PM) { - PassManagerBuilder *Builder = unwrap(PMB); - legacy::FunctionPassManager *FPM = unwrap<legacy::FunctionPassManager>(PM); - Builder->populateFunctionPassManager(*FPM); -} - -void -LLVMPassManagerBuilderPopulateModulePassManager(LLVMPassManagerBuilderRef PMB, - LLVMPassManagerRef PM) { - PassManagerBuilder *Builder = unwrap(PMB); - legacy::PassManagerBase *MPM = unwrap(PM); - Builder->populateModulePassManager(*MPM); -} - -void LLVMPassManagerBuilderPopulateLTOPassManager(LLVMPassManagerBuilderRef PMB, - LLVMPassManagerRef PM, - LLVMBool Internalize, - LLVMBool RunInliner) { - PassManagerBuilder *Builder = unwrap(PMB); - legacy::PassManagerBase *LPM = unwrap(PM); - - // A small backwards compatibility hack. populateLTOPassManager used to take - // an RunInliner option. - if (RunInliner && !Builder->Inliner) - Builder->Inliner = createFunctionInliningPass(); - - Builder->populateLTOPassManager(*LPM); -} |