//===- Parsing, selection, and construction of pass pipelines -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
/// \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/AliasAnalysis.h"
#include "llvm/Analysis/AliasAnalysisEvaluator.h"
#include "llvm/Analysis/AssumptionCache.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/DemandedBits.h"
#include "llvm/Analysis/DependenceAnalysis.h"
#include "llvm/Analysis/DominanceFrontier.h"
#include "llvm/Analysis/GlobalsModRef.h"
#include "llvm/Analysis/IVUsers.h"
#include "llvm/Analysis/LazyCallGraph.h"
#include "llvm/Analysis/LazyValueInfo.h"
#include "llvm/Analysis/LoopAccessAnalysis.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/MemoryDependenceAnalysis.h"
#include "llvm/Analysis/MemorySSA.h"
#include "llvm/Analysis/ModuleSummaryAnalysis.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/TargetLibraryInfo.h"
#include "llvm/Analysis/TargetTransformInfo.h"
#include "llvm/Analysis/TypeBasedAliasAnalysis.h"
#include "llvm/CodeGen/PreISelIntrinsicLowering.h"
#include "llvm/CodeGen/UnreachableBlockElim.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/IRPrintingPasses.h"
#include "llvm/IR/PassManager.h"
#include "llvm/IR/Verifier.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/Regex.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Transforms/AggressiveInstCombine/AggressiveInstCombine.h"
#include "llvm/Transforms/Instrumentation/CGProfile.h"
#include "llvm/Transforms/IPO/AlwaysInliner.h"
#include "llvm/Transforms/IPO/ArgumentPromotion.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/InferFunctionAttrs.h"
#include "llvm/Transforms/IPO/Inliner.h"
#include "llvm/Transforms/IPO/Internalize.h"
#include "llvm/Transforms/IPO/LowerTypeTests.h"
#include "llvm/Transforms/IPO/PartialInlining.h"
#include "llvm/Transforms/IPO/SCCP.h"
#include "llvm/Transforms/IPO/SampleProfile.h"
#include "llvm/Transforms/IPO/StripDeadPrototypes.h"
#include "llvm/Transforms/IPO/SyntheticCountsPropagation.h"
#include "llvm/Transforms/IPO/WholeProgramDevirt.h"
#include "llvm/Transforms/InstCombine/InstCombine.h"
#include "llvm/Transforms/Instrumentation/BoundsChecking.h"
#include "llvm/Transforms/Instrumentation/GCOVProfiler.h"
#include "llvm/Transforms/Instrumentation/InstrProfiling.h"
#include "llvm/Transforms/Instrumentation/PGOInstrumentation.h"
#include "llvm/Transforms/Scalar/ADCE.h"
#include "llvm/Transforms/Scalar/AlignmentFromAssumptions.h"
#include "llvm/Transforms/Scalar/BDCE.h"
#include "llvm/Transforms/Scalar/CallSiteSplitting.h"
#include "llvm/Transforms/Scalar/ConstantHoisting.h"
#include "llvm/Transforms/Scalar/CorrelatedValuePropagation.h"
#include "llvm/Transforms/Scalar/DCE.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/InstSimplifyPass.h"
#include "llvm/Transforms/Scalar/JumpThreading.h"
#include "llvm/Transforms/Scalar/LICM.h"
#include "llvm/Transforms/Scalar/LoopAccessAnalysisPrinter.h"
#include "llvm/Transforms/Scalar/LoopDataPrefetch.h"
#include "llvm/Transforms/Scalar/LoopDeletion.h"
#include "llvm/Transforms/Scalar/LoopDistribute.h"
#include "llvm/Transforms/Scalar/LoopIdiomRecognize.h"
#include "llvm/Transforms/Scalar/LoopInstSimplify.h"
#include "llvm/Transforms/Scalar/LoopLoadElimination.h"
#include "llvm/Transforms/Scalar/LoopPassManager.h"
#include "llvm/Transforms/Scalar/LoopPredication.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/LowerAtomic.h"
#include "llvm/Transforms/Scalar/LowerExpectIntrinsic.h"
#include "llvm/Transforms/Scalar/LowerGuardIntrinsic.h"
#include "llvm/Transforms/Scalar/MemCpyOptimizer.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/RewriteStatepointsForGC.h"
#include "llvm/Transforms/Scalar/SCCP.h"
#include "llvm/Transforms/Scalar/SROA.h"
#include "llvm/Transforms/Scalar/SimpleLoopUnswitch.h"
#include "llvm/Transforms/Scalar/SimplifyCFG.h"
#include "llvm/Transforms/Scalar/Sink.h"
#include "llvm/Transforms/Scalar/SpeculateAroundPHIs.h"
#include "llvm/Transforms/Scalar/SpeculativeExecution.h"
#include "llvm/Transforms/Scalar/TailRecursionElimination.h"
#include "llvm/Transforms/Utils/AddDiscriminators.h"
#include "llvm/Transforms/Utils/BreakCriticalEdges.h"
#include "llvm/Transforms/Utils/EntryExitInstrumenter.h"
#include "llvm/Transforms/Utils/LCSSA.h"
#include "llvm/Transforms/Utils/LibCallsShrinkWrap.h"
#include "llvm/Transforms/Utils/LoopSimplify.h"
#include "llvm/Transforms/Utils/LowerInvoke.h"
#include "llvm/Transforms/Utils/Mem2Reg.h"
#include "llvm/Transforms/Utils/NameAnonGlobals.h"
#include "llvm/Transforms/Utils/SymbolRewriter.h"
#include "llvm/Transforms/Vectorize/LoopVectorize.h"
#include "llvm/Transforms/Vectorize/SLPVectorizer.h"
using namespace llvm;
static cl::opt<unsigned> MaxDevirtIterations("pm-max-devirt-iterations",
cl::ReallyHidden, cl::init(4));
static cl::opt<bool>
RunPartialInlining("enable-npm-partial-inlining", cl::init(false),
cl::Hidden, cl::ZeroOrMore,
cl::desc("Run Partial inlinining pass"));
static cl::opt<bool>
RunNewGVN("enable-npm-newgvn", cl::init(false),
cl::Hidden, cl::ZeroOrMore,
cl::desc("Run NewGVN instead of GVN"));
static cl::opt<bool> EnableEarlyCSEMemSSA(
"enable-npm-earlycse-memssa", cl::init(true), cl::Hidden,
cl::desc("Enable the EarlyCSE w/ MemorySSA pass for the new PM (default = on)"));
static cl::opt<bool> EnableGVNHoist(
"enable-npm-gvn-hoist", cl::init(false), cl::Hidden,
cl::desc("Enable the GVN hoisting pass for the new PM (default = off)"));
static cl::opt<bool> EnableGVNSink(
"enable-npm-gvn-sink", cl::init(false), cl::Hidden,
cl::desc("Enable the GVN hoisting pass for the new PM (default = off)"));
static cl::opt<bool> EnableUnrollAndJam(
"enable-npm-unroll-and-jam", cl::init(false), cl::Hidden,
cl::desc("Enable the Unroll and Jam pass for the new PM (default = off)"));
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 Regex DefaultAliasRegex(
"^(default|thinlto-pre-link|thinlto|lto-pre-link|lto)<(O[0123sz])>$");
static bool isOptimizingForSize(PassBuilder::OptimizationLevel Level) {
switch (Level) {
case PassBuilder::O0:
case PassBuilder::O1:
case PassBuilder::O2:
case PassBuilder::O3:
return false;
case PassBuilder::Os:
case PassBuilder::Oz:
return true;
}
llvm_unreachable("Invalid optimization level!");
}
namespace {
/// No-op module pass which does nothing.
struct 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 {
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 {
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 {
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;
} // End anonymous namespace.
void PassBuilder::invokePeepholeEPCallbacks(
FunctionPassManager &FPM, PassBuilder::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);
}
FunctionPassManager
PassBuilder::buildFunctionSimplificationPipeline(OptimizationLevel Level,
ThinLTOPhase Phase,
bool DebugLogging) {
assert(Level != O0 && "Must request optimizations!");
FunctionPassManager FPM(DebugLogging);
// Form SSA out of local memory accesses after breaking apart aggregates into
// scalars.
FPM.addPass(SROA());
// Catch trivial redundancies
FPM.addPass(EarlyCSEPass(EnableEarlyCSEMemSSA));
// Hoisting of scalars and load expressions.
if (EnableGVNHoist)
FPM.addPass(GVNHoistPass());
// Global value numbering based sinking.
if (EnableGVNSink) {
FPM.addPass(GVNSinkPass());
FPM.addPass(SimplifyCFGPass());
}
// Speculative execution if the target has divergent branches; otherwise nop.
FPM.addPass(SpeculativeExecutionPass());
// Optimize based on known information about branches, and cleanup afterward.
FPM.addPass(JumpThreadingPass());
FPM.addPass(CorrelatedValuePropagationPass());
FPM.addPass(SimplifyCFGPass());
if (Level == O3)
FPM.addPass(AggressiveInstCombinePass());
FPM.addPass(InstCombinePass());
if (!isOptimizingForSize(Level))
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->ProfileUseFile.empty() &&
!isOptimizingForSize(Level))
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(DebugLogging), LPM2(DebugLogging);
// 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());
// Rotate Loop - disable header duplication at -Oz
LPM1.addPass(LoopRotatePass(Level != Oz));
LPM1.addPass(LICMPass());
LPM1.addPass(SimpleLoopUnswitchPass());
LPM2.addPass(IndVarSimplifyPass());
LPM2.addPass(LoopIdiomRecognizePass());
for (auto &C : LateLoopOptimizationsEPCallbacks)
C(LPM2, Level);
LPM2.addPass(LoopDeletionPass());
// Do not enable unrolling in PreLinkThinLTO phase during sample PGO
// because it changes IR to makes profile annotation in back compile
// inaccurate.
if (Phase != ThinLTOPhase::PreLink ||
!PGOOpt || PGOOpt->SampleProfileFile.empty())
LPM2.addPass(LoopFullUnrollPass(Level));
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), DebugLogging));
FPM.addPass(SimplifyCFGPass());
FPM.addPass(InstCombinePass());
FPM.addPass(createFunctionToLoopPassAdaptor(std::move(LPM2), DebugLogging));
// Eliminate redundancies.
if (Level != O1) {
// These passes add substantial compile time so skip them at O1.
FPM.addPass(MergedLoadStoreMotionPass());
if (RunNewGVN)
FPM.addPass(NewGVNPass());
else
FPM.addPass(GVN());
}
// 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);
// Re-consider control flow based optimizations after redundancy elimination,
// redo DCE, etc.
FPM.addPass(JumpThreadingPass());
FPM.addPass(CorrelatedValuePropagationPass());
FPM.addPass(DSEPass());
FPM.addPass(createFunctionToLoopPassAdaptor(LICMPass(), DebugLogging));
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.
FPM.addPass(ADCEPass());
FPM.addPass(SimplifyCFGPass());
FPM.addPass(InstCombinePass());
invokePeepholeEPCallbacks(FPM, Level);
return FPM;
}
void PassBuilder::addPGOInstrPasses(ModulePassManager &MPM, bool DebugLogging,
PassBuilder::OptimizationLevel Level,
bool RunProfileGen,
std::string ProfileGenFile,
std::string ProfileUseFile) {
// Generally running simplification passes and the inliner with an high
// threshold results in smaller executables, but there may be cases where
// the size grows, so let's be conservative here and skip this simplification
// at -Os/Oz.
if (!isOptimizingForSize(Level)) {
InlineParams IP;
// In the old pass manager, this is a cl::opt. Should still this be one?
IP.DefaultThreshold = 75;
// FIXME: The hint threshold has the same value used by the regular inliner.
// This should probably be lowered after performance testing.
// FIXME: this comment is cargo culted from the old pass manager, revisit).
IP.HintThreshold = 325;
CGSCCPassManager CGPipeline(DebugLogging);
CGPipeline.addPass(InlinerPass(IP));
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(createModuleToPostOrderCGSCCPassAdaptor(std::move(CGPipeline)));
}
// 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) {
MPM.addPass(PGOInstrumentationGen());
FunctionPassManager FPM;
FPM.addPass(
createFunctionToLoopPassAdaptor(LoopRotatePass(), DebugLogging));
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
// Add the profile lowering pass.
InstrProfOptions Options;
if (!ProfileGenFile.empty())
Options.InstrProfileOutput = ProfileGenFile;
Options.DoCounterPromotion = true;
MPM.addPass(InstrProfiling(Options));
}
if (!ProfileUseFile.empty())
MPM.addPass(PGOInstrumentationUse(ProfileUseFile));
}
static InlineParams
getInlineParamsFromOptLevel(PassBuilder::OptimizationLevel Level) {
auto O3 = PassBuilder::O3;
unsigned OptLevel = Level > O3 ? 2 : Level;
unsigned SizeLevel = Level > O3 ? Level - O3 : 0;
return getInlineParams(OptLevel, SizeLevel);
}
ModulePassManager
PassBuilder::buildModuleSimplificationPipeline(OptimizationLevel Level,
ThinLTOPhase Phase,
bool DebugLogging) {
ModulePassManager MPM(DebugLogging);
// 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(DebugLogging);
EarlyFPM.addPass(SimplifyCFGPass());
EarlyFPM.addPass(SROA());
EarlyFPM.addPass(EarlyCSEPass());
EarlyFPM.addPass(LowerExpectIntrinsicPass());
if (Level == 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 (PGOOpt && !PGOOpt->SampleProfileFile.empty() &&
Phase == ThinLTOPhase::PostLink)
EarlyFPM.addPass(InstCombinePass());
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(EarlyFPM)));
if (PGOOpt && !PGOOpt->SampleProfileFile.empty()) {
// Annotate sample profile right after early FPM to ensure freshness of
// the debug info.
MPM.addPass(SampleProfileLoaderPass(PGOOpt->SampleProfileFile,
Phase == ThinLTOPhase::PreLink));
// Do not invoke ICP in the ThinLTOPrelink phase as it makes it hard
// for the profile annotation to be accurate in the ThinLTO backend.
if (Phase != ThinLTOPhase::PreLink)
// 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(Phase == ThinLTOPhase::PostLink,
true));
}
// 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 simplify-cfg 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 constand folding
// globals.
MPM.addPass(DeadArgumentEliminationPass());
// Create a small function pass pipeline to cleanup after all the global
// optimizations.
FunctionPassManager GlobalCleanupPM(DebugLogging);
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 != ThinLTOPhase::PostLink &&
(!PGOOpt->ProfileGenFile.empty() || !PGOOpt->ProfileUseFile.empty())) {
addPGOInstrPasses(MPM, DebugLogging, Level, PGOOpt->RunProfileGen,
PGOOpt->ProfileGenFile, PGOOpt->ProfileUseFile);
MPM.addPass(PGOIndirectCallPromotion(false, false));
}
// Synthesize function entry counts for non-PGO compilation.
if (EnableSyntheticCounts && !PGOOpt)
MPM.addPass(SyntheticCountsPropagation());
// Require the GlobalsAA analysis for the module so we can query it within
// the CGSCC pipeline.
MPM.addPass(RequireAnalysisPass<GlobalsAA, Module>());
// Require the ProfileSummaryAnalysis for the module so we can query it within
// the inliner pass.
MPM.addPass(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(DebugLogging);
// 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 first. The theory is that we are walking bottom-up and so
// the callees have already been fully optimized, and we want to inline them
// into the callers so that our optimizations can reflect that.
// For PreLinkThinLTO pass, we disable hot-caller heuristic for sample PGO
// because it makes profile annotation in the backend inaccurate.
InlineParams IP = getInlineParamsFromOptLevel(Level);
if (Phase == ThinLTOPhase::PreLink &&
PGOOpt && !PGOOpt->SampleProfileFile.empty())
IP.HotCallSiteThreshold = 0;
MainCGPipeline.addPass(InlinerPass(IP));
// 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 == O3)
MainCGPipeline.addPass(ArgumentPromotionPass());
// Lastly, add the core function simplification pipeline nested inside the
// CGSCC walk.
MainCGPipeline.addPass(createCGSCCToFunctionPassAdaptor(
buildFunctionSimplificationPipeline(Level, Phase, DebugLogging)));
for (auto &C : CGSCCOptimizerLateEPCallbacks)
C(MainCGPipeline, Level);
// We wrap the CGSCC pipeline in a devirtualization repeater. This will try
// to detect when we devirtualize indirect calls and iterate the SCC passes
// in that case to try and catch knock-on inlining or function attrs
// opportunities. Then we add it to the module pipeline by walking the SCCs
// in postorder (or bottom-up).
MPM.addPass(
createModuleToPostOrderCGSCCPassAdaptor(createDevirtSCCRepeatedPass(
std::move(MainCGPipeline), MaxDevirtIterations)));
return MPM;
}
ModulePassManager
PassBuilder::buildModuleOptimizationPipeline(OptimizationLevel Level,
bool DebugLogging) {
ModulePassManager MPM(DebugLogging);
// 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.
MPM.addPass(EliminateAvailableExternallyPass());
// 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());
// 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(DebugLogging);
OptimizePM.addPass(Float2IntPass());
// FIXME: We need to run some loop optimizations to re-rotate loops after
// simplify-cfg 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.
OptimizePM.addPass(
createFunctionToLoopPassAdaptor(LoopRotatePass(), DebugLogging));
// 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());
// Now run the core loop vectorizer.
OptimizePM.addPass(LoopVectorizePass());
// Eliminate loads by forwarding stores from the previous iteration to loads
// of the current iteration.
OptimizePM.addPass(LoopLoadEliminationPass());
// Cleanup after the loop optimization passes.
OptimizePM.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.
OptimizePM.addPass(SimplifyCFGPass(SimplifyCFGOptions().
forwardSwitchCondToPhi(true).
convertSwitchToLookupTable(true).
needCanonicalLoops(false).
sinkCommonInsts(true)));
// Optimize parallel scalar instruction chains into SIMD instructions.
OptimizePM.addPass(SLPVectorizerPass());
OptimizePM.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) {
OptimizePM.addPass(
createFunctionToLoopPassAdaptor(LoopUnrollAndJamPass(Level)));
}
OptimizePM.addPass(LoopUnrollPass(Level));
OptimizePM.addPass(InstCombinePass());
OptimizePM.addPass(RequireAnalysisPass<OptimizationRemarkEmitterAnalysis, Function>());
OptimizePM.addPass(createFunctionToLoopPassAdaptor(LICMPass(), DebugLogging));
// Now that we've vectorized and unrolled loops, we may have more refined
// alignment information, try to re-derive it here.
OptimizePM.addPass(AlignmentFromAssumptionsPass());
// 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());
// Optimize PHIs by speculating around them when profitable. Note that this
// pass needs to be run after any PRE or similar pass as it is essentially
// inserting redudnancies into the progrem. This even includes SimplifyCFG.
OptimizePM.addPass(SpeculateAroundPHIsPass());
// Add the core optimizing pipeline.
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(OptimizePM)));
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());
return MPM;
}
ModulePassManager
PassBuilder::buildPerModuleDefaultPipeline(OptimizationLevel Level,
bool DebugLogging) {
assert(Level != O0 && "Must request optimizations for the default pipeline!");
ModulePassManager MPM(DebugLogging);
// 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);
if (PGOOpt && PGOOpt->SamplePGOSupport)
MPM.addPass(createModuleToFunctionPassAdaptor(AddDiscriminatorsPass()));
// Add the core simplification pipeline.
MPM.addPass(buildModuleSimplificationPipeline(Level, ThinLTOPhase::None,
DebugLogging));
// Now add the optimization pipeline.
MPM.addPass(buildModuleOptimizationPipeline(Level, DebugLogging));
return MPM;
}
ModulePassManager
PassBuilder::buildThinLTOPreLinkDefaultPipeline(OptimizationLevel Level,
bool DebugLogging) {
assert(Level != O0 && "Must request optimizations for the default pipeline!");
ModulePassManager MPM(DebugLogging);
// Force any function attributes we want the rest of the pipeline to observe.
MPM.addPass(ForceFunctionAttrsPass());
if (PGOOpt && PGOOpt->SamplePGOSupport)
MPM.addPass(createModuleToFunctionPassAdaptor(AddDiscriminatorsPass()));
// Apply module pipeline start EP callback.
for (auto &C : PipelineStartEPCallbacks)
C(MPM);
// 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, ThinLTOPhase::PreLink,
DebugLogging));
// 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());
return MPM;
}
ModulePassManager PassBuilder::buildThinLTODefaultPipeline(
OptimizationLevel Level, bool DebugLogging,
const ModuleSummaryIndex *ImportSummary) {
ModulePassManager MPM(DebugLogging);
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.
MPM.addPass(WholeProgramDevirtPass(nullptr, ImportSummary));
MPM.addPass(LowerTypeTestsPass(nullptr, ImportSummary));
}
// Force any function attributes we want the rest of the pipeline to observe.
MPM.addPass(ForceFunctionAttrsPass());
// During the ThinLTO backend phase we perform early indirect call promotion
// here, before globalopt. Otherwise imported available_externally functions
// look unreferenced and are removed.
// FIXME: move this into buildModuleSimplificationPipeline to merge the logic
// with SamplePGO.
if (!PGOOpt || PGOOpt->SampleProfileFile.empty())
MPM.addPass(PGOIndirectCallPromotion(true /* InLTO */,
false /* SamplePGO */));
// Add the core simplification pipeline.
MPM.addPass(buildModuleSimplificationPipeline(Level, ThinLTOPhase::PostLink,
DebugLogging));
// Now add the optimization pipeline.
MPM.addPass(buildModuleOptimizationPipeline(Level, DebugLogging));
return MPM;
}
ModulePassManager
PassBuilder::buildLTOPreLinkDefaultPipeline(OptimizationLevel Level,
bool DebugLogging) {
assert(Level != O0 && "Must request optimizations for the default pipeline!");
// FIXME: We should use a customized pre-link pipeline!
return buildPerModuleDefaultPipeline(Level, DebugLogging);
}
ModulePassManager
PassBuilder::buildLTODefaultPipeline(OptimizationLevel Level, bool DebugLogging,
ModuleSummaryIndex *ExportSummary) {
assert(Level != O0 && "Must request optimizations for the default pipeline!");
ModulePassManager MPM(DebugLogging);
// 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 > 1) {
FunctionPassManager EarlyFPM(DebugLogging);
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->SampleProfileFile.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.
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 inragne 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 == 1) {
// 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));
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(DebugLogging);
if (Level == 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(createModuleToPostOrderCGSCCPassAdaptor(
InlinerPass(getInlineParamsFromOptLevel(Level))));
// Optimize globals again after we ran the inliner.
MPM.addPass(GlobalOptPass());
// Garbage collect dead functions.
// FIXME: Add ArgumentPromotion pass after once it's ported.
MPM.addPass(GlobalDCEPass());
FunctionPassManager FPM(DebugLogging);
// The IPO Passes may leave cruft around. Clean up after them.
FPM.addPass(InstCombinePass());
invokePeepholeEPCallbacks(FPM, Level);
FPM.addPass(JumpThreadingPass());
// Break up allocas
FPM.addPass(SROA());
// Run a few AA driver optimizations here and now to cleanup the code.
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(
PostOrderFunctionAttrsPass()));
// FIXME: here we run IP alias analysis in the legacy PM.
FunctionPassManager MainFPM;
// FIXME: once we fix LoopPass Manager, add LICM here.
// FIXME: once we provide support for enabling MLSM, add it here.
// FIXME: once we provide support for enabling NewGVN, add it here.
if (RunNewGVN)
MainFPM.addPass(NewGVNPass());
else
MainFPM.addPass(GVN());
// Remove dead memcpy()'s.
MainFPM.addPass(MemCpyOptPass());
// Nuke dead stores.
MainFPM.addPass(DSEPass());
// FIXME: at this point, we run a bunch of loop passes:
// indVarSimplify, loopDeletion, loopInterchange, loopUnrool,
// loopVectorize. Enable them once the remaining issue with LPM
// are sorted out.
MainFPM.addPass(InstCombinePass());
MainFPM.addPass(SimplifyCFGPass());
MainFPM.addPass(SCCPPass());
MainFPM.addPass(InstCombinePass());
MainFPM.addPass(BDCEPass());
// FIXME: We may want to run SLPVectorizer here.
// After vectorization, assume intrinsics may tell us more
// about pointer alignments.
#if 0
MainFPM.add(AlignmentFromAssumptionsPass());
#endif
// FIXME: Conditionally run LoadCombine here, after it's ported
// (in case we still have this pass, given its questionable usefulness).
MainFPM.addPass(InstCombinePass());
invokePeepholeEPCallbacks(MainFPM, Level);
MainFPM.addPass(JumpThreadingPass());
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(MainFPM)));
// Create a function that performs CFI checks for cross-DSO calls with
// targets in the current module.
MPM.addPass(CrossDSOCFIPass());
// 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));
// Add late LTO optimization passes.
// Delete basic blocks, which optimization passes may have killed.
MPM.addPass(createModuleToFunctionPassAdaptor(SimplifyCFGPass()));
// 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());
// FIXME: Enable MergeFuncs, conditionally, after ported, maybe.
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>();
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;
}
/// 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_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")
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_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) {
// Explicitly handle pass manager names.
if (Name == "loop")
return true;
// Explicitly handle custom-parsed pass names.
if (parseRepeatPassName(Name))
return true;
#define LOOP_PASS(NAME, CREATE_PASS) \
if (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)};
}
bool PassBuilder::parseModulePass(ModulePassManager &MPM,
const PipelineElement &E, bool VerifyEachPass,
bool DebugLogging) {
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(DebugLogging);
if (!parseModulePassPipeline(NestedMPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
MPM.addPass(std::move(NestedMPM));
return true;
}
if (Name == "cgscc") {
CGSCCPassManager CGPM(DebugLogging);
if (!parseCGSCCPassPipeline(CGPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
MPM.addPass(createModuleToPostOrderCGSCCPassAdaptor(std::move(CGPM)));
return true;
}
if (Name == "function") {
FunctionPassManager FPM(DebugLogging);
if (!parseFunctionPassPipeline(FPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
return true;
}
if (auto Count = parseRepeatPassName(Name)) {
ModulePassManager NestedMPM(DebugLogging);
if (!parseModulePassPipeline(NestedMPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
MPM.addPass(createRepeatedPass(*Count, std::move(NestedMPM)));
return true;
}
for (auto &C : ModulePipelineParsingCallbacks)
if (C(Name, MPM, InnerPipeline))
return true;
// Normal passes can't have pipelines.
return false;
}
// Manually handle aliases for pre-configured pipeline fragments.
if (startsWithDefaultPipelineAliasPrefix(Name)) {
SmallVector<StringRef, 3> Matches;
if (!DefaultAliasRegex.match(Name, &Matches))
return false;
assert(Matches.size() == 3 && "Must capture two matched strings!");
OptimizationLevel L = StringSwitch<OptimizationLevel>(Matches[2])
.Case("O0", O0)
.Case("O1", O1)
.Case("O2", O2)
.Case("O3", O3)
.Case("Os", Os)
.Case("Oz", Oz);
if (L == O0)
// At O0 we do nothing at all!
return true;
if (Matches[1] == "default") {
MPM.addPass(buildPerModuleDefaultPipeline(L, DebugLogging));
} else if (Matches[1] == "thinlto-pre-link") {
MPM.addPass(buildThinLTOPreLinkDefaultPipeline(L, DebugLogging));
} else if (Matches[1] == "thinlto") {
MPM.addPass(buildThinLTODefaultPipeline(L, DebugLogging, nullptr));
} else if (Matches[1] == "lto-pre-link") {
MPM.addPass(buildLTOPreLinkDefaultPipeline(L, DebugLogging));
} else {
assert(Matches[1] == "lto" && "Not one of the matched options!");
MPM.addPass(buildLTODefaultPipeline(L, DebugLogging, nullptr));
}
return true;
}
// Finally expand the basic registered passes from the .inc file.
#define MODULE_PASS(NAME, CREATE_PASS) \
if (Name == NAME) { \
MPM.addPass(CREATE_PASS); \
return true; \
}
#define MODULE_ANALYSIS(NAME, CREATE_PASS) \
if (Name == "require<" NAME ">") { \
MPM.addPass( \
RequireAnalysisPass< \
std::remove_reference<decltype(CREATE_PASS)>::type, Module>()); \
return true; \
} \
if (Name == "invalidate<" NAME ">") { \
MPM.addPass(InvalidateAnalysisPass< \
std::remove_reference<decltype(CREATE_PASS)>::type>()); \
return true; \
}
#include "PassRegistry.def"
for (auto &C : ModulePipelineParsingCallbacks)
if (C(Name, MPM, InnerPipeline))
return true;
return false;
}
bool PassBuilder::parseCGSCCPass(CGSCCPassManager &CGPM,
const PipelineElement &E, bool VerifyEachPass,
bool DebugLogging) {
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(DebugLogging);
if (!parseCGSCCPassPipeline(NestedCGPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
// Add the nested pass manager with the appropriate adaptor.
CGPM.addPass(std::move(NestedCGPM));
return true;
}
if (Name == "function") {
FunctionPassManager FPM(DebugLogging);
if (!parseFunctionPassPipeline(FPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
// Add the nested pass manager with the appropriate adaptor.
CGPM.addPass(createCGSCCToFunctionPassAdaptor(std::move(FPM)));
return true;
}
if (auto Count = parseRepeatPassName(Name)) {
CGSCCPassManager NestedCGPM(DebugLogging);
if (!parseCGSCCPassPipeline(NestedCGPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
CGPM.addPass(createRepeatedPass(*Count, std::move(NestedCGPM)));
return true;
}
if (auto MaxRepetitions = parseDevirtPassName(Name)) {
CGSCCPassManager NestedCGPM(DebugLogging);
if (!parseCGSCCPassPipeline(NestedCGPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
CGPM.addPass(
createDevirtSCCRepeatedPass(std::move(NestedCGPM), *MaxRepetitions));
return true;
}
for (auto &C : CGSCCPipelineParsingCallbacks)
if (C(Name, CGPM, InnerPipeline))
return true;
// Normal passes can't have pipelines.
return false;
}
// Now expand the basic registered passes from the .inc file.
#define CGSCC_PASS(NAME, CREATE_PASS) \
if (Name == NAME) { \
CGPM.addPass(CREATE_PASS); \
return true; \
}
#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 true; \
} \
if (Name == "invalidate<" NAME ">") { \
CGPM.addPass(InvalidateAnalysisPass< \
std::remove_reference<decltype(CREATE_PASS)>::type>()); \
return true; \
}
#include "PassRegistry.def"
for (auto &C : CGSCCPipelineParsingCallbacks)
if (C(Name, CGPM, InnerPipeline))
return true;
return false;
}
bool PassBuilder::parseFunctionPass(FunctionPassManager &FPM,
const PipelineElement &E,
bool VerifyEachPass, bool DebugLogging) {
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(DebugLogging);
if (!parseFunctionPassPipeline(NestedFPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
// Add the nested pass manager with the appropriate adaptor.
FPM.addPass(std::move(NestedFPM));
return true;
}
if (Name == "loop") {
LoopPassManager LPM(DebugLogging);
if (!parseLoopPassPipeline(LPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
// Add the nested pass manager with the appropriate adaptor.
FPM.addPass(
createFunctionToLoopPassAdaptor(std::move(LPM), DebugLogging));
return true;
}
if (auto Count = parseRepeatPassName(Name)) {
FunctionPassManager NestedFPM(DebugLogging);
if (!parseFunctionPassPipeline(NestedFPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
FPM.addPass(createRepeatedPass(*Count, std::move(NestedFPM)));
return true;
}
for (auto &C : FunctionPipelineParsingCallbacks)
if (C(Name, FPM, InnerPipeline))
return true;
// Normal passes can't have pipelines.
return false;
}
// Now expand the basic registered passes from the .inc file.
#define FUNCTION_PASS(NAME, CREATE_PASS) \
if (Name == NAME) { \
FPM.addPass(CREATE_PASS); \
return true; \
}
#define FUNCTION_ANALYSIS(NAME, CREATE_PASS) \
if (Name == "require<" NAME ">") { \
FPM.addPass( \
RequireAnalysisPass< \
std::remove_reference<decltype(CREATE_PASS)>::type, Function>()); \
return true; \
} \
if (Name == "invalidate<" NAME ">") { \
FPM.addPass(InvalidateAnalysisPass< \
std::remove_reference<decltype(CREATE_PASS)>::type>()); \
return true; \
}
#include "PassRegistry.def"
for (auto &C : FunctionPipelineParsingCallbacks)
if (C(Name, FPM, InnerPipeline))
return true;
return false;
}
bool PassBuilder::parseLoopPass(LoopPassManager &LPM, const PipelineElement &E,
bool VerifyEachPass, bool DebugLogging) {
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(DebugLogging);
if (!parseLoopPassPipeline(NestedLPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
// Add the nested pass manager with the appropriate adaptor.
LPM.addPass(std::move(NestedLPM));
return true;
}
if (auto Count = parseRepeatPassName(Name)) {
LoopPassManager NestedLPM(DebugLogging);
if (!parseLoopPassPipeline(NestedLPM, InnerPipeline, VerifyEachPass,
DebugLogging))
return false;
LPM.addPass(createRepeatedPass(*Count, std::move(NestedLPM)));
return true;
}
for (auto &C : LoopPipelineParsingCallbacks)
if (C(Name, LPM, InnerPipeline))
return true;
// Normal passes can't have pipelines.
return false;
}
// Now expand the basic registered passes from the .inc file.
#define LOOP_PASS(NAME, CREATE_PASS) \
if (Name == NAME) { \
LPM.addPass(CREATE_PASS); \
return true; \
}
#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 true; \
} \
if (Name == "invalidate<" NAME ">") { \
LPM.addPass(InvalidateAnalysisPass< \
std::remove_reference<decltype(CREATE_PASS)>::type>()); \
return true; \
}
#include "PassRegistry.def"
for (auto &C : LoopPipelineParsingCallbacks)
if (C(Name, LPM, InnerPipeline))
return true;
return false;
}
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;
}
bool PassBuilder::parseLoopPassPipeline(LoopPassManager &LPM,
ArrayRef<PipelineElement> Pipeline,
bool VerifyEachPass,
bool DebugLogging) {
for (const auto &Element : Pipeline) {
if (!parseLoopPass(LPM, Element, VerifyEachPass, DebugLogging))
return false;
// FIXME: No verifier support for Loop passes!
}
return true;
}
bool PassBuilder::parseFunctionPassPipeline(FunctionPassManager &FPM,
ArrayRef<PipelineElement> Pipeline,
bool VerifyEachPass,
bool DebugLogging) {
for (const auto &Element : Pipeline) {
if (!parseFunctionPass(FPM, Element, VerifyEachPass, DebugLogging))
return false;
if (VerifyEachPass)
FPM.addPass(VerifierPass());
}
return true;
}
bool PassBuilder::parseCGSCCPassPipeline(CGSCCPassManager &CGPM,
ArrayRef<PipelineElement> Pipeline,
bool VerifyEachPass,
bool DebugLogging) {
for (const auto &Element : Pipeline) {
if (!parseCGSCCPass(CGPM, Element, VerifyEachPass, DebugLogging))
return false;
// FIXME: No verifier support for CGSCC passes!
}
return true;
}
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); });
}
bool PassBuilder::parseModulePassPipeline(ModulePassManager &MPM,
ArrayRef<PipelineElement> Pipeline,
bool VerifyEachPass,
bool DebugLogging) {
for (const auto &Element : Pipeline) {
if (!parseModulePass(MPM, Element, VerifyEachPass, DebugLogging))
return false;
if (VerifyEachPass)
MPM.addPass(VerifierPass());
}
return true;
}
// 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?
bool PassBuilder::parsePassPipeline(ModulePassManager &MPM,
StringRef PipelineText, bool VerifyEachPass,
bool DebugLogging) {
auto Pipeline = parsePipelineText(PipelineText);
if (!Pipeline || Pipeline->empty())
return false;
// If the first name isn't at the module layer, wrap the pipeline up
// automatically.
StringRef FirstName = Pipeline->front().Name;
if (!isModulePassName(FirstName, ModulePipelineParsingCallbacks)) {
if (isCGSCCPassName(FirstName, CGSCCPipelineParsingCallbacks)) {
Pipeline = {{"cgscc", std::move(*Pipeline)}};
} else if (isFunctionPassName(FirstName,
FunctionPipelineParsingCallbacks)) {
Pipeline = {{"function", std::move(*Pipeline)}};
} else if (isLoopPassName(FirstName, LoopPipelineParsingCallbacks)) {
Pipeline = {{"function", {{"loop", std::move(*Pipeline)}}}};
} else {
for (auto &C : TopLevelPipelineParsingCallbacks)
if (C(MPM, *Pipeline, VerifyEachPass, DebugLogging))
return true;
// Unknown pass name!
return false;
}
}
return parseModulePassPipeline(MPM, *Pipeline, VerifyEachPass, DebugLogging);
}
// Primary pass pipeline description parsing routine for a \c CGSCCPassManager
bool PassBuilder::parsePassPipeline(CGSCCPassManager &CGPM,
StringRef PipelineText, bool VerifyEachPass,
bool DebugLogging) {
auto Pipeline = parsePipelineText(PipelineText);
if (!Pipeline || Pipeline->empty())
return false;
StringRef FirstName = Pipeline->front().Name;
if (!isCGSCCPassName(FirstName, CGSCCPipelineParsingCallbacks))
return false;
return parseCGSCCPassPipeline(CGPM, *Pipeline, VerifyEachPass, DebugLogging);
}
// Primary pass pipeline description parsing routine for a \c
// FunctionPassManager
bool PassBuilder::parsePassPipeline(FunctionPassManager &FPM,
StringRef PipelineText, bool VerifyEachPass,
bool DebugLogging) {
auto Pipeline = parsePipelineText(PipelineText);
if (!Pipeline || Pipeline->empty())
return false;
StringRef FirstName = Pipeline->front().Name;
if (!isFunctionPassName(FirstName, FunctionPipelineParsingCallbacks))
return false;
return parseFunctionPassPipeline(FPM, *Pipeline, VerifyEachPass,
DebugLogging);
}
// Primary pass pipeline description parsing routine for a \c LoopPassManager
bool PassBuilder::parsePassPipeline(LoopPassManager &CGPM,
StringRef PipelineText, bool VerifyEachPass,
bool DebugLogging) {
auto Pipeline = parsePipelineText(PipelineText);
if (!Pipeline || Pipeline->empty())
return false;
return parseLoopPassPipeline(CGPM, *Pipeline, VerifyEachPass, DebugLogging);
}
bool 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 true;
}
while (!PipelineText.empty()) {
StringRef Name;
std::tie(Name, PipelineText) = PipelineText.split(',');
if (!parseAAPassName(AA, Name))
return false;
}
return true;
}