1 //===- ModuleSummaryAnalysis.cpp - Module summary index builder -----------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This pass builds a ModuleSummaryIndex object for the module, to be written 11 // to bitcode or LLVM assembly. 12 // 13 //===----------------------------------------------------------------------===// 14 15 #include "llvm/Analysis/ModuleSummaryAnalysis.h" 16 #include "llvm/ADT/MapVector.h" 17 #include "llvm/ADT/SetVector.h" 18 #include "llvm/ADT/Triple.h" 19 #include "llvm/Analysis/BlockFrequencyInfo.h" 20 #include "llvm/Analysis/BlockFrequencyInfoImpl.h" 21 #include "llvm/Analysis/BranchProbabilityInfo.h" 22 #include "llvm/Analysis/IndirectCallPromotionAnalysis.h" 23 #include "llvm/Analysis/LoopInfo.h" 24 #include "llvm/Analysis/ProfileSummaryInfo.h" 25 #include "llvm/Analysis/TypeMetadataUtils.h" 26 #include "llvm/IR/CallSite.h" 27 #include "llvm/IR/Dominators.h" 28 #include "llvm/IR/InstIterator.h" 29 #include "llvm/IR/IntrinsicInst.h" 30 #include "llvm/IR/ValueSymbolTable.h" 31 #include "llvm/Object/ModuleSymbolTable.h" 32 #include "llvm/Pass.h" 33 using namespace llvm; 34 35 #define DEBUG_TYPE "module-summary-analysis" 36 37 // Walk through the operands of a given User via worklist iteration and populate 38 // the set of GlobalValue references encountered. Invoked either on an 39 // Instruction or a GlobalVariable (which walks its initializer). 40 static void findRefEdges(const User *CurUser, SetVector<ValueInfo> &RefEdges, 41 SmallPtrSet<const User *, 8> &Visited) { 42 SmallVector<const User *, 32> Worklist; 43 Worklist.push_back(CurUser); 44 45 while (!Worklist.empty()) { 46 const User *U = Worklist.pop_back_val(); 47 48 if (!Visited.insert(U).second) 49 continue; 50 51 ImmutableCallSite CS(U); 52 53 for (const auto &OI : U->operands()) { 54 const User *Operand = dyn_cast<User>(OI); 55 if (!Operand) 56 continue; 57 if (isa<BlockAddress>(Operand)) 58 continue; 59 if (auto *GV = dyn_cast<GlobalValue>(Operand)) { 60 // We have a reference to a global value. This should be added to 61 // the reference set unless it is a callee. Callees are handled 62 // specially by WriteFunction and are added to a separate list. 63 if (!(CS && CS.isCallee(&OI))) 64 RefEdges.insert(GV); 65 continue; 66 } 67 Worklist.push_back(Operand); 68 } 69 } 70 } 71 72 static CalleeInfo::HotnessType getHotness(uint64_t ProfileCount, 73 ProfileSummaryInfo *PSI) { 74 if (!PSI) 75 return CalleeInfo::HotnessType::Unknown; 76 if (PSI->isHotCount(ProfileCount)) 77 return CalleeInfo::HotnessType::Hot; 78 if (PSI->isColdCount(ProfileCount)) 79 return CalleeInfo::HotnessType::Cold; 80 return CalleeInfo::HotnessType::None; 81 } 82 83 static bool isNonRenamableLocal(const GlobalValue &GV) { 84 return GV.hasSection() && GV.hasLocalLinkage(); 85 } 86 87 /// Determine whether this call has all constant integer arguments (excluding 88 /// "this") and summarize it to VCalls or ConstVCalls as appropriate. 89 static void addVCallToSet(DevirtCallSite Call, GlobalValue::GUID Guid, 90 SetVector<FunctionSummary::VFuncId> &VCalls, 91 SetVector<FunctionSummary::ConstVCall> &ConstVCalls) { 92 std::vector<uint64_t> Args; 93 // Start from the second argument to skip the "this" pointer. 94 for (auto &Arg : make_range(Call.CS.arg_begin() + 1, Call.CS.arg_end())) { 95 auto *CI = dyn_cast<ConstantInt>(Arg); 96 if (!CI || CI->getBitWidth() > 64) { 97 VCalls.insert({Guid, Call.Offset}); 98 return; 99 } 100 Args.push_back(CI->getZExtValue()); 101 } 102 ConstVCalls.insert({{Guid, Call.Offset}, std::move(Args)}); 103 } 104 105 /// If this intrinsic call requires that we add information to the function 106 /// summary, do so via the non-constant reference arguments. 107 static void addIntrinsicToSummary( 108 const CallInst *CI, SetVector<GlobalValue::GUID> &TypeTests, 109 SetVector<FunctionSummary::VFuncId> &TypeTestAssumeVCalls, 110 SetVector<FunctionSummary::VFuncId> &TypeCheckedLoadVCalls, 111 SetVector<FunctionSummary::ConstVCall> &TypeTestAssumeConstVCalls, 112 SetVector<FunctionSummary::ConstVCall> &TypeCheckedLoadConstVCalls) { 113 switch (CI->getCalledFunction()->getIntrinsicID()) { 114 case Intrinsic::type_test: { 115 auto *TypeMDVal = cast<MetadataAsValue>(CI->getArgOperand(1)); 116 auto *TypeId = dyn_cast<MDString>(TypeMDVal->getMetadata()); 117 if (!TypeId) 118 break; 119 GlobalValue::GUID Guid = GlobalValue::getGUID(TypeId->getString()); 120 121 // Produce a summary from type.test intrinsics. We only summarize type.test 122 // intrinsics that are used other than by an llvm.assume intrinsic. 123 // Intrinsics that are assumed are relevant only to the devirtualization 124 // pass, not the type test lowering pass. 125 bool HasNonAssumeUses = llvm::any_of(CI->uses(), [](const Use &CIU) { 126 auto *AssumeCI = dyn_cast<CallInst>(CIU.getUser()); 127 if (!AssumeCI) 128 return true; 129 Function *F = AssumeCI->getCalledFunction(); 130 return !F || F->getIntrinsicID() != Intrinsic::assume; 131 }); 132 if (HasNonAssumeUses) 133 TypeTests.insert(Guid); 134 135 SmallVector<DevirtCallSite, 4> DevirtCalls; 136 SmallVector<CallInst *, 4> Assumes; 137 findDevirtualizableCallsForTypeTest(DevirtCalls, Assumes, CI); 138 for (auto &Call : DevirtCalls) 139 addVCallToSet(Call, Guid, TypeTestAssumeVCalls, 140 TypeTestAssumeConstVCalls); 141 142 break; 143 } 144 145 case Intrinsic::type_checked_load: { 146 auto *TypeMDVal = cast<MetadataAsValue>(CI->getArgOperand(2)); 147 auto *TypeId = dyn_cast<MDString>(TypeMDVal->getMetadata()); 148 if (!TypeId) 149 break; 150 GlobalValue::GUID Guid = GlobalValue::getGUID(TypeId->getString()); 151 152 SmallVector<DevirtCallSite, 4> DevirtCalls; 153 SmallVector<Instruction *, 4> LoadedPtrs; 154 SmallVector<Instruction *, 4> Preds; 155 bool HasNonCallUses = false; 156 findDevirtualizableCallsForTypeCheckedLoad(DevirtCalls, LoadedPtrs, Preds, 157 HasNonCallUses, CI); 158 // Any non-call uses of the result of llvm.type.checked.load will 159 // prevent us from optimizing away the llvm.type.test. 160 if (HasNonCallUses) 161 TypeTests.insert(Guid); 162 for (auto &Call : DevirtCalls) 163 addVCallToSet(Call, Guid, TypeCheckedLoadVCalls, 164 TypeCheckedLoadConstVCalls); 165 166 break; 167 } 168 default: 169 break; 170 } 171 } 172 173 static void 174 computeFunctionSummary(ModuleSummaryIndex &Index, const Module &M, 175 const Function &F, BlockFrequencyInfo *BFI, 176 ProfileSummaryInfo *PSI, bool HasLocalsInUsed, 177 DenseSet<GlobalValue::GUID> &CantBePromoted) { 178 // Summary not currently supported for anonymous functions, they should 179 // have been named. 180 assert(F.hasName()); 181 182 unsigned NumInsts = 0; 183 // Map from callee ValueId to profile count. Used to accumulate profile 184 // counts for all static calls to a given callee. 185 MapVector<ValueInfo, CalleeInfo> CallGraphEdges; 186 SetVector<ValueInfo> RefEdges; 187 SetVector<GlobalValue::GUID> TypeTests; 188 SetVector<FunctionSummary::VFuncId> TypeTestAssumeVCalls, 189 TypeCheckedLoadVCalls; 190 SetVector<FunctionSummary::ConstVCall> TypeTestAssumeConstVCalls, 191 TypeCheckedLoadConstVCalls; 192 ICallPromotionAnalysis ICallAnalysis; 193 194 bool HasInlineAsmMaybeReferencingInternal = false; 195 SmallPtrSet<const User *, 8> Visited; 196 for (const BasicBlock &BB : F) 197 for (const Instruction &I : BB) { 198 if (isa<DbgInfoIntrinsic>(I)) 199 continue; 200 ++NumInsts; 201 findRefEdges(&I, RefEdges, Visited); 202 auto CS = ImmutableCallSite(&I); 203 if (!CS) 204 continue; 205 206 const auto *CI = dyn_cast<CallInst>(&I); 207 // Since we don't know exactly which local values are referenced in inline 208 // assembly, conservatively mark the function as possibly referencing 209 // a local value from inline assembly to ensure we don't export a 210 // reference (which would require renaming and promotion of the 211 // referenced value). 212 if (HasLocalsInUsed && CI && CI->isInlineAsm()) 213 HasInlineAsmMaybeReferencingInternal = true; 214 215 auto *CalledValue = CS.getCalledValue(); 216 auto *CalledFunction = CS.getCalledFunction(); 217 // Check if this is an alias to a function. If so, get the 218 // called aliasee for the checks below. 219 if (auto *GA = dyn_cast<GlobalAlias>(CalledValue)) { 220 assert(!CalledFunction && "Expected null called function in callsite for alias"); 221 CalledFunction = dyn_cast<Function>(GA->getBaseObject()); 222 } 223 // Check if this is a direct call to a known function or a known 224 // intrinsic, or an indirect call with profile data. 225 if (CalledFunction) { 226 if (CI && CalledFunction->isIntrinsic()) { 227 addIntrinsicToSummary( 228 CI, TypeTests, TypeTestAssumeVCalls, TypeCheckedLoadVCalls, 229 TypeTestAssumeConstVCalls, TypeCheckedLoadConstVCalls); 230 continue; 231 } 232 // We should have named any anonymous globals 233 assert(CalledFunction->hasName()); 234 auto ScaledCount = ProfileSummaryInfo::getProfileCount(&I, BFI); 235 auto Hotness = ScaledCount ? getHotness(ScaledCount.getValue(), PSI) 236 : CalleeInfo::HotnessType::Unknown; 237 238 // Use the original CalledValue, in case it was an alias. We want 239 // to record the call edge to the alias in that case. Eventually 240 // an alias summary will be created to associate the alias and 241 // aliasee. 242 CallGraphEdges[cast<GlobalValue>(CalledValue)].updateHotness(Hotness); 243 } else { 244 // Skip inline assembly calls. 245 if (CI && CI->isInlineAsm()) 246 continue; 247 // Skip direct calls. 248 if (!CS.getCalledValue() || isa<Constant>(CS.getCalledValue())) 249 continue; 250 251 uint32_t NumVals, NumCandidates; 252 uint64_t TotalCount; 253 auto CandidateProfileData = 254 ICallAnalysis.getPromotionCandidatesForInstruction( 255 &I, NumVals, TotalCount, NumCandidates); 256 for (auto &Candidate : CandidateProfileData) 257 CallGraphEdges[Candidate.Value].updateHotness( 258 getHotness(Candidate.Count, PSI)); 259 } 260 } 261 262 // Explicit add hot edges to enforce importing for designated GUIDs for 263 // sample PGO, to enable the same inlines as the profiled optimized binary. 264 for (auto &I : F.getImportGUIDs()) 265 CallGraphEdges[I].updateHotness(CalleeInfo::HotnessType::Hot); 266 267 bool NonRenamableLocal = isNonRenamableLocal(F); 268 bool NotEligibleForImport = 269 NonRenamableLocal || HasInlineAsmMaybeReferencingInternal || 270 // Inliner doesn't handle variadic functions. 271 // FIXME: refactor this to use the same code that inliner is using. 272 F.isVarArg(); 273 GlobalValueSummary::GVFlags Flags(F.getLinkage(), NotEligibleForImport, 274 /* LiveRoot = */ false); 275 auto FuncSummary = llvm::make_unique<FunctionSummary>( 276 Flags, NumInsts, RefEdges.takeVector(), CallGraphEdges.takeVector(), 277 TypeTests.takeVector(), TypeTestAssumeVCalls.takeVector(), 278 TypeCheckedLoadVCalls.takeVector(), 279 TypeTestAssumeConstVCalls.takeVector(), 280 TypeCheckedLoadConstVCalls.takeVector()); 281 if (NonRenamableLocal) 282 CantBePromoted.insert(F.getGUID()); 283 Index.addGlobalValueSummary(F.getName(), std::move(FuncSummary)); 284 } 285 286 static void 287 computeVariableSummary(ModuleSummaryIndex &Index, const GlobalVariable &V, 288 DenseSet<GlobalValue::GUID> &CantBePromoted) { 289 SetVector<ValueInfo> RefEdges; 290 SmallPtrSet<const User *, 8> Visited; 291 findRefEdges(&V, RefEdges, Visited); 292 bool NonRenamableLocal = isNonRenamableLocal(V); 293 GlobalValueSummary::GVFlags Flags(V.getLinkage(), NonRenamableLocal, 294 /* LiveRoot = */ false); 295 auto GVarSummary = 296 llvm::make_unique<GlobalVarSummary>(Flags, RefEdges.takeVector()); 297 if (NonRenamableLocal) 298 CantBePromoted.insert(V.getGUID()); 299 Index.addGlobalValueSummary(V.getName(), std::move(GVarSummary)); 300 } 301 302 static void 303 computeAliasSummary(ModuleSummaryIndex &Index, const GlobalAlias &A, 304 DenseSet<GlobalValue::GUID> &CantBePromoted) { 305 bool NonRenamableLocal = isNonRenamableLocal(A); 306 GlobalValueSummary::GVFlags Flags(A.getLinkage(), NonRenamableLocal, 307 /* LiveRoot = */ false); 308 auto AS = llvm::make_unique<AliasSummary>(Flags, ArrayRef<ValueInfo>{}); 309 auto *Aliasee = A.getBaseObject(); 310 auto *AliaseeSummary = Index.getGlobalValueSummary(*Aliasee); 311 assert(AliaseeSummary && "Alias expects aliasee summary to be parsed"); 312 AS->setAliasee(AliaseeSummary); 313 if (NonRenamableLocal) 314 CantBePromoted.insert(A.getGUID()); 315 Index.addGlobalValueSummary(A.getName(), std::move(AS)); 316 } 317 318 // Set LiveRoot flag on entries matching the given value name. 319 static void setLiveRoot(ModuleSummaryIndex &Index, StringRef Name) { 320 auto SummaryList = 321 Index.findGlobalValueSummaryList(GlobalValue::getGUID(Name)); 322 if (SummaryList == Index.end()) 323 return; 324 for (auto &Summary : SummaryList->second) 325 Summary->setLiveRoot(); 326 } 327 328 ModuleSummaryIndex llvm::buildModuleSummaryIndex( 329 const Module &M, 330 std::function<BlockFrequencyInfo *(const Function &F)> GetBFICallback, 331 ProfileSummaryInfo *PSI) { 332 ModuleSummaryIndex Index; 333 334 // Identify the local values in the llvm.used and llvm.compiler.used sets, 335 // which should not be exported as they would then require renaming and 336 // promotion, but we may have opaque uses e.g. in inline asm. We collect them 337 // here because we use this information to mark functions containing inline 338 // assembly calls as not importable. 339 SmallPtrSet<GlobalValue *, 8> LocalsUsed; 340 SmallPtrSet<GlobalValue *, 8> Used; 341 // First collect those in the llvm.used set. 342 collectUsedGlobalVariables(M, Used, /*CompilerUsed*/ false); 343 // Next collect those in the llvm.compiler.used set. 344 collectUsedGlobalVariables(M, Used, /*CompilerUsed*/ true); 345 DenseSet<GlobalValue::GUID> CantBePromoted; 346 for (auto *V : Used) { 347 if (V->hasLocalLinkage()) { 348 LocalsUsed.insert(V); 349 CantBePromoted.insert(V->getGUID()); 350 } 351 } 352 353 // Compute summaries for all functions defined in module, and save in the 354 // index. 355 for (auto &F : M) { 356 if (F.isDeclaration()) 357 continue; 358 359 BlockFrequencyInfo *BFI = nullptr; 360 std::unique_ptr<BlockFrequencyInfo> BFIPtr; 361 if (GetBFICallback) 362 BFI = GetBFICallback(F); 363 else if (F.getEntryCount().hasValue()) { 364 LoopInfo LI{DominatorTree(const_cast<Function &>(F))}; 365 BranchProbabilityInfo BPI{F, LI}; 366 BFIPtr = llvm::make_unique<BlockFrequencyInfo>(F, BPI, LI); 367 BFI = BFIPtr.get(); 368 } 369 370 computeFunctionSummary(Index, M, F, BFI, PSI, !LocalsUsed.empty(), 371 CantBePromoted); 372 } 373 374 // Compute summaries for all variables defined in module, and save in the 375 // index. 376 for (const GlobalVariable &G : M.globals()) { 377 if (G.isDeclaration()) 378 continue; 379 computeVariableSummary(Index, G, CantBePromoted); 380 } 381 382 // Compute summaries for all aliases defined in module, and save in the 383 // index. 384 for (const GlobalAlias &A : M.aliases()) 385 computeAliasSummary(Index, A, CantBePromoted); 386 387 for (auto *V : LocalsUsed) { 388 auto *Summary = Index.getGlobalValueSummary(*V); 389 assert(Summary && "Missing summary for global value"); 390 Summary->setNotEligibleToImport(); 391 } 392 393 // The linker doesn't know about these LLVM produced values, so we need 394 // to flag them as live in the index to ensure index-based dead value 395 // analysis treats them as live roots of the analysis. 396 setLiveRoot(Index, "llvm.used"); 397 setLiveRoot(Index, "llvm.compiler.used"); 398 setLiveRoot(Index, "llvm.global_ctors"); 399 setLiveRoot(Index, "llvm.global_dtors"); 400 setLiveRoot(Index, "llvm.global.annotations"); 401 402 if (!M.getModuleInlineAsm().empty()) { 403 // Collect the local values defined by module level asm, and set up 404 // summaries for these symbols so that they can be marked as NoRename, 405 // to prevent export of any use of them in regular IR that would require 406 // renaming within the module level asm. Note we don't need to create a 407 // summary for weak or global defs, as they don't need to be flagged as 408 // NoRename, and defs in module level asm can't be imported anyway. 409 // Also, any values used but not defined within module level asm should 410 // be listed on the llvm.used or llvm.compiler.used global and marked as 411 // referenced from there. 412 ModuleSymbolTable::CollectAsmSymbols( 413 M, [&M, &Index, &CantBePromoted](StringRef Name, 414 object::BasicSymbolRef::Flags Flags) { 415 // Symbols not marked as Weak or Global are local definitions. 416 if (Flags & (object::BasicSymbolRef::SF_Weak | 417 object::BasicSymbolRef::SF_Global)) 418 return; 419 GlobalValue *GV = M.getNamedValue(Name); 420 if (!GV) 421 return; 422 assert(GV->isDeclaration() && "Def in module asm already has definition"); 423 GlobalValueSummary::GVFlags GVFlags(GlobalValue::InternalLinkage, 424 /* NotEligibleToImport */ true, 425 /* LiveRoot */ true); 426 CantBePromoted.insert(GlobalValue::getGUID(Name)); 427 // Create the appropriate summary type. 428 if (isa<Function>(GV)) { 429 std::unique_ptr<FunctionSummary> Summary = 430 llvm::make_unique<FunctionSummary>( 431 GVFlags, 0, ArrayRef<ValueInfo>{}, 432 ArrayRef<FunctionSummary::EdgeTy>{}, 433 ArrayRef<GlobalValue::GUID>{}, 434 ArrayRef<FunctionSummary::VFuncId>{}, 435 ArrayRef<FunctionSummary::VFuncId>{}, 436 ArrayRef<FunctionSummary::ConstVCall>{}, 437 ArrayRef<FunctionSummary::ConstVCall>{}); 438 Index.addGlobalValueSummary(Name, std::move(Summary)); 439 } else { 440 std::unique_ptr<GlobalVarSummary> Summary = 441 llvm::make_unique<GlobalVarSummary>(GVFlags, 442 ArrayRef<ValueInfo>{}); 443 Index.addGlobalValueSummary(Name, std::move(Summary)); 444 } 445 }); 446 } 447 448 for (auto &GlobalList : Index) { 449 assert(GlobalList.second.size() == 1 && 450 "Expected module's index to have one summary per GUID"); 451 auto &Summary = GlobalList.second[0]; 452 bool AllRefsCanBeExternallyReferenced = 453 llvm::all_of(Summary->refs(), [&](const ValueInfo &VI) { 454 return !CantBePromoted.count(VI.getValue()->getGUID()); 455 }); 456 if (!AllRefsCanBeExternallyReferenced) { 457 Summary->setNotEligibleToImport(); 458 continue; 459 } 460 461 if (auto *FuncSummary = dyn_cast<FunctionSummary>(Summary.get())) { 462 bool AllCallsCanBeExternallyReferenced = llvm::all_of( 463 FuncSummary->calls(), [&](const FunctionSummary::EdgeTy &Edge) { 464 auto GUID = Edge.first.isGUID() ? Edge.first.getGUID() 465 : Edge.first.getValue()->getGUID(); 466 return !CantBePromoted.count(GUID); 467 }); 468 if (!AllCallsCanBeExternallyReferenced) 469 Summary->setNotEligibleToImport(); 470 } 471 } 472 473 return Index; 474 } 475 476 AnalysisKey ModuleSummaryIndexAnalysis::Key; 477 478 ModuleSummaryIndex 479 ModuleSummaryIndexAnalysis::run(Module &M, ModuleAnalysisManager &AM) { 480 ProfileSummaryInfo &PSI = AM.getResult<ProfileSummaryAnalysis>(M); 481 auto &FAM = AM.getResult<FunctionAnalysisManagerModuleProxy>(M).getManager(); 482 return buildModuleSummaryIndex( 483 M, 484 [&FAM](const Function &F) { 485 return &FAM.getResult<BlockFrequencyAnalysis>( 486 *const_cast<Function *>(&F)); 487 }, 488 &PSI); 489 } 490 491 char ModuleSummaryIndexWrapperPass::ID = 0; 492 INITIALIZE_PASS_BEGIN(ModuleSummaryIndexWrapperPass, "module-summary-analysis", 493 "Module Summary Analysis", false, true) 494 INITIALIZE_PASS_DEPENDENCY(BlockFrequencyInfoWrapperPass) 495 INITIALIZE_PASS_DEPENDENCY(ProfileSummaryInfoWrapperPass) 496 INITIALIZE_PASS_END(ModuleSummaryIndexWrapperPass, "module-summary-analysis", 497 "Module Summary Analysis", false, true) 498 499 ModulePass *llvm::createModuleSummaryIndexWrapperPass() { 500 return new ModuleSummaryIndexWrapperPass(); 501 } 502 503 ModuleSummaryIndexWrapperPass::ModuleSummaryIndexWrapperPass() 504 : ModulePass(ID) { 505 initializeModuleSummaryIndexWrapperPassPass(*PassRegistry::getPassRegistry()); 506 } 507 508 bool ModuleSummaryIndexWrapperPass::runOnModule(Module &M) { 509 auto &PSI = *getAnalysis<ProfileSummaryInfoWrapperPass>().getPSI(); 510 Index = buildModuleSummaryIndex( 511 M, 512 [this](const Function &F) { 513 return &(this->getAnalysis<BlockFrequencyInfoWrapperPass>( 514 *const_cast<Function *>(&F)) 515 .getBFI()); 516 }, 517 &PSI); 518 return false; 519 } 520 521 bool ModuleSummaryIndexWrapperPass::doFinalization(Module &M) { 522 Index.reset(); 523 return false; 524 } 525 526 void ModuleSummaryIndexWrapperPass::getAnalysisUsage(AnalysisUsage &AU) const { 527 AU.setPreservesAll(); 528 AU.addRequired<BlockFrequencyInfoWrapperPass>(); 529 AU.addRequired<ProfileSummaryInfoWrapperPass>(); 530 } 531