lib/Transforms/IPO/PassManagerBuilder.cpp

   1 //===- PassManagerBuilder.cpp - Build Standard Pass -----------------------===//
   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 file defines the PassManagerBuilder class, which is used to set up a
  11 // "standard" optimization sequence suitable for languages like C and C++.
  12 //
  13 //===----------------------------------------------------------------------===//
  14
  15
  16 #include "llvm/Transforms/IPO/PassManagerBuilder.h"
  17 #include "llvm-c/Transforms/PassManagerBuilder.h"
  18 #include "llvm/ADT/SmallVector.h"
  19 #include "llvm/Analysis/Passes.h"
  20 #include "llvm/IR/DataLayout.h"
  21 #include "llvm/IR/Verifier.h"
  22 #include "llvm/PassManager.h"
  23 #include "llvm/Support/CommandLine.h"
  24 #include "llvm/Support/ManagedStatic.h"
  25 #include "llvm/Target/TargetLibraryInfo.h"
  26 #include "llvm/Target/TargetMachine.h"
  27 #include "llvm/Target/TargetSubtargetInfo.h"
  28 #include "llvm/Transforms/IPO.h"
  29 #include "llvm/Transforms/Scalar.h"
  30 #include "llvm/Transforms/Vectorize.h"
  31
  32 using namespace llvm;
  33
  34 static cl::opt<bool>
  35 RunLoopVectorization("vectorize-loops", cl::Hidden,
  36                      cl::desc("Run the Loop vectorization passes"));
  37
  38 static cl::opt<bool>
  39 RunSLPVectorization("vectorize-slp", cl::Hidden,
  40                     cl::desc("Run the SLP vectorization passes"));
  41
  42 static cl::opt<bool>
  43 RunBBVectorization("vectorize-slp-aggressive", cl::Hidden,
  44                     cl::desc("Run the BB vectorization passes"));
  45
  46 static cl::opt<bool>
  47 UseGVNAfterVectorization("use-gvn-after-vectorization",
  48   cl::init(false), cl::Hidden,
  49   cl::desc("Run GVN instead of Early CSE after vectorization passes"));
  50
  51 static cl::opt<bool> UseNewSROA("use-new-sroa",
  52   cl::init(true), cl::Hidden,
  53   cl::desc("Enable the new, experimental SROA pass"));
  54
  55 static cl::opt<bool>
  56 RunLoopRerolling("reroll-loops", cl::Hidden,
  57                  cl::desc("Run the loop rerolling pass"));
  58
  59 static cl::opt<bool> RunLoadCombine("combine-loads", cl::init(false),
  60                                     cl::Hidden,
  61                                     cl::desc("Run the load combining pass"));
  62
  63 static cl::opt<bool>
  64 RunSLPAfterLoopVectorization("run-slp-after-loop-vectorization",
  65   cl::init(true), cl::Hidden,
  66   cl::desc("Run the SLP vectorizer (and BB vectorizer) after the Loop "
  67            "vectorizer instead of before"));
  68
  69 static cl::opt<bool> UseCFLAA("use-cfl-aa",
  70   cl::init(false), cl::Hidden,
  71   cl::desc("Enable the new, experimental CFL alias analysis"));
  72
  73 static cl::opt<bool>
  74 EnableMLSM("mlsm", cl::init(true), cl::Hidden,
  75            cl::desc("Enable motion of merged load and store"));
  76
  77 PassManagerBuilder::PassManagerBuilder() {
  78     OptLevel = 2;
  79     SizeLevel = 0;
  80     LibraryInfo = nullptr;
  81     Inliner = nullptr;
  82     DisableTailCalls = false;
  83     DisableUnitAtATime = false;
  84     DisableUnrollLoops = false;
  85     BBVectorize = RunBBVectorization;
  86     SLPVectorize = RunSLPVectorization;
  87     LoopVectorize = RunLoopVectorization;
  88     RerollLoops = RunLoopRerolling;
  89     LoadCombine = RunLoadCombine;
  90     DisableGVNLoadPRE = false;
  91     VerifyInput = false;
  92     VerifyOutput = false;
  93     StripDebug = false;
  94     MergeFunctions = false;
  95 }
  96
  97 PassManagerBuilder::~PassManagerBuilder() {
  98   delete LibraryInfo;
  99   delete Inliner;
 100 }
 101
 102 /// Set of global extensions, automatically added as part of the standard set.
 103 static ManagedStatic<SmallVector<std::pair<PassManagerBuilder::ExtensionPointTy,
 104    PassManagerBuilder::ExtensionFn>, 8> > GlobalExtensions;
 105
 106 void PassManagerBuilder::addGlobalExtension(
 107     PassManagerBuilder::ExtensionPointTy Ty,
 108     PassManagerBuilder::ExtensionFn Fn) {
 109   GlobalExtensions->push_back(std::make_pair(Ty, Fn));
 110 }
 111
 112 void PassManagerBuilder::addExtension(ExtensionPointTy Ty, ExtensionFn Fn) {
 113   Extensions.push_back(std::make_pair(Ty, Fn));
 114 }
 115
 116 void PassManagerBuilder::addExtensionsToPM(ExtensionPointTy ETy,
 117                                            PassManagerBase &PM) const {
 118   for (unsigned i = 0, e = GlobalExtensions->size(); i != e; ++i)
 119     if ((*GlobalExtensions)[i].first == ETy)
 120       (*GlobalExtensions)[i].second(*this, PM);
 121   for (unsigned i = 0, e = Extensions.size(); i != e; ++i)
 122     if (Extensions[i].first == ETy)
 123       Extensions[i].second(*this, PM);
 124 }
 125
 126 void
 127 PassManagerBuilder::addInitialAliasAnalysisPasses(PassManagerBase &PM) const {
 128   // Add TypeBasedAliasAnalysis before BasicAliasAnalysis so that
 129   // BasicAliasAnalysis wins if they disagree. This is intended to help
 130   // support "obvious" type-punning idioms.
 131   if (UseCFLAA)
 132     PM.add(createCFLAliasAnalysisPass());
 133   PM.add(createTypeBasedAliasAnalysisPass());
 134   PM.add(createScopedNoAliasAAPass());
 135   PM.add(createBasicAliasAnalysisPass());
 136 }
 137
 138 void PassManagerBuilder::populateFunctionPassManager(FunctionPassManager &FPM) {
 139   addExtensionsToPM(EP_EarlyAsPossible, FPM);
 140
 141   // Add LibraryInfo if we have some.
 142   if (LibraryInfo) FPM.add(new TargetLibraryInfo(*LibraryInfo));
 143
 144   if (OptLevel == 0) return;
 145
 146   addInitialAliasAnalysisPasses(FPM);
 147
 148   FPM.add(createCFGSimplificationPass());
 149   if (UseNewSROA)
 150     FPM.add(createSROAPass());
 151   else
 152     FPM.add(createScalarReplAggregatesPass());
 153   FPM.add(createEarlyCSEPass());
 154   FPM.add(createLowerExpectIntrinsicPass());
 155 }
 156
 157 void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
 158   // If all optimizations are disabled, just run the always-inline pass.
 159   if (OptLevel == 0) {
 160     if (Inliner) {
 161       MPM.add(Inliner);
 162       Inliner = nullptr;
 163     }
 164
 165     // FIXME: This is a HACK! The inliner pass above implicitly creates a CGSCC
 166     // pass manager, but we don't want to add extensions into that pass manager.
 167     // To prevent this we must insert a no-op module pass to reset the pass
 168     // manager to get the same behavior as EP_OptimizerLast in non-O0 builds.
 169     if (!GlobalExtensions->empty() || !Extensions.empty())
 170       MPM.add(createBarrierNoopPass());
 171
 172     addExtensionsToPM(EP_EnabledOnOptLevel0, MPM);
 173     return;
 174   }
 175
 176   // Add LibraryInfo if we have some.
 177   if (LibraryInfo) MPM.add(new TargetLibraryInfo(*LibraryInfo));
 178
 179   addInitialAliasAnalysisPasses(MPM);
 180
 181   if (!DisableUnitAtATime) {
 182     addExtensionsToPM(EP_ModuleOptimizerEarly, MPM);
 183
 184     MPM.add(createIPSCCPPass());              // IP SCCP
 185     MPM.add(createGlobalOptimizerPass());     // Optimize out global vars
 186
 187     MPM.add(createDeadArgEliminationPass());  // Dead argument elimination
 188
 189     MPM.add(createInstructionCombiningPass());// Clean up after IPCP & DAE
 190     addExtensionsToPM(EP_Peephole, MPM);
 191     MPM.add(createCFGSimplificationPass());   // Clean up after IPCP & DAE
 192   }
 193
 194   // Start of CallGraph SCC passes.
 195   if (!DisableUnitAtATime)
 196     MPM.add(createPruneEHPass());             // Remove dead EH info
 197   if (Inliner) {
 198     MPM.add(Inliner);
 199     Inliner = nullptr;
 200   }
 201   if (!DisableUnitAtATime)
 202     MPM.add(createFunctionAttrsPass());       // Set readonly/readnone attrs
 203   if (OptLevel > 2)
 204     MPM.add(createArgumentPromotionPass());   // Scalarize uninlined fn args
 205
 206   // Start of function pass.
 207   // Break up aggregate allocas, using SSAUpdater.
 208   if (UseNewSROA)
 209     MPM.add(createSROAPass(/*RequiresDomTree*/ false));
 210   else
 211     MPM.add(createScalarReplAggregatesPass(-1, false));
 212   MPM.add(createEarlyCSEPass());              // Catch trivial redundancies
 213   MPM.add(createJumpThreadingPass());         // Thread jumps.
 214   MPM.add(createCorrelatedValuePropagationPass()); // Propagate conditionals
 215   MPM.add(createCFGSimplificationPass());     // Merge & remove BBs
 216   MPM.add(createInstructionCombiningPass());  // Combine silly seq's
 217   addExtensionsToPM(EP_Peephole, MPM);
 218
 219   if (!DisableTailCalls)
 220     MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
 221   MPM.add(createCFGSimplificationPass());     // Merge & remove BBs
 222   MPM.add(createReassociatePass());           // Reassociate expressions
 223   MPM.add(createLoopRotatePass());            // Rotate Loop
 224   MPM.add(createLICMPass());                  // Hoist loop invariants
 225   MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3));
 226   MPM.add(createInstructionCombiningPass());
 227   MPM.add(createIndVarSimplifyPass());        // Canonicalize indvars
 228   MPM.add(createLoopIdiomPass());             // Recognize idioms like memset.
 229   MPM.add(createLoopDeletionPass());          // Delete dead loops
 230
 231   if (!DisableUnrollLoops)
 232     MPM.add(createSimpleLoopUnrollPass());    // Unroll small loops
 233   addExtensionsToPM(EP_LoopOptimizerEnd, MPM);
 234
 235   if (OptLevel > 1) {
 236     if (EnableMLSM)
 237       MPM.add(createMergedLoadStoreMotionPass()); // Merge ld/st in diamonds
 238     MPM.add(createGVNPass(DisableGVNLoadPRE));  // Remove redundancies
 239   }
 240   MPM.add(createMemCpyOptPass());             // Remove memcpy / form memset
 241   MPM.add(createSCCPPass());                  // Constant prop with SCCP
 242
 243   // Run instcombine after redundancy elimination to exploit opportunities
 244   // opened up by them.
 245   MPM.add(createInstructionCombiningPass());
 246   addExtensionsToPM(EP_Peephole, MPM);
 247   MPM.add(createJumpThreadingPass());         // Thread jumps
 248   MPM.add(createCorrelatedValuePropagationPass());
 249   MPM.add(createDeadStoreEliminationPass());  // Delete dead stores
 250
 251   addExtensionsToPM(EP_ScalarOptimizerLate, MPM);
 252
 253   if (RerollLoops)
 254     MPM.add(createLoopRerollPass());
 255   if (!RunSLPAfterLoopVectorization) {
 256     if (SLPVectorize)
 257       MPM.add(createSLPVectorizerPass());   // Vectorize parallel scalar chains.
 258
 259     if (BBVectorize) {
 260       MPM.add(createBBVectorizePass());
 261       MPM.add(createInstructionCombiningPass());
 262       addExtensionsToPM(EP_Peephole, MPM);
 263       if (OptLevel > 1 && UseGVNAfterVectorization)
 264         MPM.add(createGVNPass(DisableGVNLoadPRE)); // Remove redundancies
 265       else
 266         MPM.add(createEarlyCSEPass());      // Catch trivial redundancies
 267
 268       // BBVectorize may have significantly shortened a loop body; unroll again.
 269       if (!DisableUnrollLoops)
 270         MPM.add(createLoopUnrollPass());
 271     }
 272   }
 273
 274   if (LoadCombine)
 275     MPM.add(createLoadCombinePass());
 276
 277   MPM.add(createAggressiveDCEPass());         // Delete dead instructions
 278   MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
 279   MPM.add(createInstructionCombiningPass());  // Clean up after everything.
 280   addExtensionsToPM(EP_Peephole, MPM);
 281
 282   // FIXME: This is a HACK! The inliner pass above implicitly creates a CGSCC
 283   // pass manager that we are specifically trying to avoid. To prevent this
 284   // we must insert a no-op module pass to reset the pass manager.
 285   MPM.add(createBarrierNoopPass());
 286   MPM.add(createLoopVectorizePass(DisableUnrollLoops, LoopVectorize));
 287   // FIXME: Because of #pragma vectorize enable, the passes below are always
 288   // inserted in the pipeline, even when the vectorizer doesn't run (ex. when
 289   // on -O1 and no #pragma is found). Would be good to have these two passes
 290   // as function calls, so that we can only pass them when the vectorizer
 291   // changed the code.
 292   MPM.add(createInstructionCombiningPass());
 293
 294   if (RunSLPAfterLoopVectorization) {
 295     if (SLPVectorize)
 296       MPM.add(createSLPVectorizerPass());   // Vectorize parallel scalar chains.
 297
 298     if (BBVectorize) {
 299       MPM.add(createBBVectorizePass());
 300       MPM.add(createInstructionCombiningPass());
 301       addExtensionsToPM(EP_Peephole, MPM);
 302       if (OptLevel > 1 && UseGVNAfterVectorization)
 303         MPM.add(createGVNPass(DisableGVNLoadPRE)); // Remove redundancies
 304       else
 305         MPM.add(createEarlyCSEPass());      // Catch trivial redundancies
 306
 307       // BBVectorize may have significantly shortened a loop body; unroll again.
 308       if (!DisableUnrollLoops)
 309         MPM.add(createLoopUnrollPass());
 310     }
 311   }
 312
 313   addExtensionsToPM(EP_Peephole, MPM);
 314   MPM.add(createCFGSimplificationPass());
 315
 316   if (!DisableUnrollLoops)
 317     MPM.add(createLoopUnrollPass());    // Unroll small loops
 318
 319   // After vectorization and unrolling, assume intrinsics may tell us more
 320   // about pointer alignments.
 321   MPM.add(createAlignmentFromAssumptionsPass());
 322
 323   if (!DisableUnitAtATime) {
 324     // FIXME: We shouldn't bother with this anymore.
 325     MPM.add(createStripDeadPrototypesPass()); // Get rid of dead prototypes
 326
 327     // GlobalOpt already deletes dead functions and globals, at -O2 try a
 328     // late pass of GlobalDCE.  It is capable of deleting dead cycles.
 329     if (OptLevel > 1) {
 330       MPM.add(createGlobalDCEPass());         // Remove dead fns and globals.
 331       MPM.add(createConstantMergePass());     // Merge dup global constants
 332     }
 333   }
 334
 335   if (MergeFunctions)
 336     MPM.add(createMergeFunctionsPass());
 337
 338   addExtensionsToPM(EP_OptimizerLast, MPM);
 339 }
 340
 341 void PassManagerBuilder::addLTOOptimizationPasses(PassManagerBase &PM) {
 342   // Provide AliasAnalysis services for optimizations.
 343   addInitialAliasAnalysisPasses(PM);
 344
 345   // Propagate constants at call sites into the functions they call.  This
 346   // opens opportunities for globalopt (and inlining) by substituting function
 347   // pointers passed as arguments to direct uses of functions.
 348   PM.add(createIPSCCPPass());
 349
 350   // Now that we internalized some globals, see if we can hack on them!
 351   PM.add(createGlobalOptimizerPass());
 352
 353   // Linking modules together can lead to duplicated global constants, only
 354   // keep one copy of each constant.
 355   PM.add(createConstantMergePass());
 356
 357   // Remove unused arguments from functions.
 358   PM.add(createDeadArgEliminationPass());
 359
 360   // Reduce the code after globalopt and ipsccp.  Both can open up significant
 361   // simplification opportunities, and both can propagate functions through
 362   // function pointers.  When this happens, we often have to resolve varargs
 363   // calls, etc, so let instcombine do this.
 364   PM.add(createInstructionCombiningPass());
 365   addExtensionsToPM(EP_Peephole, PM);
 366
 367   // Inline small functions
 368   bool RunInliner = Inliner;
 369   if (RunInliner) {
 370     PM.add(Inliner);
 371     Inliner = nullptr;
 372   }
 373
 374   PM.add(createPruneEHPass());   // Remove dead EH info.
 375
 376   // Optimize globals again if we ran the inliner.
 377   if (RunInliner)
 378     PM.add(createGlobalOptimizerPass());
 379   PM.add(createGlobalDCEPass()); // Remove dead functions.
 380
 381   // If we didn't decide to inline a function, check to see if we can
 382   // transform it to pass arguments by value instead of by reference.
 383   PM.add(createArgumentPromotionPass());
 384
 385   // The IPO passes may leave cruft around.  Clean up after them.
 386   PM.add(createInstructionCombiningPass());
 387   addExtensionsToPM(EP_Peephole, PM);
 388   PM.add(createJumpThreadingPass());
 389
 390   // Break up allocas
 391   if (UseNewSROA)
 392     PM.add(createSROAPass());
 393   else
 394     PM.add(createScalarReplAggregatesPass());
 395
 396   // Run a few AA driven optimizations here and now, to cleanup the code.
 397   PM.add(createFunctionAttrsPass()); // Add nocapture.
 398   PM.add(createGlobalsModRefPass()); // IP alias analysis.
 399
 400   PM.add(createLICMPass());                 // Hoist loop invariants.
 401   if (EnableMLSM)
 402     PM.add(createMergedLoadStoreMotionPass()); // Merge ld/st in diamonds.
 403   PM.add(createGVNPass(DisableGVNLoadPRE)); // Remove redundancies.
 404   PM.add(createMemCpyOptPass());            // Remove dead memcpys.
 405
 406   // Nuke dead stores.
 407   PM.add(createDeadStoreEliminationPass());
 408
 409   // More loops are countable; try to optimize them.
 410   PM.add(createIndVarSimplifyPass());
 411   PM.add(createLoopDeletionPass());
 412   PM.add(createLoopVectorizePass(true, true));
 413
 414   // More scalar chains could be vectorized due to more alias information
 415   PM.add(createSLPVectorizerPass()); // Vectorize parallel scalar chains.
 416
 417   // After vectorization, assume intrinsics may tell us more about pointer
 418   // alignments.
 419   PM.add(createAlignmentFromAssumptionsPass());
 420
 421   if (LoadCombine)
 422     PM.add(createLoadCombinePass());
 423
 424   // Cleanup and simplify the code after the scalar optimizations.
 425   PM.add(createInstructionCombiningPass());
 426   addExtensionsToPM(EP_Peephole, PM);
 427
 428   PM.add(createJumpThreadingPass());
 429
 430   // Delete basic blocks, which optimization passes may have killed.
 431   PM.add(createCFGSimplificationPass());
 432
 433   // Now that we have optimized the program, discard unreachable functions.
 434   PM.add(createGlobalDCEPass());
 435
 436   // FIXME: this is profitable (for compiler time) to do at -O0 too, but
 437   // currently it damages debug info.
 438   if (MergeFunctions)
 439     PM.add(createMergeFunctionsPass());
 440 }
 441
 442 void PassManagerBuilder::populateLTOPassManager(PassManagerBase &PM,
 443                                                 TargetMachine *TM) {
 444   if (TM) {
 445     PM.add(new DataLayoutPass());
 446     TM->addAnalysisPasses(PM);
 447   }
 448
 449   if (LibraryInfo)
 450     PM.add(new TargetLibraryInfo(*LibraryInfo));
 451
 452   if (VerifyInput)
 453     PM.add(createVerifierPass());
 454
 455   if (StripDebug)
 456     PM.add(createStripSymbolsPass(true));
 457
 458   if (VerifyInput)
 459     PM.add(createDebugInfoVerifierPass());
 460
 461   if (OptLevel != 0)
 462     addLTOOptimizationPasses(PM);
 463
 464   if (VerifyOutput) {
 465     PM.add(createVerifierPass());
 466     PM.add(createDebugInfoVerifierPass());
 467   }
 468 }
 469
 470 inline PassManagerBuilder *unwrap(LLVMPassManagerBuilderRef P) {
 471     return reinterpret_cast<PassManagerBuilder*>(P);
 472 }
 473
 474 inline LLVMPassManagerBuilderRef wrap(PassManagerBuilder *P) {
 475   return reinterpret_cast<LLVMPassManagerBuilderRef>(P);
 476 }
 477
 478 LLVMPassManagerBuilderRef LLVMPassManagerBuilderCreate() {
 479   PassManagerBuilder *PMB = new PassManagerBuilder();
 480   return wrap(PMB);
 481 }
 482
 483 void LLVMPassManagerBuilderDispose(LLVMPassManagerBuilderRef PMB) {
 484   PassManagerBuilder *Builder = unwrap(PMB);
 485   delete Builder;
 486 }
 487
 488 void
 489 LLVMPassManagerBuilderSetOptLevel(LLVMPassManagerBuilderRef PMB,
 490                                   unsigned OptLevel) {
 491   PassManagerBuilder *Builder = unwrap(PMB);
 492   Builder->OptLevel = OptLevel;
 493 }
 494
 495 void
 496 LLVMPassManagerBuilderSetSizeLevel(LLVMPassManagerBuilderRef PMB,
 497                                    unsigned SizeLevel) {
 498   PassManagerBuilder *Builder = unwrap(PMB);
 499   Builder->SizeLevel = SizeLevel;
 500 }
 501
 502 void
 503 LLVMPassManagerBuilderSetDisableUnitAtATime(LLVMPassManagerBuilderRef PMB,
 504                                             LLVMBool Value) {
 505   PassManagerBuilder *Builder = unwrap(PMB);
 506   Builder->DisableUnitAtATime = Value;
 507 }
 508
 509 void
 510 LLVMPassManagerBuilderSetDisableUnrollLoops(LLVMPassManagerBuilderRef PMB,
 511                                             LLVMBool Value) {
 512   PassManagerBuilder *Builder = unwrap(PMB);
 513   Builder->DisableUnrollLoops = Value;
 514 }
 515
 516 void
 517 LLVMPassManagerBuilderSetDisableSimplifyLibCalls(LLVMPassManagerBuilderRef PMB,
 518                                                  LLVMBool Value) {
 519   // NOTE: The simplify-libcalls pass has been removed.
 520 }
 521
 522 void
 523 LLVMPassManagerBuilderUseInlinerWithThreshold(LLVMPassManagerBuilderRef PMB,
 524                                               unsigned Threshold) {
 525   PassManagerBuilder *Builder = unwrap(PMB);
 526   Builder->Inliner = createFunctionInliningPass(Threshold);
 527 }
 528
 529 void
 530 LLVMPassManagerBuilderPopulateFunctionPassManager(LLVMPassManagerBuilderRef PMB,
 531                                                   LLVMPassManagerRef PM) {
 532   PassManagerBuilder *Builder = unwrap(PMB);
 533   FunctionPassManager *FPM = unwrap<FunctionPassManager>(PM);
 534   Builder->populateFunctionPassManager(*FPM);
 535 }
 536
 537 void
 538 LLVMPassManagerBuilderPopulateModulePassManager(LLVMPassManagerBuilderRef PMB,
 539                                                 LLVMPassManagerRef PM) {
 540   PassManagerBuilder *Builder = unwrap(PMB);
 541   PassManagerBase *MPM = unwrap(PM);
 542   Builder->populateModulePassManager(*MPM);
 543 }
 544
 545 void LLVMPassManagerBuilderPopulateLTOPassManager(LLVMPassManagerBuilderRef PMB,
 546                                                   LLVMPassManagerRef PM,
 547                                                   LLVMBool Internalize,
 548                                                   LLVMBool RunInliner) {
 549   PassManagerBuilder *Builder = unwrap(PMB);
 550   PassManagerBase *LPM = unwrap(PM);
 551
 552   // A small backwards compatibility hack. populateLTOPassManager used to take
 553   // an RunInliner option.
 554   if (RunInliner && !Builder->Inliner)
 555     Builder->Inliner = createFunctionInliningPass();
 556
 557   Builder->populateLTOPassManager(*LPM);
 558 }