74#define DEBUG_TYPE "globalopt"
76STATISTIC(NumMarked ,
"Number of globals marked constant");
77STATISTIC(NumUnnamed ,
"Number of globals marked unnamed_addr");
78STATISTIC(NumSRA ,
"Number of aggregate globals broken into scalars");
79STATISTIC(NumSubstitute,
"Number of globals with initializers stored into them");
81STATISTIC(NumGlobUses ,
"Number of global uses devirtualized");
82STATISTIC(NumLocalized ,
"Number of globals localized");
83STATISTIC(NumShrunkToBool ,
"Number of global vars shrunk to booleans");
84STATISTIC(NumFastCallFns ,
"Number of functions converted to fastcc");
85STATISTIC(NumCtorsEvaluated,
"Number of static ctors evaluated");
86STATISTIC(NumNestRemoved ,
"Number of nest attributes removed");
87STATISTIC(NumAliasesResolved,
"Number of global aliases resolved");
88STATISTIC(NumAliasesRemoved,
"Number of global aliases eliminated");
89STATISTIC(NumCXXDtorsRemoved,
"Number of global C++ destructors removed");
90STATISTIC(NumInternalFunc,
"Number of internal functions");
91STATISTIC(NumColdCC,
"Number of functions marked coldcc");
95 cl::desc(
"Enable stress test of coldcc by adding "
96 "calling conv to all internal functions."),
102 "Maximum block frequency, expressed as a percentage of caller's "
103 "entry frequency, for a call site to be considered cold for enabling"
125 Type *Ty = Types.pop_back_val();
132 if (cast<VectorType>(Ty)->getElementType()->isPointerTy())
136 Types.push_back(cast<ArrayType>(Ty)->getElementType());
142 if (isa<PointerType>(InnerTy))
return true;
143 if (isa<StructType>(InnerTy) || isa<ArrayType>(InnerTy) ||
144 isa<VectorType>(InnerTy))
145 Types.push_back(InnerTy);
150 if (--Limit == 0)
return true;
151 }
while (!Types.empty());
161 if (isa<Constant>(V))
165 if (isa<LoadInst>(V) || isa<InvokeInst>(V) || isa<Argument>(V) ||
172 if (
I->mayHaveSideEffects())
175 if (!
GEP->hasAllConstantIndices())
177 }
else if (
I->getNumOperands() != 1) {
181 V =
I->getOperand(0);
200 bool Changed =
false;
208 while (!Worklist.
empty()) {
210 if (
StoreInst *SI = dyn_cast<StoreInst>(U)) {
211 Value *V = SI->getValueOperand();
212 if (isa<Constant>(V)) {
214 SI->eraseFromParent();
217 Dead.push_back(std::make_pair(
I, SI));
219 }
else if (
MemSetInst *MSI = dyn_cast<MemSetInst>(U)) {
220 if (isa<Constant>(MSI->getValue())) {
222 MSI->eraseFromParent();
223 }
else if (
Instruction *
I = dyn_cast<Instruction>(MSI->getValue())) {
225 Dead.push_back(std::make_pair(
I, MSI));
228 GlobalVariable *MemSrc = dyn_cast<GlobalVariable>(MTI->getSource());
231 MTI->eraseFromParent();
232 }
else if (
Instruction *
I = dyn_cast<Instruction>(MTI->getSource())) {
234 Dead.push_back(std::make_pair(
I, MTI));
236 }
else if (
ConstantExpr *CE = dyn_cast<ConstantExpr>(U)) {
237 if (isa<GEPOperator>(CE))
242 for (
int i = 0, e = Dead.size(); i != e; ++i) {
244 Dead[i].second->eraseFromParent();
249 Instruction *J = dyn_cast<Instruction>(
I->getOperand(0));
252 I->eraseFromParent();
255 I->eraseFromParent();
272 bool Changed =
false;
277 if (
auto *OpI = dyn_cast<Instruction>(
Op))
279 I->eraseFromParent();
282 while (!WorkList.
empty()) {
284 if (!Visited.
insert(U).second)
287 if (
auto *BO = dyn_cast<BitCastOperator>(U))
289 if (
auto *ASC = dyn_cast<AddrSpaceCastOperator>(U))
291 else if (
auto *
GEP = dyn_cast<GEPOperator>(U))
293 else if (
auto *LI = dyn_cast<LoadInst>(U)) {
296 Type *Ty = LI->getType();
298 LI->replaceAllUsesWith(Res);
303 Value *PtrOp = LI->getPointerOperand();
313 }
else if (
StoreInst *SI = dyn_cast<StoreInst>(U)) {
343 auto AppendUses = [&](
Value *V) {
344 for (
Use &U : V->uses())
345 if (Visited.
insert(&U).second)
349 while (!Worklist.
empty()) {
351 User *V = U->getUser();
353 auto *
GEP = dyn_cast<GEPOperator>(V);
354 if (isa<BitCastOperator>(V) || isa<AddrSpaceCastOperator>(V) ||
355 (
GEP &&
GEP->hasAllConstantIndices())) {
363 if (isa<StoreInst>(V) && U->getOperandNo() == 0)
369 if (
Ptr != GV ||
Offset.getActiveBits() >= 64)
375 const auto &[It, Inserted] =
377 if (Ty != It->second.Ty)
381 It->second.Initializer =
383 if (!It->second.Initializer) {
384 LLVM_DEBUG(
dbgs() <<
"Global SRA: Failed to evaluate initializer of "
385 << *GV <<
" with type " << *Ty <<
" at offset "
386 <<
Offset.getZExtValue());
396 auto *SI = dyn_cast<StoreInst>(V);
400 Constant *StoredConst = dyn_cast<Constant>(SI->getOperand(0));
405 return Initializer != StoredConst;
408 It->second.IsLoaded |= isa<LoadInst>(V);
409 It->second.IsStored |= IsStored(V, It->second.Initializer);
414 if (
auto *
C = dyn_cast<Constant>(V)) {
434 for (
auto *GVE : GVs) {
437 int64_t CurVarOffsetInBytes = 0;
439 uint64_t FragmentEndInBits = FragmentOffsetInBits + FragmentSizeInBits;
446 if (CurVarOffsetInBytes < 0)
450 CurVarOffsetInBits = CHAR_BIT * (
uint64_t)CurVarOffsetInBytes;
453 if (CurVarOffsetInBits >= FragmentEndInBits)
457 uint64_t CurVarEndInBits = CurVarOffsetInBits + CurVarSize;
459 if (CurVarSize != 0 &&
460 CurVarEndInBits <= FragmentOffsetInBits)
465 if (CurVarSize != 0 &&
466 CurVarOffsetInBits >= FragmentOffsetInBits &&
467 CurVarEndInBits <= FragmentEndInBits) {
469 (CurVarOffsetInBits - FragmentOffsetInBits) / 8;
470 if (CurVarOffsetInFragment != 0)
471 Expr = DIExpression::get(Expr->
getContext(), {dwarf::DW_OP_plus_uconst,
472 CurVarOffsetInFragment});
474 Expr = DIExpression::get(Expr->
getContext(), {});
476 DIGlobalVariableExpression::get(GVE->getContext(), Var, Expr);
482 if (FragmentSizeInBits < VarSize) {
483 if (CurVarOffsetInBits > FragmentOffsetInBits)
485 uint64_t CurVarFragmentOffsetInBits =
486 FragmentOffsetInBits - CurVarOffsetInBits;
487 uint64_t CurVarFragmentSizeInBits = FragmentSizeInBits;
488 if (CurVarSize != 0 && CurVarEndInBits < FragmentEndInBits)
489 CurVarFragmentSizeInBits -= (FragmentEndInBits - CurVarEndInBits);
490 if (CurVarOffsetInBits)
491 Expr = DIExpression::get(Expr->
getContext(), {});
493 Expr, CurVarFragmentOffsetInBits, CurVarFragmentSizeInBits))
498 auto *NGVE = DIGlobalVariableExpression::get(GVE->getContext(), Var, Expr);
523 unsigned NumParts =
count_if(Parts, [](
const auto &Pair) {
524 return Pair.second.IsLoaded && Pair.second.IsStored;
531 for (
const auto &Pair : Parts) {
533 {Pair.first, Pair.second.Ty, Pair.second.Initializer});
539 for (
const auto &[OffsetForTy, Ty,
_] : TypesVector) {
544 Offset = OffsetForTy +
DL.getTypeAllocSize(Ty);
551 LLVM_DEBUG(
dbgs() <<
"PERFORMING GLOBAL SRA ON: " << *GV <<
"\n");
554 Align StartAlignment =
560 unsigned NameSuffix = 0;
561 for (
auto &[OffsetForTy, Ty, Initializer] : TypesVector) {
563 *GV->
getParent(), Ty,
false, GlobalVariable::InternalLinkage,
564 Initializer, GV->
getName() +
"." +
Twine(NameSuffix++), GV,
567 NewGlobals.
insert({OffsetForTy, NGV});
573 if (NewAlign >
DL.getABITypeAlign(Ty))
578 DL.getTypeAllocSizeInBits(Ty), VarSize);
585 auto AppendUsers = [&](
Value *V) {
586 for (
User *U : V->users())
587 if (Visited.
insert(U).second)
591 while (!Worklist.
empty()) {
593 if (isa<BitCastOperator>(V) || isa<AddrSpaceCastOperator>(V) ||
594 isa<GEPOperator>(V)) {
596 if (isa<Instruction>(V))
605 assert(
Ptr == GV &&
"Load/store must be from/to global");
607 assert(NGV &&
"Must have replacement global for this offset");
614 if (
auto *LI = dyn_cast<LoadInst>(V)) {
615 LI->setOperand(0, NGV);
616 LI->setAlignment(NewAlign);
618 auto *SI = cast<StoreInst>(V);
619 SI->setOperand(1, NGV);
620 SI->setAlignment(NewAlign);
626 "Other users can only be dead constants");
636 return NewGlobals.
begin()->second;
644 for (
const User *U : V->users()) {
651 if (isa<LoadInst>(U)) {
653 }
else if (
const StoreInst *SI = dyn_cast<StoreInst>(U)) {
654 if (SI->getOperand(0) == V) {
657 }
else if (
const CallInst *CI = dyn_cast<CallInst>(U)) {
658 if (CI->getCalledOperand() != V) {
661 }
else if (
const InvokeInst *II = dyn_cast<InvokeInst>(U)) {
662 if (II->getCalledOperand() != V) {
670 }
else if (
const PHINode *PN = dyn_cast<PHINode>(U)) {
675 }
else if (isa<ICmpInst>(U) &&
676 !ICmpInst::isSigned(cast<ICmpInst>(U)->getPredicate()) &&
677 isa<LoadInst>(U->getOperand(0)) &&
678 isa<ConstantPointerNull>(U->getOperand(1))) {
679 assert(isa<GlobalValue>(cast<LoadInst>(U->getOperand(0))
680 ->getPointerOperand()
681 ->stripPointerCasts()) &&
682 "Should be GlobalVariable");
699 while (!Worklist.
empty()) {
701 for (
const auto *U :
P->users()) {
702 if (
auto *LI = dyn_cast<LoadInst>(U)) {
706 }
else if (
auto *SI = dyn_cast<StoreInst>(U)) {
708 if (SI->getPointerOperand() !=
P)
710 }
else if (
auto *CE = dyn_cast<ConstantExpr>(U)) {
711 if (CE->stripPointerCasts() != GV)
730 while (!Worklist.
empty()) {
732 for (
auto *U :
P->users()) {
733 if (
auto *CE = dyn_cast<ConstantExpr>(U)) {
738 assert((isa<LoadInst>(U) || isa<StoreInst>(U)) &&
739 "Expect only load or store instructions");
746 bool Changed =
false;
747 for (
auto UI = V->user_begin(),
E = V->user_end(); UI !=
E; ) {
753 if (
LoadInst *LI = dyn_cast<LoadInst>(
I)) {
754 LI->setOperand(0, NewV);
756 }
else if (
StoreInst *SI = dyn_cast<StoreInst>(
I)) {
757 if (SI->getOperand(1) == V) {
758 SI->setOperand(1, NewV);
761 }
else if (isa<CallInst>(
I) || isa<InvokeInst>(
I)) {
768 bool PassedAsArg =
false;
769 for (
unsigned i = 0, e = CB->
arg_size(); i != e; ++i)
777 UI = V->user_begin();
783 if (CI->use_empty()) {
785 CI->eraseFromParent();
790 Idxs.
reserve(GEPI->getNumOperands()-1);
793 if (
Constant *
C = dyn_cast<Constant>(*i))
797 if (Idxs.
size() == GEPI->getNumOperands()-1)
801 if (GEPI->use_empty()) {
803 GEPI->eraseFromParent();
818 bool Changed =
false;
822 bool AllNonStoreUsesGone =
true;
826 if (
LoadInst *LI = dyn_cast<LoadInst>(GlobalUser)) {
829 if (LI->use_empty()) {
830 LI->eraseFromParent();
833 AllNonStoreUsesGone =
false;
835 }
else if (isa<StoreInst>(GlobalUser)) {
837 assert(GlobalUser->getOperand(1) == GV &&
838 "Must be storing *to* the global");
840 AllNonStoreUsesGone =
false;
844 assert((isa<PHINode>(GlobalUser) || isa<SelectInst>(GlobalUser) ||
845 isa<ConstantExpr>(GlobalUser) || isa<CmpInst>(GlobalUser) ||
846 isa<BitCastInst>(GlobalUser) ||
847 isa<GetElementPtrInst>(GlobalUser) ||
848 isa<AddrSpaceCastInst>(GlobalUser)) &&
849 "Only expect load and stores!");
854 LLVM_DEBUG(
dbgs() <<
"OPTIMIZED LOADS FROM STORED ONCE POINTER: " << *GV
861 if (AllNonStoreUsesGone) {
885 I->replaceAllUsesWith(NewC);
889 while (UI !=
E && *UI ==
I)
892 I->eraseFromParent();
906 LLVM_DEBUG(
errs() <<
"PROMOTING GLOBAL: " << *GV <<
" CALL = " << *CI
925 if (!isa<UndefValue>(InitVal)) {
928 Builder.
CreateMemSet(NewGV, InitVal, AllocSize, std::nullopt);
941 bool InitBoolUsed =
false;
946 for (
auto *U : Guses) {
947 if (
StoreInst *SI = dyn_cast<StoreInst>(U)) {
952 !isa<ConstantPointerNull>(SI->getValueOperand())),
953 InitBool,
false,
Align(1), SI->getOrdering(),
954 SI->getSyncScopeID(), SI);
955 SI->eraseFromParent();
975 case ICmpInst::ICMP_ULT:
978 case ICmpInst::ICMP_UGE:
981 case ICmpInst::ICMP_ULE:
982 case ICmpInst::ICMP_EQ:
985 case ICmpInst::ICMP_NE:
986 case ICmpInst::ICMP_UGT:
998 cast<StoreInst>(InitBool->
user_back())->eraseFromParent();
1025 while (!Worklist.
empty()) {
1027 if (!Visited.
insert(V).second)
1030 for (
const Use &VUse : V->uses()) {
1031 const User *U = VUse.getUser();
1032 if (isa<LoadInst>(U) || isa<CmpInst>(U))
1035 if (
auto *SI = dyn_cast<StoreInst>(U)) {
1036 if (SI->getValueOperand() == V &&
1037 SI->getPointerOperand()->stripPointerCasts() != GV)
1042 if (
auto *BCI = dyn_cast<BitCastInst>(U)) {
1047 if (
auto *GEPI = dyn_cast<GetElementPtrInst>(U)) {
1084 if (AllocSize >= 2048)
1126 if (
Constant *SOVC = dyn_cast<Constant>(StoredOnceVal)) {
1131 if (
auto *CI = dyn_cast<CallInst>(StoredOnceVal)) {
1132 auto *TLI = &GetTLI(*CI->getFunction());
1162 if (!isa<LoadInst>(U) && !isa<StoreInst>(U))
1183 "No reason to shrink to bool!");
1190 bool IsOneZero =
false;
1191 bool EmitOneOrZero =
true;
1192 auto *CI = dyn_cast<ConstantInt>(OtherVal);
1193 if (CI && CI->getValue().getActiveBits() <= 64) {
1194 IsOneZero = InitVal->
isNullValue() && CI->isOne();
1197 if (CIInit && CIInit->getValue().getActiveBits() <= 64) {
1198 uint64_t ValInit = CIInit->getZExtValue();
1199 uint64_t ValOther = CI->getZExtValue();
1200 uint64_t ValMinus = ValOther - ValInit;
1202 for(
auto *GVe : GVs){
1206 unsigned SizeInOctets =
1218 dwarf::DW_OP_deref_size, SizeInOctets,
1219 dwarf::DW_OP_constu, ValMinus,
1220 dwarf::DW_OP_mul, dwarf::DW_OP_constu, ValInit,
1222 bool WithStackValue =
true;
1225 DIGlobalVariableExpression::get(NewGV->
getContext(), DGV,
E);
1228 EmitOneOrZero =
false;
1232 if (EmitOneOrZero) {
1241 if (
StoreInst *SI = dyn_cast<StoreInst>(UI)) {
1243 bool StoringOther = SI->getOperand(0) == OtherVal;
1246 if (StoringOther || SI->getOperand(0) == InitVal) {
1253 Instruction *StoredVal = cast<Instruction>(SI->getOperand(0));
1258 if (
LoadInst *LI = dyn_cast<LoadInst>(StoredVal)) {
1259 assert(LI->getOperand(0) == GV &&
"Not a copy!");
1263 LI->getOrdering(), LI->getSyncScopeID(), LI);
1265 assert((isa<CastInst>(StoredVal) || isa<SelectInst>(StoredVal)) &&
1266 "This is not a form that we understand!");
1268 assert(isa<LoadInst>(StoreVal) &&
"Not a load of NewGV!");
1272 new StoreInst(StoreVal, NewGV,
false,
Align(1), SI->getOrdering(),
1273 SI->getSyncScopeID(), SI);
1317 if (
auto *
F = dyn_cast<Function>(&GV))
1318 Dead = (
F->isDeclaration() &&
F->use_empty()) ||
F->isDefTriviallyDead();
1325 if (
auto *
F = dyn_cast<Function>(&GV)) {
1326 if (DeleteFnCallback)
1327 DeleteFnCallback(*
F);
1350 for (
auto *U : GV->
users()) {
1354 assert(
I->getParent()->getParent() ==
F);
1356 if (
auto *LI = dyn_cast<LoadInst>(
I))
1358 else if (
auto *SI = dyn_cast<StoreInst>(
I))
1368 auto &DT = LookupDomTree(*
const_cast<Function *
>(
F));
1379 const unsigned Threshold = 100;
1380 if (Loads.
size() * Stores.
size() > Threshold)
1383 for (
auto *L : Loads) {
1384 auto *LTy = L->getType();
1390 return DT.dominates(S, L) &&
1391 DL.getTypeStoreSize(LTy).getFixedValue() <=
1392 DL.getTypeStoreSize(STy).getFixedValue();
1410 if (!isa<Constant>(StoredOnceValue))
1415 if (
auto *LI = dyn_cast<LoadInst>(U)) {
1416 if (LI->getFunction() ==
F &&
1417 LI->getType() == StoredOnceValue->
getType() && LI->isSimple())
1422 bool MadeChange =
false;
1423 if (!Loads.
empty()) {
1424 auto &DT = LookupDomTree(*
const_cast<Function *
>(
F));
1425 for (
auto *LI : Loads) {
1426 if (DT.dominates(StoredOnceStore, LI)) {
1427 LI->replaceAllUsesWith(
const_cast<Value *
>(StoredOnceValue));
1428 LI->eraseFromParent();
1452 if (!GS.HasMultipleAccessingFunctions &&
1453 GS.AccessingFunction &&
1457 GS.AccessingFunction->doesNotRecurse() &&
1464 ->getEntryBlock().begin());
1478 bool Changed =
false;
1509 if (GS.Ordering == AtomicOrdering::NotAtomic) {
1520 LLVM_DEBUG(
dbgs() <<
" *** Marking constant allowed us to simplify "
1521 <<
"all users and delete global!\n");
1535 Value *StoredOnceValue = GS.getStoredOnceValue();
1538 const_cast<Function &
>(*GS.StoredOnceStore->getFunction());
1539 bool CanHaveNonUndefGlobalInitializer =
1540 GetTTI(StoreFn).canHaveNonUndefGlobalInitializerInAddressSpace(
1549 auto *SOVConstant = dyn_cast<Constant>(StoredOnceValue);
1551 DL.getTypeAllocSize(SOVConstant->getType()) ==
1553 CanHaveNonUndefGlobalInitializer) {
1564 NGV->copyAttributesFrom(GV);
1574 LLVM_DEBUG(
dbgs() <<
" *** Substituting initializer allowed us to "
1575 <<
"simplify all users and delete global!\n");
1590 if (GS.NumStores == 1)
1596 if (SOVConstant && GS.Ordering == AtomicOrdering::NotAtomic &&
1598 CanHaveNonUndefGlobalInitializer)) {
1624 bool Changed =
false;
1626 auto NewUnnamedAddr = GV.
hasLocalLinkage() ? GlobalValue::UnnamedAddr::Global
1627 : GlobalValue::UnnamedAddr::Local;
1639 auto *GVar = dyn_cast<GlobalVariable>(&GV);
1643 if (GVar->isConstant() || !GVar->hasInitializer())
1653 for (
User *U :
F->users()) {
1654 if (isa<BlockAddress>(U))
1663 if (Attrs.hasAttrSomewhere(
A, &AttrIndex))
1664 return Attrs.removeAttributeAtIndex(
C, AttrIndex,
A);
1669 F->setAttributes(
StripAttr(
F->getContext(),
F->getAttributes(),
A));
1670 for (
User *U :
F->users()) {
1671 if (isa<BlockAddress>(U))
1696 for (
User *U :
F->users()) {
1697 if (isa<BlockAddress>(U))
1699 CallInst* CI = dyn_cast<CallInst>(U);
1708 if (BB.getTerminatingMustTailCall())
1711 return !
F->hasAddressTaken();
1720 return Res.first->second;
1728 auto CallSiteFreq = CallerBFI.
getBlockFreq(CallSiteBB);
1729 auto CallerEntryFreq =
1731 return CallSiteFreq < CallerEntryFreq * ColdProb;
1741 const std::vector<Function *> &AllCallsCold) {
1746 for (
User *U :
F.users()) {
1747 if (isa<BlockAddress>(U))
1762 for (
User *U :
F->users()) {
1763 if (isa<BlockAddress>(U))
1778 if (
CallInst *CI = dyn_cast<CallInst>(&
I)) {
1780 if (CI->isInlineAsm())
1782 Function *CalledFn = CI->getCalledFunction();
1806 for (
User *U :
F->users()) {
1807 CallBase *CB = dyn_cast<CallBase>(U);
1809 assert(isa<BlockAddress>(U) &&
1810 "Expected either CallBase or BlockAddress");
1820 for (
User *U :
F->users())
1821 if (isa<InvokeInst>(U))
1829 auto *M =
F->getParent();
1835 for (
User *U : PreallocatedCalls) {
1836 CallBase *CB = dyn_cast<CallBase>(U);
1842 "Shouldn't call RemotePreallocated() on a musttail preallocated call");
1846 CallBase *PreallocatedSetup =
nullptr;
1847 for (
auto *It = OpBundles.
begin(); It != OpBundles.
end(); ++It) {
1848 if (It->getTag() ==
"preallocated") {
1849 PreallocatedSetup = cast<CallBase>(*It->input_begin());
1850 OpBundles.
erase(It);
1854 assert(PreallocatedSetup &&
"Did not find preallocated bundle");
1856 cast<ConstantInt>(PreallocatedSetup->
getArgOperand(0))->getZExtValue();
1858 assert((isa<CallInst>(CB) || isa<InvokeInst>(CB)) &&
1859 "Unknown indirect call type");
1879 for (
auto *
User : PreallocatedArgs) {
1880 auto *UseCall = cast<CallBase>(
User);
1881 assert(UseCall->getCalledFunction()->getIntrinsicID() ==
1882 Intrinsic::call_preallocated_arg &&
1883 "preallocated token use was not a llvm.call.preallocated.arg");
1885 cast<ConstantInt>(UseCall->getArgOperand(1))->getZExtValue();
1886 Value *AllocaReplacement = ArgAllocas[AllocArgIndex];
1887 if (!AllocaReplacement) {
1888 auto AddressSpace = UseCall->getType()->getPointerAddressSpace();
1890 UseCall->getFnAttr(Attribute::Preallocated).getValueAsType();
1895 ArgAllocas[AllocArgIndex] = Alloca;
1896 AllocaReplacement = Alloca;
1900 UseCall->eraseFromParent();
1903 cast<Instruction>(PreallocatedSetup)->eraseFromParent();
1917 bool Changed =
false;
1920 std::vector<Function *> AllCallsCold;
1923 AllCallsCold.push_back(&
F);
1929 if (
F.hasFnAttribute(Attribute::Naked))
1933 if (!
F.hasName() && !
F.isDeclaration() && !
F.hasLocalLinkage())
1936 if (
deleteIfDead(
F, NotDiscardableComdats, DeleteFnCallback)) {
1950 if (!
F.isDeclaration()) {
1953 ChangedCFGCallback(
F);
1959 if (!
F.hasLocalLinkage())
1967 if (
F.getAttributes().hasAttrSomewhere(Attribute::InAlloca) &&
1975 if (
F.getAttributes().hasAttrSomewhere(Attribute::Preallocated)) {
1994 ChangeableCCCache.
erase(&
F);
2012 if (
F.getAttributes().hasAttrSomewhere(Attribute::Nest) &&
2013 !
F.hasAddressTaken()) {
2030 bool Changed =
false;
2037 if (GV.hasInitializer())
2038 if (
auto *
C = dyn_cast<Constant>(GV.getInitializer())) {
2039 auto &
DL = M.getDataLayout();
2045 GV.setInitializer(New);
2053 Changed |=
processGlobal(GV, GetTTI, GetTLI, LookupDomTree);
2063 if (
F->isDeclaration())
2072 ++NumCtorsEvaluated;
2077 <<
F->getName() <<
"' to " << NewInitializers.size()
2079 for (
const auto &Pair : NewInitializers)
2080 Pair.first->setInitializer(Pair.second);
2082 GV->setConstant(
true);
2097 V.eraseFromParent();
2102 const Type *UsedArrayType = V.getValueType();
2103 const auto *VAT = cast<ArrayType>(UsedArrayType);
2104 const auto *VEPT = cast<PointerType>(VAT->getArrayElementType());
2108 PointerType::get(V.getContext(), VEPT->getAddressSpace());
2120 Module *M = V.getParent();
2121 V.removeFromParent();
2126 NV->setSection(
"llvm.metadata");
2146 CompilerUsed = {Vec.
begin(), Vec.
end()};
2152 iterator usedBegin() {
return Used.begin(); }
2153 iterator usedEnd() {
return Used.end(); }
2155 used_iterator_range used() {
2156 return used_iterator_range(usedBegin(), usedEnd());
2159 iterator compilerUsedBegin() {
return CompilerUsed.
begin(); }
2160 iterator compilerUsedEnd() {
return CompilerUsed.
end(); }
2162 used_iterator_range compilerUsed() {
2163 return used_iterator_range(compilerUsedBegin(), compilerUsedEnd());
2169 return CompilerUsed.
count(GV);
2177 return CompilerUsed.
insert(GV).second;
2180 void syncVariablesAndSets() {
2194 assert((!U.usedCount(&GA) || !U.compilerUsedCount(&GA)) &&
2195 "We should have removed the duplicated "
2196 "element from llvm.compiler.used");
2203 return !U.usedCount(&GA) && !U.compilerUsedCount(&GA);
2210 return U.usedCount(&GV) || U.compilerUsedCount(&GV);
2214 bool &RenameTarget) {
2215 RenameTarget =
false;
2236 RenameTarget =
true;
2243 bool Changed =
false;
2247 Used.compilerUsedErase(GV);
2258 if (!J.hasName() && !J.isDeclaration() && !J.hasLocalLinkage())
2267 if (!IsModuleLocal(J))
2270 Constant *Aliasee = J.getAliasee();
2281 Target->removeDeadConstantUsers();
2288 J.replaceAllUsesWith(Aliasee);
2289 ++NumAliasesResolved;
2295 Target->setLinkage(J.getLinkage());
2296 Target->setDSOLocal(J.isDSOLocal());
2297 Target->setVisibility(J.getVisibility());
2298 Target->setDLLStorageClass(J.getDLLStorageClass());
2300 if (Used.usedErase(&J))
2303 if (Used.compilerUsedErase(&J))
2304 Used.compilerUsedInsert(
Target);
2310 ++NumAliasesRemoved;
2314 Used.syncVariablesAndSets();
2322 auto FuncIter = M.begin();
2323 if (FuncIter == M.end())
2325 auto *TLI = &GetTLI(*FuncIter);
2331 Function *Fn = M.getFunction(TLI->getName(
F));
2339 if (!TLI->getLibFunc(*Fn,
F) ||
F != LibFunc_cxa_atexit)
2356 if (
I.isDebugOrPseudoInst())
2358 if (isa<ReturnInst>(
I))
2380 bool Changed =
false;
2386 CallInst *CI = dyn_cast<CallInst>(U);
2399 ++NumCXXDtorsRemoved;
2416 bool Changed =
false;
2417 bool LocalChange =
true;
2418 std::optional<uint32_t> FirstNotFullyEvaluatedPriority;
2420 while (LocalChange) {
2421 LocalChange =
false;
2423 NotDiscardableComdats.
clear();
2427 NotDiscardableComdats.
insert(
C);
2429 if (
const Comdat *
C =
F.getComdat())
2430 if (!
F.isDefTriviallyDead())
2431 NotDiscardableComdats.
insert(
C);
2433 if (
const Comdat *
C = GA.getComdat())
2434 if (!GA.isDiscardableIfUnused() || !GA.use_empty())
2435 NotDiscardableComdats.
insert(
C);
2439 NotDiscardableComdats, ChangedCFGCallback,
2445 if (FirstNotFullyEvaluatedPriority &&
2446 *FirstNotFullyEvaluatedPriority != Priority)
2450 FirstNotFullyEvaluatedPriority = Priority;
2456 NotDiscardableComdats);
2467 Changed |= LocalChange;
2477 auto &
DL = M.getDataLayout();
2499 ChangedCFGCallback, DeleteFnCallback))
MachineBasicBlock MachineBasicBlock::iterator DebugLoc DL
Atomic ordering constants.
This file contains the simple types necessary to represent the attributes associated with functions a...
static GCRegistry::Add< OcamlGC > B("ocaml", "ocaml 3.10-compatible GC")
static GCRegistry::Add< ErlangGC > A("erlang", "erlang-compatible garbage collector")
static GCRegistry::Add< CoreCLRGC > E("coreclr", "CoreCLR-compatible GC")
This file contains the declarations for the subclasses of Constant, which represent the different fla...
This file defines the DenseMap class.
This file contains constants used for implementing Dwarf debug support.
Rewrite Partial Register Uses
static bool IsSafeComputationToRemove(Value *V, function_ref< TargetLibraryInfo &(Function &)> GetTLI)
Given a value that is stored to a global but never read, determine whether it's safe to remove the st...
static Function * FindCXAAtExit(Module &M, function_ref< TargetLibraryInfo &(Function &)> GetTLI)
static bool optimizeOnceStoredGlobal(GlobalVariable *GV, Value *StoredOnceVal, const DataLayout &DL, function_ref< TargetLibraryInfo &(Function &)> GetTLI)
static bool tryToOptimizeStoreOfAllocationToGlobal(GlobalVariable *GV, CallInst *CI, const DataLayout &DL, TargetLibraryInfo *TLI)
If we have a global that is only initialized with a fixed size allocation try to transform the progra...
static void ConstantPropUsersOf(Value *V, const DataLayout &DL, TargetLibraryInfo *TLI)
Walk the use list of V, constant folding all of the instructions that are foldable.
static bool hasOnlyColdCalls(Function &F, function_ref< BlockFrequencyInfo &(Function &)> GetBFI, ChangeableCCCacheTy &ChangeableCCCache)
static bool allUsesOfLoadedValueWillTrapIfNull(const GlobalVariable *GV)
Return true if all uses of any loads from GV will trap if the loaded value is null.
static bool hasChangeableCCImpl(Function *F)
Return true if this is a calling convention that we'd like to change.
static bool AllUsesOfValueWillTrapIfNull(const Value *V, SmallPtrSetImpl< const PHINode * > &PHIs)
Return true if all users of the specified value will trap if the value is dynamically null.
Returns whether the given function is an empty C destructor and can therefore be eliminated Note that we assume that other optimization passes have already simplified the code so we simply check for static ret bool cxxDtorIsEmpty(const Function &Fn)
static GlobalVariable * OptimizeGlobalAddressOfAllocation(GlobalVariable *GV, CallInst *CI, uint64_t AllocSize, Constant *InitVal, const DataLayout &DL, TargetLibraryInfo *TLI)
This function takes the specified global variable, and transforms the program as if it always contain...
static bool collectSRATypes(DenseMap< uint64_t, GlobalPart > &Parts, GlobalVariable *GV, const DataLayout &DL)
Look at all uses of the global and determine which (offset, type) pairs it can be split into.
static bool valueIsOnlyUsedLocallyOrStoredToOneGlobal(const CallInst *CI, const GlobalVariable *GV)
Scan the use-list of GV checking to make sure that there are no complex uses of GV.
static bool OptimizeFunctions(Module &M, function_ref< TargetLibraryInfo &(Function &)> GetTLI, function_ref< TargetTransformInfo &(Function &)> GetTTI, function_ref< BlockFrequencyInfo &(Function &)> GetBFI, function_ref< DominatorTree &(Function &)> LookupDomTree, SmallPtrSetImpl< const Comdat * > &NotDiscardableComdats, function_ref< void(Function &F)> ChangedCFGCallback, function_ref< void(Function &F)> DeleteFnCallback)
static void RemoveAttribute(Function *F, Attribute::AttrKind A)
static cl::opt< int > ColdCCRelFreq("coldcc-rel-freq", cl::Hidden, cl::init(2), cl::desc("Maximum block frequency, expressed as a percentage of caller's " "entry frequency, for a call site to be considered cold for enabling" "coldcc"))
static bool hasChangeableCC(Function *F, ChangeableCCCacheTy &ChangeableCCCache)
static bool deleteIfDead(GlobalValue &GV, SmallPtrSetImpl< const Comdat * > &NotDiscardableComdats, function_ref< void(Function &)> DeleteFnCallback=nullptr)
static void RemovePreallocated(Function *F)
static bool processGlobal(GlobalValue &GV, function_ref< TargetTransformInfo &(Function &)> GetTTI, function_ref< TargetLibraryInfo &(Function &)> GetTLI, function_ref< DominatorTree &(Function &)> LookupDomTree)
Analyze the specified global variable and optimize it if possible.
static bool isColdCallSite(CallBase &CB, BlockFrequencyInfo &CallerBFI)
Return true if the block containing the call site has a BlockFrequency of less than ColdCCRelFreq% of...
static void transferSRADebugInfo(GlobalVariable *GV, GlobalVariable *NGV, uint64_t FragmentOffsetInBits, uint64_t FragmentSizeInBits, uint64_t VarSize)
Copy over the debug info for a variable to its SRA replacements.
static cl::opt< bool > EnableColdCCStressTest("enable-coldcc-stress-test", cl::desc("Enable stress test of coldcc by adding " "calling conv to all internal functions."), cl::init(false), cl::Hidden)
static bool OptimizeGlobalAliases(Module &M, SmallPtrSetImpl< const Comdat * > &NotDiscardableComdats)
static bool TryToShrinkGlobalToBoolean(GlobalVariable *GV, Constant *OtherVal)
At this point, we have learned that the only two values ever stored into GV are its initializer and O...
static void ChangeCalleesToFastCall(Function *F)
Walk all of the direct calls of the specified function, changing them to FastCC.
static bool hasMustTailCallers(Function *F)
static bool OptimizeEmptyGlobalCXXDtors(Function *CXAAtExitFn)
static bool OptimizeGlobalVars(Module &M, function_ref< TargetTransformInfo &(Function &)> GetTTI, function_ref< TargetLibraryInfo &(Function &)> GetTLI, function_ref< DominatorTree &(Function &)> LookupDomTree, SmallPtrSetImpl< const Comdat * > &NotDiscardableComdats)
static void allUsesOfLoadAndStores(GlobalVariable *GV, SmallVector< Value *, 4 > &Uses)
Get all the loads/store uses for global variable GV.
static bool mayHaveOtherReferences(GlobalValue &GV, const LLVMUsed &U)
static void changeCallSitesToColdCC(Function *F)
static AttributeList StripAttr(LLVMContext &C, AttributeList Attrs, Attribute::AttrKind A)
static bool hasInvokeCallers(Function *F)
static void setUsedInitializer(GlobalVariable &V, const SmallPtrSetImpl< GlobalValue * > &Init)
static bool OptimizeAwayTrappingUsesOfLoads(GlobalVariable *GV, Constant *LV, const DataLayout &DL, function_ref< TargetLibraryInfo &(Function &)> GetTLI)
The specified global has only one non-null value stored into it.
static bool isValidCandidateForColdCC(Function &F, function_ref< BlockFrequencyInfo &(Function &)> GetBFI, const std::vector< Function * > &AllCallsCold)
static bool optimizeGlobalsInModule(Module &M, const DataLayout &DL, function_ref< TargetLibraryInfo &(Function &)> GetTLI, function_ref< TargetTransformInfo &(Function &)> GetTTI, function_ref< BlockFrequencyInfo &(Function &)> GetBFI, function_ref< DominatorTree &(Function &)> LookupDomTree, function_ref< void(Function &F)> ChangedCFGCallback, function_ref< void(Function &F)> DeleteFnCallback)
static bool EvaluateStaticConstructor(Function *F, const DataLayout &DL, TargetLibraryInfo *TLI)
Evaluate static constructors in the function, if we can.
static bool CleanupConstantGlobalUsers(GlobalVariable *GV, const DataLayout &DL)
We just marked GV constant.
static bool isLeakCheckerRoot(GlobalVariable *GV)
Is this global variable possibly used by a leak checker as a root? If so, we might not really want to...
static bool forwardStoredOnceStore(GlobalVariable *GV, const StoreInst *StoredOnceStore, function_ref< DominatorTree &(Function &)> LookupDomTree)
static int compareNames(Constant *const *A, Constant *const *B)
static bool CleanupPointerRootUsers(GlobalVariable *GV, function_ref< TargetLibraryInfo &(Function &)> GetTLI)
This GV is a pointer root.
static bool isPointerValueDeadOnEntryToFunction(const Function *F, GlobalValue *GV, function_ref< DominatorTree &(Function &)> LookupDomTree)
static bool processInternalGlobal(GlobalVariable *GV, const GlobalStatus &GS, function_ref< TargetTransformInfo &(Function &)> GetTTI, function_ref< TargetLibraryInfo &(Function &)> GetTLI, function_ref< DominatorTree &(Function &)> LookupDomTree)
Analyze the specified global variable and optimize it if possible.
static bool hasUsesToReplace(GlobalAlias &GA, const LLVMUsed &U, bool &RenameTarget)
static bool OptimizeAwayTrappingUsesOfValue(Value *V, Constant *NewV)
static GlobalVariable * SRAGlobal(GlobalVariable *GV, const DataLayout &DL)
Perform scalar replacement of aggregates on the specified global variable.
static bool hasUseOtherThanLLVMUsed(GlobalAlias &GA, const LLVMUsed &U)
Module.h This file contains the declarations for the Module class.
FunctionAnalysisManager FAM
assert(ImpDefSCC.getReg()==AMDGPU::SCC &&ImpDefSCC.isDef())
This file defines the SmallPtrSet class.
This file defines the SmallVector class.
This file defines the 'Statistic' class, which is designed to be an easy way to expose various metric...
#define STATISTIC(VARNAME, DESC)
static SymbolRef::Type getType(const Symbol *Sym)
This defines the Use class.
Class for arbitrary precision integers.
This class represents a conversion between pointers from one address space to another.
an instruction to allocate memory on the stack
A container for analyses that lazily runs them and caches their results.
void clear(IRUnitT &IR, llvm::StringRef Name)
Clear any cached analysis results for a single unit of IR.
void invalidate(IRUnitT &IR, const PreservedAnalyses &PA)
Invalidate cached analyses for an IR unit.
PassT::Result & getResult(IRUnitT &IR, ExtraArgTs... ExtraArgs)
Get the result of an analysis pass for a given IR unit.
AttrKind
This enumeration lists the attributes that can be associated with parameters, function results,...
LLVM Basic Block Representation.
const Function * getParent() const
Return the enclosing method, or null if none.
static BinaryOperator * CreateNot(Value *Op, const Twine &Name="", Instruction *InsertBefore=nullptr)
Analysis pass which computes BlockFrequencyInfo.
BlockFrequencyInfo pass uses BlockFrequencyInfoImpl implementation to estimate IR basic block frequen...
BlockFrequency getBlockFreq(const BasicBlock *BB) const
getblockFreq - Return block frequency.
Represents analyses that only rely on functions' control flow.
Base class for all callable instructions (InvokeInst and CallInst) Holds everything related to callin...
void getOperandBundlesAsDefs(SmallVectorImpl< OperandBundleDef > &Defs) const
Return the list of operand bundles attached to this instruction as a vector of OperandBundleDefs.
bool isMustTailCall() const
Tests if this call site must be tail call optimized.
static CallBase * Create(CallBase *CB, ArrayRef< OperandBundleDef > Bundles, Instruction *InsertPt=nullptr)
Create a clone of CB with a different set of operand bundles and insert it before InsertPt.
Value * getCalledOperand() const
void setAttributes(AttributeList A)
Set the parameter attributes for this call.
Value * getArgOperand(unsigned i) const
void setArgOperand(unsigned i, Value *v)
void setCalledOperand(Value *V)
unsigned arg_size() const
AttributeList getAttributes() const
Return the parameter attributes for this call.
Function * getCaller()
Helper to get the caller (the parent function).
This class represents a function call, abstracting a target machine's calling convention.
bool isMustTailCall() const
Predicate getPredicate() const
Return the predicate for this instruction.
static Constant * get(ArrayType *T, ArrayRef< Constant * > V)
A constant value that is initialized with an expression using other constant values.
static Constant * getPointerBitCastOrAddrSpaceCast(Constant *C, Type *Ty)
Create a BitCast or AddrSpaceCast for a pointer type depending on the address space.
static Constant * getGetElementPtr(Type *Ty, Constant *C, ArrayRef< Constant * > IdxList, bool InBounds=false, std::optional< unsigned > InRangeIndex=std::nullopt, Type *OnlyIfReducedTy=nullptr)
Getelementptr form.
static Constant * getAddrSpaceCast(Constant *C, Type *Ty, bool OnlyIfReduced=false)
static ConstantInt * getTrue(LLVMContext &Context)
static Constant * get(Type *Ty, uint64_t V, bool IsSigned=false)
If Ty is a vector type, return a Constant with a splat of the given value.
static ConstantInt * getFalse(LLVMContext &Context)
static ConstantInt * getBool(LLVMContext &Context, bool V)
This is an important base class in LLVM.
const Constant * stripPointerCasts() const
void removeDeadConstantUsers() const
If there are any dead constant users dangling off of this constant, remove them.
static Constant * getNullValue(Type *Ty)
Constructor to create a '0' constant of arbitrary type.
bool isNullValue() const
Return true if this is the value that would be returned by getNullValue.
bool extractIfOffset(int64_t &Offset) const
If this is a constant offset, extract it.
static std::optional< DIExpression * > createFragmentExpression(const DIExpression *Expr, unsigned OffsetInBits, unsigned SizeInBits)
Create a DIExpression to describe one part of an aggregate variable that is fragmented across multipl...
static DIExpression * prependOpcodes(const DIExpression *Expr, SmallVectorImpl< uint64_t > &Ops, bool StackValue=false, bool EntryValue=false)
Prepend DIExpr with the given opcodes and optionally turn it into a stack value.
A pair of DIGlobalVariable and DIExpression.
uint64_t getSizeInBits() const
Base class for variables.
This class represents an Operation in the Expression.
A parsed version of the target data layout string in and methods for querying it.
std::pair< iterator, bool > try_emplace(KeyT &&Key, Ts &&... Args)
bool erase(const KeyT &Val)
std::pair< iterator, bool > insert(const std::pair< KeyT, ValueT > &KV)
Analysis pass which computes a DominatorTree.
Concrete subclass of DominatorTreeBase that is used to compute a normal dominator tree.
This class evaluates LLVM IR, producing the Constant representing each SSA instruction.
DenseMap< GlobalVariable *, Constant * > getMutatedInitializers() const
bool EvaluateFunction(Function *F, Constant *&RetVal, const SmallVectorImpl< Constant * > &ActualArgs)
Evaluate a call to function F, returning true if successful, false if we can't evaluate it.
const SmallPtrSetImpl< GlobalVariable * > & getInvariants() const
const BasicBlock & getEntryBlock() const
Intrinsic::ID getIntrinsicID() const LLVM_READONLY
getIntrinsicID - This method returns the ID number of the specified function, or Intrinsic::not_intri...
LLVMContext & getContext() const
getContext - Return a reference to the LLVMContext associated with this function.
an instruction for type-safe pointer arithmetic to access elements of arrays and structs
const Constant * getAliasee() const
MaybeAlign getAlign() const
Returns the alignment of the given variable or function.
void setAlignment(Align Align)
Sets the alignment attribute of the GlobalObject.
PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM)
bool isImplicitDSOLocal() const
bool isDeclaration() const
Return true if the primary definition of this global value is outside of the current translation unit...
LinkageTypes getLinkage() const
void setUnnamedAddr(UnnamedAddr Val)
bool hasLocalLinkage() const
bool hasPrivateLinkage() const
const Comdat * getComdat() const
ThreadLocalMode getThreadLocalMode() const
void setLinkage(LinkageTypes LT)
unsigned getAddressSpace() const
Module * getParent()
Get the module that this global value is contained inside of...
void eraseFromParent()
This method unlinks 'this' from the containing module and deletes it.
PointerType * getType() const
Global values are always pointers.
static bool isInterposableLinkage(LinkageTypes Linkage)
Whether the definition of this global may be replaced by something non-equivalent at link time.
bool hasGlobalUnnamedAddr() const
UnnamedAddr getUnnamedAddr() const
static bool isDiscardableIfUnused(LinkageTypes Linkage)
Whether the definition of this global may be discarded if it is not used in its compilation unit.
@ InternalLinkage
Rename collisions when linking (static functions).
@ AppendingLinkage
Special purpose, only applies to global arrays.
Type * getValueType() const
const Constant * getInitializer() const
getInitializer - Return the initializer for this global variable.
void setInitializer(Constant *InitVal)
setInitializer - Sets the initializer for this global variable, removing any existing initializer if ...
bool isExternallyInitialized() const
void setConstant(bool Val)
void copyAttributesFrom(const GlobalVariable *Src)
copyAttributesFrom - copy all additional attributes (those not needed to create a GlobalVariable) fro...
void getDebugInfo(SmallVectorImpl< DIGlobalVariableExpression * > &GVs) const
Fill the vector with all debug info attachements.
bool isConstant() const
If the value is a global constant, its value is immutable throughout the runtime execution of the pro...
void eraseFromParent()
eraseFromParent - This method unlinks 'this' from the containing module and deletes it.
void addDebugInfo(DIGlobalVariableExpression *GV)
Attach a DIGlobalVariableExpression.
This instruction compares its operands according to the predicate given to the constructor.
AllocaInst * CreateAlloca(Type *Ty, unsigned AddrSpace, Value *ArraySize=nullptr, const Twine &Name="")
CallInst * CreateStackSave(const Twine &Name="")
Create a call to llvm.stacksave.
CallInst * CreateMemSet(Value *Ptr, Value *Val, uint64_t Size, MaybeAlign Align, bool isVolatile=false, MDNode *TBAATag=nullptr, MDNode *ScopeTag=nullptr, MDNode *NoAliasTag=nullptr)
Create and insert a memset to the specified pointer and the specified value.
CallInst * CreateStackRestore(Value *Ptr, const Twine &Name="")
Create a call to llvm.stackrestore.
void SetInsertPoint(BasicBlock *TheBB)
This specifies that created instructions should be appended to the end of the specified block.
This provides a uniform API for creating instructions and inserting them into a basic block: either a...
An analysis over an "outer" IR unit that provides access to an analysis manager over an "inner" IR un...
const DebugLoc & getDebugLoc() const
Return the debug location for this node as a DebugLoc.
const BasicBlock * getParent() const
InstListType::iterator eraseFromParent()
This method unlinks 'this' from the containing basic block and deletes it.
const Function * getFunction() const
Return the function this instruction belongs to.
const Instruction * getNextNonDebugInstruction(bool SkipPseudoOp=false) const
Return a pointer to the next non-debug instruction in the same basic block as 'this',...
void setDebugLoc(DebugLoc Loc)
Set the debug location information for this instruction.
This is an important class for using LLVM in a threaded context.
An instruction for reading from memory.
AtomicOrdering getOrdering() const
Returns the ordering constraint of this load instruction.
SyncScope::ID getSyncScopeID() const
Returns the synchronization scope ID of this load instruction.
LLVMContext & getContext() const
This is the common base class for memset/memcpy/memmove.
This class wraps the llvm.memset and llvm.memset.inline intrinsics.
This class wraps the llvm.memcpy/memmove intrinsics.
A Module instance is used to store all the information related to an LLVM module.
void insertGlobalVariable(GlobalVariable *GV)
Insert global variable GV at the end of the global variable list and take ownership.
const DataLayout & getDataLayout() const
Get the data layout for the module's target platform.
unsigned getAddressSpace() const
Return the address space of the Pointer type.
A set of analyses that are preserved following a run of a transformation pass.
static PreservedAnalyses none()
Convenience factory function for the empty preserved set.
static PreservedAnalyses all()
Construct a special preserved set that preserves all passes.
void preserveSet()
Mark an analysis set as preserved.
void preserve()
Mark an analysis as preserved.
static SelectInst * Create(Value *C, Value *S1, Value *S2, const Twine &NameStr="", Instruction *InsertBefore=nullptr, Instruction *MDFrom=nullptr)
A templated base class for SmallPtrSet which provides the typesafe interface that is common across al...
bool erase(PtrType Ptr)
erase - If the set contains the specified pointer, remove it and return true, otherwise return false.
size_type count(ConstPtrType Ptr) const
count - Return 1 if the specified pointer is in the set, 0 otherwise.
std::pair< iterator, bool > insert(PtrType Ptr)
Inserts Ptr if and only if there is no element in the container equal to Ptr.
SmallPtrSet - This class implements a set which is optimized for holding SmallSize or less elements.
void reserve(size_type N)
iterator erase(const_iterator CI)
void push_back(const T &Elt)
This is a 'vector' (really, a variable-sized array), optimized for the case when the array is small.
An instruction for storing to memory.
Value * getValueOperand()
bool starts_with(StringRef Prefix) const
Check if this string starts with the given Prefix.
int compare(StringRef RHS) const
compare - Compare two strings; the result is negative, zero, or positive if this string is lexicograp...
Class to represent struct types.
ArrayRef< Type * > elements() const
bool isOpaque() const
Return true if this is a type with an identity that has no body specified yet.
Analysis pass providing the TargetTransformInfo.
Analysis pass providing the TargetLibraryInfo.
Provides information about what library functions are available for the current target.
Target - Wrapper for Target specific information.
Twine - A lightweight data structure for efficiently representing the concatenation of temporary valu...
The instances of the Type class are immutable: once they are created, they are never changed.
bool isVectorTy() const
True if this is an instance of VectorType.
bool isPointerTy() const
True if this is an instance of PointerType.
static IntegerType * getInt1Ty(LLVMContext &C)
unsigned getPointerAddressSpace() const
Get the address space of this pointer or pointer vector type.
@ ScalableVectorTyID
Scalable SIMD vector type.
@ FixedVectorTyID
Fixed width SIMD vector type.
bool isSingleValueType() const
Return true if the type is a valid type for a register in codegen.
static IntegerType * getInt8Ty(LLVMContext &C)
bool isFloatingPointTy() const
Return true if this is one of the floating-point types.
bool isScalableTy() const
Return true if this is a type whose size is a known multiple of vscale.
TypeID getTypeID() const
Return the type id for the type.
static UndefValue * get(Type *T)
Static factory methods - Return an 'undef' object of the specified type.
A Use represents the edge between a Value definition and its users.
User * getUser() const
Returns the User that contains this Use.
Value * getOperand(unsigned i) const
LLVM Value Representation.
Type * getType() const
All values are typed, get the type of this value.
const Value * stripAndAccumulateConstantOffsets(const DataLayout &DL, APInt &Offset, bool AllowNonInbounds, bool AllowInvariantGroup=false, function_ref< bool(Value &Value, APInt &Offset)> ExternalAnalysis=nullptr) const
Accumulate the constant offset this value has compared to a base pointer.
bool hasOneUse() const
Return true if there is exactly one use of this value.
void replaceAllUsesWith(Value *V)
Change all uses of this to point to a new Value.
iterator_range< user_iterator > users()
const Value * stripPointerCasts() const
Strip off pointer casts, all-zero GEPs and address space casts.
LLVMContext & getContext() const
All values hold a context through their type.
user_iterator_impl< User > user_iterator
StringRef getName() const
Return a constant reference to the value's name.
void takeName(Value *V)
Transfer the name from V to this value.
This class represents zero extension of integer types.
An efficient, type-erasing, non-owning reference to a callable.
self_iterator getIterator()
NodeTy * getNextNode()
Get the next node, or nullptr for the list tail.
A range adaptor for a pair of iterators.
This provides a very simple, boring adaptor for a begin and end iterator into a range type.
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
@ Cold
Attempts to make code in the caller as efficient as possible under the assumption that the call is no...
@ X86_ThisCall
Similar to X86_StdCall.
@ Fast
Attempts to make calls as fast as possible (e.g.
@ C
The default llvm calling convention, compatible with C.
initializer< Ty > init(const Ty &Val)
This is an optimization pass for GlobalISel generic memory operations.
Constant * getInitialValueOfAllocation(const Value *V, const TargetLibraryInfo *TLI, Type *Ty)
If this is a call to an allocation function that initializes memory to a fixed value,...
bool RecursivelyDeleteTriviallyDeadInstructions(Value *V, const TargetLibraryInfo *TLI=nullptr, MemorySSAUpdater *MSSAU=nullptr, std::function< void(Value *)> AboutToDeleteCallback=std::function< void(Value *)>())
If the specified value is a trivially dead instruction, delete it.
bool isRemovableAlloc(const CallBase *V, const TargetLibraryInfo *TLI)
Return true if this is a call to an allocation function that does not have side effects that we are r...
const Value * getLoadStorePointerOperand(const Value *V)
A helper function that returns the pointer operand of a load or store instruction.
void append_range(Container &C, Range &&R)
Wrapper function to append range R to container C.
const Value * getUnderlyingObject(const Value *V, unsigned MaxLookup=6)
This method strips off any GEP address adjustments and pointer casts from the specified value,...
iterator_range< early_inc_iterator_impl< detail::IterOfRange< RangeT > > > make_early_inc_range(RangeT &&Range)
Make a range that does early increment to allow mutation of the underlying range without disrupting i...
Constant * ConstantFoldConstant(const Constant *C, const DataLayout &DL, const TargetLibraryInfo *TLI=nullptr)
ConstantFoldConstant - Fold the constant using the specified DataLayout.
bool isInstructionTriviallyDead(Instruction *I, const TargetLibraryInfo *TLI=nullptr)
Return true if the result produced by the instruction is not used, and the instruction will return.
bool getObjectSize(const Value *Ptr, uint64_t &Size, const DataLayout &DL, const TargetLibraryInfo *TLI, ObjectSizeOpts Opts={})
Compute the size of the object pointed by Ptr.
bool isSafeToDestroyConstant(const Constant *C)
It is safe to destroy a constant iff it is only used by constants itself.
Align getOrEnforceKnownAlignment(Value *V, MaybeAlign PrefAlign, const DataLayout &DL, const Instruction *CxtI=nullptr, AssumptionCache *AC=nullptr, const DominatorTree *DT=nullptr)
Try to ensure that the alignment of V is at least PrefAlign bytes.
bool optimizeGlobalCtorsList(Module &M, function_ref< bool(uint32_t, Function *)> ShouldRemove)
Call "ShouldRemove" for every entry in M's global_ctor list and remove the entries for which it retur...
void sort(IteratorTy Start, IteratorTy End)
bool NullPointerIsDefined(const Function *F, unsigned AS=0)
Check whether null pointer dereferencing is considered undefined behavior for a given function or an ...
raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.
bool none_of(R &&Range, UnaryPredicate P)
Provide wrappers to std::none_of which take ranges instead of having to pass begin/end explicitly.
Constant * ConstantFoldLoadFromConst(Constant *C, Type *Ty, const APInt &Offset, const DataLayout &DL)
Extract value of C at the given Offset reinterpreted as Ty.
Constant * ConstantFoldLoadFromUniformValue(Constant *C, Type *Ty)
If C is a uniform value where all bits are the same (either all zero, all ones, all undef or all pois...
raw_fd_ostream & errs()
This returns a reference to a raw_ostream for standard error.
Constant * ConstantFoldInstruction(Instruction *I, const DataLayout &DL, const TargetLibraryInfo *TLI=nullptr)
ConstantFoldInstruction - Try to constant fold the specified instruction.
bool RecursivelyDeleteTriviallyDeadInstructionsPermissive(SmallVectorImpl< WeakTrackingVH > &DeadInsts, const TargetLibraryInfo *TLI=nullptr, MemorySSAUpdater *MSSAU=nullptr, std::function< void(Value *)> AboutToDeleteCallback=std::function< void(Value *)>())
Same functionality as RecursivelyDeleteTriviallyDeadInstructions, but allow instructions that are not...
auto count_if(R &&Range, UnaryPredicate P)
Wrapper function around std::count_if to count the number of times an element satisfying a given pred...
bool isAllocationFn(const Value *V, const TargetLibraryInfo *TLI)
Tests if a value is a call or invoke to a library function that allocates or reallocates memory (eith...
bool is_contained(R &&Range, const E &Element)
Returns true if Element is found in Range.
Align commonAlignment(Align A, uint64_t Offset)
Returns the alignment that satisfies both alignments.
void array_pod_sort(IteratorTy Start, IteratorTy End)
array_pod_sort - This sorts an array with the specified start and end extent.
bool removeUnreachableBlocks(Function &F, DomTreeUpdater *DTU=nullptr, MemorySSAUpdater *MSSAU=nullptr)
Remove all blocks that can not be reached from the function's entry.
Type * getLoadStoreType(Value *I)
A helper function that returns the type of a load or store instruction.
GlobalVariable * collectUsedGlobalVariables(const Module &M, SmallVectorImpl< GlobalValue * > &Vec, bool CompilerUsed)
Given "llvm.used" or "llvm.compiler.used" as a global name, collect the initializer elements of that ...
Part of the global at a specific offset, which is only accessed through loads and stores with the giv...
This struct is a compact representation of a valid (non-zero power of two) alignment.
As we analyze each global, keep track of some information about it.
@ InitializerStored
This global is stored to, but the only thing stored is the constant it was initialized with.
@ StoredOnce
This global is stored to, but only its initializer and one other value is ever stored to it.
static bool analyzeGlobal(const Value *V, GlobalStatus &GS)
Look at all uses of the global and fill in the GlobalStatus structure.
Various options to control the behavior of getObjectSize.
Function object to check whether the first component of a container supported by std::get (like std::...