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LLVM 20.0.0git
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#include "llvm/Transforms/IPO/GlobalOpt.h"#include "llvm/ADT/DenseMap.h"#include "llvm/ADT/STLExtras.h"#include "llvm/ADT/SmallPtrSet.h"#include "llvm/ADT/SmallVector.h"#include "llvm/ADT/Statistic.h"#include "llvm/ADT/Twine.h"#include "llvm/ADT/iterator_range.h"#include "llvm/Analysis/BlockFrequencyInfo.h"#include "llvm/Analysis/ConstantFolding.h"#include "llvm/Analysis/MemoryBuiltins.h"#include "llvm/Analysis/TargetLibraryInfo.h"#include "llvm/Analysis/TargetTransformInfo.h"#include "llvm/Analysis/ValueTracking.h"#include "llvm/BinaryFormat/Dwarf.h"#include "llvm/IR/Attributes.h"#include "llvm/IR/BasicBlock.h"#include "llvm/IR/CallingConv.h"#include "llvm/IR/Constant.h"#include "llvm/IR/Constants.h"#include "llvm/IR/DataLayout.h"#include "llvm/IR/DebugInfoMetadata.h"#include "llvm/IR/DerivedTypes.h"#include "llvm/IR/Dominators.h"#include "llvm/IR/Function.h"#include "llvm/IR/GlobalAlias.h"#include "llvm/IR/GlobalValue.h"#include "llvm/IR/GlobalVariable.h"#include "llvm/IR/IRBuilder.h"#include "llvm/IR/InstrTypes.h"#include "llvm/IR/Instruction.h"#include "llvm/IR/Instructions.h"#include "llvm/IR/IntrinsicInst.h"#include "llvm/IR/Module.h"#include "llvm/IR/Operator.h"#include "llvm/IR/Type.h"#include "llvm/IR/Use.h"#include "llvm/IR/User.h"#include "llvm/IR/Value.h"#include "llvm/IR/ValueHandle.h"#include "llvm/Support/AtomicOrdering.h"#include "llvm/Support/Casting.h"#include "llvm/Support/CommandLine.h"#include "llvm/Support/Debug.h"#include "llvm/Support/ErrorHandling.h"#include "llvm/Support/raw_ostream.h"#include "llvm/Transforms/IPO.h"#include "llvm/Transforms/Utils/CtorUtils.h"#include "llvm/Transforms/Utils/Evaluator.h"#include "llvm/Transforms/Utils/GlobalStatus.h"#include "llvm/Transforms/Utils/Local.h"#include <cassert>#include <cstdint>#include <optional>#include <utility>#include <vector>Go to the source code of this file.
Classes | |
| struct | GlobalPart |
| Part of the global at a specific offset, which is only accessed through loads and stores with the given type. More... | |
Macros | |
| #define | DEBUG_TYPE "globalopt" |
Typedefs | |
| using | ChangeableCCCacheTy = SmallDenseMap< Function *, bool, 8 > |
Functions | |
| STATISTIC (NumMarked, "Number of globals marked constant") | |
| STATISTIC (NumUnnamed, "Number of globals marked unnamed_addr") | |
| STATISTIC (NumSRA, "Number of aggregate globals broken into scalars") | |
| STATISTIC (NumSubstitute,"Number of globals with initializers stored into them") | |
| STATISTIC (NumDeleted, "Number of globals deleted") | |
| STATISTIC (NumGlobUses, "Number of global uses devirtualized") | |
| STATISTIC (NumLocalized, "Number of globals localized") | |
| STATISTIC (NumShrunkToBool, "Number of global vars shrunk to booleans") | |
| STATISTIC (NumFastCallFns, "Number of functions converted to fastcc") | |
| STATISTIC (NumCtorsEvaluated, "Number of static ctors evaluated") | |
| STATISTIC (NumNestRemoved, "Number of nest attributes removed") | |
| STATISTIC (NumAliasesResolved, "Number of global aliases resolved") | |
| STATISTIC (NumAliasesRemoved, "Number of global aliases eliminated") | |
| STATISTIC (NumCXXDtorsRemoved, "Number of global C++ destructors removed") | |
| STATISTIC (NumAtExitRemoved, "Number of atexit handlers removed") | |
| STATISTIC (NumInternalFunc, "Number of internal functions") | |
| STATISTIC (NumColdCC, "Number of functions marked coldcc") | |
| STATISTIC (NumIFuncsResolved, "Number of statically resolved IFuncs") | |
| STATISTIC (NumIFuncsDeleted, "Number of IFuncs removed") | |
| STATISTIC (NumGlobalArraysPadded, "Number of global arrays padded to alignment boundary") | |
| 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 eliminate the stores to it. | |
| 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 store and the chain of computation that feeds the store. | |
| static bool | CleanupPointerRootUsers (GlobalVariable *GV, function_ref< TargetLibraryInfo &(Function &)> GetTLI) |
| This GV is a pointer root. | |
| static bool | CleanupConstantGlobalUsers (GlobalVariable *GV, const DataLayout &DL) |
| We just marked GV constant. | |
| 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 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 GlobalVariable * | SRAGlobal (GlobalVariable *GV, const DataLayout &DL) |
| Perform scalar replacement of aggregates on the specified global variable. | |
| 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. | |
| 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 void | allUsesOfLoadAndStores (GlobalVariable *GV, SmallVector< Value *, 4 > &Uses) |
Get all the loads/store uses for global variable GV. | |
| static bool | OptimizeAwayTrappingUsesOfValue (Value *V, Constant *NewV) |
| 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 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 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 contained the result of the specified malloc. | |
| 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 | 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 program to use global memory instead of heap allocated memory. | |
| static bool | optimizeOnceStoredGlobal (GlobalVariable *GV, Value *StoredOnceVal, const DataLayout &DL, function_ref< TargetLibraryInfo &(Function &)> GetTLI) |
| 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 OtherVal. | |
| static bool | deleteIfDead (GlobalValue &GV, SmallPtrSetImpl< const Comdat * > &NotDiscardableComdats, function_ref< void(Function &)> DeleteFnCallback=nullptr) |
| static bool | isPointerValueDeadOnEntryToFunction (const Function *F, GlobalValue *GV, function_ref< DominatorTree &(Function &)> LookupDomTree) |
| static bool | forwardStoredOnceStore (GlobalVariable *GV, const StoreInst *StoredOnceStore, 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 | 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 void | ChangeCalleesToFastCall (Function *F) |
| Walk all of the direct calls of the specified function, changing them to FastCC. | |
| static AttributeList | StripAttr (LLVMContext &C, AttributeList Attrs, Attribute::AttrKind A) |
| static void | RemoveAttribute (Function *F, Attribute::AttrKind A) |
| static bool | hasChangeableCCImpl (Function *F) |
| Return true if this is a calling convention that we'd like to change. | |
| static bool | hasChangeableCC (Function *F, ChangeableCCCacheTy &ChangeableCCCache) |
| static bool | isColdCallSite (CallBase &CB, BlockFrequencyInfo &CallerBFI) |
| Return true if the block containing the call site has a BlockFrequency of less than ColdCCRelFreq% of the entry block. | |
| static bool | isValidCandidateForColdCC (Function &F, function_ref< BlockFrequencyInfo &(Function &)> GetBFI, const std::vector< Function * > &AllCallsCold) |
| static void | changeCallSitesToColdCC (Function *F) |
| static bool | hasOnlyColdCalls (Function &F, function_ref< BlockFrequencyInfo &(Function &)> GetBFI, ChangeableCCCacheTy &ChangeableCCCache) |
| static bool | hasMustTailCallers (Function *F) |
| static bool | hasInvokeCallers (Function *F) |
| static void | RemovePreallocated (Function *F) |
| 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 bool | callInstIsMemcpy (CallInst *CI) |
| static bool | destArrayCanBeWidened (CallInst *CI) |
| static GlobalVariable * | widenGlobalVariable (GlobalVariable *OldVar, Function *F, unsigned NumBytesToPad, unsigned NumBytesToCopy) |
| static void | widenDestArray (CallInst *CI, const unsigned NumBytesToPad, const unsigned NumBytesToCopy, ConstantDataArray *SourceDataArray) |
| static bool | tryWidenGlobalArrayAndDests (Function *F, GlobalVariable *SourceVar, const unsigned NumBytesToPad, const unsigned NumBytesToCopy, ConstantInt *BytesToCopyOp, ConstantDataArray *SourceDataArray) |
| static bool | tryWidenGlobalArraysUsedByMemcpy (GlobalVariable *GV, function_ref< TargetTransformInfo &(Function &)> GetTTI) |
| 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 bool | EvaluateStaticConstructor (Function *F, const DataLayout &DL, TargetLibraryInfo *TLI) |
| Evaluate static constructors in the function, if we can. | |
| static int | compareNames (Constant *const *A, Constant *const *B) |
| static void | setUsedInitializer (GlobalVariable &V, const SmallPtrSetImpl< GlobalValue * > &Init) |
| static bool | hasUseOtherThanLLVMUsed (GlobalAlias &GA, const LLVMUsed &U) |
| static bool | mayHaveOtherReferences (GlobalValue &GV, const LLVMUsed &U) |
| static bool | hasUsesToReplace (GlobalAlias &GA, const LLVMUsed &U, bool &RenameTarget) |
| static bool | OptimizeGlobalAliases (Module &M, SmallPtrSetImpl< const Comdat * > &NotDiscardableComdats) |
| static Function * | FindAtExitLibFunc (Module &M, function_ref< TargetLibraryInfo &(Function &)> GetTLI, LibFunc Func) |
| Returns whether the given function is an empty C destructor or atexit handler 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 | IsEmptyAtExitFunction (const Function &Fn) |
| static bool | OptimizeEmptyGlobalAtExitDtors (Function *CXAAtExitFn, bool isCXX) |
| static Function * | hasSideeffectFreeStaticResolution (GlobalIFunc &IF) |
| Find IFuncs that have resolvers that always point at the same statically known and replace their callers with a direct static call bool | OptimizeStaticIFuncs (Module &M) |
| static bool | DeleteDeadIFuncs (Module &M, SmallPtrSetImpl< const Comdat * > &NotDiscardableComdats) |
| 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) |
Variables | |
| 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 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")) |
| Find IFuncs that have resolvers that always point at the same statically known | callee |
| #define DEBUG_TYPE "globalopt" |
Definition at line 74 of file GlobalOpt.cpp.
| using ChangeableCCCacheTy = SmallDenseMap<Function *, bool, 8> |
Definition at line 1724 of file GlobalOpt.cpp.
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Get all the loads/store uses for global variable GV.
Definition at line 739 of file GlobalOpt.cpp.
References assert(), llvm::SmallVectorBase< Size_T >::empty(), P, llvm::SmallVectorImpl< T >::pop_back_val(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), and Uses.
Referenced by OptimizeGlobalAddressOfAllocation().
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Return true if all uses of any loads from GV will trap if the loaded value is null.
Note that this also permits comparisons of the loaded value against null, as a special case.
Definition at line 709 of file GlobalOpt.cpp.
References AllUsesOfValueWillTrapIfNull(), llvm::SmallVectorBase< Size_T >::empty(), P, llvm::SmallVectorImpl< T >::pop_back_val(), and llvm::SmallVectorTemplateBase< T, bool >::push_back().
Referenced by tryToOptimizeStoreOfAllocationToGlobal().
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Return true if all users of the specified value will trap if the value is dynamically null.
PHIs keeps track of any phi nodes we've seen to avoid reprocessing them.
Definition at line 655 of file GlobalOpt.cpp.
References AllUsesOfValueWillTrapIfNull(), assert(), I, II, llvm::SmallPtrSetImpl< PtrType >::insert(), and llvm::NullPointerIsDefined().
Referenced by allUsesOfLoadedValueWillTrapIfNull(), and AllUsesOfValueWillTrapIfNull().
Definition at line 2034 of file GlobalOpt.cpp.
References F, and llvm::CallBase::getCalledFunction().
Referenced by tryWidenGlobalArrayAndDests(), and tryWidenGlobalArraysUsedByMemcpy().
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Walk all of the direct calls of the specified function, changing them to FastCC.
Definition at line 1662 of file GlobalOpt.cpp.
References F, and llvm::CallingConv::Fast.
Referenced by OptimizeFunctions().
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Definition at line 1771 of file GlobalOpt.cpp.
References llvm::CallingConv::Cold, and F.
Referenced by OptimizeFunctions().
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We just marked GV constant.
Loop over all users of the global, cleaning up the obvious ones. This is largely just a quick scan over the use list to clean up the easy and obvious cruft. This returns true if it made a change.
Definition at line 272 of file GlobalOpt.cpp.
References llvm::append_range(), llvm::ConstantFoldLoadFromConst(), llvm::ConstantFoldLoadFromUniformValue(), DL, llvm::SmallVectorBase< Size_T >::empty(), GEP, llvm::GlobalVariable::getInitializer(), llvm::Value::getType(), llvm::getUnderlyingObject(), I, II, llvm::SmallPtrSetImpl< PtrType >::insert(), MI, llvm::Offset, llvm::SmallVectorImpl< T >::pop_back_val(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::RecursivelyDeleteTriviallyDeadInstructionsPermissive(), llvm::Constant::removeDeadConstantUsers(), llvm::Value::stripAndAccumulateConstantOffsets(), and llvm::Value::users().
Referenced by OptimizeAwayTrappingUsesOfLoads(), and processInternalGlobal().
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This GV is a pointer root.
Loop over all users of the global and clean up any that obviously don't assign the global a value that isn't dynamically allocated.
Definition at line 194 of file GlobalOpt.cpp.
References llvm::append_range(), llvm::SmallVectorBase< Size_T >::empty(), I, llvm::isAllocationFn(), llvm::GlobalVariable::isConstant(), IsSafeComputationToRemove(), llvm::SmallVectorImpl< T >::pop_back_val(), llvm::Constant::removeDeadConstantUsers(), and llvm::Value::users().
Referenced by OptimizeAwayTrappingUsesOfLoads(), and processInternalGlobal().
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Look at all uses of the global and determine which (offset, type) pairs it can be split into.
Definition at line 351 of file GlobalOpt.cpp.
References llvm::CallingConv::C, llvm::ConstantFoldLoadFromConst(), llvm::dbgs(), DL, llvm::SmallVectorBase< Size_T >::empty(), GEP, llvm::GlobalVariable::getInitializer(), llvm::getLoadStorePointerOperand(), llvm::getLoadStoreType(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::isSafeToDestroyConstant(), llvm::Type::isScalableTy(), LLVM_DEBUG, llvm::Offset, llvm::SmallVectorImpl< T >::pop_back_val(), Ptr, llvm::SmallVectorTemplateBase< T, bool >::push_back(), and llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::try_emplace().
Referenced by SRAGlobal().
Definition at line 2261 of file GlobalOpt.cpp.
References llvm::StringRef::compare(), llvm::Value::getName(), and llvm::Value::stripPointerCasts().
Referenced by setUsedInitializer().
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Walk the use list of V, constant folding all of the instructions that are foldable.
Definition at line 893 of file GlobalOpt.cpp.
References llvm::ConstantFoldInstruction(), DL, I, and llvm::isInstructionTriviallyDead().
Referenced by OptimizeGlobalAddressOfAllocation().
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Definition at line 2633 of file GlobalOpt.cpp.
References deleteIfDead(), and llvm::make_early_inc_range().
Referenced by optimizeGlobalsInModule().
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Definition at line 1313 of file GlobalOpt.cpp.
References llvm::CallingConv::C, llvm::SmallPtrSetImpl< PtrType >::count(), llvm::dbgs(), llvm::GlobalValue::eraseFromParent(), F, llvm::GlobalValue::getComdat(), llvm::GlobalValue::hasLocalLinkage(), llvm::GlobalValue::isDeclaration(), llvm::GlobalValue::isDiscardableIfUnused(), LLVM_DEBUG, llvm::Constant::removeDeadConstantUsers(), llvm::ReplaceableMetadataImpl::SalvageDebugInfo(), and llvm::Value::use_empty().
Referenced by DeleteDeadIFuncs(), OptimizeFunctions(), OptimizeGlobalAliases(), and OptimizeGlobalVars().
Definition at line 2045 of file GlobalOpt.cpp.
References llvm::CallBase::getArgOperand().
Referenced by tryWidenGlobalArrayAndDests(), and tryWidenGlobalArraysUsedByMemcpy().
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Evaluate static constructors in the function, if we can.
Return true if we can, false otherwise.
Definition at line 2233 of file GlobalOpt.cpp.
References llvm::dbgs(), DL, llvm::Evaluator::EvaluateFunction(), F, llvm::Evaluator::getInvariants(), llvm::Evaluator::getMutatedInitializers(), LLVM_DEBUG, and llvm::GlobalVariable::setConstant().
Referenced by optimizeGlobalsInModule().
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Definition at line 2496 of file GlobalOpt.cpp.
References F.
Referenced by optimizeGlobalsInModule().
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Definition at line 1413 of file GlobalOpt.cpp.
References llvm::DominatorTree::dominates(), llvm::SmallVectorBase< Size_T >::empty(), F, llvm::Instruction::getFunction(), llvm::Value::getType(), llvm::StoreInst::getValueOperand(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), and llvm::Value::users().
Referenced by processInternalGlobal().
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Definition at line 1725 of file GlobalOpt.cpp.
References F, hasChangeableCCImpl(), and llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::try_emplace().
Referenced by hasOnlyColdCalls(), and OptimizeFunctions().
Return true if this is a calling convention that we'd like to change.
The idea here is that we don't want to mess with the convention if the user explicitly requested something with performance implications like coldcc, GHC, or anyregcc.
Definition at line 1692 of file GlobalOpt.cpp.
References llvm::CallingConv::C, CC, F, llvm::CallInst::isMustTailCall(), and llvm::CallingConv::X86_ThisCall.
Referenced by hasChangeableCC().
Definition at line 1815 of file GlobalOpt.cpp.
References assert(), F, and llvm::CallBase::isMustTailCall().
Referenced by OptimizeFunctions().
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Definition at line 1783 of file GlobalOpt.cpp.
References F, llvm::Function::getIntrinsicID(), hasChangeableCC(), llvm::GlobalValue::hasLocalLinkage(), I, isColdCallSite(), and llvm::Intrinsic::not_intrinsic.
Referenced by OptimizeFunctions().
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Definition at line 2588 of file GlobalOpt.cpp.
References llvm::any_of(), llvm::BasicBlock::getTerminator(), and I.
Referenced by OptimizeStaticIFuncs().
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Definition at line 2363 of file GlobalOpt.cpp.
References assert(), llvm::Value::hasOneUse(), and llvm::Value::use_empty().
Referenced by hasUsesToReplace().
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Definition at line 2386 of file GlobalOpt.cpp.
References llvm::GlobalAlias::getAliasee(), hasUseOtherThanLLVMUsed(), llvm::GlobalValue::isWeakForLinker(), mayHaveOtherReferences(), and llvm::Constant::stripPointerCasts().
Referenced by OptimizeGlobalAliases().
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Return true if the block containing the call site has a BlockFrequency of less than ColdCCRelFreq% of the entry block.
Definition at line 1735 of file GlobalOpt.cpp.
References ColdCCRelFreq, llvm::BlockFrequencyInfo::getBlockFreq(), llvm::CallBase::getCaller(), llvm::Function::getEntryBlock(), and llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent().
Referenced by hasOnlyColdCalls(), and isValidCandidateForColdCC().
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Definition at line 2527 of file GlobalOpt.cpp.
References llvm::Function::getEntryBlock(), I, and llvm::GlobalValue::isDeclaration().
Referenced by OptimizeEmptyGlobalAtExitDtors().
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Is this global variable possibly used by a leak checker as a root? If so, we might not really want to eliminate the stores to it.
Definition at line 113 of file GlobalOpt.cpp.
References llvm::Type::ArrayTyID, llvm::StructType::elements(), llvm::Type::FixedVectorTyID, llvm::Type::getTypeID(), llvm::GlobalValue::getValueType(), llvm::GlobalValue::hasPrivateLinkage(), llvm::StructType::isOpaque(), llvm::isPointerTy(), llvm::Type::PointerTyID, llvm::Type::ScalableVectorTyID, and llvm::Type::StructTyID.
Referenced by OptimizeAwayTrappingUsesOfLoads(), and processInternalGlobal().
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Definition at line 1344 of file GlobalOpt.cpp.
References assert(), DL, llvm::DominatorTree::dominates(), F, llvm::GlobalValue::getDataLayout(), getType(), llvm::StoreInst::getValueOperand(), I, llvm::none_of(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorBase< Size_T >::size(), and llvm::Value::users().
Referenced by processInternalGlobal().
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Given a value that is stored to a global but never read, determine whether it's safe to remove the store and the chain of computation that feeds the store.
Definition at line 163 of file GlobalOpt.cpp.
References GEP, I, and llvm::isAllocationFn().
Referenced by CleanupPointerRootUsers().
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Definition at line 1749 of file GlobalOpt.cpp.
References F, llvm::ilist_detail::node_parent_access< NodeTy, ParentTy >::getParent(), llvm::is_contained(), and isColdCallSite().
Referenced by OptimizeFunctions().
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Definition at line 2379 of file GlobalOpt.cpp.
References llvm::GlobalValue::hasLocalLinkage().
Referenced by hasUsesToReplace(), and OptimizeGlobalAliases().
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The specified global has only one non-null value stored into it.
If there are uses of the loaded value that would trap if the loaded value is dynamically null, then we know that they cannot be reachable with a null optimize away the load.
Definition at line 828 of file GlobalOpt.cpp.
References assert(), CleanupConstantGlobalUsers(), CleanupPointerRootUsers(), llvm::dbgs(), DL, llvm::GlobalVariable::eraseFromParent(), isLeakCheckerRoot(), LLVM_DEBUG, llvm::make_early_inc_range(), OptimizeAwayTrappingUsesOfValue(), llvm::Value::use_empty(), and llvm::Value::users().
Referenced by optimizeOnceStoredGlobal().
Definition at line 758 of file GlobalOpt.cpp.
References llvm::CallBase::arg_size(), llvm::CallingConv::C, llvm::ConstantExpr::getAddrSpaceCast(), llvm::CallBase::getArgOperand(), llvm::CallBase::getCalledOperand(), llvm::ConstantExpr::getGetElementPtr(), llvm::Value::getType(), I, llvm::NullPointerIsDefined(), OptimizeAwayTrappingUsesOfValue(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::SmallVectorImpl< T >::reserve(), llvm::CallBase::setArgOperand(), llvm::CallBase::setCalledOperand(), and llvm::SmallVectorBase< Size_T >::size().
Referenced by OptimizeAwayTrappingUsesOfLoads(), and OptimizeAwayTrappingUsesOfValue().
Definition at line 2543 of file GlobalOpt.cpp.
References llvm::Instruction::eraseFromParent(), llvm::CallBase::getArgOperand(), llvm::Constant::getNullValue(), llvm::Value::getType(), IsEmptyAtExitFunction(), llvm::make_early_inc_range(), llvm::Value::replaceAllUsesWith(), llvm::Value::stripPointerCasts(), and llvm::Value::users().
Referenced by optimizeGlobalsInModule().
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Definition at line 1918 of file GlobalOpt.cpp.
References ChangeCalleesToFastCall(), changeCallSitesToColdCC(), llvm::CallingConv::Cold, deleteIfDead(), EnableColdCCStressTest, llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::erase(), F, llvm::CallingConv::Fast, hasChangeableCC(), hasInvokeCallers(), hasMustTailCallers(), hasOnlyColdCalls(), llvm::GlobalValue::InternalLinkage, isValidCandidateForColdCC(), llvm::make_early_inc_range(), processGlobal(), RemoveAttribute(), RemovePreallocated(), llvm::removeUnreachableBlocks(), and llvm::TargetTransformInfo::useColdCCForColdCall().
Referenced by optimizeGlobalsInModule().
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This function takes the specified global variable, and transforms the program as if it always contained the result of the specified malloc.
Because it is always the result of the specified malloc, there is no reason to actually DO the malloc. Instead, turn the malloc into a global, and any loads of GV as uses of the new global.
Definition at line 915 of file GlobalOpt.cpp.
References allUsesOfLoadAndStores(), ConstantPropUsersOf(), llvm::IRBuilderBase::CreateMemSet(), llvm::BinaryOperator::CreateNot(), DL, llvm::GlobalVariable::eraseFromParent(), llvm::Instruction::eraseFromParent(), llvm::errs(), llvm::UndefValue::get(), llvm::GlobalValue::getAddressSpace(), llvm::ConstantInt::getBool(), llvm::Value::getContext(), llvm::ConstantInt::getFalse(), llvm::Type::getInt1Ty(), llvm::Type::getInt8Ty(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::Value::getName(), llvm::ilist_node_with_parent< NodeTy, ParentTy, Options >::getNextNode(), llvm::LoadInst::getOrdering(), llvm::GlobalValue::getParent(), llvm::CmpInst::getPredicate(), llvm::LoadInst::getSyncScopeID(), llvm::GlobalValue::getThreadLocalMode(), llvm::ConstantInt::getTrue(), llvm::Use::getUser(), llvm::GlobalValue::getValueType(), llvm::Module::insertGlobalVariable(), llvm::GlobalValue::InternalLinkage, LLVM_DEBUG, llvm_unreachable, llvm::Value::replaceAllUsesWith(), llvm::Use::set(), llvm::Value::use_begin(), llvm::Value::use_empty(), and llvm::Value::user_back().
Referenced by tryToOptimizeStoreOfAllocationToGlobal().
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Definition at line 2417 of file GlobalOpt.cpp.
References deleteIfDead(), llvm::GlobalValue::getLinkage(), hasUsesToReplace(), llvm::GlobalValue::InternalLinkage, llvm::GlobalValue::isDSOLocal(), llvm::GlobalValue::isImplicitDSOLocal(), llvm::GlobalValue::isInterposableLinkage(), llvm::make_early_inc_range(), mayHaveOtherReferences(), and llvm::Constant::stripPointerCasts().
Referenced by optimizeGlobalsInModule().
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Definition at line 2645 of file GlobalOpt.cpp.
References llvm::CallingConv::C, llvm::SmallPtrSetImplBase::clear(), DeleteDeadIFuncs(), DL, EvaluateStaticConstructor(), F, FindAtExitLibFunc(), llvm::GlobalValue::getComdat(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::GlobalValue::isDiscardableIfUnused(), OptimizeEmptyGlobalAtExitDtors(), OptimizeFunctions(), OptimizeGlobalAliases(), llvm::optimizeGlobalCtorsList(), OptimizeGlobalVars(), OptimizeStaticIFuncs(), and llvm::Value::use_empty().
Referenced by llvm::GlobalOptPass::run().
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Definition at line 2194 of file GlobalOpt.cpp.
References llvm::CallingConv::C, llvm::ConstantFoldConstant(), deleteIfDead(), DL, llvm::GlobalVariable::getInitializer(), llvm::GlobalVariable::hasInitializer(), llvm::GlobalValue::hasLocalLinkage(), llvm::Value::hasName(), llvm::GlobalValue::InternalLinkage, llvm::GlobalValue::isDeclaration(), llvm::make_early_inc_range(), processGlobal(), llvm::GlobalVariable::setInitializer(), llvm::GlobalValue::setLinkage(), and tryWidenGlobalArraysUsedByMemcpy().
Referenced by optimizeGlobalsInModule().
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Definition at line 1118 of file GlobalOpt.cpp.
References DL, llvm::GlobalVariable::getInitializer(), llvm::Type::getPointerAddressSpace(), llvm::Value::getType(), llvm::isAllocationFn(), llvm::Constant::isNullValue(), llvm::Type::isPointerTy(), llvm::NullPointerIsDefined(), OptimizeAwayTrappingUsesOfLoads(), llvm::Value::stripPointerCasts(), and tryToOptimizeStoreOfAllocationToGlobal().
Referenced by processInternalGlobal().
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Definition at line 2618 of file GlobalOpt.cpp.
References hasSideeffectFreeStaticResolution(), and llvm::none_of().
Referenced by optimizeGlobalsInModule().
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Analyze the specified global variable and optimize it if possible.
If we make a change, return true.
Definition at line 1622 of file GlobalOpt.cpp.
References llvm::GlobalStatus::analyzeGlobal(), llvm::Value::getName(), llvm::GlobalValue::getUnnamedAddr(), llvm::GlobalValue::hasGlobalUnnamedAddr(), llvm::GlobalValue::hasLocalLinkage(), processInternalGlobal(), llvm::GlobalValue::setUnnamedAddr(), and llvm::StringRef::starts_with().
Referenced by OptimizeFunctions(), and OptimizeGlobalVars().
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Analyze the specified global variable and optimize it if possible.
If we make a change, return true.
Definition at line 1449 of file GlobalOpt.cpp.
References assert(), CleanupConstantGlobalUsers(), CleanupPointerRootUsers(), llvm::dbgs(), DL, llvm::GlobalVariable::eraseFromParent(), forwardStoredOnceStore(), llvm::PointerType::getAddressSpace(), llvm::GlobalValue::getAddressSpace(), llvm::GlobalValue::getDataLayout(), llvm::GlobalVariable::getInitializer(), llvm::GlobalValue::getLinkage(), llvm::Value::getName(), llvm::GlobalValue::getParent(), llvm::GlobalValue::getThreadLocalMode(), llvm::GlobalValue::getType(), llvm::Value::getType(), llvm::GlobalValue::getValueType(), llvm::GlobalStatus::InitializerStored, llvm::GlobalVariable::isConstant(), llvm::GlobalVariable::isExternallyInitialized(), isLeakCheckerRoot(), isPointerValueDeadOnEntryToFunction(), llvm::Type::isSingleValueType(), LLVM_DEBUG, optimizeOnceStoredGlobal(), llvm::Value::replaceAllUsesWith(), llvm::GlobalVariable::setConstant(), llvm::GlobalVariable::setInitializer(), SRAGlobal(), llvm::GlobalStatus::StoredOnce, TryToShrinkGlobalToBoolean(), and llvm::Value::use_empty().
Referenced by processGlobal().
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Definition at line 1678 of file GlobalOpt.cpp.
References A, F, llvm::CallBase::getAttributes(), llvm::CallBase::setAttributes(), and StripAttr().
Referenced by OptimizeFunctions(), and RemovePreallocated().
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Definition at line 1836 of file GlobalOpt.cpp.
References assert(), llvm::SmallVectorTemplateCommon< T, typename >::begin(), llvm::CallBase::Create(), llvm::IRBuilderBase::CreateAlloca(), llvm::IRBuilderBase::CreateStackRestore(), llvm::IRBuilderBase::CreateStackSave(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::SmallVectorImpl< T >::erase(), llvm::Instruction::eraseFromParent(), F, llvm::CallBase::getArgOperand(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::Instruction::getNextNonDebugInstruction(), llvm::CallBase::getOperandBundlesAsDefs(), llvm::CallBase::isMustTailCall(), RemoveAttribute(), llvm::Value::replaceAllUsesWith(), llvm::IRBuilderBase::SetInsertPoint(), llvm::Value::takeName(), and llvm::Value::users().
Referenced by OptimizeFunctions().
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Definition at line 2267 of file GlobalOpt.cpp.
References llvm::GlobalValue::AppendingLinkage, llvm::array_pod_sort(), llvm::SmallVectorTemplateCommon< T, typename >::begin(), compareNames(), llvm::SmallVectorTemplateCommon< T, typename >::end(), llvm::ConstantArray::get(), llvm::ConstantExpr::getPointerBitCastOrAddrSpaceCast(), llvm::SmallVectorTemplateBase< T, bool >::push_back(), and llvm::SmallVectorBase< Size_T >::size().
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Perform scalar replacement of aggregates on the specified global variable.
This opens the door for other optimizations by exposing the behavior of the program in a more fine-grained way. We have determined that this transformation is safe already. We return the first global variable we insert so that the caller can reprocess it.
Definition at line 520 of file GlobalOpt.cpp.
References _, assert(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::begin(), collectSRATypes(), llvm::commonAlignment(), llvm::GlobalVariable::copyAttributesFrom(), llvm::count_if(), llvm::dbgs(), DL, llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::empty(), llvm::SmallVectorBase< Size_T >::empty(), llvm::GlobalVariable::eraseFromParent(), llvm::GlobalValue::getAddressSpace(), llvm::GlobalObject::getAlign(), llvm::getLoadStorePointerOperand(), llvm::getLoadStoreType(), llvm::Value::getName(), llvm::getOrEnforceKnownAlignment(), llvm::GlobalValue::getParent(), llvm::GlobalValue::getThreadLocalMode(), llvm::GlobalValue::getValueType(), llvm::GlobalValue::hasLocalLinkage(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::insert(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::isSafeToDestroyConstant(), LLVM_DEBUG, llvm::Offset, llvm::SmallVectorImpl< T >::pop_back_val(), Ptr, llvm::SmallVectorTemplateBase< T, bool >::push_back(), llvm::RecursivelyDeleteTriviallyDeadInstructions(), llvm::Constant::removeDeadConstantUsers(), llvm::GlobalObject::setAlignment(), llvm::DenseMapBase< DerivedT, KeyT, ValueT, KeyInfoT, BucketT >::size(), llvm::sort(), and transferSRADebugInfo().
Referenced by processInternalGlobal().
| STATISTIC | ( | NumAliasesRemoved | , |
| "Number of global aliases eliminated" | |||
| ) |
| STATISTIC | ( | NumAliasesResolved | , |
| "Number of global aliases resolved" | |||
| ) |
| STATISTIC | ( | NumAtExitRemoved | , |
| "Number of atexit handlers removed" | |||
| ) |
| STATISTIC | ( | NumColdCC | , |
| "Number of functions marked coldcc" | |||
| ) |
| STATISTIC | ( | NumCtorsEvaluated | , |
| "Number of static ctors evaluated" | |||
| ) |
| STATISTIC | ( | NumCXXDtorsRemoved | , |
| "Number of global C++ destructors removed" | |||
| ) |
| STATISTIC | ( | NumDeleted | , |
| "Number of globals deleted" | |||
| ) |
| STATISTIC | ( | NumFastCallFns | , |
| "Number of functions converted to fastcc" | |||
| ) |
| STATISTIC | ( | NumGlobalArraysPadded | , |
| "Number of global arrays padded to alignment boundary" | |||
| ) |
| STATISTIC | ( | NumGlobUses | , |
| "Number of global uses devirtualized" | |||
| ) |
| STATISTIC | ( | NumIFuncsDeleted | , |
| "Number of IFuncs removed" | |||
| ) |
| STATISTIC | ( | NumIFuncsResolved | , |
| "Number of statically resolved IFuncs" | |||
| ) |
| STATISTIC | ( | NumInternalFunc | , |
| "Number of internal functions" | |||
| ) |
| STATISTIC | ( | NumLocalized | , |
| "Number of globals localized" | |||
| ) |
| STATISTIC | ( | NumMarked | , |
| "Number of globals marked constant" | |||
| ) |
| STATISTIC | ( | NumNestRemoved | , |
| "Number of nest attributes removed" | |||
| ) |
| STATISTIC | ( | NumShrunkToBool | , |
| "Number of global vars shrunk to booleans" | |||
| ) |
| STATISTIC | ( | NumSRA | , |
| "Number of aggregate globals broken into scalars" | |||
| ) |
| STATISTIC | ( | NumSubstitute | , |
| "Number of globals with initializers stored into them" | |||
| ) |
| STATISTIC | ( | NumUnnamed | , |
| "Number of globals marked unnamed_addr" | |||
| ) |
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Definition at line 1670 of file GlobalOpt.cpp.
References A, and llvm::CallingConv::C.
Referenced by RemoveAttribute().
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Copy over the debug info for a variable to its SRA replacements.
Definition at line 440 of file GlobalOpt.cpp.
References llvm::GlobalVariable::addDebugInfo(), llvm::DIExpression::createFragmentExpression(), llvm::DIExpression::extractIfOffset(), llvm::MDNode::getContext(), llvm::GlobalVariable::getDebugInfo(), llvm::DIType::getSizeInBits(), and llvm::DIVariable::getType().
Referenced by SRAGlobal().
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If we have a global that is only initialized with a fixed size allocation try to transform the program to use global memory instead of heap allocated memory.
This eliminates dynamic allocation, avoids an indirection accessing the data, and exposes the resultant global to further GlobalOpt.
Definition at line 1071 of file GlobalOpt.cpp.
References allUsesOfLoadedValueWillTrapIfNull(), DL, llvm::Function::getContext(), llvm::Instruction::getFunction(), llvm::getInitialValueOfAllocation(), llvm::Type::getInt8Ty(), llvm::getObjectSize(), llvm::isRemovableAlloc(), OptimizeGlobalAddressOfAllocation(), and valueIsOnlyUsedLocallyOrStoredToOneGlobal().
Referenced by optimizeOnceStoredGlobal().
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At this point, we have learned that the only two values ever stored into GV are its initializer and OtherVal.
See if we can shrink the global into a boolean and select between the two values whenever it is used. This exposes the values to other scalar optimizations.
Definition at line 1154 of file GlobalOpt.cpp.
References llvm::GlobalVariable::addDebugInfo(), assert(), llvm::GlobalVariable::copyAttributesFrom(), llvm::SelectInst::Create(), llvm::dbgs(), DL, llvm::GlobalVariable::eraseFromParent(), llvm::Instruction::eraseFromParent(), llvm::PointerType::getAddressSpace(), llvm::Value::getContext(), llvm::GlobalValue::getDataLayout(), llvm::GlobalVariable::getDebugInfo(), llvm::Instruction::getDebugLoc(), llvm::ConstantInt::getFalse(), llvm::GlobalVariable::getInitializer(), llvm::Type::getInt1Ty(), llvm::ilist_node_impl< OptionsT >::getIterator(), llvm::getLoadStoreType(), llvm::Value::getName(), llvm::User::getOperand(), llvm::LoadInst::getOrdering(), llvm::GlobalValue::getParent(), llvm::LoadInst::getSyncScopeID(), llvm::GlobalValue::getThreadLocalMode(), llvm::GlobalValue::getType(), llvm::Value::getType(), llvm::GlobalValue::getValueType(), llvm::Module::insertGlobalVariable(), llvm::GlobalValue::InternalLinkage, llvm::Type::isFloatingPointTy(), llvm::Constant::isNullValue(), llvm::Type::isPointerTy(), llvm::Type::isVectorTy(), LLVM_DEBUG, llvm::DIExpression::prependOpcodes(), llvm::Value::replaceAllUsesWith(), llvm::Instruction::setDebugLoc(), llvm::Value::takeName(), llvm::Value::use_empty(), llvm::Value::user_back(), and llvm::Value::users().
Referenced by processInternalGlobal().
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Definition at line 2111 of file GlobalOpt.cpp.
References callInstIsMemcpy(), destArrayCanBeWidened(), F, llvm::Value::getType(), llvm::Value::replaceAllUsesWith(), llvm::Value::users(), widenDestArray(), and widenGlobalVariable().
Referenced by tryWidenGlobalArraysUsedByMemcpy().
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Definition at line 2142 of file GlobalOpt.cpp.
References callInstIsMemcpy(), destArrayCanBeWidened(), llvm::divideCeil(), F, llvm::CallBase::getArgOperand(), llvm::CallBase::getCalledFunction(), llvm::ConstantDataSequential::getElementByteSize(), llvm::GlobalVariable::getInitializer(), llvm::ArrayType::getNumElements(), llvm::ConstantDataArray::getType(), llvm::GlobalValue::hasGlobalUnnamedAddr(), llvm::GlobalVariable::hasInitializer(), llvm::GlobalValue::hasLocalLinkage(), llvm::GlobalVariable::isConstant(), tryWidenGlobalArrayAndDests(), and llvm::Value::users().
Referenced by OptimizeGlobalVars().
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Scan the use-list of GV checking to make sure that there are no complex uses of GV.
We permit simple things like dereferencing the pointer, but not storing through the address, unless it is to the specified global.
Definition at line 1032 of file GlobalOpt.cpp.
References llvm::SmallVectorBase< Size_T >::empty(), llvm::SmallPtrSetImpl< PtrType >::insert(), llvm::SmallVectorImpl< T >::pop_back_val(), and llvm::SmallVectorTemplateBase< T, bool >::push_back().
Referenced by tryToOptimizeStoreOfAllocationToGlobal().
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Definition at line 2091 of file GlobalOpt.cpp.
References llvm::IRBuilderBase::CreateAlloca(), llvm::divideCeil(), llvm::CallBase::getArgOperand(), llvm::ConstantDataSequential::getElementByteSize(), llvm::AllocaInst::setAlignment(), and llvm::Value::takeName().
Referenced by tryWidenGlobalArrayAndDests().
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Definition at line 2061 of file GlobalOpt.cpp.
References llvm::GlobalVariable::copyAttributesFrom(), F, llvm::ConstantDataArray::get(), llvm::GlobalVariable::getInitializer(), llvm::GlobalValue::getLinkage(), llvm::Value::getName(), llvm::ConstantDataSequential::getRawDataValues(), llvm::Value::getType(), llvm::GlobalVariable::hasInitializer(), and llvm::Value::takeName().
Referenced by tryWidenGlobalArrayAndDests().
| Find IFuncs that have resolvers that always point at the same statically known callee |
Definition at line 2617 of file GlobalOpt.cpp.
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Referenced by isColdCallSite().
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Referenced by OptimizeFunctions().
1.9.6