LLVM 20.0.0git
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#include "llvm/Analysis/BasicAliasAnalysis.h"
#include "llvm/ADT/APInt.h"
#include "llvm/ADT/ScopeExit.h"
#include "llvm/ADT/SmallPtrSet.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Analysis/AliasAnalysis.h"
#include "llvm/Analysis/AssumptionCache.h"
#include "llvm/Analysis/CFG.h"
#include "llvm/Analysis/CaptureTracking.h"
#include "llvm/Analysis/MemoryBuiltins.h"
#include "llvm/Analysis/MemoryLocation.h"
#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/IR/Argument.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Constant.h"
#include "llvm/IR/ConstantRange.h"
#include "llvm/IR/Constants.h"
#include "llvm/IR/DataLayout.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Dominators.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GetElementPtrTypeIterator.h"
#include "llvm/IR/GlobalAlias.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/InstrTypes.h"
#include "llvm/IR/Instruction.h"
#include "llvm/IR/Instructions.h"
#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/Intrinsics.h"
#include "llvm/IR/Operator.h"
#include "llvm/IR/PatternMatch.h"
#include "llvm/IR/Type.h"
#include "llvm/IR/User.h"
#include "llvm/IR/Value.h"
#include "llvm/InitializePasses.h"
#include "llvm/Pass.h"
#include "llvm/Support/Casting.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Compiler.h"
#include "llvm/Support/KnownBits.h"
#include "llvm/Support/SaveAndRestore.h"
#include <cassert>
#include <cstdint>
#include <cstdlib>
#include <optional>
#include <utility>
Go to the source code of this file.
Classes | |
struct | llvm::BasicAAResult::DecomposedGEP |
Macros | |
#define | DEBUG_TYPE "basicaa" |
Functions | |
STATISTIC (SearchLimitReached, "Number of times the limit to " "decompose GEPs is reached") | |
SearchLimitReached / SearchTimes shows how often the limit of to decompose GEPs is reached. | |
STATISTIC (SearchTimes, "Number of times a GEP is decomposed") | |
static std::optional< TypeSize > | getObjectSize (const Value *V, const DataLayout &DL, const TargetLibraryInfo &TLI, bool NullIsValidLoc, bool RoundToAlign=false) |
Returns the size of the object specified by V or UnknownSize if unknown. | |
static bool | isObjectSmallerThan (const Value *V, TypeSize Size, const DataLayout &DL, const TargetLibraryInfo &TLI, bool NullIsValidLoc) |
Returns true if we can prove that the object specified by V is smaller than Size. | |
static TypeSize | getMinimalExtentFrom (const Value &V, const LocationSize &LocSize, const DataLayout &DL, bool NullIsValidLoc) |
Return the minimal extent from V to the end of the underlying object, assuming the result is used in an aliasing query. | |
static bool | isObjectSize (const Value *V, TypeSize Size, const DataLayout &DL, const TargetLibraryInfo &TLI, bool NullIsValidLoc) |
Returns true if we can prove that the object specified by V has size Size. | |
static bool | areBothVScale (const Value *V1, const Value *V2) |
Return true if both V1 and V2 are VScale. | |
static bool | isNotInCycle (const Instruction *I, const DominatorTree *DT, const LoopInfo *LI) |
static LinearExpression | GetLinearExpression (const CastedValue &Val, const DataLayout &DL, unsigned Depth, AssumptionCache *AC, DominatorTree *DT) |
Analyzes the specified value as a linear expression: "A*V + B", where A and B are constant integers. | |
static void | adjustToIndexSize (APInt &Offset, unsigned IndexSize) |
To ensure a pointer offset fits in an integer of size IndexSize (in bits) when that size is smaller than the maximum index size. | |
static bool | isIntrinsicCall (const CallBase *Call, Intrinsic::ID IID) |
static const Function * | getParent (const Value *V) |
static bool | notDifferentParent (const Value *O1, const Value *O2) |
static bool | isBaseOfObject (const Value *V) |
Return true if we know V to the base address of the corresponding memory object. | |
static AliasResult | MergeAliasResults (AliasResult A, AliasResult B) |
INITIALIZE_PASS_BEGIN (BasicAAWrapperPass, "basic-aa", "Basic Alias Analysis (stateless AA impl)", true, true) INITIALIZE_PASS_END(BasicAAWrapperPass | |
basic Basic Alias | Analysis (stateless AA impl)" |
Variables | |
static cl::opt< bool > | EnableRecPhiAnalysis ("basic-aa-recphi", cl::Hidden, cl::init(true)) |
Enable analysis of recursive PHI nodes. | |
static cl::opt< bool > | EnableSeparateStorageAnalysis ("basic-aa-separate-storage", cl::Hidden, cl::init(true)) |
static const unsigned | MaxLookupSearchDepth = 6 |
basic | aa |
basic Basic Alias | true |
#define DEBUG_TYPE "basicaa" |
Definition at line 64 of file BasicAliasAnalysis.cpp.
To ensure a pointer offset fits in an integer of size IndexSize (in bits) when that size is smaller than the maximum index size.
This is an issue, for example, in particular for 32b pointers with negative indices that rely on two's complement wrap-arounds for precise alias information where the maximum index size is 64b.
Definition at line 500 of file BasicAliasAnalysis.cpp.
References assert(), and llvm::Offset.
basic Basic Alias Analysis | ( | stateless AA | impl | ) |
Return true if both V1 and V2 are VScale.
Definition at line 193 of file BasicAliasAnalysis.cpp.
References llvm::PatternMatch::m_VScale(), and llvm::PatternMatch::match().
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Analyzes the specified value as a linear expression: "A*V + B", where A and B are constant integers.
Definition at line 402 of file BasicAliasAnalysis.cpp.
References llvm::Depth, DL, GetLinearExpression(), and RHS.
Referenced by GetLinearExpression().
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Return the minimal extent from V
to the end of the underlying object, assuming the result is used in an aliasing query.
E.g., we do use the query location size and the fact that null pointers cannot alias here.
Definition at line 165 of file BasicAliasAnalysis.cpp.
References DL, llvm::TypeSize::getFixed(), llvm::details::FixedOrScalableQuantity< LeafTy, ValueTy >::getKnownMinValue(), llvm::LocationSize::getValue(), and llvm::LocationSize::isPrecise().
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Returns the size of the object specified by V or UnknownSize if unknown.
Definition at line 105 of file BasicAliasAnalysis.cpp.
References DL, llvm::TypeSize::getFixed(), llvm::getObjectSize(), llvm::ObjectSizeOpts::NullIsUnknownSize, llvm::ObjectSizeOpts::RoundToAlign, and Size.
Definition at line 882 of file BasicAliasAnalysis.cpp.
References llvm::GlobalValue::getParent().
Referenced by llvm::CanonicalLoopInfo::assertOK(), llvm::slpvectorizer::BoUpSLP::canVectorizeLoads(), llvm::CloneAndPruneIntoFromInst(), llvm::JumpThreadingPass::computeValueKnownInPredecessorsImpl(), detectPopcountIdiom(), ensureValueAvailableInSuccessor(), llvm::CodeExtractor::findAllocas(), llvm::InstCombinerImpl::foldOpIntoPhi(), llvm::RegionBase< Tr >::getDepth(), llvm::VPBasicBlock::getEnclosingLoopRegion(), llvm::getLiveRegMap(), getLocalFunctionMetadata(), llvm::CoroIdAsyncInst::getStorage(), isBlockValidForExtraction(), llvm::PHINode::isComplete(), llvm::VPBasicBlock::isExiting(), llvm::CodeExtractor::isLegalToShrinkwrapLifetimeMarkers(), isOnlyUsedInEntryBlock(), isUsedOutsideOfDefiningBlock(), LLVMGetBasicBlockParent(), LLVMGetGlobalParent(), LLVMGetInstructionParent(), LLVMGetParamParent(), notDifferentParent(), llvm::MachineFunction::print(), llvm::LoopVectorizePass::processLoop(), redirectValuesFromPredecessorsToPhi(), llvm::AssumptionCache::registerAssumption(), llvm::ScheduleDAGMI::schedule(), llvm::ScheduleDAGMILive::schedule(), llvm::VLIWMachineScheduler::schedule(), llvm::SIScheduleDAGMI::schedule(), and splitCallSite().
INITIALIZE_PASS_BEGIN | ( | BasicAAWrapperPass | , |
"basic-aa" | , | ||
"Basic Alias Analysis (stateless AA impl)" | , | ||
true | , | ||
true | |||
) |
Return true if we know V to the base address of the corresponding memory object.
This implies that any address less than V must be out of bounds for the underlying object. Note that just being isIdentifiedObject() is not enough - For example, a negative offset from a noalias argument or call can be inbounds w.r.t the actual underlying object.
Definition at line 1074 of file BasicAliasAnalysis.cpp.
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Definition at line 828 of file BasicAliasAnalysis.cpp.
References II.
Referenced by llvm::BasicAAResult::getModRefInfo(), isPreserveArrayIndex(), isPreserveStructIndex(), and isPreserveUnionIndex().
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Definition at line 209 of file BasicAliasAnalysis.cpp.
References llvm::SmallVectorBase< Size_T >::empty(), I, llvm::isPotentiallyReachableFromMany(), and llvm::successors().
Referenced by llvm::EarliestEscapeInfo::isNotCapturedBefore().
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Returns true if we can prove that the object specified by V has size Size.
Definition at line 185 of file BasicAliasAnalysis.cpp.
References DL, llvm::getObjectSize(), and Size.
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Returns true if we can prove that the object specified by V is smaller than Size.
Definition at line 121 of file BasicAliasAnalysis.cpp.
References DL, llvm::getObjectSize(), llvm::isIdentifiedObject(), llvm::details::FixedOrScalableQuantity< TypeSize, uint64_t >::isKnownLT(), and Size.
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Definition at line 1374 of file BasicAliasAnalysis.cpp.
References A, B, llvm::AliasResult::MayAlias, llvm::AliasResult::MustAlias, and llvm::AliasResult::PartialAlias.
Definition at line 895 of file BasicAliasAnalysis.cpp.
References getParent().
Referenced by llvm::BasicAAResult::alias(), and llvm::BasicAAResult::getModRefInfo().
STATISTIC | ( | SearchLimitReached | , |
"Number of times the limit to " "decompose GEPs is reached" | |||
) |
SearchLimitReached / SearchTimes shows how often the limit of to decompose GEPs is reached.
It will affect the precision of basic alias analysis.
STATISTIC | ( | SearchTimes | , |
"Number of times a GEP is decomposed" | |||
) |
basic aa |
Definition at line 1964 of file BasicAliasAnalysis.cpp.
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Enable analysis of recursive PHI nodes.
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Definition at line 84 of file BasicAliasAnalysis.cpp.
Definition at line 1965 of file BasicAliasAnalysis.cpp.
Referenced by llvm::PotentialValuesState< MemberTy >::contains(), llvm::PPCInstrInfo::getFMAPatterns(), getIsFloat(), llvm::X86CallLowering::lowerCall(), llvm::MIPatternMatch::GCstAndRegMatch::match(), llvm::MIPatternMatch::GFCstAndRegMatch::match(), matchIntrinsicType(), llvm::ScopedHandle< HandleTraits >::operator bool(), llvm::orc::BlockFreqQuery::operator()(), and llvm::TargetLowering::SimplifyDemandedVectorElts().