//
//===----------------------------------------------------------------------===//
-#include "llvm/Analysis/Passes.h"
-#include "llvm/Analysis/AliasAnalysis.h"
-#include "llvm/Analysis/ScalarEvolutionExpressions.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Pass.h"
+#include "llvm/Analysis/ScalarEvolutionAliasAnalysis.h"
using namespace llvm;
-namespace {
- /// ScalarEvolutionAliasAnalysis - This is a simple alias analysis
- /// implementation that uses ScalarEvolution to answer queries.
- class ScalarEvolutionAliasAnalysis : public FunctionPass,
- public AliasAnalysis {
- ScalarEvolution *SE;
-
- public:
- static char ID; // Class identification, replacement for typeinfo
- ScalarEvolutionAliasAnalysis() : FunctionPass(ID), SE(nullptr) {
- initializeScalarEvolutionAliasAnalysisPass(
- *PassRegistry::getPassRegistry());
- }
-
- /// getAdjustedAnalysisPointer - This method is used when a pass implements
- /// an analysis interface through multiple inheritance. If needed, it
- /// should override this to adjust the this pointer as needed for the
- /// specified pass info.
- void *getAdjustedAnalysisPointer(AnalysisID PI) override {
- if (PI == &AliasAnalysis::ID)
- return (AliasAnalysis*)this;
- return this;
- }
-
- private:
- void getAnalysisUsage(AnalysisUsage &AU) const override;
- bool runOnFunction(Function &F) override;
- AliasResult alias(const MemoryLocation &LocA,
- const MemoryLocation &LocB) override;
-
- Value *GetBaseValue(const SCEV *S);
- };
-} // End of anonymous namespace
-
// Register this pass...
char ScalarEvolutionAliasAnalysis::ID = 0;
INITIALIZE_AG_PASS_BEGIN(ScalarEvolutionAliasAnalysis, AliasAnalysis, "scev-aa",
- "ScalarEvolution-based Alias Analysis", false, true, false)
+ "ScalarEvolution-based Alias Analysis", false, true,
+ false)
INITIALIZE_PASS_DEPENDENCY(ScalarEvolution)
INITIALIZE_AG_PASS_END(ScalarEvolutionAliasAnalysis, AliasAnalysis, "scev-aa",
- "ScalarEvolution-based Alias Analysis", false, true, false)
+ "ScalarEvolution-based Alias Analysis", false, true,
+ false)
FunctionPass *llvm::createScalarEvolutionAliasAnalysisPass() {
return new ScalarEvolutionAliasAnalysis();
}
-void
-ScalarEvolutionAliasAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
+void ScalarEvolutionAliasAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequiredTransitive<ScalarEvolution>();
AU.setPreservesAll();
AliasAnalysis::getAnalysisUsage(AU);
}
-bool
-ScalarEvolutionAliasAnalysis::runOnFunction(Function &F) {
+bool ScalarEvolutionAliasAnalysis::runOnFunction(Function &F) {
InitializeAliasAnalysis(this, &F.getParent()->getDataLayout());
SE = &getAnalysis<ScalarEvolution>();
return false;
/// GetBaseValue - Given an expression, try to find a
/// base value. Return null is none was found.
-Value *
-ScalarEvolutionAliasAnalysis::GetBaseValue(const SCEV *S) {
+Value *ScalarEvolutionAliasAnalysis::GetBaseValue(const SCEV *S) {
if (const SCEVAddRecExpr *AR = dyn_cast<SCEVAddRecExpr>(S)) {
// In an addrec, assume that the base will be in the start, rather
// than the step.
return GetBaseValue(AR->getStart());
} else if (const SCEVAddExpr *A = dyn_cast<SCEVAddExpr>(S)) {
// If there's a pointer operand, it'll be sorted at the end of the list.
- const SCEV *Last = A->getOperand(A->getNumOperands()-1);
+ const SCEV *Last = A->getOperand(A->getNumOperands() - 1);
if (Last->getType()->isPointerTy())
return GetBaseValue(Last);
} else if (const SCEVUnknown *U = dyn_cast<SCEVUnknown>(S)) {
return nullptr;
}
-AliasAnalysis::AliasResult
-ScalarEvolutionAliasAnalysis::alias(const MemoryLocation &LocA,
- const MemoryLocation &LocB) {
+AliasResult ScalarEvolutionAliasAnalysis::alias(const MemoryLocation &LocA,
+ const MemoryLocation &LocB) {
// If either of the memory references is empty, it doesn't matter what the
// pointer values are. This allows the code below to ignore this special
// case.
const SCEV *BS = SE->getSCEV(const_cast<Value *>(LocB.Ptr));
// If they evaluate to the same expression, it's a MustAlias.
- if (AS == BS) return MustAlias;
+ if (AS == BS)
+ return MustAlias;
// If something is known about the difference between the two addresses,
// see if it's enough to prove a NoAlias.
Value *AO = GetBaseValue(AS);
Value *BO = GetBaseValue(BS);
if ((AO && AO != LocA.Ptr) || (BO && BO != LocB.Ptr))
- if (alias(MemoryLocation(AO ? AO : LocA.Ptr, AO ? +UnknownSize : LocA.Size,
+ if (alias(MemoryLocation(AO ? AO : LocA.Ptr,
+ AO ? +MemoryLocation::UnknownSize : LocA.Size,
AO ? AAMDNodes() : LocA.AATags),
- MemoryLocation(BO ? BO : LocB.Ptr, BO ? +UnknownSize : LocB.Size,
+ MemoryLocation(BO ? BO : LocB.Ptr,
+ BO ? +MemoryLocation::UnknownSize : LocB.Size,
BO ? AAMDNodes() : LocB.AATags)) == NoAlias)
return NoAlias;