SCEVCouldNotCompute::SCEVCouldNotCompute() :
SCEV(scCouldNotCompute) {}
+void SCEVCouldNotCompute::Profile(FoldingSetNodeID &ID) const {
+ assert(0 && "Attempt to use a SCEVCouldNotCompute object!");
+}
+
bool SCEVCouldNotCompute::isLoopInvariant(const Loop *L) const {
assert(0 && "Attempt to use a SCEVCouldNotCompute object!");
return false;
}
const SCEV* ScalarEvolution::getConstant(ConstantInt *V) {
- SCEVConstant *&R = SCEVConstants[V];
- if (R == 0) R = new SCEVConstant(V);
- return R;
+ FoldingSetNodeID ID;
+ ID.AddInteger(scConstant);
+ ID.AddPointer(V);
+ void *IP = 0;
+ if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
+ SCEV *S = SCEVAllocator.Allocate<SCEVConstant>();
+ new (S) SCEVConstant(V);
+ UniqueSCEVs.InsertNode(S, IP);
+ return S;
}
const SCEV* ScalarEvolution::getConstant(const APInt& Val) {
return getConstant(ConstantInt::get(cast<IntegerType>(Ty), V, isSigned));
}
+void SCEVConstant::Profile(FoldingSetNodeID &ID) const {
+ ID.AddInteger(scConstant);
+ ID.AddPointer(V);
+}
+
const Type *SCEVConstant::getType() const { return V->getType(); }
void SCEVConstant::print(raw_ostream &OS) const {
const SCEV* op, const Type *ty)
: SCEV(SCEVTy), Op(op), Ty(ty) {}
+void SCEVCastExpr::Profile(FoldingSetNodeID &ID) const {
+ ID.AddInteger(getSCEVType());
+ ID.AddPointer(Op);
+ ID.AddPointer(Ty);
+}
+
bool SCEVCastExpr::dominates(BasicBlock *BB, DominatorTree *DT) const {
return Op->dominates(BB, DT);
}
return this;
}
+void SCEVNAryExpr::Profile(FoldingSetNodeID &ID) const {
+ ID.AddInteger(getSCEVType());
+ ID.AddInteger(Operands.size());
+ for (unsigned i = 0, e = Operands.size(); i != e; ++i)
+ ID.AddPointer(Operands[i]);
+}
+
bool SCEVNAryExpr::dominates(BasicBlock *BB, DominatorTree *DT) const {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i) {
if (!getOperand(i)->dominates(BB, DT))
return true;
}
+void SCEVUDivExpr::Profile(FoldingSetNodeID &ID) const {
+ ID.AddInteger(scUDivExpr);
+ ID.AddPointer(LHS);
+ ID.AddPointer(RHS);
+}
+
bool SCEVUDivExpr::dominates(BasicBlock *BB, DominatorTree *DT) const {
return LHS->dominates(BB, DT) && RHS->dominates(BB, DT);
}
return RHS->getType();
}
+void SCEVAddRecExpr::Profile(FoldingSetNodeID &ID) const {
+ ID.AddInteger(scAddRecExpr);
+ ID.AddInteger(Operands.size());
+ for (unsigned i = 0, e = Operands.size(); i != e; ++i)
+ ID.AddPointer(Operands[i]);
+ ID.AddPointer(L);
+}
+
const SCEV *
SCEVAddRecExpr::replaceSymbolicValuesWithConcrete(const SCEV *Sym,
const SCEV *Conc,
OS << "}<" << L->getHeader()->getName() + ">";
}
+void SCEVUnknown::Profile(FoldingSetNodeID &ID) const {
+ ID.AddInteger(scUnknown);
+ ID.AddPointer(V);
+}
+
bool SCEVUnknown::isLoopInvariant(const Loop *L) const {
// All non-instruction values are loop invariant. All instructions are loop
// invariant if they are not contained in the specified loop.
return getAddRecExpr(Operands, AddRec->getLoop());
}
- SCEVTruncateExpr *&Result = SCEVTruncates[std::make_pair(Op, Ty)];
- if (Result == 0) Result = new SCEVTruncateExpr(Op, Ty);
- return Result;
+ FoldingSetNodeID ID;
+ ID.AddInteger(scTruncate);
+ ID.AddPointer(Op);
+ ID.AddPointer(Ty);
+ void *IP = 0;
+ if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
+ SCEV *S = SCEVAllocator.Allocate<SCEVTruncateExpr>();
+ new (S) SCEVTruncateExpr(Op, Ty);
+ UniqueSCEVs.InsertNode(S, IP);
+ return S;
}
const SCEV* ScalarEvolution::getZeroExtendExpr(const SCEV* Op,
}
}
- SCEVZeroExtendExpr *&Result = SCEVZeroExtends[std::make_pair(Op, Ty)];
- if (Result == 0) Result = new SCEVZeroExtendExpr(Op, Ty);
- return Result;
+ FoldingSetNodeID ID;
+ ID.AddInteger(scZeroExtend);
+ ID.AddPointer(Op);
+ ID.AddPointer(Ty);
+ void *IP = 0;
+ if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
+ SCEV *S = SCEVAllocator.Allocate<SCEVZeroExtendExpr>();
+ new (S) SCEVZeroExtendExpr(Op, Ty);
+ UniqueSCEVs.InsertNode(S, IP);
+ return S;
}
const SCEV* ScalarEvolution::getSignExtendExpr(const SCEV* Op,
}
}
- SCEVSignExtendExpr *&Result = SCEVSignExtends[std::make_pair(Op, Ty)];
- if (Result == 0) Result = new SCEVSignExtendExpr(Op, Ty);
- return Result;
+ FoldingSetNodeID ID;
+ ID.AddInteger(scSignExtend);
+ ID.AddPointer(Op);
+ ID.AddPointer(Ty);
+ void *IP = 0;
+ if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
+ SCEV *S = SCEVAllocator.Allocate<SCEVSignExtendExpr>();
+ new (S) SCEVSignExtendExpr(Op, Ty);
+ UniqueSCEVs.InsertNode(S, IP);
+ return S;
}
/// getAnyExtendExpr - Return a SCEV for the given operand extended with
// Okay, it looks like we really DO need an add expr. Check to see if we
// already have one, otherwise create a new one.
- std::vector<const SCEV*> SCEVOps(Ops.begin(), Ops.end());
- SCEVCommutativeExpr *&Result = SCEVCommExprs[std::make_pair(scAddExpr,
- SCEVOps)];
- if (Result == 0) Result = new SCEVAddExpr(Ops);
- return Result;
+ FoldingSetNodeID ID;
+ ID.AddInteger(scAddExpr);
+ ID.AddInteger(Ops.size());
+ for (unsigned i = 0, e = Ops.size(); i != e; ++i)
+ ID.AddPointer(Ops[i]);
+ void *IP = 0;
+ if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
+ SCEV *S = SCEVAllocator.Allocate<SCEVAddExpr>();
+ new (S) SCEVAddExpr(Ops);
+ UniqueSCEVs.InsertNode(S, IP);
+ return S;
}
// Okay, it looks like we really DO need an mul expr. Check to see if we
// already have one, otherwise create a new one.
- std::vector<const SCEV*> SCEVOps(Ops.begin(), Ops.end());
- SCEVCommutativeExpr *&Result = SCEVCommExprs[std::make_pair(scMulExpr,
- SCEVOps)];
- if (Result == 0)
- Result = new SCEVMulExpr(Ops);
- return Result;
+ FoldingSetNodeID ID;
+ ID.AddInteger(scMulExpr);
+ ID.AddInteger(Ops.size());
+ for (unsigned i = 0, e = Ops.size(); i != e; ++i)
+ ID.AddPointer(Ops[i]);
+ void *IP = 0;
+ if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
+ SCEV *S = SCEVAllocator.Allocate<SCEVMulExpr>();
+ new (S) SCEVMulExpr(Ops);
+ UniqueSCEVs.InsertNode(S, IP);
+ return S;
}
/// getUDivExpr - Get a canonical multiply expression, or something simpler if
}
}
- SCEVUDivExpr *&Result = SCEVUDivs[std::make_pair(LHS, RHS)];
- if (Result == 0) Result = new SCEVUDivExpr(LHS, RHS);
- return Result;
+ FoldingSetNodeID ID;
+ ID.AddInteger(scUDivExpr);
+ ID.AddPointer(LHS);
+ ID.AddPointer(RHS);
+ void *IP = 0;
+ if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
+ SCEV *S = SCEVAllocator.Allocate<SCEVUDivExpr>();
+ new (S) SCEVUDivExpr(LHS, RHS);
+ UniqueSCEVs.InsertNode(S, IP);
+ return S;
}
}
}
- std::vector<const SCEV*> SCEVOps(Operands.begin(), Operands.end());
- SCEVAddRecExpr *&Result = SCEVAddRecExprs[std::make_pair(L, SCEVOps)];
- if (Result == 0) Result = new SCEVAddRecExpr(Operands, L);
- return Result;
+ FoldingSetNodeID ID;
+ ID.AddInteger(scAddRecExpr);
+ ID.AddInteger(Operands.size());
+ for (unsigned i = 0, e = Operands.size(); i != e; ++i)
+ ID.AddPointer(Operands[i]);
+ ID.AddPointer(L);
+ void *IP = 0;
+ if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
+ SCEV *S = SCEVAllocator.Allocate<SCEVAddRecExpr>();
+ new (S) SCEVAddRecExpr(Operands, L);
+ UniqueSCEVs.InsertNode(S, IP);
+ return S;
}
const SCEV *ScalarEvolution::getSMaxExpr(const SCEV *LHS,
// Okay, it looks like we really DO need an smax expr. Check to see if we
// already have one, otherwise create a new one.
- std::vector<const SCEV*> SCEVOps(Ops.begin(), Ops.end());
- SCEVCommutativeExpr *&Result = SCEVCommExprs[std::make_pair(scSMaxExpr,
- SCEVOps)];
- if (Result == 0) Result = new SCEVSMaxExpr(Ops);
- return Result;
+ FoldingSetNodeID ID;
+ ID.AddInteger(scSMaxExpr);
+ ID.AddInteger(Ops.size());
+ for (unsigned i = 0, e = Ops.size(); i != e; ++i)
+ ID.AddPointer(Ops[i]);
+ void *IP = 0;
+ if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
+ SCEV *S = SCEVAllocator.Allocate<SCEVSMaxExpr>();
+ new (S) SCEVSMaxExpr(Ops);
+ UniqueSCEVs.InsertNode(S, IP);
+ return S;
}
const SCEV *ScalarEvolution::getUMaxExpr(const SCEV *LHS,
// Okay, it looks like we really DO need a umax expr. Check to see if we
// already have one, otherwise create a new one.
- std::vector<const SCEV*> SCEVOps(Ops.begin(), Ops.end());
- SCEVCommutativeExpr *&Result = SCEVCommExprs[std::make_pair(scUMaxExpr,
- SCEVOps)];
- if (Result == 0) Result = new SCEVUMaxExpr(Ops);
- return Result;
+ FoldingSetNodeID ID;
+ ID.AddInteger(scUMaxExpr);
+ ID.AddInteger(Ops.size());
+ for (unsigned i = 0, e = Ops.size(); i != e; ++i)
+ ID.AddPointer(Ops[i]);
+ void *IP = 0;
+ if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
+ SCEV *S = SCEVAllocator.Allocate<SCEVUMaxExpr>();
+ new (S) SCEVUMaxExpr(Ops);
+ UniqueSCEVs.InsertNode(S, IP);
+ return S;
}
const SCEV *ScalarEvolution::getSMinExpr(const SCEV *LHS,
// interesting possibilities, and any other code that calls getUnknown
// is doing so in order to hide a value from SCEV canonicalization.
- SCEVUnknown *&Result = SCEVUnknowns[V];
- if (Result == 0) Result = new SCEVUnknown(V);
- return Result;
+ FoldingSetNodeID ID;
+ ID.AddInteger(scUnknown);
+ ID.AddPointer(V);
+ void *IP = 0;
+ if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
+ SCEV *S = SCEVAllocator.Allocate<SCEVUnknown>();
+ new (S) SCEVUnknown(V);
+ UniqueSCEVs.InsertNode(S, IP);
+ return S;
}
//===----------------------------------------------------------------------===//
}
const SCEV* ScalarEvolution::getCouldNotCompute() {
- return CouldNotCompute;
+ return &CouldNotCompute;
}
/// hasSCEV - Return true if the SCEV for this value has already been
BackedgeTakenCounts.insert(std::make_pair(L, getCouldNotCompute()));
if (Pair.second) {
BackedgeTakenInfo ItCount = ComputeBackedgeTakenCount(L);
- if (ItCount.Exact != CouldNotCompute) {
+ if (ItCount.Exact != getCouldNotCompute()) {
assert(ItCount.Exact->isLoopInvariant(L) &&
ItCount.Max->isLoopInvariant(L) &&
"Computed trip count isn't loop invariant for loop!");
// Update the value in the map.
Pair.first->second = ItCount;
} else {
- if (ItCount.Max != CouldNotCompute)
+ if (ItCount.Max != getCouldNotCompute())
// Update the value in the map.
Pair.first->second = ItCount;
if (isa<PHINode>(L->getHeader()->begin()))
L->getExitingBlocks(ExitingBlocks);
// Examine all exits and pick the most conservative values.
- const SCEV* BECount = CouldNotCompute;
- const SCEV* MaxBECount = CouldNotCompute;
+ const SCEV* BECount = getCouldNotCompute();
+ const SCEV* MaxBECount = getCouldNotCompute();
bool CouldNotComputeBECount = false;
for (unsigned i = 0, e = ExitingBlocks.size(); i != e; ++i) {
BackedgeTakenInfo NewBTI =
ComputeBackedgeTakenCountFromExit(L, ExitingBlocks[i]);
- if (NewBTI.Exact == CouldNotCompute) {
+ if (NewBTI.Exact == getCouldNotCompute()) {
// We couldn't compute an exact value for this exit, so
// we won't be able to compute an exact value for the loop.
CouldNotComputeBECount = true;
- BECount = CouldNotCompute;
+ BECount = getCouldNotCompute();
} else if (!CouldNotComputeBECount) {
- if (BECount == CouldNotCompute)
+ if (BECount == getCouldNotCompute())
BECount = NewBTI.Exact;
else
BECount = getUMinFromMismatchedTypes(BECount, NewBTI.Exact);
}
- if (MaxBECount == CouldNotCompute)
+ if (MaxBECount == getCouldNotCompute())
MaxBECount = NewBTI.Max;
- else if (NewBTI.Max != CouldNotCompute)
+ else if (NewBTI.Max != getCouldNotCompute())
MaxBECount = getUMinFromMismatchedTypes(MaxBECount, NewBTI.Max);
}
//
// FIXME: we should be able to handle switch instructions (with a single exit)
BranchInst *ExitBr = dyn_cast<BranchInst>(ExitingBlock->getTerminator());
- if (ExitBr == 0) return CouldNotCompute;
+ if (ExitBr == 0) return getCouldNotCompute();
assert(ExitBr->isConditional() && "If unconditional, it can't be in loop!");
// At this point, we know we have a conditional branch that determines whether
for (BasicBlock *BB = ExitBr->getParent(); BB; ) {
BasicBlock *Pred = BB->getUniquePredecessor();
if (!Pred)
- return CouldNotCompute;
+ return getCouldNotCompute();
TerminatorInst *PredTerm = Pred->getTerminator();
for (unsigned i = 0, e = PredTerm->getNumSuccessors(); i != e; ++i) {
BasicBlock *PredSucc = PredTerm->getSuccessor(i);
// If the predecessor has a successor that isn't BB and isn't
// outside the loop, assume the worst.
if (L->contains(PredSucc))
- return CouldNotCompute;
+ return getCouldNotCompute();
}
if (Pred == L->getHeader()) {
Ok = true;
BB = Pred;
}
if (!Ok)
- return CouldNotCompute;
+ return getCouldNotCompute();
}
// Procede to the next level to examine the exit condition expression.
ComputeBackedgeTakenCountFromExitCond(L, BO->getOperand(0), TBB, FBB);
BackedgeTakenInfo BTI1 =
ComputeBackedgeTakenCountFromExitCond(L, BO->getOperand(1), TBB, FBB);
- const SCEV* BECount = CouldNotCompute;
- const SCEV* MaxBECount = CouldNotCompute;
+ const SCEV* BECount = getCouldNotCompute();
+ const SCEV* MaxBECount = getCouldNotCompute();
if (L->contains(TBB)) {
// Both conditions must be true for the loop to continue executing.
// Choose the less conservative count.
- if (BTI0.Exact == CouldNotCompute || BTI1.Exact == CouldNotCompute)
- BECount = CouldNotCompute;
+ if (BTI0.Exact == getCouldNotCompute() ||
+ BTI1.Exact == getCouldNotCompute())
+ BECount = getCouldNotCompute();
else
BECount = getUMinFromMismatchedTypes(BTI0.Exact, BTI1.Exact);
- if (BTI0.Max == CouldNotCompute)
+ if (BTI0.Max == getCouldNotCompute())
MaxBECount = BTI1.Max;
- else if (BTI1.Max == CouldNotCompute)
+ else if (BTI1.Max == getCouldNotCompute())
MaxBECount = BTI0.Max;
else
MaxBECount = getUMinFromMismatchedTypes(BTI0.Max, BTI1.Max);
} else {
// Both conditions must be true for the loop to exit.
assert(L->contains(FBB) && "Loop block has no successor in loop!");
- if (BTI0.Exact != CouldNotCompute && BTI1.Exact != CouldNotCompute)
+ if (BTI0.Exact != getCouldNotCompute() &&
+ BTI1.Exact != getCouldNotCompute())
BECount = getUMaxFromMismatchedTypes(BTI0.Exact, BTI1.Exact);
- if (BTI0.Max != CouldNotCompute && BTI1.Max != CouldNotCompute)
+ if (BTI0.Max != getCouldNotCompute() &&
+ BTI1.Max != getCouldNotCompute())
MaxBECount = getUMaxFromMismatchedTypes(BTI0.Max, BTI1.Max);
}
ComputeBackedgeTakenCountFromExitCond(L, BO->getOperand(0), TBB, FBB);
BackedgeTakenInfo BTI1 =
ComputeBackedgeTakenCountFromExitCond(L, BO->getOperand(1), TBB, FBB);
- const SCEV* BECount = CouldNotCompute;
- const SCEV* MaxBECount = CouldNotCompute;
+ const SCEV* BECount = getCouldNotCompute();
+ const SCEV* MaxBECount = getCouldNotCompute();
if (L->contains(FBB)) {
// Both conditions must be false for the loop to continue executing.
// Choose the less conservative count.
- if (BTI0.Exact == CouldNotCompute || BTI1.Exact == CouldNotCompute)
- BECount = CouldNotCompute;
+ if (BTI0.Exact == getCouldNotCompute() ||
+ BTI1.Exact == getCouldNotCompute())
+ BECount = getCouldNotCompute();
else
BECount = getUMinFromMismatchedTypes(BTI0.Exact, BTI1.Exact);
- if (BTI0.Max == CouldNotCompute)
+ if (BTI0.Max == getCouldNotCompute())
MaxBECount = BTI1.Max;
- else if (BTI1.Max == CouldNotCompute)
+ else if (BTI1.Max == getCouldNotCompute())
MaxBECount = BTI0.Max;
else
MaxBECount = getUMinFromMismatchedTypes(BTI0.Max, BTI1.Max);
} else {
// Both conditions must be false for the loop to exit.
assert(L->contains(TBB) && "Loop block has no successor in loop!");
- if (BTI0.Exact != CouldNotCompute && BTI1.Exact != CouldNotCompute)
+ if (BTI0.Exact != getCouldNotCompute() &&
+ BTI1.Exact != getCouldNotCompute())
BECount = getUMaxFromMismatchedTypes(BTI0.Exact, BTI1.Exact);
- if (BTI0.Max != CouldNotCompute && BTI1.Max != CouldNotCompute)
+ if (BTI0.Max != getCouldNotCompute() &&
+ BTI1.Max != getCouldNotCompute())
MaxBECount = getUMaxFromMismatchedTypes(BTI0.Max, BTI1.Max);
}
Constant *RHS,
const Loop *L,
ICmpInst::Predicate predicate) {
- if (LI->isVolatile()) return CouldNotCompute;
+ if (LI->isVolatile()) return getCouldNotCompute();
// Check to see if the loaded pointer is a getelementptr of a global.
GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(LI->getOperand(0));
- if (!GEP) return CouldNotCompute;
+ if (!GEP) return getCouldNotCompute();
// Make sure that it is really a constant global we are gepping, with an
// initializer, and make sure the first IDX is really 0.
if (!GV || !GV->isConstant() || !GV->hasInitializer() ||
GEP->getNumOperands() < 3 || !isa<Constant>(GEP->getOperand(1)) ||
!cast<Constant>(GEP->getOperand(1))->isNullValue())
- return CouldNotCompute;
+ return getCouldNotCompute();
// Okay, we allow one non-constant index into the GEP instruction.
Value *VarIdx = 0;
if (ConstantInt *CI = dyn_cast<ConstantInt>(GEP->getOperand(i))) {
Indexes.push_back(CI);
} else if (!isa<ConstantInt>(GEP->getOperand(i))) {
- if (VarIdx) return CouldNotCompute; // Multiple non-constant idx's.
+ if (VarIdx) return getCouldNotCompute(); // Multiple non-constant idx's.
VarIdx = GEP->getOperand(i);
VarIdxNum = i-2;
Indexes.push_back(0);
if (!IdxExpr || !IdxExpr->isAffine() || IdxExpr->isLoopInvariant(L) ||
!isa<SCEVConstant>(IdxExpr->getOperand(0)) ||
!isa<SCEVConstant>(IdxExpr->getOperand(1)))
- return CouldNotCompute;
+ return getCouldNotCompute();
unsigned MaxSteps = MaxBruteForceIterations;
for (unsigned IterationNum = 0; IterationNum != MaxSteps; ++IterationNum) {
return getConstant(ItCst); // Found terminating iteration!
}
}
- return CouldNotCompute;
+ return getCouldNotCompute();
}
/// constant number of times (the condition evolves only from constants),
/// try to evaluate a few iterations of the loop until we get the exit
/// condition gets a value of ExitWhen (true or false). If we cannot
-/// evaluate the trip count of the loop, return CouldNotCompute.
+/// evaluate the trip count of the loop, return getCouldNotCompute().
const SCEV *
ScalarEvolution::ComputeBackedgeTakenCountExhaustively(const Loop *L,
Value *Cond,
bool ExitWhen) {
PHINode *PN = getConstantEvolvingPHI(Cond, L);
- if (PN == 0) return CouldNotCompute;
+ if (PN == 0) return getCouldNotCompute();
// Since the loop is canonicalized, the PHI node must have two entries. One
// entry must be a constant (coming in from outside of the loop), and the
bool SecondIsBackedge = L->contains(PN->getIncomingBlock(1));
Constant *StartCST =
dyn_cast<Constant>(PN->getIncomingValue(!SecondIsBackedge));
- if (StartCST == 0) return CouldNotCompute; // Must be a constant.
+ if (StartCST == 0) return getCouldNotCompute(); // Must be a constant.
Value *BEValue = PN->getIncomingValue(SecondIsBackedge);
PHINode *PN2 = getConstantEvolvingPHI(BEValue, L);
- if (PN2 != PN) return CouldNotCompute; // Not derived from same PHI.
+ if (PN2 != PN) return getCouldNotCompute(); // Not derived from same PHI.
// Okay, we find a PHI node that defines the trip count of this loop. Execute
// the loop symbolically to determine when the condition gets a value of
dyn_cast_or_null<ConstantInt>(EvaluateExpression(Cond, PHIVal));
// Couldn't symbolically evaluate.
- if (!CondVal) return CouldNotCompute;
+ if (!CondVal) return getCouldNotCompute();
if (CondVal->getValue() == uint64_t(ExitWhen)) {
ConstantEvolutionLoopExitValue[PN] = PHIVal;
// Compute the value of the PHI node for the next iteration.
Constant *NextPHI = EvaluateExpression(BEValue, PHIVal);
if (NextPHI == 0 || NextPHI == PHIVal)
- return CouldNotCompute; // Couldn't evaluate or not making progress...
+ return getCouldNotCompute();// Couldn't evaluate or not making progress...
PHIVal = NextPHI;
}
// Too many iterations were needed to evaluate.
- return CouldNotCompute;
+ return getCouldNotCompute();
}
/// getSCEVAtScope - Return a SCEV expression handle for the specified value
// To evaluate this recurrence, we need to know how many times the AddRec
// loop iterates. Compute this now.
const SCEV* BackedgeTakenCount = getBackedgeTakenCount(AddRec->getLoop());
- if (BackedgeTakenCount == CouldNotCompute) return AddRec;
+ if (BackedgeTakenCount == getCouldNotCompute()) return AddRec;
// Then, evaluate the AddRec.
return AddRec->evaluateAtIteration(BackedgeTakenCount, *this);
if (const SCEVConstant *C = dyn_cast<SCEVConstant>(V)) {
// If the value is already zero, the branch will execute zero times.
if (C->getValue()->isZero()) return C;
- return CouldNotCompute; // Otherwise it will loop infinitely.
+ return getCouldNotCompute(); // Otherwise it will loop infinitely.
}
const SCEVAddRecExpr *AddRec = dyn_cast<SCEVAddRecExpr>(V);
if (!AddRec || AddRec->getLoop() != L)
- return CouldNotCompute;
+ return getCouldNotCompute();
if (AddRec->isAffine()) {
// If this is an affine expression, the execution count of this branch is
}
}
- return CouldNotCompute;
+ return getCouldNotCompute();
}
/// HowFarToNonZero - Return the number of times a backedge checking the
if (const SCEVConstant *C = dyn_cast<SCEVConstant>(V)) {
if (!C->getValue()->isNullValue())
return getIntegerSCEV(0, C->getType());
- return CouldNotCompute; // Otherwise it will loop infinitely.
+ return getCouldNotCompute(); // Otherwise it will loop infinitely.
}
// We could implement others, but I really doubt anyone writes loops like
// this, and if they did, they would already be constant folded.
- return CouldNotCompute;
+ return getCouldNotCompute();
}
/// getLoopPredecessor - If the given loop's header has exactly one unique
getAddExpr(getZeroExtendExpr(Diff, WideTy),
getZeroExtendExpr(RoundUp, WideTy));
if (getZeroExtendExpr(Add, WideTy) != OperandExtendedAdd)
- return CouldNotCompute;
+ return getCouldNotCompute();
return getUDivExpr(Add, Step);
}
ScalarEvolution::HowManyLessThans(const SCEV *LHS, const SCEV *RHS,
const Loop *L, bool isSigned) {
// Only handle: "ADDREC < LoopInvariant".
- if (!RHS->isLoopInvariant(L)) return CouldNotCompute;
+ if (!RHS->isLoopInvariant(L)) return getCouldNotCompute();
const SCEVAddRecExpr *AddRec = dyn_cast<SCEVAddRecExpr>(LHS);
if (!AddRec || AddRec->getLoop() != L)
- return CouldNotCompute;
+ return getCouldNotCompute();
if (AddRec->isAffine()) {
// FORNOW: We only support unit strides.
// TODO: handle non-constant strides.
const SCEVConstant *CStep = dyn_cast<SCEVConstant>(Step);
if (!CStep || CStep->isZero())
- return CouldNotCompute;
+ return getCouldNotCompute();
if (CStep->isOne()) {
// With unit stride, the iteration never steps past the limit value.
} else if (CStep->getValue()->getValue().isStrictlyPositive()) {
APInt Max = APInt::getSignedMaxValue(BitWidth);
if ((Max - CStep->getValue()->getValue())
.slt(CLimit->getValue()->getValue()))
- return CouldNotCompute;
+ return getCouldNotCompute();
} else {
APInt Max = APInt::getMaxValue(BitWidth);
if ((Max - CStep->getValue()->getValue())
.ult(CLimit->getValue()->getValue()))
- return CouldNotCompute;
+ return getCouldNotCompute();
}
} else
// TODO: handle non-constant limit values below.
- return CouldNotCompute;
+ return getCouldNotCompute();
} else
// TODO: handle negative strides below.
- return CouldNotCompute;
+ return getCouldNotCompute();
// We know the LHS is of the form {n,+,s} and the RHS is some loop-invariant
// m. So, we count the number of iterations in which {n,+,s} < m is true.
return BackedgeTakenInfo(BECount, MaxBECount);
}
- return CouldNotCompute;
+ return getCouldNotCompute();
}
/// getNumIterationsInRange - Return the number of iterations of this loop that
//===----------------------------------------------------------------------===//
ScalarEvolution::ScalarEvolution()
- : FunctionPass(&ID), CouldNotCompute(new SCEVCouldNotCompute()) {
+ : FunctionPass(&ID) {
}
bool ScalarEvolution::runOnFunction(Function &F) {
BackedgeTakenCounts.clear();
ConstantEvolutionLoopExitValue.clear();
ValuesAtScopes.clear();
-
- for (std::map<ConstantInt*, SCEVConstant*>::iterator
- I = SCEVConstants.begin(), E = SCEVConstants.end(); I != E; ++I)
- delete I->second;
- for (std::map<std::pair<const SCEV*, const Type*>,
- SCEVTruncateExpr*>::iterator I = SCEVTruncates.begin(),
- E = SCEVTruncates.end(); I != E; ++I)
- delete I->second;
- for (std::map<std::pair<const SCEV*, const Type*>,
- SCEVZeroExtendExpr*>::iterator I = SCEVZeroExtends.begin(),
- E = SCEVZeroExtends.end(); I != E; ++I)
- delete I->second;
- for (std::map<std::pair<unsigned, std::vector<const SCEV*> >,
- SCEVCommutativeExpr*>::iterator I = SCEVCommExprs.begin(),
- E = SCEVCommExprs.end(); I != E; ++I)
- delete I->second;
- for (std::map<std::pair<const SCEV*, const SCEV*>, SCEVUDivExpr*>::iterator
- I = SCEVUDivs.begin(), E = SCEVUDivs.end(); I != E; ++I)
- delete I->second;
- for (std::map<std::pair<const SCEV*, const Type*>,
- SCEVSignExtendExpr*>::iterator I = SCEVSignExtends.begin(),
- E = SCEVSignExtends.end(); I != E; ++I)
- delete I->second;
- for (std::map<std::pair<const Loop *, std::vector<const SCEV*> >,
- SCEVAddRecExpr*>::iterator I = SCEVAddRecExprs.begin(),
- E = SCEVAddRecExprs.end(); I != E; ++I)
- delete I->second;
- for (std::map<Value*, SCEVUnknown*>::iterator I = SCEVUnknowns.begin(),
- E = SCEVUnknowns.end(); I != E; ++I)
- delete I->second;
-
- SCEVConstants.clear();
- SCEVTruncates.clear();
- SCEVZeroExtends.clear();
- SCEVCommExprs.clear();
- SCEVUDivs.clear();
- SCEVSignExtends.clear();
- SCEVAddRecExprs.clear();
- SCEVUnknowns.clear();
+ UniqueSCEVs.clear();
+ SCEVAllocator.Reset();
}
void ScalarEvolution::getAnalysisUsage(AnalysisUsage &AU) const {
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