namespace llvm {
class ConstantInt;
class ConstantRange;
- class APInt;
+ class DominatorTree;
enum SCEVTypes {
// These should be ordered in terms of increasing complexity to make the
friend class ScalarEvolution;
ConstantInt *V;
- explicit SCEVConstant(ConstantInt *v) : SCEV(scConstant), V(v) {}
-
- virtual ~SCEVConstant();
+ explicit SCEVConstant(ConstantInt *v) :
+ SCEV(scConstant), V(v) {}
public:
ConstantInt *getValue() const { return V; }
- /// getValueRange - Return the tightest constant bounds that this value is
- /// known to have. This method is only valid on integer SCEV objects.
- virtual ConstantRange getValueRange() const;
-
virtual bool isLoopInvariant(const Loop *L) const {
return true;
}
virtual const Type *getType() const;
- SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
- const SCEVHandle &Conc,
+ const SCEV* replaceSymbolicValuesWithConcrete(const SCEV* Sym,
+ const SCEV* Conc,
ScalarEvolution &SE) const {
return this;
}
- virtual void print(std::ostream &OS) const;
- void print(std::ostream *OS) const { if (OS) print(*OS); }
+ bool dominates(BasicBlock *BB, DominatorTree *DT) const {
+ return true;
+ }
+
+ virtual void print(raw_ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVConstant *S) { return true; }
};
//===--------------------------------------------------------------------===//
- /// SCEVTruncateExpr - This class represents a truncation of an integer value
- /// to a smaller integer value.
+ /// SCEVCastExpr - This is the base class for unary cast operator classes.
///
- class SCEVTruncateExpr : public SCEV {
- friend class ScalarEvolution;
-
- SCEVHandle Op;
+ class SCEVCastExpr : public SCEV {
+ protected:
+ const SCEV* Op;
const Type *Ty;
- SCEVTruncateExpr(const SCEVHandle &op, const Type *ty);
- virtual ~SCEVTruncateExpr();
+
+ SCEVCastExpr(unsigned SCEVTy, const SCEV* op, const Type *ty);
+
public:
- const SCEVHandle &getOperand() const { return Op; }
+ const SCEV* getOperand() const { return Op; }
virtual const Type *getType() const { return Ty; }
virtual bool isLoopInvariant(const Loop *L) const {
return Op->hasComputableLoopEvolution(L);
}
- SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
- const SCEVHandle &Conc,
+ virtual bool dominates(BasicBlock *BB, DominatorTree *DT) const;
+
+ /// Methods for support type inquiry through isa, cast, and dyn_cast:
+ static inline bool classof(const SCEVCastExpr *S) { return true; }
+ static inline bool classof(const SCEV *S) {
+ return S->getSCEVType() == scTruncate ||
+ S->getSCEVType() == scZeroExtend ||
+ S->getSCEVType() == scSignExtend;
+ }
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// SCEVTruncateExpr - This class represents a truncation of an integer value
+ /// to a smaller integer value.
+ ///
+ class SCEVTruncateExpr : public SCEVCastExpr {
+ friend class ScalarEvolution;
+
+ SCEVTruncateExpr(const SCEV* op, const Type *ty);
+
+ public:
+ const SCEV* replaceSymbolicValuesWithConcrete(const SCEV* Sym,
+ const SCEV* Conc,
ScalarEvolution &SE) const {
- SCEVHandle H = Op->replaceSymbolicValuesWithConcrete(Sym, Conc, SE);
+ const SCEV* H = Op->replaceSymbolicValuesWithConcrete(Sym, Conc, SE);
if (H == Op)
return this;
return SE.getTruncateExpr(H, Ty);
}
- /// getValueRange - Return the tightest constant bounds that this value is
- /// known to have. This method is only valid on integer SCEV objects.
- virtual ConstantRange getValueRange() const;
-
- virtual void print(std::ostream &OS) const;
- void print(std::ostream *OS) const { if (OS) print(*OS); }
+ virtual void print(raw_ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVTruncateExpr *S) { return true; }
/// SCEVZeroExtendExpr - This class represents a zero extension of a small
/// integer value to a larger integer value.
///
- class SCEVZeroExtendExpr : public SCEV {
+ class SCEVZeroExtendExpr : public SCEVCastExpr {
friend class ScalarEvolution;
- SCEVHandle Op;
- const Type *Ty;
- SCEVZeroExtendExpr(const SCEVHandle &op, const Type *ty);
- virtual ~SCEVZeroExtendExpr();
- public:
- const SCEVHandle &getOperand() const { return Op; }
- virtual const Type *getType() const { return Ty; }
-
- virtual bool isLoopInvariant(const Loop *L) const {
- return Op->isLoopInvariant(L);
- }
-
- virtual bool hasComputableLoopEvolution(const Loop *L) const {
- return Op->hasComputableLoopEvolution(L);
- }
-
- /// getValueRange - Return the tightest constant bounds that this value is
- /// known to have. This method is only valid on integer SCEV objects.
- virtual ConstantRange getValueRange() const;
+ SCEVZeroExtendExpr(const SCEV* op, const Type *ty);
- SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
- const SCEVHandle &Conc,
+ public:
+ const SCEV* replaceSymbolicValuesWithConcrete(const SCEV* Sym,
+ const SCEV* Conc,
ScalarEvolution &SE) const {
- SCEVHandle H = Op->replaceSymbolicValuesWithConcrete(Sym, Conc, SE);
+ const SCEV* H = Op->replaceSymbolicValuesWithConcrete(Sym, Conc, SE);
if (H == Op)
return this;
return SE.getZeroExtendExpr(H, Ty);
}
- virtual void print(std::ostream &OS) const;
- void print(std::ostream *OS) const { if (OS) print(*OS); }
+ virtual void print(raw_ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVZeroExtendExpr *S) { return true; }
/// SCEVSignExtendExpr - This class represents a sign extension of a small
/// integer value to a larger integer value.
///
- class SCEVSignExtendExpr : public SCEV {
+ class SCEVSignExtendExpr : public SCEVCastExpr {
friend class ScalarEvolution;
- SCEVHandle Op;
- const Type *Ty;
- SCEVSignExtendExpr(const SCEVHandle &op, const Type *ty);
- virtual ~SCEVSignExtendExpr();
- public:
- const SCEVHandle &getOperand() const { return Op; }
- virtual const Type *getType() const { return Ty; }
-
- virtual bool isLoopInvariant(const Loop *L) const {
- return Op->isLoopInvariant(L);
- }
-
- virtual bool hasComputableLoopEvolution(const Loop *L) const {
- return Op->hasComputableLoopEvolution(L);
- }
-
- /// getValueRange - Return the tightest constant bounds that this value is
- /// known to have. This method is only valid on integer SCEV objects.
- virtual ConstantRange getValueRange() const;
+ SCEVSignExtendExpr(const SCEV* op, const Type *ty);
- SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
- const SCEVHandle &Conc,
+ public:
+ const SCEV* replaceSymbolicValuesWithConcrete(const SCEV* Sym,
+ const SCEV* Conc,
ScalarEvolution &SE) const {
- SCEVHandle H = Op->replaceSymbolicValuesWithConcrete(Sym, Conc, SE);
+ const SCEV* H = Op->replaceSymbolicValuesWithConcrete(Sym, Conc, SE);
if (H == Op)
return this;
return SE.getSignExtendExpr(H, Ty);
}
- virtual void print(std::ostream &OS) const;
- void print(std::ostream *OS) const { if (OS) print(*OS); }
+ virtual void print(raw_ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVSignExtendExpr *S) { return true; }
//===--------------------------------------------------------------------===//
- /// SCEVCommutativeExpr - This node is the base class for n'ary commutative
- /// operators.
+ /// SCEVNAryExpr - This node is a base class providing common
+ /// functionality for n'ary operators.
///
- class SCEVCommutativeExpr : public SCEV {
- friend class ScalarEvolution;
-
- std::vector<SCEVHandle> Operands;
-
+ class SCEVNAryExpr : public SCEV {
protected:
- SCEVCommutativeExpr(enum SCEVTypes T, const std::vector<SCEVHandle> &ops)
- : SCEV(T) {
- Operands.reserve(ops.size());
- Operands.insert(Operands.end(), ops.begin(), ops.end());
- }
- ~SCEVCommutativeExpr();
+ SmallVector<const SCEV*, 8> Operands;
+
+ SCEVNAryExpr(enum SCEVTypes T, const SmallVectorImpl<const SCEV*> &ops)
+ : SCEV(T), Operands(ops.begin(), ops.end()) {}
public:
unsigned getNumOperands() const { return (unsigned)Operands.size(); }
- const SCEVHandle &getOperand(unsigned i) const {
+ const SCEV* getOperand(unsigned i) const {
assert(i < Operands.size() && "Operand index out of range!");
return Operands[i];
}
- const std::vector<SCEVHandle> &getOperands() const { return Operands; }
- typedef std::vector<SCEVHandle>::const_iterator op_iterator;
+ const SmallVectorImpl<const SCEV*> &getOperands() const { return Operands; }
+ typedef SmallVectorImpl<const SCEV*>::const_iterator op_iterator;
op_iterator op_begin() const { return Operands.begin(); }
op_iterator op_end() const { return Operands.end(); }
-
virtual bool isLoopInvariant(const Loop *L) const {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
if (!getOperand(i)->isLoopInvariant(L)) return false;
return true;
}
- // hasComputableLoopEvolution - Commutative expressions have computable loop
+ // hasComputableLoopEvolution - N-ary expressions have computable loop
// evolutions iff they have at least one operand that varies with the loop,
// but that all varying operands are computable.
virtual bool hasComputableLoopEvolution(const Loop *L) const {
return HasVarying;
}
- SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
- const SCEVHandle &Conc,
+ bool dominates(BasicBlock *BB, DominatorTree *DT) const;
+
+ virtual const Type *getType() const { return getOperand(0)->getType(); }
+
+ /// Methods for support type inquiry through isa, cast, and dyn_cast:
+ static inline bool classof(const SCEVNAryExpr *S) { return true; }
+ static inline bool classof(const SCEV *S) {
+ return S->getSCEVType() == scAddExpr ||
+ S->getSCEVType() == scMulExpr ||
+ S->getSCEVType() == scSMaxExpr ||
+ S->getSCEVType() == scUMaxExpr ||
+ S->getSCEVType() == scAddRecExpr;
+ }
+ };
+
+ //===--------------------------------------------------------------------===//
+ /// SCEVCommutativeExpr - This node is the base class for n'ary commutative
+ /// operators.
+ ///
+ class SCEVCommutativeExpr : public SCEVNAryExpr {
+ protected:
+ SCEVCommutativeExpr(enum SCEVTypes T,
+ const SmallVectorImpl<const SCEV*> &ops)
+ : SCEVNAryExpr(T, ops) {}
+
+ public:
+ const SCEV* replaceSymbolicValuesWithConcrete(const SCEV* Sym,
+ const SCEV* Conc,
ScalarEvolution &SE) const;
virtual const char *getOperationStr() const = 0;
- virtual const Type *getType() const { return getOperand(0)->getType(); }
- virtual void print(std::ostream &OS) const;
- void print(std::ostream *OS) const { if (OS) print(*OS); }
+ virtual void print(raw_ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVCommutativeExpr *S) { return true; }
class SCEVAddExpr : public SCEVCommutativeExpr {
friend class ScalarEvolution;
- explicit SCEVAddExpr(const std::vector<SCEVHandle> &ops)
+ explicit SCEVAddExpr(const SmallVectorImpl<const SCEV*> &ops)
: SCEVCommutativeExpr(scAddExpr, ops) {
}
class SCEVMulExpr : public SCEVCommutativeExpr {
friend class ScalarEvolution;
- explicit SCEVMulExpr(const std::vector<SCEVHandle> &ops)
+ explicit SCEVMulExpr(const SmallVectorImpl<const SCEV*> &ops)
: SCEVCommutativeExpr(scMulExpr, ops) {
}
class SCEVUDivExpr : public SCEV {
friend class ScalarEvolution;
- SCEVHandle LHS, RHS;
- SCEVUDivExpr(const SCEVHandle &lhs, const SCEVHandle &rhs)
+ const SCEV* LHS;
+ const SCEV* RHS;
+ SCEVUDivExpr(const SCEV* lhs, const SCEV* rhs)
: SCEV(scUDivExpr), LHS(lhs), RHS(rhs) {}
- virtual ~SCEVUDivExpr();
public:
- const SCEVHandle &getLHS() const { return LHS; }
- const SCEVHandle &getRHS() const { return RHS; }
+ const SCEV* getLHS() const { return LHS; }
+ const SCEV* getRHS() const { return RHS; }
virtual bool isLoopInvariant(const Loop *L) const {
return LHS->isLoopInvariant(L) && RHS->isLoopInvariant(L);
RHS->hasComputableLoopEvolution(L);
}
- SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
- const SCEVHandle &Conc,
+ const SCEV* replaceSymbolicValuesWithConcrete(const SCEV* Sym,
+ const SCEV* Conc,
ScalarEvolution &SE) const {
- SCEVHandle L = LHS->replaceSymbolicValuesWithConcrete(Sym, Conc, SE);
- SCEVHandle R = RHS->replaceSymbolicValuesWithConcrete(Sym, Conc, SE);
+ const SCEV* L = LHS->replaceSymbolicValuesWithConcrete(Sym, Conc, SE);
+ const SCEV* R = RHS->replaceSymbolicValuesWithConcrete(Sym, Conc, SE);
if (L == LHS && R == RHS)
return this;
else
return SE.getUDivExpr(L, R);
}
+ bool dominates(BasicBlock *BB, DominatorTree *DT) const;
virtual const Type *getType() const;
- void print(std::ostream &OS) const;
- void print(std::ostream *OS) const { if (OS) print(*OS); }
+ void print(raw_ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVUDivExpr *S) { return true; }
//===--------------------------------------------------------------------===//
/// SCEVAddRecExpr - This node represents a polynomial recurrence on the trip
- /// count of the specified loop.
+ /// count of the specified loop. This is the primary focus of the
+ /// ScalarEvolution framework; all the other SCEV subclasses are mostly just
+ /// supporting infrastructure to allow SCEVAddRecExpr expressions to be
+ /// created and analyzed.
///
/// All operands of an AddRec are required to be loop invariant.
///
- class SCEVAddRecExpr : public SCEV {
+ class SCEVAddRecExpr : public SCEVNAryExpr {
friend class ScalarEvolution;
- std::vector<SCEVHandle> Operands;
const Loop *L;
- SCEVAddRecExpr(const std::vector<SCEVHandle> &ops, const Loop *l)
- : SCEV(scAddRecExpr), Operands(ops), L(l) {
+ SCEVAddRecExpr(const SmallVectorImpl<const SCEV*> &ops, const Loop *l)
+ : SCEVNAryExpr(scAddRecExpr, ops), L(l) {
for (size_t i = 0, e = Operands.size(); i != e; ++i)
assert(Operands[i]->isLoopInvariant(l) &&
"Operands of AddRec must be loop-invariant!");
}
- ~SCEVAddRecExpr();
- public:
- typedef std::vector<SCEVHandle>::const_iterator op_iterator;
- op_iterator op_begin() const { return Operands.begin(); }
- op_iterator op_end() const { return Operands.end(); }
- unsigned getNumOperands() const { return (unsigned)Operands.size(); }
- const SCEVHandle &getOperand(unsigned i) const { return Operands[i]; }
- const SCEVHandle &getStart() const { return Operands[0]; }
+ public:
+ const SCEV* getStart() const { return Operands[0]; }
const Loop *getLoop() const { return L; }
-
/// getStepRecurrence - This method constructs and returns the recurrence
/// indicating how much this expression steps by. If this is a polynomial
/// of degree N, it returns a chrec of degree N-1.
- SCEVHandle getStepRecurrence(ScalarEvolution &SE) const {
- if (getNumOperands() == 2) return getOperand(1);
- return SE.getAddRecExpr(std::vector<SCEVHandle>(op_begin()+1,op_end()),
+ const SCEV* getStepRecurrence(ScalarEvolution &SE) const {
+ if (isAffine()) return getOperand(1);
+ return SE.getAddRecExpr(SmallVector<const SCEV*, 3>(op_begin()+1,op_end()),
getLoop());
}
virtual bool isLoopInvariant(const Loop *QueryLoop) const;
- virtual const Type *getType() const { return Operands[0]->getType(); }
-
/// isAffine - Return true if this is an affine AddRec (i.e., it represents
/// an expressions A+B*x where A and B are loop invariant values.
bool isAffine() const {
/// evaluateAtIteration - Return the value of this chain of recurrences at
/// the specified iteration number.
- SCEVHandle evaluateAtIteration(SCEVHandle It, ScalarEvolution &SE) const;
+ const SCEV* evaluateAtIteration(const SCEV* It, ScalarEvolution &SE) const;
/// getNumIterationsInRange - Return the number of iterations of this loop
/// that produce values in the specified constant range. Another way of
/// value is not in the condition, thus computing the exit count. If the
/// iteration count can't be computed, an instance of SCEVCouldNotCompute is
/// returned.
- SCEVHandle getNumIterationsInRange(ConstantRange Range,
+ const SCEV* getNumIterationsInRange(ConstantRange Range,
ScalarEvolution &SE) const;
- SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
- const SCEVHandle &Conc,
+ const SCEV* replaceSymbolicValuesWithConcrete(const SCEV* Sym,
+ const SCEV* Conc,
ScalarEvolution &SE) const;
- virtual void print(std::ostream &OS) const;
- void print(std::ostream *OS) const { if (OS) print(*OS); }
+ virtual void print(raw_ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVAddRecExpr *S) { return true; }
class SCEVSMaxExpr : public SCEVCommutativeExpr {
friend class ScalarEvolution;
- explicit SCEVSMaxExpr(const std::vector<SCEVHandle> &ops)
+ explicit SCEVSMaxExpr(const SmallVectorImpl<const SCEV*> &ops)
: SCEVCommutativeExpr(scSMaxExpr, ops) {
}
class SCEVUMaxExpr : public SCEVCommutativeExpr {
friend class ScalarEvolution;
- explicit SCEVUMaxExpr(const std::vector<SCEVHandle> &ops)
+ explicit SCEVUMaxExpr(const SmallVectorImpl<const SCEV*> &ops)
: SCEVCommutativeExpr(scUMaxExpr, ops) {
}
friend class ScalarEvolution;
Value *V;
- explicit SCEVUnknown(Value *v) : SCEV(scUnknown), V(v) {}
-
- protected:
- ~SCEVUnknown();
+ explicit SCEVUnknown(Value *v) :
+ SCEV(scUnknown), V(v) {}
+
public:
Value *getValue() const { return V; }
return false; // not computable
}
- SCEVHandle replaceSymbolicValuesWithConcrete(const SCEVHandle &Sym,
- const SCEVHandle &Conc,
+ const SCEV* replaceSymbolicValuesWithConcrete(const SCEV* Sym,
+ const SCEV* Conc,
ScalarEvolution &SE) const {
if (&*Sym == this) return Conc;
return this;
}
+ bool dominates(BasicBlock *BB, DominatorTree *DT) const;
+
virtual const Type *getType() const;
- virtual void print(std::ostream &OS) const;
- void print(std::ostream *OS) const { if (OS) print(*OS); }
+ virtual void print(raw_ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVUnknown *S) { return true; }
/// for various SCEV analysis purposes.
template<typename SC, typename RetVal=void>
struct SCEVVisitor {
- RetVal visit(SCEV *S) {
+ RetVal visit(const SCEV *S) {
switch (S->getSCEVType()) {
case scConstant:
- return ((SC*)this)->visitConstant((SCEVConstant*)S);
+ return ((SC*)this)->visitConstant((const SCEVConstant*)S);
case scTruncate:
- return ((SC*)this)->visitTruncateExpr((SCEVTruncateExpr*)S);
+ return ((SC*)this)->visitTruncateExpr((const SCEVTruncateExpr*)S);
case scZeroExtend:
- return ((SC*)this)->visitZeroExtendExpr((SCEVZeroExtendExpr*)S);
+ return ((SC*)this)->visitZeroExtendExpr((const SCEVZeroExtendExpr*)S);
case scSignExtend:
- return ((SC*)this)->visitSignExtendExpr((SCEVSignExtendExpr*)S);
+ return ((SC*)this)->visitSignExtendExpr((const SCEVSignExtendExpr*)S);
case scAddExpr:
- return ((SC*)this)->visitAddExpr((SCEVAddExpr*)S);
+ return ((SC*)this)->visitAddExpr((const SCEVAddExpr*)S);
case scMulExpr:
- return ((SC*)this)->visitMulExpr((SCEVMulExpr*)S);
+ return ((SC*)this)->visitMulExpr((const SCEVMulExpr*)S);
case scUDivExpr:
- return ((SC*)this)->visitUDivExpr((SCEVUDivExpr*)S);
+ return ((SC*)this)->visitUDivExpr((const SCEVUDivExpr*)S);
case scAddRecExpr:
- return ((SC*)this)->visitAddRecExpr((SCEVAddRecExpr*)S);
+ return ((SC*)this)->visitAddRecExpr((const SCEVAddRecExpr*)S);
case scSMaxExpr:
- return ((SC*)this)->visitSMaxExpr((SCEVSMaxExpr*)S);
+ return ((SC*)this)->visitSMaxExpr((const SCEVSMaxExpr*)S);
case scUMaxExpr:
- return ((SC*)this)->visitUMaxExpr((SCEVUMaxExpr*)S);
+ return ((SC*)this)->visitUMaxExpr((const SCEVUMaxExpr*)S);
case scUnknown:
- return ((SC*)this)->visitUnknown((SCEVUnknown*)S);
+ return ((SC*)this)->visitUnknown((const SCEVUnknown*)S);
case scCouldNotCompute:
- return ((SC*)this)->visitCouldNotCompute((SCEVCouldNotCompute*)S);
+ return ((SC*)this)->visitCouldNotCompute((const SCEVCouldNotCompute*)S);
default:
assert(0 && "Unknown SCEV type!");
abort();
}
}
- RetVal visitCouldNotCompute(SCEVCouldNotCompute *S) {
+ RetVal visitCouldNotCompute(const SCEVCouldNotCompute *S) {
assert(0 && "Invalid use of SCEVCouldNotCompute!");
abort();
return RetVal();
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