//===- llvm/Analysis/ScalarEvolutionExpressions.h - SCEV Exprs --*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
//
// This file defines the classes used to represent and build scalar expressions.
-//
+//
//===----------------------------------------------------------------------===//
#ifndef LLVM_ANALYSIS_SCALAREVOLUTION_EXPRESSIONS_H
#define LLVM_ANALYSIS_SCALAREVOLUTION_EXPRESSIONS_H
#include "llvm/Analysis/ScalarEvolution.h"
+#include "llvm/Support/ErrorHandling.h"
namespace llvm {
class ConstantInt;
class ConstantRange;
+ class DominatorTree;
enum SCEVTypes {
// These should be ordered in terms of increasing complexity to make the
// folders simpler.
- scConstant, scTruncate, scZeroExtend, scAddExpr, scMulExpr, scUDivExpr,
- scAddRecExpr, scUnknown, scCouldNotCompute
+ scConstant, scTruncate, scZeroExtend, scSignExtend, scAddExpr, scMulExpr,
+ scUDivExpr, scAddRecExpr, scUMaxExpr, scSMaxExpr,
+ scUnknown, scCouldNotCompute
};
//===--------------------------------------------------------------------===//
/// SCEVConstant - This class represents a constant integer value.
///
class SCEVConstant : public SCEV {
+ friend class ScalarEvolution;
+
ConstantInt *V;
- SCEVConstant(ConstantInt *v) : SCEV(scConstant), V(v) {}
-
- virtual ~SCEVConstant();
+ SCEVConstant(const FoldingSetNodeID &ID, ConstantInt *v) :
+ SCEV(ID, scConstant), V(v) {}
public:
- /// get method - This just gets and returns a new SCEVConstant object.
- ///
- static SCEVHandle get(ConstantInt *V);
-
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;
- Value *expandCodeFor(ScalarEvolutionRewriter &SER,
- Instruction *InsertPt) {
- return (Value*)getValue();
+ virtual bool hasOperand(const SCEV *) const {
+ return false;
+ }
+
+ bool dominates(BasicBlock *BB, DominatorTree *DT) const {
+ return true;
+ }
+
+ bool properlyDominates(BasicBlock *BB, DominatorTree *DT) const {
+ return true;
}
-
- virtual void print(std::ostream &OS) const;
+
+ 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 {
- SCEVHandle Op;
+ class SCEVCastExpr : public SCEV {
+ protected:
+ const SCEV *Op;
const Type *Ty;
- SCEVTruncateExpr(const SCEVHandle &op, const Type *ty);
- virtual ~SCEVTruncateExpr();
- public:
- /// get method - This just gets and returns a new SCEVTruncate object
- ///
- static SCEVHandle get(const SCEVHandle &Op, const Type *Ty);
- const SCEVHandle &getOperand() const { return Op; }
+ SCEVCastExpr(const FoldingSetNodeID &ID,
+ unsigned SCEVTy, const SCEV *op, const Type *ty);
+
+ public:
+ const SCEV *getOperand() const { return Op; }
virtual const Type *getType() const { return Ty; }
-
+
virtual bool isLoopInvariant(const Loop *L) const {
return Op->isLoopInvariant(L);
}
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;
+ virtual bool hasOperand(const SCEV *O) const {
+ return Op == O || Op->hasOperand(O);
+ }
+
+ virtual bool dominates(BasicBlock *BB, DominatorTree *DT) const;
- Value *expandCodeFor(ScalarEvolutionRewriter &SER,
- Instruction *InsertPt);
-
- virtual void print(std::ostream &OS) const;
+ virtual bool properlyDominates(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 FoldingSetNodeID &ID,
+ const SCEV *op, const Type *ty);
+
+ public:
+ 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 {
- SCEVHandle Op;
- const Type *Ty;
- SCEVZeroExtendExpr(const SCEVHandle &op, const Type *ty);
- virtual ~SCEVZeroExtendExpr();
+ class SCEVZeroExtendExpr : public SCEVCastExpr {
+ friend class ScalarEvolution;
+
+ SCEVZeroExtendExpr(const FoldingSetNodeID &ID,
+ const SCEV *op, const Type *ty);
+
public:
- /// get method - This just gets and returns a new SCEVZeroExtend object
- ///
- static SCEVHandle get(const SCEVHandle &Op, const Type *Ty);
+ virtual void print(raw_ostream &OS) const;
- const SCEVHandle &getOperand() const { return Op; }
- virtual const Type *getType() const { return Ty; }
-
- virtual bool isLoopInvariant(const Loop *L) const {
- return Op->isLoopInvariant(L);
+ /// Methods for support type inquiry through isa, cast, and dyn_cast:
+ static inline bool classof(const SCEVZeroExtendExpr *S) { return true; }
+ static inline bool classof(const SCEV *S) {
+ return S->getSCEVType() == scZeroExtend;
}
+ };
- virtual bool hasComputableLoopEvolution(const Loop *L) const {
- return Op->hasComputableLoopEvolution(L);
- }
+ //===--------------------------------------------------------------------===//
+ /// SCEVSignExtendExpr - This class represents a sign extension of a small
+ /// integer value to a larger integer value.
+ ///
+ class SCEVSignExtendExpr : public SCEVCastExpr {
+ friend class ScalarEvolution;
- /// 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 FoldingSetNodeID &ID,
+ const SCEV *op, const Type *ty);
- Value *expandCodeFor(ScalarEvolutionRewriter &SER,
- Instruction *InsertPt);
-
- virtual void print(std::ostream &OS) const;
+ public:
+ 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; }
+ static inline bool classof(const SCEVSignExtendExpr *S) { return true; }
static inline bool classof(const SCEV *S) {
- return S->getSCEVType() == scZeroExtend;
+ return S->getSCEVType() == scSignExtend;
}
};
//===--------------------------------------------------------------------===//
- /// 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 {
- 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(const FoldingSetNodeID &ID,
+ enum SCEVTypes T, const SmallVectorImpl<const SCEV *> &ops)
+ : SCEV(ID, T), Operands(ops.begin(), ops.end()) {}
public:
- unsigned getNumOperands() const { return Operands.size(); }
- const SCEVHandle &getOperand(unsigned i) const {
+ unsigned getNumOperands() const { return (unsigned)Operands.size(); }
+ 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 - 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 {
+ bool HasVarying = false;
+ for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
+ if (!getOperand(i)->isLoopInvariant(L)) {
+ if (getOperand(i)->hasComputableLoopEvolution(L))
+ HasVarying = true;
+ else
+ return false;
+ }
+ return HasVarying;
+ }
+
+ virtual bool hasOperand(const SCEV *O) const {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
- if (getOperand(i)->hasComputableLoopEvolution(L)) return true;
+ if (O == getOperand(i) || getOperand(i)->hasOperand(O))
+ return true;
return false;
}
- virtual const char *getOperationStr() const = 0;
+ bool dominates(BasicBlock *BB, DominatorTree *DT) const;
+
+ bool properlyDominates(BasicBlock *BB, DominatorTree *DT) const;
virtual const Type *getType() const { return getOperand(0)->getType(); }
- virtual void print(std::ostream &OS) const;
+
+ bool hasNoUnsignedWrap() const { return SubclassData & (1 << 0); }
+ void setHasNoUnsignedWrap(bool B) {
+ SubclassData = (SubclassData & ~(1 << 0)) | (B << 0);
+ }
+ bool hasNoSignedWrap() const { return SubclassData & (1 << 1); }
+ void setHasNoSignedWrap(bool B) {
+ SubclassData = (SubclassData & ~(1 << 1)) | (B << 1);
+ }
/// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const SCEVCommutativeExpr *S) { return true; }
+ 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() == scMulExpr ||
+ S->getSCEVType() == scSMaxExpr ||
+ S->getSCEVType() == scUMaxExpr ||
+ S->getSCEVType() == scAddRecExpr;
}
};
-
//===--------------------------------------------------------------------===//
- /// SCEVAddExpr - This node represents an addition of some number of SCEVs.
+ /// SCEVCommutativeExpr - This node is the base class for n'ary commutative
+ /// operators.
///
- class SCEVAddExpr : public SCEVCommutativeExpr {
- SCEVAddExpr(const std::vector<SCEVHandle> &ops)
- : SCEVCommutativeExpr(scAddExpr, ops) {
- }
+ class SCEVCommutativeExpr : public SCEVNAryExpr {
+ protected:
+ SCEVCommutativeExpr(const FoldingSetNodeID &ID,
+ enum SCEVTypes T,
+ const SmallVectorImpl<const SCEV *> &ops)
+ : SCEVNAryExpr(ID, T, ops) {}
public:
- static SCEVHandle get(std::vector<SCEVHandle> &Ops);
+ virtual const char *getOperationStr() const = 0;
+
+ virtual void print(raw_ostream &OS) const;
- static SCEVHandle get(const SCEVHandle &LHS, const SCEVHandle &RHS) {
- std::vector<SCEVHandle> Ops;
- Ops.push_back(LHS);
- Ops.push_back(RHS);
- return get(Ops);
+ /// Methods for support type inquiry through isa, cast, and dyn_cast:
+ static inline bool classof(const SCEVCommutativeExpr *S) { return true; }
+ static inline bool classof(const SCEV *S) {
+ return S->getSCEVType() == scAddExpr ||
+ S->getSCEVType() == scMulExpr ||
+ S->getSCEVType() == scSMaxExpr ||
+ S->getSCEVType() == scUMaxExpr;
}
+ };
+
+
+ //===--------------------------------------------------------------------===//
+ /// SCEVAddExpr - This node represents an addition of some number of SCEVs.
+ ///
+ class SCEVAddExpr : public SCEVCommutativeExpr {
+ friend class ScalarEvolution;
- static SCEVHandle get(const SCEVHandle &Op0, const SCEVHandle &Op1,
- const SCEVHandle &Op2) {
- std::vector<SCEVHandle> Ops;
- Ops.push_back(Op0);
- Ops.push_back(Op1);
- Ops.push_back(Op2);
- return get(Ops);
+ SCEVAddExpr(const FoldingSetNodeID &ID,
+ const SmallVectorImpl<const SCEV *> &ops)
+ : SCEVCommutativeExpr(ID, scAddExpr, ops) {
}
+ public:
virtual const char *getOperationStr() const { return " + "; }
- Value *expandCodeFor(ScalarEvolutionRewriter &SER,
- Instruction *InsertPt);
+ virtual const Type *getType() const {
+ // Use the type of the last operand, which is likely to be a pointer
+ // type, if there is one. This doesn't usually matter, but it can help
+ // reduce casts when the expressions are expanded.
+ return getOperand(getNumOperands() - 1)->getType();
+ }
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVAddExpr *S) { return true; }
/// SCEVMulExpr - This node represents multiplication of some number of SCEVs.
///
class SCEVMulExpr : public SCEVCommutativeExpr {
- SCEVMulExpr(const std::vector<SCEVHandle> &ops)
- : SCEVCommutativeExpr(scMulExpr, ops) {
- }
+ friend class ScalarEvolution;
- public:
- static SCEVHandle get(std::vector<SCEVHandle> &Ops);
-
- static SCEVHandle get(const SCEVHandle &LHS, const SCEVHandle &RHS) {
- std::vector<SCEVHandle> Ops;
- Ops.push_back(LHS);
- Ops.push_back(RHS);
- return get(Ops);
+ SCEVMulExpr(const FoldingSetNodeID &ID,
+ const SmallVectorImpl<const SCEV *> &ops)
+ : SCEVCommutativeExpr(ID, scMulExpr, ops) {
}
+ public:
virtual const char *getOperationStr() const { return " * "; }
- Value *expandCodeFor(ScalarEvolutionRewriter &SER,
- Instruction *InsertPt);
-
/// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const SCEVMulExpr *S) { return true; }
static inline bool classof(const SCEV *S) {
/// SCEVUDivExpr - This class represents a binary unsigned division operation.
///
class SCEVUDivExpr : public SCEV {
- SCEVHandle LHS, RHS;
- SCEVUDivExpr(const SCEVHandle &lhs, const SCEVHandle &rhs)
- : SCEV(scUDivExpr), LHS(lhs), RHS(rhs) {}
+ friend class ScalarEvolution;
- virtual ~SCEVUDivExpr();
- public:
- /// get method - This just gets and returns a new SCEVUDiv object.
- ///
- static SCEVHandle get(const SCEVHandle &LHS, const SCEVHandle &RHS);
+ const SCEV *LHS;
+ const SCEV *RHS;
+ SCEVUDivExpr(const FoldingSetNodeID &ID, const SCEV *lhs, const SCEV *rhs)
+ : SCEV(ID, scUDivExpr), LHS(lhs), RHS(rhs) {}
- const SCEVHandle &getLHS() const { return LHS; }
- const SCEVHandle &getRHS() const { return RHS; }
+ public:
+ 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);
}
+ virtual bool hasOperand(const SCEV *O) const {
+ return O == LHS || O == RHS || LHS->hasOperand(O) || RHS->hasOperand(O);
+ }
+
+ bool dominates(BasicBlock *BB, DominatorTree *DT) const;
+
+ bool properlyDominates(BasicBlock *BB, DominatorTree *DT) const;
+
virtual const Type *getType() const;
- Value *expandCodeFor(ScalarEvolutionRewriter &SER,
- Instruction *InsertPt);
-
- void print(std::ostream &OS) const;
+ 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 {
- std::vector<SCEVHandle> Operands;
+ class SCEVAddRecExpr : public SCEVNAryExpr {
+ friend class ScalarEvolution;
+
const Loop *L;
- SCEVAddRecExpr(const std::vector<SCEVHandle> &ops, const Loop *l)
- : SCEV(scAddRecExpr), Operands(ops), L(l) {
- for (unsigned i = 0, e = Operands.size(); i != e; ++i)
+ SCEVAddRecExpr(const FoldingSetNodeID &ID,
+ const SmallVectorImpl<const SCEV *> &ops, const Loop *l)
+ : SCEVNAryExpr(ID, 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:
- static SCEVHandle get(const SCEVHandle &Start, const SCEVHandle &Step,
- const Loop *);
- static SCEVHandle get(std::vector<SCEVHandle> &Operands,
- const Loop *);
- static SCEVHandle get(const std::vector<SCEVHandle> &Operands,
- const Loop *L) {
- std::vector<SCEVHandle> NewOp(Operands);
- return get(NewOp, L);
- }
- 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 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() const {
- if (getNumOperands() == 2) return getOperand(1);
- return SCEVAddRecExpr::get(std::vector<SCEVHandle>(op_begin()+1,op_end()),
- getLoop());
+ 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 hasComputableLoopEvolution(const Loop *QL) const {
if (L == QL) return true;
- /// FIXME: What if the start or step value a recurrence for the specified
- /// loop?
return false;
}
virtual bool isLoopInvariant(const Loop *QueryLoop) const;
- virtual const Type *getType() const { return Operands[0]->getType(); }
-
- Value *expandCodeFor(ScalarEvolutionRewriter &SER,
- Instruction *InsertPt);
-
-
/// 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) 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;
+ const SCEV *getNumIterationsInRange(ConstantRange Range,
+ ScalarEvolution &SE) const;
+ /// getPostIncExpr - Return an expression representing the value of
+ /// this expression one iteration of the loop ahead.
+ const SCEVAddRecExpr *getPostIncExpr(ScalarEvolution &SE) const {
+ return cast<SCEVAddRecExpr>(SE.getAddExpr(this, getStepRecurrence(SE)));
+ }
- virtual void print(std::ostream &OS) const;
+ 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; }
}
};
+
+ //===--------------------------------------------------------------------===//
+ /// SCEVSMaxExpr - This class represents a signed maximum selection.
+ ///
+ class SCEVSMaxExpr : public SCEVCommutativeExpr {
+ friend class ScalarEvolution;
+
+ SCEVSMaxExpr(const FoldingSetNodeID &ID,
+ const SmallVectorImpl<const SCEV *> &ops)
+ : SCEVCommutativeExpr(ID, scSMaxExpr, ops) {
+ // Max never overflows.
+ setHasNoUnsignedWrap(true);
+ setHasNoSignedWrap(true);
+ }
+
+ public:
+ virtual const char *getOperationStr() const { return " smax "; }
+
+ /// Methods for support type inquiry through isa, cast, and dyn_cast:
+ static inline bool classof(const SCEVSMaxExpr *S) { return true; }
+ static inline bool classof(const SCEV *S) {
+ return S->getSCEVType() == scSMaxExpr;
+ }
+ };
+
+
+ //===--------------------------------------------------------------------===//
+ /// SCEVUMaxExpr - This class represents an unsigned maximum selection.
+ ///
+ class SCEVUMaxExpr : public SCEVCommutativeExpr {
+ friend class ScalarEvolution;
+
+ SCEVUMaxExpr(const FoldingSetNodeID &ID,
+ const SmallVectorImpl<const SCEV *> &ops)
+ : SCEVCommutativeExpr(ID, scUMaxExpr, ops) {
+ // Max never overflows.
+ setHasNoUnsignedWrap(true);
+ setHasNoSignedWrap(true);
+ }
+
+ public:
+ virtual const char *getOperationStr() const { return " umax "; }
+
+ /// Methods for support type inquiry through isa, cast, and dyn_cast:
+ static inline bool classof(const SCEVUMaxExpr *S) { return true; }
+ static inline bool classof(const SCEV *S) {
+ return S->getSCEVType() == scUMaxExpr;
+ }
+ };
+
//===--------------------------------------------------------------------===//
/// SCEVUnknown - This means that we are dealing with an entirely unknown SCEV
- /// value, and only represent it as it's LLVM Value. This is the "bottom"
+ /// value, and only represent it as its LLVM Value. This is the "bottom"
/// value for the analysis.
///
class SCEVUnknown : public SCEV {
+ friend class ScalarEvolution;
+
Value *V;
- SCEVUnknown(Value *v) : SCEV(scUnknown), V(v) {}
+ SCEVUnknown(const FoldingSetNodeID &ID, Value *v) :
+ SCEV(ID, scUnknown), V(v) {}
- protected:
- ~SCEVUnknown();
public:
- /// get method - For SCEVUnknown, this just gets and returns a new
- /// SCEVUnknown.
- static SCEVHandle get(Value *V);
-
Value *getValue() const { return V; }
- Value *expandCodeFor(ScalarEvolutionRewriter &SER,
- Instruction *InsertPt) {
- return V;
- }
+ /// isSizeOf, isAlignOf, isOffsetOf - Test whether this is a special
+ /// constant representing a type size, alignment, or field offset in
+ /// a target-independent manner, and hasn't happened to have been
+ /// folded with other operations into something unrecognizable. This
+ /// is mainly only useful for pretty-printing and other situations
+ /// where it isn't absolutely required for these to succeed.
+ bool isSizeOf(const Type *&AllocTy) const;
+ bool isAlignOf(const Type *&AllocTy) const;
+ bool isOffsetOf(const Type *&STy, Constant *&FieldNo) const;
virtual bool isLoopInvariant(const Loop *L) const;
virtual bool hasComputableLoopEvolution(const Loop *QL) const {
return false; // not computable
}
+ virtual bool hasOperand(const SCEV *) const {
+ return false;
+ }
+
+ bool dominates(BasicBlock *BB, DominatorTree *DT) const;
+
+ bool properlyDominates(BasicBlock *BB, DominatorTree *DT) const;
+
virtual const Type *getType() const;
- virtual void print(std::ostream &OS) const;
+ 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; }
return S->getSCEVType() == scUnknown;
}
};
+
+ /// SCEVVisitor - This class defines a simple visitor class that may be used
+ /// for various SCEV analysis purposes.
+ template<typename SC, typename RetVal=void>
+ struct SCEVVisitor {
+ RetVal visit(const SCEV *S) {
+ switch (S->getSCEVType()) {
+ case scConstant:
+ return ((SC*)this)->visitConstant((const SCEVConstant*)S);
+ case scTruncate:
+ return ((SC*)this)->visitTruncateExpr((const SCEVTruncateExpr*)S);
+ case scZeroExtend:
+ return ((SC*)this)->visitZeroExtendExpr((const SCEVZeroExtendExpr*)S);
+ case scSignExtend:
+ return ((SC*)this)->visitSignExtendExpr((const SCEVSignExtendExpr*)S);
+ case scAddExpr:
+ return ((SC*)this)->visitAddExpr((const SCEVAddExpr*)S);
+ case scMulExpr:
+ return ((SC*)this)->visitMulExpr((const SCEVMulExpr*)S);
+ case scUDivExpr:
+ return ((SC*)this)->visitUDivExpr((const SCEVUDivExpr*)S);
+ case scAddRecExpr:
+ return ((SC*)this)->visitAddRecExpr((const SCEVAddRecExpr*)S);
+ case scSMaxExpr:
+ return ((SC*)this)->visitSMaxExpr((const SCEVSMaxExpr*)S);
+ case scUMaxExpr:
+ return ((SC*)this)->visitUMaxExpr((const SCEVUMaxExpr*)S);
+ case scUnknown:
+ return ((SC*)this)->visitUnknown((const SCEVUnknown*)S);
+ case scCouldNotCompute:
+ return ((SC*)this)->visitCouldNotCompute((const SCEVCouldNotCompute*)S);
+ default:
+ llvm_unreachable("Unknown SCEV type!");
+ }
+ }
+
+ RetVal visitCouldNotCompute(const SCEVCouldNotCompute *S) {
+ llvm_unreachable("Invalid use of SCEVCouldNotCompute!");
+ return RetVal();
+ }
+ };
}
#endif
-
projects / oota-llvm.git / blobdiff