// folders simpler.
scConstant, scTruncate, scZeroExtend, scSignExtend, scAddExpr, scMulExpr,
scUDivExpr, scAddRecExpr, scUMaxExpr, scSMaxExpr,
- scFieldOffset, scAllocSize, scUnknown, scCouldNotCompute
+ scUnknown, scCouldNotCompute
};
//===--------------------------------------------------------------------===//
friend class ScalarEvolution;
ConstantInt *V;
- SCEVConstant(const FoldingSetNodeID &ID, ConstantInt *v) :
+ SCEVConstant(const FoldingSetNodeIDRef ID, ConstantInt *v) :
SCEV(ID, scConstant), V(v) {}
public:
ConstantInt *getValue() const { return V; }
- virtual bool isLoopInvariant(const Loop *L) const {
- return true;
- }
-
- virtual bool hasComputableLoopEvolution(const Loop *L) const {
- return false; // Not loop variant
- }
-
virtual const Type *getType() const;
virtual bool hasOperand(const SCEV *) const {
const SCEV *Op;
const Type *Ty;
- SCEVCastExpr(const FoldingSetNodeID &ID,
+ SCEVCastExpr(const FoldingSetNodeIDRef 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);
- }
-
- virtual bool hasComputableLoopEvolution(const Loop *L) const {
- return Op->hasComputableLoopEvolution(L);
- }
-
virtual bool hasOperand(const SCEV *O) const {
return Op == O || Op->hasOperand(O);
}
class SCEVTruncateExpr : public SCEVCastExpr {
friend class ScalarEvolution;
- SCEVTruncateExpr(const FoldingSetNodeID &ID,
+ SCEVTruncateExpr(const FoldingSetNodeIDRef ID,
const SCEV *op, const Type *ty);
public:
class SCEVZeroExtendExpr : public SCEVCastExpr {
friend class ScalarEvolution;
- SCEVZeroExtendExpr(const FoldingSetNodeID &ID,
+ SCEVZeroExtendExpr(const FoldingSetNodeIDRef ID,
const SCEV *op, const Type *ty);
public:
class SCEVSignExtendExpr : public SCEVCastExpr {
friend class ScalarEvolution;
- SCEVSignExtendExpr(const FoldingSetNodeID &ID,
+ SCEVSignExtendExpr(const FoldingSetNodeIDRef ID,
const SCEV *op, const Type *ty);
public:
///
class SCEVNAryExpr : public SCEV {
protected:
- SmallVector<const SCEV *, 8> Operands;
+ // Since SCEVs are immutable, ScalarEvolution allocates operand
+ // arrays with its SCEVAllocator, so this class just needs a simple
+ // pointer rather than a more elaborate vector-like data structure.
+ // This also avoids the need for a non-trivial destructor.
+ const SCEV *const *Operands;
+ size_t NumOperands;
- SCEVNAryExpr(const FoldingSetNodeID &ID,
- enum SCEVTypes T, const SmallVectorImpl<const SCEV *> &ops)
- : SCEV(ID, T), Operands(ops.begin(), ops.end()) {}
+ SCEVNAryExpr(const FoldingSetNodeIDRef ID,
+ enum SCEVTypes T, const SCEV *const *O, size_t N)
+ : SCEV(ID, T), Operands(O), NumOperands(N) {}
public:
- unsigned getNumOperands() const { return (unsigned)Operands.size(); }
+ size_t getNumOperands() const { return NumOperands; }
const SCEV *getOperand(unsigned i) const {
- assert(i < Operands.size() && "Operand index out of range!");
+ assert(i < NumOperands && "Operand index out of range!");
return Operands[i];
}
- 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(); }
+ typedef const SCEV *const *op_iterator;
+ op_iterator op_begin() const { return Operands; }
+ op_iterator op_end() const { return Operands + NumOperands; }
- 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 (O == getOperand(i) || getOperand(i)->hasOperand(O))
- return true;
- return false;
- }
+ virtual bool hasOperand(const SCEV *O) const;
bool dominates(BasicBlock *BB, DominatorTree *DT) const;
virtual const Type *getType() const { return getOperand(0)->getType(); }
+ 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 SCEVNAryExpr *S) { return true; }
static inline bool classof(const SCEV *S) {
///
class SCEVCommutativeExpr : public SCEVNAryExpr {
protected:
- SCEVCommutativeExpr(const FoldingSetNodeID &ID,
- enum SCEVTypes T,
- const SmallVectorImpl<const SCEV *> &ops)
- : SCEVNAryExpr(ID, T, ops) {}
+ SCEVCommutativeExpr(const FoldingSetNodeIDRef ID,
+ enum SCEVTypes T, const SCEV *const *O, size_t N)
+ : SCEVNAryExpr(ID, T, O, N) {}
public:
virtual const char *getOperationStr() const = 0;
class SCEVAddExpr : public SCEVCommutativeExpr {
friend class ScalarEvolution;
- SCEVAddExpr(const FoldingSetNodeID &ID,
- const SmallVectorImpl<const SCEV *> &ops)
- : SCEVCommutativeExpr(ID, scAddExpr, ops) {
+ SCEVAddExpr(const FoldingSetNodeIDRef ID,
+ const SCEV *const *O, size_t N)
+ : SCEVCommutativeExpr(ID, scAddExpr, O, N) {
}
public:
virtual const char *getOperationStr() const { return " + "; }
+ 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; }
static inline bool classof(const SCEV *S) {
class SCEVMulExpr : public SCEVCommutativeExpr {
friend class ScalarEvolution;
- SCEVMulExpr(const FoldingSetNodeID &ID,
- const SmallVectorImpl<const SCEV *> &ops)
- : SCEVCommutativeExpr(ID, scMulExpr, ops) {
+ SCEVMulExpr(const FoldingSetNodeIDRef ID,
+ const SCEV *const *O, size_t N)
+ : SCEVCommutativeExpr(ID, scMulExpr, O, N) {
}
public:
const SCEV *LHS;
const SCEV *RHS;
- SCEVUDivExpr(const FoldingSetNodeID &ID, const SCEV *lhs, const SCEV *rhs)
+ SCEVUDivExpr(const FoldingSetNodeIDRef ID, const SCEV *lhs, const SCEV *rhs)
: SCEV(ID, scUDivExpr), LHS(lhs), RHS(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);
- }
-
- virtual bool hasComputableLoopEvolution(const Loop *L) const {
- return LHS->hasComputableLoopEvolution(L) &&
- RHS->hasComputableLoopEvolution(L);
- }
-
virtual bool hasOperand(const SCEV *O) const {
return O == LHS || O == RHS || LHS->hasOperand(O) || RHS->hasOperand(O);
}
const Loop *L;
- 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(const FoldingSetNodeIDRef ID,
+ const SCEV *const *O, size_t N, const Loop *l)
+ : SCEVNAryExpr(ID, scAddRecExpr, O, N), L(l) {}
public:
const SCEV *getStart() const { return Operands[0]; }
getLoop());
}
- virtual bool hasComputableLoopEvolution(const Loop *QL) const {
- if (L == QL) return true;
- return false;
- }
+ bool dominates(BasicBlock *BB, DominatorTree *DT) const;
- virtual bool isLoopInvariant(const Loop *QueryLoop) const;
+ bool properlyDominates(BasicBlock *BB, DominatorTree *DT) const;
/// 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.
return cast<SCEVAddRecExpr>(SE.getAddExpr(this, getStepRecurrence(SE)));
}
- 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);
- }
-
virtual void print(raw_ostream &OS) const;
/// Methods for support type inquiry through isa, cast, and dyn_cast:
class SCEVSMaxExpr : public SCEVCommutativeExpr {
friend class ScalarEvolution;
- SCEVSMaxExpr(const FoldingSetNodeID &ID,
- const SmallVectorImpl<const SCEV *> &ops)
- : SCEVCommutativeExpr(ID, scSMaxExpr, ops) {
+ SCEVSMaxExpr(const FoldingSetNodeIDRef ID,
+ const SCEV *const *O, size_t N)
+ : SCEVCommutativeExpr(ID, scSMaxExpr, O, N) {
+ // Max never overflows.
+ setHasNoUnsignedWrap(true);
+ setHasNoSignedWrap(true);
}
public:
class SCEVUMaxExpr : public SCEVCommutativeExpr {
friend class ScalarEvolution;
- SCEVUMaxExpr(const FoldingSetNodeID &ID,
- const SmallVectorImpl<const SCEV *> &ops)
- : SCEVCommutativeExpr(ID, scUMaxExpr, ops) {
+ SCEVUMaxExpr(const FoldingSetNodeIDRef ID,
+ const SCEV *const *O, size_t N)
+ : SCEVCommutativeExpr(ID, scUMaxExpr, O, N) {
+ // Max never overflows.
+ setHasNoUnsignedWrap(true);
+ setHasNoSignedWrap(true);
}
public:
}
};
- //===--------------------------------------------------------------------===//
- /// SCEVTargetDataConstant - This node is the base class for representing
- /// target-dependent values in a target-independent way.
- ///
- class SCEVTargetDataConstant : public SCEV {
- protected:
- const Type *Ty;
- SCEVTargetDataConstant(const FoldingSetNodeID &ID, enum SCEVTypes T,
- const Type *ty) :
- SCEV(ID, T), Ty(ty) {}
-
- public:
- virtual bool isLoopInvariant(const Loop *) const { return true; }
- virtual bool hasComputableLoopEvolution(const Loop *) const {
- return false; // not computable
- }
-
- virtual bool hasOperand(const SCEV *) const {
- return false;
- }
-
- bool dominates(BasicBlock *, DominatorTree *) const {
- return true;
- }
-
- bool properlyDominates(BasicBlock *, DominatorTree *) const {
- return true;
- }
-
- virtual const Type *getType() const { return Ty; }
-
- /// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const SCEVTargetDataConstant *S) { return true; }
- static inline bool classof(const SCEV *S) {
- return S->getSCEVType() == scFieldOffset ||
- S->getSCEVType() == scAllocSize;
- }
- };
-
- //===--------------------------------------------------------------------===//
- /// SCEVFieldOffsetExpr - This node represents an offsetof expression.
- ///
- class SCEVFieldOffsetExpr : public SCEVTargetDataConstant {
- friend class ScalarEvolution;
-
- const StructType *STy;
- unsigned FieldNo;
- SCEVFieldOffsetExpr(const FoldingSetNodeID &ID, const Type *ty,
- const StructType *sty, unsigned fieldno) :
- SCEVTargetDataConstant(ID, scFieldOffset, ty),
- STy(sty), FieldNo(fieldno) {}
-
- public:
- const StructType *getStructType() const { return STy; }
- unsigned getFieldNo() const { return FieldNo; }
-
- virtual void print(raw_ostream &OS) const;
-
- /// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const SCEVFieldOffsetExpr *S) { return true; }
- static inline bool classof(const SCEV *S) {
- return S->getSCEVType() == scFieldOffset;
- }
- };
-
- //===--------------------------------------------------------------------===//
- /// SCEVAllocSize - This node represents a sizeof expression.
- ///
- class SCEVAllocSizeExpr : public SCEVTargetDataConstant {
- friend class ScalarEvolution;
-
- const Type *AllocTy;
- SCEVAllocSizeExpr(const FoldingSetNodeID &ID,
- const Type *ty, const Type *allocty) :
- SCEVTargetDataConstant(ID, scAllocSize, ty),
- AllocTy(allocty) {}
-
- public:
- const Type *getAllocType() const { return AllocTy; }
-
- virtual void print(raw_ostream &OS) const;
-
- /// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const SCEVAllocSizeExpr *S) { return true; }
- static inline bool classof(const SCEV *S) {
- return S->getSCEVType() == scAllocSize;
- }
- };
-
//===--------------------------------------------------------------------===//
/// SCEVUnknown - This means that we are dealing with an entirely unknown SCEV
/// value, and only represent it as its LLVM Value. This is the "bottom"
/// value for the analysis.
///
- class SCEVUnknown : public SCEV {
+ class SCEVUnknown : public SCEV, private CallbackVH {
friend class ScalarEvolution;
- Value *V;
- SCEVUnknown(const FoldingSetNodeID &ID, Value *v) :
- SCEV(ID, scUnknown), V(v) {}
+ // Implement CallbackVH.
+ virtual void deleted();
+ virtual void allUsesReplacedWith(Value *New);
- public:
- Value *getValue() const { return V; }
+ /// SE - The parent ScalarEvolution value. This is used to update
+ /// the parent's maps when the value associated with a SCEVUnknown
+ /// is deleted or RAUW'd.
+ ScalarEvolution *SE;
- virtual bool isLoopInvariant(const Loop *L) const;
- virtual bool hasComputableLoopEvolution(const Loop *QL) const {
- return false; // not computable
- }
+ /// Next - The next pointer in the linked list of all
+ /// SCEVUnknown instances owned by a ScalarEvolution.
+ SCEVUnknown *Next;
+
+ SCEVUnknown(const FoldingSetNodeIDRef ID, Value *V,
+ ScalarEvolution *se, SCEVUnknown *next) :
+ SCEV(ID, scUnknown), CallbackVH(V), SE(se), Next(next) {}
+
+ public:
+ Value *getValue() const { return getValPtr(); }
+
+ /// 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 hasOperand(const SCEV *) const {
return false;
return ((SC*)this)->visitSMaxExpr((const SCEVSMaxExpr*)S);
case scUMaxExpr:
return ((SC*)this)->visitUMaxExpr((const SCEVUMaxExpr*)S);
- case scFieldOffset:
- return ((SC*)this)->visitFieldOffsetExpr((const SCEVFieldOffsetExpr*)S);
- case scAllocSize:
- return ((SC*)this)->visitAllocSizeExpr((const SCEVAllocSizeExpr*)S);
case scUnknown:
return ((SC*)this)->visitUnknown((const SCEVUnknown*)S);
case scCouldNotCompute:
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