extending the interface of Dependence slightly to support future work
llvm-svn: 185241
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@ -61,11 +61,20 @@ namespace llvm {
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/// cases (for output, flow, and anti dependences), the dependence implies
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/// cases (for output, flow, and anti dependences), the dependence implies
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/// an ordering, where the source must precede the destination; in contrast,
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/// an ordering, where the source must precede the destination; in contrast,
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/// input dependences are unordered.
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/// input dependences are unordered.
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///
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/// When a dependence graph is built, each Dependence will be a member of
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/// the set of predecessor edges for its destination instruction and a set
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/// if successor edges for its source instruction. These sets are represented
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/// as singly-linked lists, with the "next" fields stored in the dependence
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/// itelf.
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class Dependence {
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class Dependence {
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public:
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public:
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Dependence(Instruction *Source,
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Dependence(Instruction *Source,
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Instruction *Destination) :
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Instruction *Destination) :
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Src(Source), Dst(Destination) {}
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Src(Source),
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Dst(Destination),
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NextPredecessor(NULL),
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NextSuccessor(NULL) {}
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virtual ~Dependence() {}
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virtual ~Dependence() {}
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/// Dependence::DVEntry - Each level in the distance/direction vector
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/// Dependence::DVEntry - Each level in the distance/direction vector
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@ -164,11 +173,36 @@ namespace llvm {
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/// variable associated with the loop at this level.
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/// variable associated with the loop at this level.
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virtual bool isScalar(unsigned Level) const;
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virtual bool isScalar(unsigned Level) const;
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/// getNextPredecessor - Returns the value of the NextPredecessor
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/// field.
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const Dependence *getNextPredecessor() const {
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return NextPredecessor;
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}
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/// getNextSuccessor - Returns the value of the NextSuccessor
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/// field.
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const Dependence *getNextSuccessor() const {
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return NextSuccessor;
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}
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/// setNextPredecessor - Sets the value of the NextPredecessor
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/// field.
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void setNextPredecessor(const Dependence *pred) {
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NextPredecessor = pred;
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}
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/// setNextSuccessor - Sets the value of the NextSuccessor
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/// field.
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void setNextSuccessor(const Dependence *succ) {
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NextSuccessor = succ;
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}
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/// dump - For debugging purposes, dumps a dependence to OS.
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/// dump - For debugging purposes, dumps a dependence to OS.
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///
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///
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void dump(raw_ostream &OS) const;
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void dump(raw_ostream &OS) const;
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private:
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private:
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Instruction *Src, *Dst;
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Instruction *Src, *Dst;
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const Dependence *NextPredecessor, *NextSuccessor;
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friend class DependenceAnalysis;
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friend class DependenceAnalysis;
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};
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};
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