unsigned getFlags() const { return flags; }
void setFlags(unsigned flags) { this->flags = flags; }
+ /// Merge flags from another VNInfo
+ void mergeFlags(const VNInfo *VNI) {
+ flags = (flags | VNI->flags) & ~IS_UNUSED;
+ }
+
/// For a register interval, if this VN was definied by a copy instr
/// getCopy() returns a pointer to it, otherwise returns 0.
/// For a stack interval the behaviour of this method is undefined.
/// undefined behavior.
void setCopy(MachineInstr *c) { copy = c; }
+ /// isDefByCopy - Return true when this value was defined by a copy-like
+ /// instruction as determined by MachineInstr::isCopyLike.
+ bool isDefByCopy() const { return copy != 0; }
+
/// Returns true if one or more kills are PHI nodes.
bool hasPHIKill() const { return flags & HAS_PHI_KILL; }
/// Set the PHI kill flag on this value.
LI.print(OS);
return OS;
}
-}
+ /// ConnectedVNInfoEqClasses - Helper class that can divide VNInfos in a
+ /// LiveInterval into equivalence clases of connected components. A
+ /// LiveInterval that has multiple connected components can be broken into
+ /// multiple LiveIntervals.
+ ///
+ /// Given a LiveInterval that may have multiple connected components, run:
+ ///
+ /// unsigned numComps = ConEQ.Classify(LI);
+ /// if (numComps > 1) {
+ /// // allocate numComps-1 new LiveIntervals into LIS[1..]
+ /// ConEQ.Distribute(LIS);
+ /// }
+
+ class ConnectedVNInfoEqClasses {
+ LiveIntervals &lis_;
+
+ // Map each value number to its equivalence class.
+ // The invariant is that EqClass[x] <= x.
+ // Two values are connected iff EqClass[x] == EqClass[b].
+ SmallVector<unsigned, 8> eqClass_;
+
+ // Note that values a and b are connected.
+ void Connect(unsigned a, unsigned b);
+
+ unsigned Renumber();
+
+ public:
+ explicit ConnectedVNInfoEqClasses(LiveIntervals &lis) : lis_(lis) {}
+
+ /// Classify - Classify the values in LI into connected components.
+ /// Return the number of connected components.
+ unsigned Classify(const LiveInterval *LI);
+
+ /// getEqClass - Classify creates equivalence classes numbered 0..N. Return
+ /// the equivalence class assigned the VNI.
+ unsigned getEqClass(const VNInfo *VNI) { return eqClass_[VNI->id]; }
+
+ /// Distribute - Distribute values in LIV[0] into a separate LiveInterval
+ /// for each connected component. LIV must have a LiveInterval for each
+ /// connected component. The LiveIntervals in Liv[1..] must be empty.
+ void Distribute(LiveInterval *LIV[]);
+
+ };
+
+}
#endif