StrongPHIElimination::Node*
StrongPHIElimination::Node::getLeader() {
- Node* parentPointer = parent.getPointer();
- if (parentPointer == this)
- return this;
- Node* newParent = parentPointer->getLeader();
- parent.setPointer(newParent);
- return newParent;
+ Node* N = this;
+ Node* Parent = parent.getPointer();
+ Node* Grandparent = Parent->parent.getPointer();
+
+ while (Parent != Grandparent) {
+ N->parent.setPointer(Grandparent);
+ N = Grandparent;
+ Parent = Parent->parent.getPointer();
+ Grandparent = Parent->parent.getPointer();
+ }
+
+ return Parent;
}
unsigned StrongPHIElimination::getRegColor(unsigned Reg) {