lib/CodeGen/LiveIntervalUnion.cpp

136     LiveUnionI.setMap(LiveUnion->getMap());
137     LiveUnionI.find(VirtRegI->start);
142   while (LiveUnionI.valid()) {
146     while (VirtRegI->start < LiveUnionI.stop() &&
147            VirtRegI->end > LiveUnionI.start()) {
149       LiveInterval *VReg = LiveUnionI.value();
157       if (!(++LiveUnionI).valid()) {
163     // The iterators are now not overlapping, LiveUnionI has been advanced
165     assert(VirtRegI->end <= LiveUnionI.start() && "Expected non-overlap");
168     VirtRegI = VirtReg->advanceTo(VirtRegI, LiveUnionI.start());
173     if (VirtRegI->start < LiveUnionI.stop())
176     // Still not overlapping. Catch up LiveUnionI.
177     LiveUnionI.advanceTo(VirtRegI->start);