lib/Analysis/MemorySSA.cpp

1411     unsigned long UpperBound = VersionStack.size() - 1;
1413     if (UpperBound - LocInfo.LowerBound > MaxCheckLimit) {
1417                         << UpperBound - LocInfo.LowerBound
1426     while (UpperBound > LocInfo.LowerBound) {
1427       if (isa<MemoryPhi>(VersionStack[UpperBound])) {
1432         while (VersionStack[UpperBound] != Result) {
1433           assert(UpperBound != 0);
1434           --UpperBound;
1440       MemoryDef *MD = cast<MemoryDef>(VersionStack[UpperBound]);
1444         // Reset UpperBound to liveOnEntryDef's place in the stack
1445         UpperBound = 0;
1456       --UpperBound;
1461     // At the end of this loop, UpperBound is either a clobber, or lower bound
1463     if (FoundClobberResult || UpperBound < LocInfo.LastKill) {
1465       if (MSSA->isLiveOnEntryDef(VersionStack[UpperBound]))
1467       MU->setDefiningAccess(VersionStack[UpperBound], true, LocInfo.AR);
1468       LocInfo.LastKill = UpperBound;