// Iterate through the basic block, recording all users of each
// pairable instruction.
- BasicBlock::iterator E = BB.end();
+ BasicBlock::iterator E = BB.end(), EL =
+ BasicBlock::iterator(cast<Instruction>(PairableInsts.back()));
for (BasicBlock::iterator I = BB.getFirstInsertionPt(); I != E; ++I) {
if (IsInPair.find(I) == IsInPair.end()) continue;
DenseSet<Value *> Users;
AliasSetTracker WriteSet(*AA);
- for (BasicBlock::iterator J = llvm::next(I); J != E; ++J)
+ for (BasicBlock::iterator J = llvm::next(I); J != E; ++J) {
(void) trackUsesOfI(Users, WriteSet, I, J);
+ if (J == EL)
+ break;
+ }
+
for (DenseSet<Value *>::iterator U = Users.begin(), E = Users.end();
U != E; ++U) {
if (IsInPair.find(*U) == IsInPair.end()) continue;
PairableInstUsers.insert(ValuePair(I, *U));
}
+
+ if (I == EL)
+ break;
}
}