}
void Module::mutateConstantPointerRef(GlobalValue *OldGV, GlobalValue *NewGV) {
+ assert(OldGV != NewGV && "Cannot mutate to the same global!");
GlobalValueRefMap::iterator I = GVRefMap->Map.find(OldGV);
assert(I != GVRefMap->Map.end() &&
"mutateConstantPointerRef; OldGV not in table!");
// Remove the old entry...
GVRefMap->Map.erase(I);
- // Insert the new entry...
- GVRefMap->Map.insert(std::make_pair(NewGV, Ref));
+ // Check to see if a CPR already exists for NewGV
+ I = GVRefMap->Map.lower_bound(NewGV);
+
+ if (I == GVRefMap->Map.end() || I->first != NewGV) {
+ // Insert the new entry...
+ GVRefMap->Map.insert(I, std::make_pair(NewGV, Ref));
+ } else {
+ // Otherwise, an entry already exists for the current global value.
+ // Completely replace the old CPR with the existing one...
+ Ref->replaceAllUsesWith(I->second);
+ delete Ref;
+ }
}