lib/Analysis/InstructionSimplify.cpp

471   Value *CommonValue = nullptr;
480     if (!V || (CommonValue && V != CommonValue))
482     CommonValue = V;
485   return CommonValue;
511   Value *CommonValue = nullptr;
518     if (!V || (CommonValue && V != CommonValue))
520     CommonValue = V;
523   return CommonValue;
3647   Value *CommonValue = nullptr;
3657     if (CommonValue && Incoming != CommonValue)
3659     CommonValue = Incoming;
3662   // If CommonValue is null then all of the incoming values were either undef or
3664   if (!CommonValue)
3671     return ValueDominatesPHI(CommonValue, PN, Q.DT) ? CommonValue : nullptr;
3673   return CommonValue;