Transforms/InstCombine/InstCombineCompares.cpp

861   int LoOverflow = 0, HiOverflow = 0;
867     HiOverflow = LoOverflow = ProdOV;
868     if (!HiOverflow) {
871       HiOverflow = AddWithOverflow(HiBound, LoBound, RangeSize, false);
881       HiOverflow = LoOverflow = ProdOV;
882       if (!HiOverflow)
883         HiOverflow = AddWithOverflow(HiBound, Prod, RangeSize, true);
887       LoOverflow = HiOverflow = ProdOV ? -1 : 0;
901         HiOverflow = 1;            // [INTMIN+1, overflow)
907       HiOverflow = LoOverflow = ProdOV ? -1 : 0;
912       LoOverflow = HiOverflow = ProdOV;
913       if (!HiOverflow)
914         HiOverflow = SubWithOverflow(HiBound, Prod, RangeSize, true);
925     if (LoOverflow && HiOverflow)
927     if (HiOverflow)
936     if (LoOverflow && HiOverflow)
938     if (HiOverflow)
955     if (HiOverflow == +1)       // High bound greater than input range.
957     if (HiOverflow == -1)       // High bound less than input range.