897   APInt LHSKnownZero(BitWidth, 0);  in WillNotOverflowSignedAdd()  local
899   computeKnownBits(LHS, LHSKnownZero, LHSKnownOne, 0, &CxtI);  in WillNotOverflowSignedAdd()
908       (LHSKnownZero[BitWidth - 1] && RHSKnownOne[BitWidth - 1]))  in WillNotOverflowSignedAdd()
912   if (checkRippleForAdd(LHSKnownZero, RHSKnownZero))  in WillNotOverflowSignedAdd()
914   if (checkRippleForAdd(RHSKnownZero, LHSKnownZero))  in WillNotOverflowSignedAdd()
934   APInt LHSKnownZero(BitWidth, 0);  in WillNotOverflowSignedSub()  local
936   computeKnownBits(LHS, LHSKnownZero, LHSKnownOne, 0, &CxtI);  in WillNotOverflowSignedSub()
945       (LHSKnownZero[BitWidth - 1] && RHSKnownZero[BitWidth - 1]))  in WillNotOverflowSignedSub()
1092         APInt LHSKnownZero(IT->getBitWidth(), 0);  in visitAdd()  local
1093         computeKnownBits(XorLHS, LHSKnownZero, LHSKnownOne, 0, &I);  in visitAdd()
1094         if ((XorRHS->getValue() | LHSKnownZero).isAllOnesValue())  in visitAdd()