+ // Output known-0 bits are known if clear or set in both the LHS & RHS.
+ APInt IKnownZero = (RHSKnownZero & LHSKnownZero) |
+ (RHSKnownOne & LHSKnownOne);
+ // Output known-1 are known to be set if set in only one of the LHS, RHS.
+ APInt IKnownOne = (RHSKnownZero & LHSKnownOne) |
+ (RHSKnownOne & LHSKnownZero);
+
+ // If the client is only demanding bits that we know, return the known
+ // constant.
+ if ((DemandedMask & (IKnownZero|IKnownOne)) == DemandedMask)
+ return Constant::getIntegerValue(VTy, IKnownOne);
+