lib/Analysis/ValueTracking.cpp

551         APInt LowBits = RA - 1;
555         KnownZero = KnownZero2 & LowBits;
556         KnownOne = KnownOne2 & LowBits;
560         if (KnownZero2[BitWidth-1] || ((KnownZero2 & LowBits) == LowBits))
561           KnownZero |= ~LowBits;
565         if (KnownOne2[BitWidth-1] && ((KnownOne2 & LowBits) != 0))
566           KnownOne |= ~LowBits;
588         APInt LowBits = (RA - 1);
592         KnownZero |= ~LowBits;
593         KnownOne &= LowBits;
751         unsigned LowBits = Log2_32(BitWidth)+1;
754           LowBits -= 1;
755         KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);
759         unsigned LowBits = Log2_32(BitWidth)+1;
760         KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);