2248     unsigned LowBits = Log2_32(BitWidth)+1;  in computeKnownBits()  local
2249     KnownZero = APInt::getHighBitsSet(BitWidth, BitWidth - LowBits);  in computeKnownBits()
2395         APInt LowBits = RA - 1;  in computeKnownBits()  local
2399         KnownZero = KnownZero2 & LowBits;  in computeKnownBits()
2400         KnownOne = KnownOne2 & LowBits;  in computeKnownBits()
2404         if (KnownZero2[BitWidth-1] || ((KnownZero2 & LowBits) == LowBits))  in computeKnownBits()
2405           KnownZero |= ~LowBits;  in computeKnownBits()
2409         if (KnownOne2[BitWidth-1] && ((KnownOne2 & LowBits) != 0))  in computeKnownBits()
2410           KnownOne |= ~LowBits;  in computeKnownBits()
2419         APInt LowBits = (RA - 1);  in computeKnownBits()  local
2423         KnownZero = KnownZero2 | ~LowBits;  in computeKnownBits()
2424         KnownOne = KnownOne2 & LowBits;  in computeKnownBits()