Transforms/InstCombine/InstCombineSimplifyDemanded.cpp

858   unsigned ShlAmt = ShlOp1.getZExtValue();
862   KnownZero = APInt::getBitsSet(KnownZero.getBitWidth(), 0, ShlAmt-1);
869   BitMask1 = isLshr ? (BitMask1.lshr(ShrAmt) << ShlAmt) :
870                       (BitMask1.ashr(ShrAmt) << ShlAmt);
872   if (ShrAmt <= ShlAmt) {
873     BitMask2 <<= (ShlAmt - ShrAmt);
875     BitMask2 = isLshr ? BitMask2.lshr(ShrAmt - ShlAmt):
876                         BitMask2.ashr(ShrAmt - ShlAmt);
881     if (ShrAmt == ShlAmt)
888     if (ShrAmt < ShlAmt) {
889       Constant *Amt = ConstantInt::get(VarX->getType(), ShlAmt - ShrAmt);
895       Constant *Amt = ConstantInt::get(VarX->getType(), ShrAmt - ShlAmt);