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References

lib/CodeGen/GlobalISel/GISelKnownBits.cpp
  158     computeKnownBitsImpl(MI.getOperand(1).getReg(), Known2, DemandedElts,
  160     unsigned KnownZeroLow = Known2.countMinTrailingZeros();
  163     computeKnownBitsImpl(MI.getOperand(2).getReg(), Known2, DemandedElts,
  165     KnownZeroLow = std::min(KnownZeroLow, Known2.countMinTrailingZeros());
  172     computeKnownBitsImpl(MI.getOperand(1).getReg(), Known2, DemandedElts,
  176     APInt KnownZeroOut = (Known.Zero & Known2.Zero) | (Known.One & Known2.One);
  176     APInt KnownZeroOut = (Known.Zero & Known2.Zero) | (Known.One & Known2.One);
  178     Known.One = (Known.Zero & Known2.One) | (Known.One & Known2.Zero);
  178     Known.One = (Known.Zero & Known2.One) | (Known.One & Known2.Zero);
  197     computeKnownBitsImpl(MI.getOperand(1).getReg(), Known2, DemandedElts,
  199     unsigned KnownZeroHigh = Known2.countMinLeadingZeros();
  200     unsigned KnownZeroLow = Known2.countMinTrailingZeros();
  201     computeKnownBitsImpl(MI.getOperand(2).getReg(), Known2, DemandedElts,
  203     KnownZeroHigh = std::min(KnownZeroHigh, Known2.countMinLeadingZeros());
  204     KnownZeroLow = std::min(KnownZeroLow, Known2.countMinTrailingZeros());
  214     computeKnownBitsImpl(MI.getOperand(1).getReg(), Known2, DemandedElts,
  218     Known.One &= Known2.One;
  220     Known.Zero |= Known2.Zero;
  227     computeKnownBitsImpl(MI.getOperand(1).getReg(), Known2, DemandedElts,
  231     Known.Zero &= Known2.Zero;
  233     Known.One |= Known2.One;
  239     computeKnownBitsImpl(MI.getOperand(1).getReg(), Known2, DemandedElts,
  246         Known.countMinTrailingZeros() + Known2.countMinTrailingZeros();
  248         std::max(Known.countMinLeadingZeros() + Known2.countMinLeadingZeros(),
  263     computeKnownBitsImpl(MI.getOperand(2).getReg(), Known2, DemandedElts,
  266     Known.One &= Known2.One;
  267     Known.Zero &= Known2.Zero;