Simon Pilgrim c05a11108b [SelectionDAG] ComputeKnownBits - merge getValidMinimumShiftAmountConstant() and generic ISD::SHL handling. ...

As mentioned by @nikic on rGef5debac4302, we can merge the guaranteed bottom zero bits from the shifted value, and then, if a min shift amount is known, zero out the bottom bits as well.

2020-01-14 11:51:41 +00:00

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