Simon Pilgrim cab21d4fa8 [DAG] computeKnownBits - Move (most) ISD::SHL handling into KnownBits::shl ...

As discussed on D90527, we should be be trying to move shift handling functionality into KnownBits to avoid code duplication in SelectionDAG/GlobalISel/ValueTracking.

The refactor to use the KnownBits fixed/min/max constant helpers allows us to hit a couple of cases that we were missing before.

We still need the getValidMinimumShiftAmountConstant case as KnownBits doesn't handle per-element vector cases.

2020-11-03 14:22:28 +00:00

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