Simon Pilgrim b53ea2b9c5 [DAG] visitAND - fold (and (any_ext V), c) -> (zero_ext (and (trunc V), c)) if profitable. ...

Try to more aggressively narrow masks of extended values.

This is mainly for cases where the mask is trying to zero out any_extended upper bits, assuming we can zext/trunc the values for free.

This catches a few actual missed folds, as well as helps canonicalize a number of other cases which were being caught in isel etc.

Differential Revision: https://reviews.llvm.org/D145866

2023-03-12 13:25:23 +00:00

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