Simon Pilgrim 812e64ef0c [DAG] MatchRotate - support rotate-by-constant of illegal types ...

Patch to fix some of the regressions in D77804.

By folding to rotate/funnel-shift by constant amounts for illegal types, we prevent SimplifyDemandedBits from destroying the patterns prematurely, allowing us to use the rotate/funnel-shift legalization that was added in D112443.

Differential Revision: https://reviews.llvm.org/D113192

2021-11-19 11:12:04 +00:00

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