[PATCH] D77804: [DAG] Enable ISD::SHL/SRL SimplifyMultipleUseDemandedBits handling (WIP)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In D77804#3073304 <https://reviews.llvm.org/D77804#3073304>, @craig.topper wrote:

> @RKSimon are the other problems with this patch than just the GORCI matching?

The GORCI matching is the main one.

There is also some minor issues with MatchRotate - we should be allowed to match rotate/funnel by constant pre-legalization (see ARM/ror.ll) as that can be re-expanded later without any harm done, before we see through the pattern and lose it, although now that we match this quite well in InstCombine I'm not sure is this is as likely to happen.


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