[PATCH] D107766: [AggressiveInstCombine] Add `lshr` and `ashr` instructions to TruncInstCombine DAG

[Anton Afanasyev via Phabricator via llvm-commits]

anton-afanasyev added a comment.

>> Hmm, how could we compute knownbits of the shift amount at compile time? Do you mean analyzing DAG for the shift amount Value, taking knowbits recursively?
>
> You've seen `llvm::computeKnownBits()`, right?

Thanks, used it.


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