[PATCH] D86578: [TargetLowering] Combine known bits for icmp in SimplifySetCC (PR41182)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In D86578#3264329 <https://reviews.llvm.org/D86578#3264329>, @nikic wrote:

> To repeat my previous question, because it's not obvious from tests: Which legalizations does this improve? That is, for input IR that has already gone through the `opt -O2` pipeline, which cases does this improve?

Its quite a long time ago when I first encountered this but IIRC one of the places I hit this was in the sdiv/udiv by constant expansions


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