[PATCH] D90170: [InstCombine] InstCombinerImpl::visitOr - enable bitreverse matching

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

In D90170#2759050 <https://reviews.llvm.org/D90170#2759050>, @lebedev.ri wrote:

> LGTM, but from the llvm-xray traces of LLVM i've seen, IIRC matchBSwapOrBitReverse/collectbitparts is pretty high up in the list of cycle eaters.

OK, I'm going to reduce the traversal tree depth in a separate patch first to make any nasty build time regressions due to the bitreverse matching more specific.


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https://reviews.llvm.org/D90170