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

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

If we want to make things better rather than just not make things worse, we should run an experiment: move the whole bswap / bitreverse matching to aggressive-instcombine without the bitwidth limit.
That may require a pass manager adjustment to run aggressive-instcombine at -O2 to avoid perf regressions, but that could pay for itself by not running these costly matchers so many times when there's really no hope of finding a match.


Repository:
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https://reviews.llvm.org/D90170