[PATCH] D113291: [AggressiveInstCombine] Lower Table Based CTTZ and enable it for AARCH64 in -O3

[Eli Friedman via Phabricator via llvm-commits]

efriedma added a comment.

Concretely, my preferred solution looks something like:

1. Perform the transform unconditionally in AggressiveInstCombine (so this patch without the preferCTTZLowering() bits).
2. Teach TargetLowering::expandCTTZ to emit a table lookup.


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  https://reviews.llvm.org/D113291/new/

https://reviews.llvm.org/D113291