[PATCH] D47735: [DAGCombiner] Create rotates more aggressively

[Krzysztof Parzyszek via Phabricator via llvm-commits]

kparzysz added a comment.

At the moment https://reviews.llvm.org/D49242 expands these intrinsics into individual DAG operations.  If the intrinsics were transformed into ROTL, and if instcombine could reassociate "or" operations to expose more fshl opportunities, then I guess it would be sufficient.

A benefit of having it in the DAG combiner is that it could handle IR generators that have not generated funnel shifts.


Repository:
  rL LLVM

https://reviews.llvm.org/D47735