[PATCH] D32353: [LoopSimplify] Simplify constant conditional branches to unconditional branches

[Anna Thomas via Phabricator via llvm-commits]

anna created this revision.
Herald added a subscriber: mzolotukhin.

This is an enhancement to add support to loop-simplify to change constant
conditional branches (eg: `br i1 true, label https://reviews.llvm.org/L1, label L2) to unconditional 
branches (br label https://reviews.llvm.org/L1).
This will remove blocks from the
loop in the process. We avoid cases where a loop is completely removed.

Added test cases shows various use cases for the transformation. The benefit
would be for these branches that are created after loop-unswitching, can be
cleaned up using loop-simplifycfg.


https://reviews.llvm.org/D32353

Files:
  lib/Analysis/LoopInfo.cpp
  lib/Transforms/Scalar/LoopSimplifyCFG.cpp

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