[PATCH] D56449: [UnrollRuntime] Support multi-exiting blocks to LatchExit

[Anna Thomas via Phabricator via llvm-commits]

anna created this revision.
anna added reviewers: reames, dmgreen, mkazantsev, mzolotukhin.
Herald added a subscriber: zzheng.

This patch implements runtime unrolling for multi-exit loops where
there are multiple exiting blocks that go to the latchExit.
This requires updating the ConnectProlog and ConnectEpilog code.

For this patch, the implementation is only for remainder code which is
prolog code. Added test cases for various scenarios.
No DT or LI changes required.


Repository:
  rL LLVM

https://reviews.llvm.org/D56449

Files:
  lib/Transforms/Utils/LoopUnrollRuntime.cpp
  test/Transforms/LoopUnroll/runtime-loop-multiple-exits.ll

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