[PATCH] D155940: [SimplifyCFG] Transform for merging the combination of phis in switch

[Hongyu Chen via Phabricator via llvm-commits]

XChy updated this revision to Diff 545192.
XChy added a comment.

- Refactor **TryToSimplifyUncondBranchFromEmptyBlock** to merge phis between BB and Succ with a common predecessor. Logic correctly embedded (OK in Local tests), but not efficient currently.
- A regression found, in **switch-simplify-crash2.ll**. But InstCombine would solve it.
- Testcases not added now, incoming. And ARM/jump-islands-table.ll doesn't test well still.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D155940/new/

https://reviews.llvm.org/D155940

Files:
  llvm/lib/Transforms/Utils/Local.cpp
  llvm/test/CodeGen/ARM/jump-table-islands.ll
  llvm/test/Transforms/SimplifyCFG/merge-phis-in-switch.ll
  llvm/test/Transforms/SimplifyCFG/switch-simplify-crash2.ll

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