Alina Sbirlea 5666c7e4bd [SimpleLoopUnswitch] Fix DT updates for trivial branch unswitching. ...

Summary:
Fixing 2 issues with the DT update in trivial branch switching, though I don't have a case where DT update fails.
1. After splitting ParentBB->UnswitchedBB edge, new edges become: ParentBB->LoopExitBB->UnswitchedBB, so remove ParentBB->LoopExitBB edge.
2. AFAIU, for multiple CFG changes, DT should be updated using batch updates, vs consecutive addEdge and removeEdge calls.

Reviewers: chandlerc, kuhar

Subscribers: sanjoy, jlebar, llvm-commits

Differential Revision: https://reviews.llvm.org/D49925

llvm-svn: 338180

2018-07-28 00:01:05 +00:00

106 KiB

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