Chijun Sima 00712cb749 [DomTreeUpdater] Ignore updates when both DT and PDT are nullptrs ... Summary: Previously, when both DT and PDT are nullptrs and the UpdateStrategy is Lazy, DomTreeUpdater still pends updates inside. After this patch, DomTreeUpdater will ignore all updates from(`applyUpdates()/insertEdge*()/deleteEdge*()`) in this case. (call `delBB()` still pends BasicBlock deletion until a flush event according to the doc). The behavior of DomTreeUpdater previously documented won't change after the patch. Reviewers: dmgreen, davide, kuhar, brzycki, grosser Reviewed By: kuhar Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D48974 llvm-svn: 336968		2018-07-13 04:02:13 +00:00
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llvm	[DomTreeUpdater] Ignore updates when both DT and PDT are nullptrs	2018-07-13 04:02:13 +00:00
llvm-c	[UnrollAndJam] New Unroll and Jam pass	2018-07-01 12:47:30 +00:00