[PATCH] D28767: Do not verify Dominator tree if it has no roots
Chad Rosier via Phabricator via llvm-commits
llvm-commits at lists.llvm.org
Mon Jan 16 11:04:32 PST 2017
mcrosier added a comment.
This seems reasonable to me, but I've added more reviews to see if they have any additional feedback.
IIRC, when I wrote the patch to add the verifyDomTree function here it was taken verbatim from the IR level dominator tree verifier. Therefore, it might be a good idea to make a similar change to the IR-level verifier.
Comment at: lib/CodeGen/MachineDominators.cpp:147
+ if (getRoots().empty())
+ // If no roots found in the dominator tree, the pass that builds it is
+ // likely to be skipped.
I'd probably drop this comment in favor of the title of this revision, "Do not verify Dominator tree if it has no root."
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