[PATCH] D81981: [PGO] Supplement PGO profile with Sample profile

[Wenlei He via Phabricator via llvm-commits]

wenlei added a comment.

If how we select BB to instrument depends on a switch, we would need instrumentation build and optimizing build to have consistent switch, otherwise counters could mismatch even if CFG checksum matches? I guess that's one reason why it'd be good to avoid different ways of selecting BBs.

Would it be possible to tweak/cheat the edge weights just for MST so entry BB is pinned to be non-MST node hence guaranteed to be instrumented directly?


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https://reviews.llvm.org/D81981