foad added a comment.

> But in practice, the main issue for everyone is the effect on compile time 
> for targets that don't care about convergence/divergence. For such targets, 
> running even the divergence analysis is an unnecessary cost.

LegacyDivergenceAnalysis::runOnFunction bails out immediately if 
!hasBranchDivergence.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D69498/new/

https://reviews.llvm.org/D69498

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