[PATCH] D22696: [CodeGenPrep] Skip merging empty case blocks

[David Li via llvm-commits]

davidxl added a comment.

I tried dehao's patch on the original test case -- unfortunately it does not work. The reason is that MachineSink pass fails to split the critical edge because the indirect branch (from switch lowering) in the source BB prevents the edge from being split because it is not analyzable. See MachineBasicBlock::canSplitCriticalEdge


https://reviews.llvm.org/D22696