[PATCH] D35411: [SimplifyCFG] Defer folding unconditional branches to LateSimplifyCFG if it can destroy canonical loop structure.

[Balaram Makam via Phabricator via llvm-commits]

bmakam added a comment.

In https://reviews.llvm.org/D35411#813349, @efriedma wrote:

> SwitchToLookupTable is itself part of LateSimplifyCFG; we should fold empty blocks afterwards, I think?


I was expecting the same but found that LateSimplifyCFG could not catch empty case blocks in spec2017/perlbench. Perhaps later transformations like unreachableblockelim or constanthoist could turn some cases into empty blocks?


https://reviews.llvm.org/D35411