[PATCH] D17442: [LPM] Remove the last worrisome split in the primary loop pass pipeline, allowing LICM and friends to always run over the outer loop after unrolling has a chance to remove the inner loop.

[Michael Zolotukhin via llvm-commits]

mzolotukhin added a comment.

@escha SimplifyCFG is actually pretty complicated pass (it's 5K LOC), so it does a lot of stuff. The problem is that some of the transformations will not preserve LCSSA and might not be located in the current loop, so they can't be applied as-is. In my experiments we were missing, like, almost everything SimplifyCFG does - e.g. the first simplification `ConstFoldTerminator`.


http://reviews.llvm.org/D17442