[PATCH] D36504: [CodeGenPrepare][WIP] Convert uncond. branch to return into a return to help with shrink-wrapping

[Sean Fertile via Phabricator via llvm-commits]

sfertile added a comment.

In https://reviews.llvm.org/D36504#909077, @kparzysz wrote:

> Isn't tail duplication a better place to do this?


So I attempted this in the PreRA tail-duplication pass. Unfortunately by the time we get there the opportunity is gone.  If we do not duplicate the return then CodegenPrepare will end up deleting  the `for.cond.cleanup.loopexit` block and we loose the shrink wrapping opportunity.


Repository:
  rL LLVM

https://reviews.llvm.org/D36504