[all-commits] [llvm/llvm-project] f3eb5d: [LoopPred] Generalize profitability check to handl...

[Philip Reames via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: f3eb5dee5756876be0524c59c21478659eba8c4d
      https://github.com/llvm/llvm-project/commit/f3eb5dee5756876be0524c59c21478659eba8c4d
  Author: Philip Reames <listmail at philipreames.com>
  Date:   2019-11-19 (Tue, 19 Nov 2019)

  Changed paths:
    M llvm/lib/Transforms/Scalar/LoopPredication.cpp
    M llvm/test/Transforms/LoopPredication/predicate-exits.ll

  Log Message:
  -----------
  [LoopPred] Generalize profitability check to handle unswitch output

Unswitch (and other loop transforms) like to generate loop exit blocks with unconditional successors, and phi nodes (LCSSA, or simple multiple exiting blocks sharing an exit).  Generalize the "likely very rare exit" check slightly to handle this form.