[all-commits] [llvm/llvm-project] f756f0: [SimpleLoopUnswitch] Skip non-trivial unswitching ...

[Ruobing Han via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f756f06cc471b91d81d7f7f15d9df76ed24de730
      https://github.com/llvm/llvm-project/commit/f756f06cc471b91d81d7f7f15d9df76ed24de730
  Author: Ruobing Han <hanruobing at gatech.edu>
  Date:   2022-08-08 (Mon, 08 Aug 2022)

  Changed paths:
    M llvm/lib/Passes/PassBuilder.cpp
    M llvm/lib/Transforms/Scalar/SimpleLoopUnswitch.cpp
    M llvm/test/Other/new-pm-defaults.ll
    M llvm/test/Other/new-pm-thinlto-defaults.ll
    M llvm/test/Other/new-pm-thinlto-postlink-pgo-defaults.ll
    M llvm/test/Other/new-pm-thinlto-postlink-samplepgo-defaults.ll
    M llvm/test/Other/new-pm-thinlto-prelink-pgo-defaults.ll
    M llvm/test/Other/new-pm-thinlto-prelink-samplepgo-defaults.ll
    M llvm/test/Transforms/LoopPredication/preserve-bpi.ll
    M llvm/test/Transforms/SimpleLoopUnswitch/PGO-nontrivial-unswitch.ll
    M llvm/test/Transforms/SimpleLoopUnswitch/nontrivial-unswitch-markloopasdeleted.ll

  Log Message:
  -----------
  [SimpleLoopUnswitch] Skip non-trivial unswitching of cold loops

With profile data, non-trivial LoopUnswitch will only apply on non-cold loops, as unswitching cold loops may not gain much benefit but significantly increase the code size.

Reviewed By: aeubanks, asbirlea

Differential Revision: https://reviews.llvm.org/D129599