[all-commits] [llvm/llvm-project] 3dcaf2: [Loop Peeling] Add possibility to enable peeling o...

[Arkady Shlykov via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: 3dcaf296aeb0d06bcb8f6e7fb661573d6e01d90c
      https://github.com/llvm/llvm-project/commit/3dcaf296aeb0d06bcb8f6e7fb661573d6e01d90c
  Author: Arkady Shlykov <arkady.shlykov at intel.com>
  Date:   2020-03-02 (Mon, 02 Mar 2020)

  Changed paths:
    M llvm/include/llvm/Analysis/TargetTransformInfo.h
    M llvm/include/llvm/Transforms/Utils/LoopUtils.h
    M llvm/lib/Transforms/Scalar/LoopUnrollPass.cpp
    M llvm/lib/Transforms/Scalar/LoopUnswitch.cpp
    M llvm/lib/Transforms/Utils/LoopUnrollPeel.cpp
    M llvm/lib/Transforms/Utils/LoopUtils.cpp
    M llvm/test/Transforms/LoopUnroll/peel-loop-conditions.ll
    A llvm/test/Transforms/LoopUnroll/peel-loop-nests.ll

  Log Message:
  -----------
  [Loop Peeling] Add possibility to enable peeling on loop nests.

Summary:
Current peeling implementation bails out in case of loop nests.
The patch introduces a field in TargetTransformInfo structure that
certain targets can use to relax the constraints if it's
profitable (disabled by default).
Also additional option is added to enable peeling manually for
experimenting and testing purposes.

Reviewers: fhahn, lebedev.ri, xbolva00

Reviewed By: xbolva00

Subscribers: RKSimon, xbolva00, hiraditya, zzheng, llvm-commits

Differential Revision: https://reviews.llvm.org/D70304