[all-commits] [llvm/llvm-project] ff68e4: [MachineLICM] Handle Subloops

[JinGu Kang via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ff68e43c811e4dfcff7f5a4492e3c5e46248aee6
      https://github.com/llvm/llvm-project/commit/ff68e43c811e4dfcff7f5a4492e3c5e46248aee6
  Author: Jingu Kang <jingu.kang at arm.com>
  Date:   2023-09-26 (Tue, 26 Sep 2023)

  Changed paths:
    M llvm/lib/CodeGen/MachineLICM.cpp
    M llvm/test/CodeGen/AArch64/machine-licm-sub-loop.ll
    M llvm/test/CodeGen/AMDGPU/agpr-copy-no-free-registers.ll
    M llvm/test/CodeGen/AMDGPU/exec-mask-opt-cannot-create-empty-or-backward-segment.ll
    M llvm/test/CodeGen/AMDGPU/optimize-negated-cond.ll
    M llvm/test/CodeGen/AMDGPU/tuple-allocation-failure.ll
    M llvm/test/CodeGen/Thumb2/mve-gather-scatter-optimisation.ll
    M llvm/test/CodeGen/WebAssembly/reg-stackify.ll

  Log Message:
  -----------
  [MachineLICM] Handle Subloops

It is a re-commit from reverted commit 3454cf67bd0a650097dc6ca99874a34e1d59b500.

Following discussion on https://reviews.llvm.org/D154205, make MachineLICM pass
handle subloops with only visiting outermost loop's blocks once.

Differential Revision: https://reviews.llvm.org/D154205