[all-commits] [llvm/llvm-project] 12dd3a: Recommit "[LoopUnroll] Directly update DT instead ...

[Florian Hahn via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 12dd3a7b54cd19524fc29edba374d26972246744
      https://github.com/llvm/llvm-project/commit/12dd3a7b54cd19524fc29edba374d26972246744
  Author: Florian Hahn <flo at fhahn.com>
  Date:   2023-01-20 (Fri, 20 Jan 2023)

  Changed paths:
    M llvm/include/llvm/Transforms/Utils/BasicBlockUtils.h
    M llvm/lib/Transforms/Utils/BasicBlockUtils.cpp
    M llvm/lib/Transforms/Utils/LoopUnroll.cpp

  Log Message:
  -----------
  Recommit "[LoopUnroll] Directly update DT instead of DTU."

This reverts commit c5ea42bcf48c8f3d3e35a6bff620b06d2a499108.

Recommit the patch with a fix for loops where the exiting terminator is
not a branch instruction. In that case, ExitInfos may be empty. In
addition to checking if there's a single exiting block also check if
there's a single ExitInfo.

A test case has been added in f92b35392ed8e4631.