[all-commits] [llvm/llvm-project] 751be2: [CodeMoverUtils] Enhance isSafeToMoveBefore() when...

[CongzheUalberta via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 751be2a064f119af74c7b9b1e52bc904d8aa114d
      https://github.com/llvm/llvm-project/commit/751be2a064f119af74c7b9b1e52bc904d8aa114d
  Author: Congzhe Cao <congzhe.cao at huawei.com>
  Date:   2021-09-24 (Fri, 24 Sep 2021)

  Changed paths:
    M llvm/include/llvm/Transforms/Utils/CodeMoverUtils.h
    M llvm/lib/Transforms/Utils/CodeMoverUtils.cpp
    M llvm/unittests/Transforms/Utils/CodeMoverUtilsTest.cpp

  Log Message:
  -----------
  [CodeMoverUtils] Enhance isSafeToMoveBefore() when moving BBs

When moving an entire basic block BB before InsertPoint, currently
we check for all instructions whether the operands dominates
InsertPoint, however, this can be improved such that even an
operand does not dominate InsertPoint, as long as it appears as
a previous instruction in the same BB, it is safe to move.

Reviewed By: Whitney

Differential Revision: https://reviews.llvm.org/D110378