[all-commits] [llvm/llvm-project] ef60ee: [MachinePipeliner] Introduce a new class for loop-...

[Ryotaro Kasuga via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ef60ee6005b36fd38afe2d21fa88436a59fd58d6
      https://github.com/llvm/llvm-project/commit/ef60ee6005b36fd38afe2d21fa88436a59fd58d6
  Author: Ryotaro Kasuga <kasuga.ryotaro at fujitsu.com>
  Date:   2025-06-05 (Thu, 05 Jun 2025)

  Changed paths:
    M llvm/include/llvm/CodeGen/MachinePipeliner.h
    M llvm/lib/CodeGen/MachinePipeliner.cpp
    A llvm/test/CodeGen/AArch64/sms-loop-carried-fp-exceptions1.mir
    A llvm/test/CodeGen/AArch64/sms-loop-carried-fp-exceptions2.mir
    A llvm/test/CodeGen/Hexagon/swp-loop-carried-order-dep1.mir
    A llvm/test/CodeGen/Hexagon/swp-loop-carried-order-dep2.mir
    A llvm/test/CodeGen/Hexagon/swp-loop-carried-order-dep3.mir
    A llvm/test/CodeGen/Hexagon/swp-loop-carried-order-dep4.mir
    A llvm/test/CodeGen/Hexagon/swp-loop-carried-order-dep5.mir
    A llvm/test/CodeGen/Hexagon/swp-loop-carried-order-dep6.mir

  Log Message:
  -----------
  [MachinePipeliner] Introduce a new class for loop-carried deps (#137663)

In MachinePipeliner, loop-carried memory dependencies are represented by
DAG, which makes things complicated and causes some necessary
dependencies to be missing. This patch introduces a new class to manage
loop-carried memory dependencies to simplify the logic. The ultimate
goal is to add currently missing dependencies, but this is a first step
of that, and this patch doesn't intend to change current behavior. This
patch also adds new tests that show the missed dependencies, which
should be fixed in the future.

Split off from #135148



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