[all-commits] [llvm/llvm-project] 434630: [MachinePipeliner] Remove cheap check in dependenc...

[Ryotaro Kasuga via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 434630333e52ce2a12248fee47f8a727632ce5d5
      https://github.com/llvm/llvm-project/commit/434630333e52ce2a12248fee47f8a727632ce5d5
  Author: Ryotaro Kasuga <kasuga.ryotaro at fujitsu.com>
  Date:   2026-01-15 (Thu, 15 Jan 2026)

  Changed paths:
    M llvm/lib/CodeGen/MachinePipeliner.cpp
    M llvm/test/CodeGen/Hexagon/swp-carried-dep1.mir
    M llvm/test/CodeGen/Hexagon/swp-carried-dep2.mir

  Log Message:
  -----------
  [MachinePipeliner] Remove cheap check in dependence analysis (#174390)

In loop-carried dependence analysis of MachinePipeliner, there is
special handling for a specific case, referred to as a "cheap check".
This check is not sound and sometimes misses dependencies. If there is
no significant performance regression, this special logic should be
deleted.

Split off from https://github.com/llvm/llvm-project/pull/135148



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