[all-commits] [llvm/llvm-project] 778138: [SDAG] Use BatchAAResults for querying alias analy...

[Benjamin Maxwell via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 778138114e9e42e28fcb51c0a38224e667a3790c
      https://github.com/llvm/llvm-project/commit/778138114e9e42e28fcb51c0a38224e667a3790c
  Author: Benjamin Maxwell <benjamin.maxwell at arm.com>
  Date:   2025-01-23 (Thu, 23 Jan 2025)

  Changed paths:
    M llvm/include/llvm/Analysis/AliasAnalysis.h
    M llvm/include/llvm/CodeGen/MachineInstr.h
    M llvm/include/llvm/CodeGen/ScheduleDAGInstrs.h
    M llvm/include/llvm/CodeGen/SelectionDAG.h
    M llvm/include/llvm/CodeGen/SelectionDAGISel.h
    M llvm/lib/CodeGen/MachineInstr.cpp
    M llvm/lib/CodeGen/ScheduleDAGInstrs.cpp
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/lib/CodeGen/SelectionDAG/ScheduleDAGFast.cpp
    M llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
    M llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.cpp
    M llvm/lib/CodeGen/SelectionDAG/ScheduleDAGSDNodes.h
    M llvm/lib/CodeGen/SelectionDAG/ScheduleDAGVLIW.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h
    M llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
    M llvm/lib/Target/SystemZ/SystemZISelDAGToDAG.cpp

  Log Message:
  -----------
  [SDAG] Use BatchAAResults for querying alias analysis (AA) results (#123934)

Once we get to SelectionDAG the IR should not be changing anymore, so we
can use BatchAAResults rather than AAResults to cache AA queries.

This should be a NFC change for targets that enable AA during codegen
(such as AArch64), but also give a nice compile-time improvement in some
cases. See:
https://github.com/llvm/llvm-project/pull/123787#issuecomment-2606797041

Note: This follows Nikita's suggestion on #123787.



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