[all-commits] [llvm/llvm-project] c4484e: [CodeGen] De-type getMinimalPhysRegClass and relat...

[Cullen Rhodes via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c4484e8422745ab8c1ada25a6bda5d69ef8da924
      https://github.com/llvm/llvm-project/commit/c4484e8422745ab8c1ada25a6bda5d69ef8da924
  Author: Cullen Rhodes <cullen.rhodes at arm.com>
  Date:   2026-06-02 (Tue, 02 Jun 2026)

  Changed paths:
    M llvm/docs/ReleaseNotes.md
    M llvm/include/llvm/CodeGen/TargetRegisterInfo.h
    M llvm/lib/CodeGen/AggressiveAntiDepBreaker.cpp
    M llvm/lib/CodeGen/MachineVerifier.cpp
    M llvm/lib/CodeGen/RegisterBankInfo.cpp
    M llvm/lib/CodeGen/SelectionDAG/InstrEmitter.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/TargetRegisterInfo.cpp
    M llvm/lib/Target/AMDGPU/SILowerSGPRSpills.cpp
    M llvm/unittests/CodeGen/MFCommon.inc
    M llvm/utils/TableGen/RegisterInfoEmitter.cpp

  Log Message:
  -----------
  [CodeGen] De-type getMinimalPhysRegClass and related APIs (#197495)

Follow-up #193438 to de-type getMinimalPhysRegClass so it can be replaced with
the precomputed getDefaultMinimalPhysRegClass. Type is also removed from
related APIs.

There's very few uses of getMinimalPhysRegClass with a non-default type
(MVT::Other) and none at all for getCommonMinimalPhysRegClass. Rather than
trying to also handle the type when precomputing at compile-time it seems
better to remove the type altogether and simplify the APIs. This also improves
compile-time for a number of targets and configurations:

CTMark geomean:
- stage1-O3: -0.23%
- stage1-ReleaseThinLTO: -0.19%
- stage1-ReleaseLTO-g: -0.15%
- stage1-aarch64-O3: -0.57%
- stage2-O3: -0.23%
- clang: -0.13%

https://llvm-compile-time-tracker.com/compare.php?from=eae0b6b2498305ee29dc85a405ede9ccdc10ce7d&to=08c052a2db407d2a21d468001fd2035d3720acf7&stat=instructions%3Au

Assisted-by: codex



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