[llvm] [AArch64][SME] Refactor MachineSMEABI pass state (NFCI) (PR #156674)

[Gaëtan Bossu via llvm-commits]

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@@ -260,55 +322,27 @@ struct MachineSMEABI : public MachineFunctionPass {
   void restorePhyRegSave(PhysRegSave const &RegSave, MachineBasicBlock &MBB,
                          MachineBasicBlock::iterator MBBI, DebugLoc DL);
 
-  /// Get or create a TPIDR2 block in this function.
-  TPIDR2State getTPIDR2Block();
-
-  Register getAgnosticZABufferPtr();
-
 private:
-  /// Contains the needed ZA state (and live registers) at an instruction.
-  struct InstInfo {
-    ZAState NeededState{ZAState::ANY};
-    MachineBasicBlock::iterator InsertPt;
-    LiveRegs PhysLiveRegs = LiveRegs::None;
-  };
-
-  /// Contains the needed ZA state for each instruction in a block.
-  /// Instructions that do not require a ZA state are not recorded.
-  struct BlockInfo {
-    ZAState FixedEntryState{ZAState::ANY};
-    SmallVector<InstInfo> Insts;
-    LiveRegs PhysLiveRegsAtEntry = LiveRegs::None;
-    LiveRegs PhysLiveRegsAtExit = LiveRegs::None;
-  };
-
-  // All pass state that must be cleared between functions.
-  struct PassState {
-    SmallVector<BlockInfo> Blocks;
-    SmallVector<ZAState> BundleStates;
-    std::optional<TPIDR2State> TPIDR2Block;
-    std::optional<MachineBasicBlock::iterator> AfterSMEProloguePt;
-    Register AgnosticZABufferPtr = AArch64::NoRegister;
-    LiveRegs PhysLiveRegsAfterSMEPrologue = LiveRegs::None;
-  } State;
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gbossu wrote:

🚀 

https://github.com/llvm/llvm-project/pull/156674