[llvm] unpack packed instructions overlapped by MFMAs post-RA scheduling (PR #157968)

[Jan Patrick Lehr via llvm-commits]

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@@ -39,6 +48,37 @@ class SIPreEmitPeephole {
                              const MachineBasicBlock &From,
                              const MachineBasicBlock &To) const;
   bool removeExeczBranch(MachineInstr &MI, MachineBasicBlock &SrcMBB);
+  // Check if the machine instruction being processed is a supported packed
+  // instruction
+  bool isUnpackingSupportedInstr(MachineInstr &MI) const;
+  // Creates a list of packed instructions following an MFMA that are suitable
+  // for unpacking.
+  void createListOfPackedInstr(MachineInstr &BeginMI,
+                               SetVector<MachineInstr *> &InstrsToUnpack,
+                               uint16_t NumMFMACycles);
+  // Identify register dependencies between those used by the MFMA
+  // instruction and the following packed instructions. Conservatively ensures
+  // that we do not incorrectly read/write registers.
+  bool hasReadWriteDependencies(const MachineInstr &PredMI,
+                                const MachineInstr &SuccMI);
+  // Unpack F32 packed instructions, such as V_PK_MUL, V_PK_ADD, and V_PK_FMA.
+  // Currently, only V_PK_MUL, V_PK_ADD, V_PK_FMA are supported for this
+  // transformation.
+  void processF32Unpacking(MachineInstr &I);
+  // Insert appropriate unpacked instructions into the BB
+  void insertUnpackedF32MI(MachineInstr &I, bool IsFMA);
+  // Select corresponding unpacked instruction from packed instruction as input
+  uint16_t mapToUnpackedOpcode(MachineInstr &I);
+  // Creates the unpacked instruction to be inserted. Adds source modifiers to
+  // the unpacked instructions based on the source modifiers in the packed
+  // instruction
+  MachineInstrBuilder createUnpackedMI(MachineBasicBlock &MBB, MachineInstr &I,
+                                       const DebugLoc &DL,
+                                       uint16_t UnpackedOpcode, bool IsHiBits,
+                                       bool IsFMA);
+  void addOperandandMods(MachineInstrBuilder NewMI, unsigned Src_Mods,
----------------
jplehr wrote:

```suggestion
  void addOperandAndMods(MachineInstrBuilder NewMI, unsigned Src_Mods,
```
Is this worth adding  comment too?

https://github.com/llvm/llvm-project/pull/157968