================
@@ -57,6 +57,226 @@ void 
RegBankLegalizeHelper::findRuleAndApplyMapping(MachineInstr &MI) {
   lower(MI, Mapping, WaterfallSgprs);
 }
 
+bool RegBankLegalizeHelper::executeInWaterfallLoop(
+    MachineIRBuilder &B, iterator_range<MachineBasicBlock::iterator> Range,
+    SmallSet<Register, 4> &SGPROperandRegs) {
+  // Track use registers which have already been expanded with a readfirstlane
+  // sequence. This may have multiple uses if moving a sequence.
+  DenseMap<Register, Register> WaterfalledRegMap;
+
+  MachineBasicBlock &MBB = B.getMBB();
+  MachineFunction &MF = B.getMF();
+
+  const SIRegisterInfo *TRI = ST.getRegisterInfo();
+  const TargetRegisterClass *WaveRC = TRI->getWaveMaskRegClass();
+  unsigned MovExecOpc, MovExecTermOpc, XorTermOpc, AndSaveExecOpc, ExecReg;
+  if (ST.isWave32()) {
----------------
Pierre-vh wrote:

nit: I think those could go in the class directly so this isn't repeated 
everytime no ?
The class is instantiated per function anyway

https://github.com/llvm/llvm-project/pull/142790
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