Index: llvm/lib/Target/AMDGPU/SIFormMemoryClauses.cpp
===================================================================
--- llvm/lib/Target/AMDGPU/SIFormMemoryClauses.cpp
+++ llvm/lib/Target/AMDGPU/SIFormMemoryClauses.cpp
@@ -317,6 +317,8 @@
       MF.getFunction(), "amdgpu-max-memory-clause", MaxClause);
 
   for (MachineBasicBlock &MBB : MF) {
+    GCNDownwardRPTracker RPT(*LIS);
+    bool InitializedInBlock = false;
     MachineBasicBlock::instr_iterator Next;
     for (auto I = MBB.instr_begin(), E = MBB.instr_end(); I != E; I = Next) {
       MachineInstr &MI = *I;
@@ -327,12 +329,21 @@
       if (!isValidClauseInst(MI, IsVMEM))
         continue;
 
-      RegUse Defs, Uses;
-      GCNDownwardRPTracker RPT(*LIS);
-      RPT.reset(MI);
+      if (!InitializedInBlock) {
+        RPT.reset(MI);
+        InitializedInBlock = true;
+      } else {// Advance the state to the current MI.
+        RPT.advance(MachineBasicBlock::const_iterator(MI));
+        RPT.advance();
+      }
 
-      if (!processRegUses(MI, Defs, Uses, RPT))
+      auto LiveRegs = RPT.getLiveRegs();
+      RegUse Defs, Uses;
+      if (!processRegUses(MI, Defs, Uses, RPT)) {
+        // Restore the state before continue.
+        RPT.reset(MI, &LiveRegs);
         continue;
+      }
 
       unsigned Length = 1;
       for ( ; Next != E && Length < FuncMaxClause; ++Next) {
@@ -347,6 +358,10 @@
 
         ++Length;
       }
+
+      // Restore the state after processing the bundle.
+      RPT.reset(MI, &LiveRegs);
+
       if (Length < 2)
         continue;