diff --git a/llvm/include/llvm/CodeGen/MachineScheduler.h b/llvm/include/llvm/CodeGen/MachineScheduler.h
--- a/llvm/include/llvm/CodeGen/MachineScheduler.h
+++ b/llvm/include/llvm/CodeGen/MachineScheduler.h
@@ -757,8 +757,16 @@
 
   unsigned getOtherResourceCount(unsigned &OtherCritIdx);
 
-  template <bool InPQueue>
-  void releaseNode(SUnit *SU, unsigned ReadyCycle, unsigned Idx = 0);
+  /// Release SU to make it ready. If it's not in hazard, remove it from
+  /// pending queue (if already in) and push into available queue.
+  /// Otherwise, push the SU into pending queue.
+  ///
+  /// @param SU The unit to be released.
+  /// @param ReadyCycle Until which cycle the unit is ready.
+  /// @param InPQueue Whether SU is already in pending queue.
+  /// @param Idx Position offset in pending queue (if in it).
+  void releaseNode(SUnit *SU, unsigned ReadyCycle, bool InPQueue,
+                   unsigned Idx = 0);
 
   void bumpCycle(unsigned NextCycle);
 
@@ -956,7 +964,7 @@
     if (SU->isScheduled)
       return;
 
-    Top.releaseNode<false>(SU, SU->TopReadyCycle);
+    Top.releaseNode(SU, SU->TopReadyCycle, false);
     TopCand.SU = nullptr;
   }
 
@@ -964,7 +972,7 @@
     if (SU->isScheduled)
       return;
 
-    Bot.releaseNode<false>(SU, SU->BotReadyCycle);
+    Bot.releaseNode(SU, SU->BotReadyCycle, false);
     BotCand.SU = nullptr;
   }
 
@@ -1044,7 +1052,7 @@
   void releaseTopNode(SUnit *SU) override {
     if (SU->isScheduled)
       return;
-    Top.releaseNode<false>(SU, SU->TopReadyCycle);
+    Top.releaseNode(SU, SU->TopReadyCycle, false);
   }
 
   // Only called for roots.
diff --git a/llvm/lib/CodeGen/MachineScheduler.cpp b/llvm/lib/CodeGen/MachineScheduler.cpp
--- a/llvm/lib/CodeGen/MachineScheduler.cpp
+++ b/llvm/lib/CodeGen/MachineScheduler.cpp
@@ -2088,13 +2088,8 @@
   return OtherCritCount;
 }
 
-template void SchedBoundary::releaseNode<true>(SUnit *SU, unsigned ReadyCycle,
-                                               unsigned Idx);
-template void SchedBoundary::releaseNode<false>(SUnit *SU, unsigned ReadyCycle,
-                                                unsigned Idx);
-
-template <bool InPQueue>
-void SchedBoundary::releaseNode(SUnit *SU, unsigned ReadyCycle, unsigned Idx) {
+void SchedBoundary::releaseNode(SUnit *SU, unsigned ReadyCycle, bool InPQueue,
+                                unsigned Idx) {
   assert(SU->getInstr() && "Scheduled SUnit must have instr");
 
 #ifndef NDEBUG
@@ -2373,7 +2368,7 @@
     if (Available.size() >= ReadyListLimit)
       break;
 
-    releaseNode<true>(SU, ReadyCycle, I);
+    releaseNode(SU, ReadyCycle, true, I);
     if (E != Pending.size()) {
       --I;
       --E;