src/hotspot/share/opto/machnode.cpp

*** 538,10 ***
--- 538,47 ---
    }
  
    return true;
  }
  
+ //------------------------------is_CAS---------------------------------------
+ // return true if opcode is one of the possible CompareAndSwapX
+ // values otherwise false.
+ bool MachNode::is_CAS(bool maybe_volatile) const {
+   switch(this->ideal_Opcode()) {
+     // We handle these
+     case Op_CompareAndSwapI:
+     case Op_CompareAndSwapL:
+     case Op_CompareAndSwapP:
+     case Op_CompareAndSwapN:
+     case Op_CompareAndSwapB:
+     case Op_CompareAndSwapS:
+     case Op_GetAndSetI:
+     case Op_GetAndSetL:
+     case Op_GetAndSetP:
+     case Op_GetAndSetN:
+     case Op_GetAndAddI:
+     case Op_GetAndAddL:
+       return true;
+     case Op_CompareAndExchangeI:
+     case Op_CompareAndExchangeN:
+     case Op_CompareAndExchangeB:
+     case Op_CompareAndExchangeS:
+     case Op_CompareAndExchangeL:
+     case Op_CompareAndExchangeP:
+     case Op_WeakCompareAndSwapB:
+     case Op_WeakCompareAndSwapS:
+     case Op_WeakCompareAndSwapI:
+     case Op_WeakCompareAndSwapL:
+     case Op_WeakCompareAndSwapP:
+     case Op_WeakCompareAndSwapN:
+       return maybe_volatile;
+     default:
+       return false;
+   }
+ }
+ 
  #ifndef PRODUCT
  //------------------------------dump_spec--------------------------------------
  // Print any per-operand special info
  void MachNode::dump_spec(outputStream *st) const {
    uint cnt = num_opnds();