src/share/vm/opto/memnode.hpp

rev 10065 : 8147844: new method j.l.Runtime.onSpinWait() and the corresponding x86 hotspot instrinsic
Summary: adds c1 & c2 x86 intrinsics for j.l.Runtime.onSpinWait() that utilize the 'pause' instruction
Contributed-by: ikrylov, ygaevsky
Reviewed-by: iveresov, vlivanov, kvn

@@ -1084,10 +1084,17 @@
     : MemBarNode(C, alias_idx, precedent) {}
   virtual int Opcode() const;
   virtual uint ideal_reg() const { return 0; } // not matched in the AD file
 };
 
+class OnSpinWaitNode: public MemBarNode {
+public:
+  OnSpinWaitNode(Compile* C, int alias_idx, Node* precedent)
+    : MemBarNode(C, alias_idx, precedent) {}
+  virtual int Opcode() const;
+};
+
 // Isolation of object setup after an AllocateNode and before next safepoint.
 // (See comment in memnode.cpp near InitializeNode::InitializeNode for semantics.)
 class InitializeNode: public MemBarNode {
   friend class AllocateNode;