diff --git a/pvAccessApp/utils/likely.h b/pvAccessApp/utils/likely.h
new file mode 100644
index 0000000..7112be4
--- /dev/null
+++ b/pvAccessApp/utils/likely.h
@@ -0,0 +1,18 @@
+/**
+ * Copyright - See the COPYRIGHT that is included with this distribution.
+ * pvAccessCPP is distributed subject to a Software License Agreement found
+ * in file LICENSE that is included with this distribution.
+ */
+
+#ifndef LIKELY_H_
+#define LIKELY_H_
+
+#if defined(__GNUC__) 
+	#define likely(x) __builtin_expect (x, 1)
+	#define unlikely(x) __builtin_expect (x, 0)
+#else
+	#define likely(x) (x)
+	#define unlikely(x) (x)
+#endif
+
+#endif /* LIKELY_H_ */