Index: include/log4cxx/logger.h
===================================================================
RCS file: /home/cvs/logging-log4cxx/include/log4cxx/logger.h,v
retrieving revision 1.22
diff -u -r1.22 logger.h
--- include/log4cxx/logger.h	13 May 2004 21:14:38 -0000	1.22
+++ include/log4cxx/logger.h	23 Aug 2004 21:03:12 -0000
@@ -542,6 +542,27 @@
 @{
 */
 
+#if !defined(LOG4CXX_UNLIKELY)
+#if __GNUC__ >= 3
+/**
+Provides optimization hint to the compiler 
+to optimize for the expression being false.
+@param expr boolean expression.
+@returns value of expression.
+*/
+#define LOG4CXX_UNLIKELY(expr) __builtin_expect(expr, 0)
+#else
+/**
+Provides optimization hint to the compiler 
+to optimize for the expression being false.
+@param expr boolean expression.
+@returns value of expression.
+**/
+#define LOG4CXX_UNLIKELY(expr) expr
+#endif
+#endif
+
+
 /** 
 Logs a message to a specified logger with a specified level.
 
@@ -562,7 +583,7 @@
 @param message the message string to log.
 */
 #define LOG4CXX_DEBUG(logger, message) { \
-	if (logger->isDebugEnabled()) {\
+	if (LOG4CXX_UNLIKELY(logger->isDebugEnabled())) {\
 	::log4cxx::StringBuffer oss; \
 	oss << message; \
 	logger->forcedLog(::log4cxx::Level::DEBUG, oss.str(), __FILE__, __LINE__); }}