--- old/src/hotspot/cpu/x86/stubGenerator_x86_64.cpp	2019-11-21 11:56:42.066505687 +0100
+++ new/src/hotspot/cpu/x86/stubGenerator_x86_64.cpp	2019-11-21 11:56:41.638498455 +0100
@@ -552,7 +552,7 @@
     return start;
   }
 
-  // Support for jint atomic::xchg(jint exchange_value, volatile jint* dest)
+  // Support for jint atomic::xchg(volatile jint* dest, jint exchange_value)
   //
   // Arguments :
   //    c_rarg0: exchange_value
@@ -571,7 +571,7 @@
     return start;
   }
 
-  // Support for intptr_t atomic::xchg_long(jlong exchange_value, volatile jlong* dest)
+  // Support for intptr_t atomic::xchg_long(volatile jlong* dest, jlong exchange_value)
   //
   // Arguments :
   //    c_rarg0: exchange_value