--- old/src/hotspot/share/runtime/globals.hpp	2020-08-18 21:34:37.170751208 +0300
+++ new/src/hotspot/share/runtime/globals.hpp	2020-08-18 21:34:36.966773356 +0300
@@ -350,6 +350,9 @@
   diagnostic(bool, UseVectorizedMismatchIntrinsic, false,                   \
           "Enables intrinsification of ArraysSupport.vectorizedMismatch()") \
                                                                             \
+  diagnostic(bool, UseSignumIntrinsic, false,                               \
+          "Enables intrinsification of Math.signum")                        \
+                                                                            \
   diagnostic(ccstrlist, DisableIntrinsic, "",                               \
          "do not expand intrinsics whose (internal) names appear here")     \
                                                                             \