src/java.base/share/classes/java/lang/Math.java

@@ -1975,10 +1975,11 @@
      * @param d the floating-point value whose signum is to be returned
      * @return the signum function of the argument
      * @author Joseph D. Darcy
      * @since 1.5
      */
+    @HotSpotIntrinsicCandidate
     public static double signum(double d) {
         return (d == 0.0 || Double.isNaN(d))?d:copySign(1.0, d);
     }
 
     /**

@@ -1996,10 +1997,11 @@
      * @param f the floating-point value whose signum is to be returned
      * @return the signum function of the argument
      * @author Joseph D. Darcy
      * @since 1.5
      */
+    @HotSpotIntrinsicCandidate
     public static float signum(float f) {
         return (f == 0.0f || Float.isNaN(f))?f:copySign(1.0f, f);
     }
 
     /**