8281168: Micro-optimize VarForm.getMemberName for interpreter

Reviewed-by: redestad, vlivanov, mchung
openjdk · Feb 9, 2022 · fc77217 · fc77217 · openjdk-notifier · Feb 9, 2022
1 parent bce5dd1
commit fc77217
Showing 1 changed file with 7 additions and 2 deletions.
diff --git a/src/java.base/share/classes/java/lang/invoke/VarForm.java b/src/java.base/share/classes/java/lang/invoke/VarForm.java
@@ -109,9 +109,14 @@ final MethodType getMethodType(int type) {
 
     @ForceInline
     final MemberName getMemberName(int mode) {
-        MemberName mn = getMemberNameOrNull(mode);
+        // Can be simplified by calling getMemberNameOrNull, but written in this
+        // form to improve interpreter/coldpath performance.
+        MemberName mn = memberName_table[mode];
         if (mn == null) {
-            throw new UnsupportedOperationException();
+            mn = resolveMemberName(mode);
+            if (mn == null) {
+                throw new UnsupportedOperationException();
+            }
         }
         return mn;
     }