--- old/src/hotspot/share/opto/library_call.cpp	2018-12-06 23:03:24.874120381 -0600
+++ new/src/hotspot/share/opto/library_call.cpp	2018-12-06 23:03:24.264140511 -0600
@@ -324,6 +324,7 @@
   bool inline_montgomerySquare();
   bool inline_vectorizedMismatch();
   bool inline_fma(vmIntrinsics::ID id);
+  bool inline_character_compare(vmIntrinsics::ID id);
 
   bool inline_profileBoolean();
   bool inline_isCompileConstant();
@@ -867,6 +868,12 @@
   case vmIntrinsics::_fmaF:
     return inline_fma(intrinsic_id());
 
+  case vmIntrinsics::_isDigit:
+  case vmIntrinsics::_isLowerCase:
+  case vmIntrinsics::_isUpperCase:
+  case vmIntrinsics::_isWhitespace:
+    return inline_character_compare(intrinsic_id());
+
   default:
     // If you get here, it may be that someone has added a new intrinsic
     // to the list in vmSymbols.hpp without implementing it here.
@@ -6555,6 +6562,32 @@
   return true;
 }
 
+bool LibraryCallKit::inline_character_compare(vmIntrinsics::ID id) {
+  // argument(0) is receiver
+  Node* codePoint = argument(1);
+  Node* n = NULL;
+
+  switch (id) {
+    case vmIntrinsics::_isDigit :
+      n = new DigitNode(control(), codePoint);
+      break;
+    case vmIntrinsics::_isLowerCase :
+      n = new LowerCaseNode(control(), codePoint);
+      break;
+    case vmIntrinsics::_isUpperCase :
+      n = new UpperCaseNode(control(), codePoint);
+      break;
+    case vmIntrinsics::_isWhitespace :
+      n = new WhitespaceNode(control(), codePoint);
+      break;
+    default:
+      fatal_unexpected_iid(id);  
+  }
+
+  set_result(_gvn.transform(n));
+  return true;
+}
+
 bool LibraryCallKit::inline_profileBoolean() {
   Node* counts = argument(1);
   const TypeAryPtr* ary = NULL;