--- old/src/hotspot/share/opto/library_call.cpp	2018-11-21 09:45:19.127274907 -0600
+++ new/src/hotspot/share/opto/library_call.cpp	2018-11-21 09:45:18.537294436 -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_c:
+  case vmIntrinsics::_isLowerCase_c:
+  case vmIntrinsics::_isUpperCase_c:
+  case vmIntrinsics::_isWhitespace_c:
+    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 +6562,58 @@
   return true;
 }
 
+bool LibraryCallKit::inline_character_compare(vmIntrinsics::ID id) {
+  if (!control()->is_Region()) {
+    return false;
+  }
+  RegionNode* r = control()->as_Region();
+
+  // argument(0) is receiver
+  Node* codePoint = argument(1);
+  Node* n = NULL;
+
+  switch (id) {
+    case vmIntrinsics::_isDigit_c :
+      if (!Matcher::match_rule_supported(Op_DigitC)) {
+        return false;
+      }
+      n = new DigitCNode(0, codePoint);
+      break;
+    case vmIntrinsics::_isLowerCase_c :
+      if (!Matcher::match_rule_supported(Op_LowerCaseC)) {
+        return false;
+      }
+      n = new LowerCaseCNode(0,  codePoint);
+      break;
+    case vmIntrinsics::_isUpperCase_c :
+      if (!Matcher::match_rule_supported(Op_UpperCaseC)) {
+        return false;
+      }
+      n = new UpperCaseCNode(0, codePoint);
+      break;
+    case vmIntrinsics::_isWhitespace_c :
+      if (!Matcher::match_rule_supported(Op_WhitespaceC)) {
+        return false;
+      }
+      n = new WhitespaceCNode(0, codePoint);
+      break;
+    default:
+      fatal_unexpected_iid(id);  
+  }
+
+  RegionNode *rgn = new RegionNode(2);
+  PhiNode *phi = new PhiNode(rgn, TypeInt::CHAR);
+
+  // Swap current RegionNode with new one
+  Node* new_ctrl = r->in(1);
+  r->del_req(1);
+  rgn->init_req(1, new_ctrl);
+  phi->init_req(1, _gvn.transform(n));
+  set_result(rgn, phi);
+
+  return true;
+}
+
 bool LibraryCallKit::inline_profileBoolean() {
   Node* counts = argument(1);
   const TypeAryPtr* ary = NULL;