--- a/src/hotspot/share/opto/library_call.cpp	Wed Jun 27 19:09:17 2018 -0700
+++ b/src/hotspot/share/opto/library_call.cpp	Wed Jun 27 20:21:42 2018 -0700
@@ -298,6 +298,7 @@
   Node* get_key_start_from_aescrypt_object(Node* aescrypt_object);
   Node* get_original_key_start_from_aescrypt_object(Node* aescrypt_object);
   bool inline_ghash_processBlocks();
+  bool inline_base64_encodeBlock();
   bool inline_sha_implCompress(vmIntrinsics::ID id);
   bool inline_digestBase_implCompressMB(int predicate);
   bool inline_sha_implCompressMB(Node* digestBaseObj, ciInstanceKlass* instklass_SHA,
@@ -833,6 +834,8 @@
 
   case vmIntrinsics::_ghash_processBlocks:
     return inline_ghash_processBlocks();
+  case vmIntrinsics::_base64_encodeBlock:
+    return inline_base64_encodeBlock();
 
   case vmIntrinsics::_encodeISOArray:
   case vmIntrinsics::_encodeByteISOArray:
@@ -6084,6 +6087,35 @@
   return true;
 }
 
+bool LibraryCallKit::inline_base64_encodeBlock() {
+  address stubAddr;
+  const char *stubName;
+  assert(UseBASE64Intrinsics, "need Base64 intrinsics support");
+  assert(callee()->signature()->size() == 6, "base64_encodeBlock has 6 parameters");
+  stubAddr = StubRoutines::base64_encodeBlock();
+  stubName = "encodeBlock";
+
+  if (!stubAddr) return false;
+  Node* base64obj = argument(0);
+  Node* src = argument(1);
+  Node* offset = argument(2);
+  Node* len = argument(3);
+  Node* dest = argument(4);
+  Node* dp = argument(5);
+  Node* isURL = argument(6);
+
+  Node* src_start = array_element_address(src, intcon(0), T_BYTE);
+  assert(src_start, "source array is NULL");
+  Node* dest_start = array_element_address(dest, intcon(0), T_BYTE);
+  assert(dest_start, "destination array is NULL");
+
+  Node* base64 = make_runtime_call(RC_LEAF,
+                                   OptoRuntime::base64_encodeBlock_Type(),
+                                   stubAddr, stubName, TypePtr::BOTTOM,
+                                   src_start, offset, len, dest_start, dp, isURL);
+  return true;
+}
+
 //------------------------------inline_sha_implCompress-----------------------
 //
 // Calculate SHA (i.e., SHA-1) for single-block byte[] array.