Java String intern() speedup

gistfile1.diff

diff -r 2bfa00fac03f src/share/vm/classfile/javaClasses.cpp
--- a/src/share/vm/classfile/javaClasses.cpp	Thu Jul 04 01:00:19 2013 -0700
+++ b/src/share/vm/classfile/javaClasses.cpp	Sun Aug 04 22:08:03 2013 -0700
@@ -322,9 +322,7 @@
 
   jchar* result = NEW_RESOURCE_ARRAY_RETURN_NULL(jchar, length);
   if (result != NULL) {
-    for (int index = 0; index < length; index++) {
-      result[index] = value->char_at(index + offset);
-    }
+    value->char_cpy(result, offset, length);
   } else {
     THROW_MSG_0(vmSymbols::java_lang_OutOfMemoryError(), "could not allocate Unicode string");
   }
@@ -430,12 +428,8 @@
   if (length != len) {
     return false;
   }
-  for (int i = 0; i < len; i++) {
-    if (value->char_at(i + offset) != chars[i]) {
-      return false;
-    }
-  }
-  return true;
+
+  return value->char_cmp(chars, offset, len) == 0;
 }
 
 void java_lang_String::print(Handle java_string, outputStream* st) {
diff -r 2bfa00fac03f src/share/vm/oops/typeArrayOop.hpp
--- a/src/share/vm/oops/typeArrayOop.hpp	Thu Jul 04 01:00:19 2013 -0700
+++ b/src/share/vm/oops/typeArrayOop.hpp	Sun Aug 04 22:08:03 2013 -0700
@@ -91,6 +91,21 @@
     return &char_base()[which];
   }
 
+  int char_cmp(jchar *to, size_t my_offset, size_t len) const {
+    if (len == 0) return 0;
+    assert(is_within_bounds(my_offset), "start index out of bounds");
+    assert(is_within_bounds(my_offset + len - 1), "end index out of bounds");
+    return memcmp(to, char_base() + my_offset, len * sizeof(jchar));
+  }
+
+  void char_cpy(jchar *to, size_t my_offset, size_t len) const {
+    if (len == 0) return;
+    assert(is_within_bounds(my_offset), "start index out of bounds");
+    assert(is_within_bounds(my_offset + len - 1), "end index out of bounds");
+    memcpy(to, char_base() + my_offset, len * sizeof(jchar));
+  }
+
+
   jint* int_at_addr(int which) const {
     assert(is_within_bounds(which), "index out of bounds");
     return &int_base()[which];