Rev 4770: Add a quick shortcut when comparing item-by-item. in http://bazaar.launchpad.net/~jameinel/bzr/2.1-static-tuple-no-use

[John Arbash Meinel]

At http://bazaar.launchpad.net/~jameinel/bzr/2.1-static-tuple-no-use

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revno: 4770
revision-id: john at arbash-meinel.com-20091012180602-1zgs701z6oj3knb3
parent: john at arbash-meinel.com-20091012180207-gqjvwo80raq23gvq
committer: John Arbash Meinel <john at arbash-meinel.com>
branch nick: 2.1-static-tuple-no-use
timestamp: Mon 2009-10-12 13:06:02 -0500
message:
  Add a quick shortcut when comparing item-by-item.
  
  This should help the StaticTuple_Intern() case when the items being
  pointed to have also already been interned. It avoids a couple C
  function calls, which isn't a huge performance hit, but it is something.
-------------- next part --------------
=== modified file 'bzrlib/_static_tuple_c.c'
--- a/bzrlib/_static_tuple_c.c	2009-10-12 18:02:07 +0000
+++ b/bzrlib/_static_tuple_c.c	2009-10-12 18:06:02 +0000
@@ -389,6 +389,10 @@
         PyObject *result = NULL;
         v_obj = StaticTuple_GET_ITEM(v_st, i);
         w_obj = StaticTuple_GET_ITEM(w_st, i);
+        if (v_obj == w_obj) {
+            /* Shortcut case, these must be identical */
+            continue;
+        }
         if (PyString_CheckExact(v_obj) && PyString_CheckExact(w_obj)) {
             result = string_richcompare(v_obj, w_obj, Py_EQ);
         } else if (StaticTuple_CheckExact(v_obj) &&