[pypy-commit] pypy default: Optimize join_results for write analyze.

[alex_gaynor]

Author: Alex Gaynor <alex.gaynor at gmail.com>
Branch: 
Changeset: r59462:0f2f6fcca4d3
Date: 2012-12-16 04:01 -0800
http://bitbucket.org/pypy/pypy/changeset/0f2f6fcca4d3/

Log:	Optimize join_results for write analyze.

diff --git a/pypy/translator/backendopt/writeanalyze.py b/pypy/translator/backendopt/writeanalyze.py
--- a/pypy/translator/backendopt/writeanalyze.py
+++ b/pypy/translator/backendopt/writeanalyze.py
@@ -16,6 +16,15 @@
         return result1.union(result2)
 
     @staticmethod
+    def join_results(results):
+        result = set()
+        for res in results:
+            if res is top_set:
+                return top_set
+            result |= res
+        return frozenset(result)
+
+    @staticmethod
     def bottom_result():
         return empty_set