[pypy-commit] pypy default: A controversial checkin - try to limit the size of write analyzer analysis

[fijal]

Author: Maciej Fijalkowski <fijall at gmail.com>
Branch: 
Changeset: r67557:c89621c833be
Date: 2013-10-24 11:21 +0200
http://bitbucket.org/pypy/pypy/changeset/c89621c833be/

Log:	A controversial checkin - try to limit the size of write analyzer
	analysis

diff --git a/rpython/translator/backendopt/writeanalyze.py b/rpython/translator/backendopt/writeanalyze.py
--- a/rpython/translator/backendopt/writeanalyze.py
+++ b/rpython/translator/backendopt/writeanalyze.py
@@ -4,6 +4,7 @@
 top_set = object()
 empty_set = frozenset()
 
+CUTOFF = 1000
 
 class WriteAnalyzer(graphanalyze.GraphAnalyzer):
     def bottom_result(self):
@@ -21,6 +22,8 @@
     def add_to_result(self, result, other):
         if other is top_set:
             return top_set
+        if len(other) + len(result) > CUTOFF:
+            return top_set
         result.update(other)
         return result