[pypy-svn] pypy default: ok, I managed to turn this into a failing test

[antocuni]

Author: Antonio Cuni <anto.cuni at gmail.com>
Branch: 
Changeset: r43530:9e324d398a15
Date: 2011-04-22 12:14 +0200
http://bitbucket.org/pypy/pypy/changeset/9e324d398a15/

Log:	ok, I managed to turn this into a failing test

diff --git a/pypy/module/pypyjit/test_pypy_c/test_pypy_c_new.py b/pypy/module/pypyjit/test_pypy_c/test_pypy_c_new.py
--- a/pypy/module/pypyjit/test_pypy_c/test_pypy_c_new.py
+++ b/pypy/module/pypyjit/test_pypy_c/test_pypy_c_new.py
@@ -1589,16 +1589,18 @@
         assert loop.match_by_id('lshift', "")  # guard optimized away
 
     def test_lshift_and_then_rshift(self):
-        def main(a, b):
+        py.test.skip('fixme, this optimization is disabled')
+        def main(b):
             res = 0
+            a = 0
             while res < 300:
-                assert 0 <= a <= 10
+                assert a >= 0
                 assert 0 <= b <= 10
-                val = (a << b) >> b     # ID: shift
-                res += val
+                res = (a << b) >> b     # ID: shift
+                a += 1
             return res
         #
-        log = self.run(main, [1, 2], threshold=200)
+        log = self.run(main, [2], threshold=200)
         assert log.result == 300
         loop, = log.loops_by_filename(self.filepath)
         assert loop.match_by_id('shift', "")  # optimized away