[Python-checkins] cpython: Issue #12744: Fix inefficient representation of integers
antoine.pitrou
python-checkins at python.org
Sat Aug 13 20:19:40 CEST 2011
http://hg.python.org/cpython/rev/8e824e09924a
changeset: 71860:8e824e09924a
user: Antoine Pitrou <solipsis at pitrou.net>
date: Sat Aug 13 20:15:19 2011 +0200
summary:
Issue #12744: Fix inefficient representation of integers
between 2**31 and 2**63 on systems with a 64-bit C "long".
files:
Lib/test/pickletester.py | 10 ++++++++++
Misc/NEWS | 3 +++
Modules/_pickle.c | 2 +-
3 files changed, 14 insertions(+), 1 deletions(-)
diff --git a/Lib/test/pickletester.py b/Lib/test/pickletester.py
--- a/Lib/test/pickletester.py
+++ b/Lib/test/pickletester.py
@@ -1118,6 +1118,16 @@
empty = self.loads(b'\x80\x03U\x00q\x00.', encoding='koi8-r')
self.assertEqual(empty, '')
+ def test_int_pickling_efficiency(self):
+ # Test compacity of int representation (see issue #12744)
+ for proto in protocols:
+ sizes = [len(self.dumps(2**n, proto)) for n in range(70)]
+ # the size function is monotonous
+ self.assertEqual(sorted(sizes), sizes)
+ if proto >= 2:
+ self.assertLessEqual(sizes[-1], 14)
+
+
# Test classes for reduce_ex
class REX_one(object):
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -254,6 +254,9 @@
Library
-------
+- Issue #12744: Fix inefficient representation of integers between 2**31 and
+ 2**63 on systems with a 64-bit C "long".
+
- Issue #12646: Add an 'eof' attribute to zlib.Decompress, to make it easier to
detect truncated input streams.
diff --git a/Modules/_pickle.c b/Modules/_pickle.c
--- a/Modules/_pickle.c
+++ b/Modules/_pickle.c
@@ -1540,7 +1540,7 @@
/* out of range for int pickling */
PyErr_Clear();
}
- else
+ else if (val <= 0x7fffffffL && val >= -0x80000000L)
return save_int(self, val);
if (self->proto >= 2) {
--
Repository URL: http://hg.python.org/cpython
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