New issue 2145: lib-python/2.7/test/test_long.py fails on ppc-updated-backend branch https://bitbucket.org/pypy/pypy/issues/2145/lib-python-27-test-test_longpy-fails-on
Vaibhav Sood: Hi, I tried running lib-python/2.7/test/test_long.py on the 'ppc-updated-backend' branch and it fails with the following error: FAIL: test_mixed_compares (test.test_long.LongTest) ---------------------------------------------------------------------- Traceback (most recent call last): File "/home/test/vaibhav/pypy/lib-python/2.7/test/test_long.py", line 864, in test_mixed_compares eq(Rcmp, xycmp, Frm("%r %r %d %d", x, y, Rcmp, xycmp)) AssertionError: 9223372036854775807 9.223372036854776e+18 -1 0 ---------------------------------------------------------------------- I tried investigating the issue, the error seems to be due to floating point comparison between a float and a long not being handled correctly in pypy on ppc On a x86 machine: vaibhav@vaibhav-VirtualBox:~/work-code/pypy$ pypy Python 2.7.3 (2.2.1+dfsg-1ubuntu0.2, Dec 02 2014, 23:00:55) [PyPy 2.2.1 with GCC 4.8.2] on linux2 Type "help", "copyright", "credits" or "license" for more information. And now for something completely different: ``in PyPy being only moderately magic is a good thing <cfbolz>'' >>>> import sys >>>> from decimal import Decimal >>>> Decimal(sys.maxint), Decimal(float(sys.maxint)) (Decimal('9223372036854775807'), Decimal('9223372036854775808')) >>>> sys.maxint == float(sys.maxint) False >>>> On a ppc64le machine: test@pts00449-vm9:~/vaibhav/pypy$ pypy Python 2.7.6 (2.3.1+dfsg-1, Jun 10 2014, 17:11:35) [PyPy 2.3.1 with GCC 4.9.0] on linux2 Type "help", "copyright", "credits" or "license" for more information. >>>> import sys >>>> from decimal import Decimal >>>> Decimal(sys.maxint), Decimal(float(sys.maxint)) (Decimal('9223372036854775807'), Decimal('9223372036854775808')) >>>> sys.maxint == float(sys.maxint) True >>>> So on a PowerPC the overflow caused by float(sys.maxint) is not handled correctly _______________________________________________ pypy-issue mailing list pypy-issue@python.org https://mail.python.org/mailman/listinfo/pypy-issue