[issue7201] double Endian problem and more on arm
Mancausoft added the comment:
Mark Dickinson scrisse:
> The 4th failure (test_endian_double) probably has nothing to do with
> ctypes. See also issue #1762561.
I try to use the patch arm-float2.diff, but test result is the same:
==
FAIL: test_struct_return_2H
(ctypes.test.test_as_parameter.AsParamPropertyWrapperTestCase)
--
Traceback (most recent call last): File
"/mnt/root/stackless-2.6.3/Lib/ctypes/test/test_as_parameter.py", line
171, in test_struct_return_2H self.failUnlessEqual((s2h.x, s2h.y),
(99*2, 88*3)) AssertionError: (99, 88) != (198,
264)
==
FAIL: test_struct_return_2H
(ctypes.test.test_as_parameter.AsParamWrapperTestCase)
--
Traceback (most recent call last): File
"/mnt/root/stackless-2.6.3/Lib/ctypes/test/test_as_parameter.py", line
171, in test_struct_return_2H self.failUnlessEqual((s2h.x, s2h.y),
(99*2, 88*3)) AssertionError: (99, 88) != (198,
264)
==
FAIL: test_struct_return_2H
(ctypes.test.test_as_parameter.BasicWrapTestCase)
--
Traceback (most recent call last): File
"/mnt/root/stackless-2.6.3/Lib/ctypes/test/test_as_parameter.py", line
171, in test_struct_return_2H self.failUnlessEqual((s2h.x, s2h.y),
(99*2, 88*3)) AssertionError: (99, 88) != (198, 264)
==
FAIL: test_endian_double (ctypes.test.test_byteswap.Test)
--
Traceback (most recent call last):
File "/mnt/root/stackless-2.6.3/Lib/ctypes/test/test_byteswap.py",
line 137, in test_endian_double
self.failUnlessEqual(bin(struct.pack("
<http://bugs.python.org/issue7201>
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[issue7201] double Endian problem and more on arm
New submission from Mancausoft :
I compile python for arm (on debian etch) but it don't pass ctype
test:
==
FAIL: test_struct_return_2H
(ctypes.test.test_as_parameter.AsParamPropertyWrapperTestCase)
--
Traceback (most recent call last):
File
"/mnt/root/stackless-2.6.3/Lib/ctypes/test/test_as_parameter.py", line
171, in test_struct_return_2H
self.failUnlessEqual((s2h.x, s2h.y), (99*2, 88*3))
AssertionError: (99, 88) != (198, 264)
==
FAIL: test_struct_return_2H
(ctypes.test.test_as_parameter.AsParamWrapperTestCase)
--
Traceback (most recent call last):
File
"/mnt/root/stackless-2.6.3/Lib/ctypes/test/test_as_parameter.py", line
171, in test_struct_return_2H
self.failUnlessEqual((s2h.x, s2h.y), (99*2, 88*3))
AssertionError: (99, 88) != (198, 264)
==
FAIL: test_struct_return_2H
(ctypes.test.test_as_parameter.BasicWrapTestCase)
--
Traceback (most recent call last):
File
"/mnt/root/stackless-2.6.3/Lib/ctypes/test/test_as_parameter.py", line
171, in test_struct_return_2H
self.failUnlessEqual((s2h.x, s2h.y), (99*2, 88*3))
AssertionError: (99, 88) != (198, 264)
==
FAIL: test_endian_double (ctypes.test.test_byteswap.Test)
--
Traceback (most recent call last):
File "/mnt/root/stackless-2.6.3/Lib/ctypes/test/test_byteswap.py",
line 137, in test_endian_double
self.failUnlessEqual(bin(struct.pack("
<http://bugs.python.org/issue7201>
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[issue1678380] 0.0 and -0.0 identified, with surprising results
Mancausoft added the comment: Mark Dickinson scrisse: > > Mark Dickinson added the comment: > > Here's a patch for floats. Mancausoft, could you give this a try and > let me know whether it fixes the issue? it works. test_math Ran 39 tests in 23.561s OK test_float Ran 19 tests in 275.241s OK Mancausoft -- ___ Python tracker <http://bugs.python.org/issue1678380> ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1678380] 0.0 and -0.0 identified, with surprising results
Mancausoft added the comment: Mark Dickinson scrisse: > Mancausoft: is this little-endian, OABI? Mixed endian > If so, then I think I know what the problem is: the disambiguation > code in compile.c looks at the first and last bytes of the double to > distinguish 0.0 and -0.0; for mixed-endian (aka little-endian, > swapped words) doubles this will fail. > > The solution is to use copysign instead. I try: *p==0 && p[sizeof(double)-1]==0 && p[(sizeof(double)-1)/2]==0; and now the test_math result is: Ran 39 tests in 21.323s OK It's a safe patch? Mancausoft -- ___ Python tracker <http://bugs.python.org/issue1678380> ___ ___ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
[issue1678380] 0.0 and -0.0 identified, with surprising results
Mancausoft added the comment:
This bug is still present on arm.
Python 2.6.3
cs-e9302# cat ../prova.py
import math
print math.atan2(0., -0.)
print (math.copysign(4., -0.), -4.0)
print math.atan2(0., -0.)
print (math.copysign(4., -0.), -4.0)
print math.atan2(0., -0.)
cs-e9302# cat ../prova1.py
import math
print (math.copysign(4., -0.), -4.0)
print math.atan2(0., -0.)
print (math.copysign(4., -0.), -4.0)
print math.atan2(0., -0.)
cs-e9302# ./python ../prova1.py
(-4.0, -4.0)
-3.14159265359
(-4.0, -4.0)
-3.14159265359
cs-e9302# ./python ../prova.py
0.0
(4.0, -4.0)
0.0
(4.0, -4.0)
0.0
>>> from math import atan2
>>> x = -0.
>>> y = 0.
>>> print atan2(y, -1.)
3.14159265359
>>> exec("from math import atan2; x = -0.; y = 0.; print atan2(y,
-1.)")
-3.14159265359
>>> x = -0.; atan2(0., -1)
-3.1415926535897931
>>> x = 0.; atan2(0., -1)
3.1415926535897931
==
FAIL: testAtan2 (__main__.MathTests)
--
Traceback (most recent call last):
File "Lib/test/test_math.py", line 131, in testAtan2
self.ftest('atan2(0., -0.)', math.atan2(0., -0.), math.pi)
File "Lib/test/test_math.py", line 57, in ftest
(name, value, expected))
AssertionError: atan2(0., -0.) returned 0.0, expected
3.1415926535897931
==
FAIL: testCopysign (__main__.MathTests)
--
Traceback (most recent call last):
File "Lib/test/test_math.py", line 806, in testCopysign
self.assertEqual(math.copysign(4., -0.), -4.0)
AssertionError: 4.0 != -4.0
--
--
nosy: +mancausoft
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