STINNER Victor <victor.stin...@haypocalc.com> added the comment: Issue #11888: Use system log2() when available http://hg.python.org/cpython/rev/565f43f6bed4
"I expect the system libc to use more accurate functions than Python." You know what? Mac OS X log2 is less accurate than Python log2! A log2 test failed on "x86 Tiger 3.x": http://www.python.org/dev/buildbot/all/builders/x86%20Tiger%203.x/builds/2488 ====================================================================== FAIL: testLog2 (test.test_math.MathTests) ---------------------------------------------------------------------- Traceback (most recent call last): File "/Users/db3l/buildarea/3.x.bolen-tiger/build/Lib/test/test_math.py", line 658, in testLog2 self.assertEqual(actual, expected) AssertionError: Lists differ: [-324.0, -323.0, -322.0, -321.... != [-324.0, -323.0, -322.0, -321.... First differing element 69: -254.99999999999997 -255.0 ---------------------------------------------------------------------- Should I revert my patch or should we test the system log2 in configure to check if it is as accurate or more accurate than Mark's algorithm? ---------- _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue11888> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
