On Sun, Jan 18, 2009 at 11:03 PM, scott mc <scott...@gmail.com> wrote: > I built 2.7 on Haiku, but am getting failures in the regression tests. > Many of them are in math related tests, failing in the 15th decimal > place on test_decimal and a few others like that, I posted a ticket on > Haiku's trac for that as it might be related to Haiku's built in math > lib? (libm is built into Haiku's libroot.so) > http://dev.haiku-os.org/ticket/3308
Most of these look like libm/libc precision problems to me, of varying severity. Some particular comments: - the test_float result is worrying: there are a good few places where Python depends on eval(repr(.)) round-tripping for floats, and it looks as though either the eval or the repr is losing significant accuracy. Actually, there's so much accuracy loss that I wonder whether something's being cast from double precision to single precision at some point. - test_decimal failing was a bit of a surprise until I saw which test was failing: the decimal module quite deliberately does all computation using integer arithmetic, and avoids floating-point like the plague, so it should be ultra-portable. Except, of course, the recently added from_float method, which converts from floats to decimals. So fix up the floating-point and test_decimal should pass again. - I don't understand where the test_marshall and test_random failures are coming from. These could be Python problems (though I think it's more likely that they're Haiku floating-point problems). I'd be interested to see short code-snippets that reproduce these issues. - I wouldn't worry so much about the test_math and test_cmath failures until you get the others sorted out; the tests are probably stricter than they need to be. Mark _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
