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author | Mark Dickinson <dickinsm@gmail.com> | 2008-01-21 21:54:47 +0000 |
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committer | Mark Dickinson <dickinsm@gmail.com> | 2008-01-21 21:54:47 +0000 |
commit | 0b84a2edc937e703d948a28b1de02d24cd418cae (patch) | |
tree | 36e36c53a7826971aba9aa91676d145382185c33 /Python | |
parent | eb11fa87ff36451e3ef17b1866afd1896fbe261d (diff) | |
download | cpython-0b84a2edc937e703d948a28b1de02d24cd418cae.tar.gz |
Issue 1678380: fix a bug identifying -0.0 and 0.0
Diffstat (limited to 'Python')
-rw-r--r-- | Python/compile.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/Python/compile.c b/Python/compile.c index ce19aa9df4..0e824caabd 100644 --- a/Python/compile.c +++ b/Python/compile.c @@ -1567,7 +1567,20 @@ compiler_add_o(struct compiler *c, PyObject *dict, PyObject *o) Py_ssize_t arg; /* necessary to make sure types aren't coerced (e.g., int and long) */ - t = PyTuple_Pack(2, o, o->ob_type); + /* _and_ to distinguish 0.0 from -0.0 e.g. on IEEE platforms */ + if (PyFloat_Check(o)) { + double d = PyFloat_AS_DOUBLE(o); + unsigned char* p = (unsigned char*) &d; + /* all we need is to make the tuple different in either the 0.0 + * or -0.0 case from all others, just to avoid the "coercion". + */ + if (*p==0 && p[sizeof(double)-1]==0) + t = PyTuple_Pack(3, o, o->ob_type, Py_None); + else + t = PyTuple_Pack(2, o, o->ob_type); + } else { + t = PyTuple_Pack(2, o, o->ob_type); + } if (t == NULL) return -1; |