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Issue 1678380: fix a bug identifying -0.0 and 0.0

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This commit is contained in:
Mark Dickinson 2008-01-21 21:54:47 +00:00
parent 78d50ccdf9
commit 2bebadfe51
3 changed files with 38 additions and 1 deletions
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15
Python/compile.c
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@ -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;