mirrors/cpython
1
0
Fork 0
mirror of https://github.com/python/cpython.git synced 2025-11-25 21:11:09 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 10

Fix compile.c so that it records 0.0 and -0.0 as separate constants in a code

Browse source 
object's co_consts tuple; add a test to show that the previous behavior (where
these two constants were "collapsed" into one) causes serious malfunctioning.
This commit is contained in:
Alex Martelli 2007-08-22 21:14:17 +00:00
parent 89e975fc74
commit d8672aa8a4
2 changed files with 29 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

15
Python/compile.c
View file

@ -907,7 +907,20 @@ 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;