Raymond Hettinger added the comment:
Here's an excerpt of the patch that gives a pretty good idea of that is being
changed (there are essentially three lines of new logic):
static void
set_insert_clean(PySetObject *so, PyObject *key, Py_hash_t hash)
{
setentry *table = so->table;
setentry *entry;
size_t perturb = hash;
size_t mask = (size_t)so->mask;
size_t i, j; // the j variable is new
i = j = (size_t)hash & mask;
while(1) {
entry = &table[j];
if (entry->key == NULL)
break;
entry = &table[j ^ 1]; // this line is new
if (entry->key == NULL) // this line is new
break; // this line new
i = i * 5 + perturb + 1;
j = i & mask;
perturb >>= PERTURB_SHIFT;
}
so->fill++;
entry->key = key;
entry->hash = hash;
so->used++;
}
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<http://bugs.python.org/issue18771>
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