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Improve code clarity for the set lookup logic #20028

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Merged
rhettinger merged 2 commits into from
May 10, 2020
Merged

Improve code clarity for the set lookup logic #20028

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37f079e
Improve code clarity for the set lookup logic
rhettinger May 10, 2020
e650fef
Improve variable name
rhettinger May 10, 2020
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Improve variable name
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@rhettinger
rhettinger committed May 10, 2020
commit e650fefafd869c27395e57ccdea8a0ca0bdeaf1f
12 changes: 6 additions & 6 deletions Objects/setobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -60,12 +60,12 @@ set_lookkey(PySetObject *so, PyObject *key, Py_hash_t hash)
size_t perturb = hash;
size_t mask = so->mask;
size_t i = (size_t)hash & mask; /* Unsigned for defined overflow behavior */
size_t j;
int probes;
int cmp;

while (1) {
entry = &so->table[i];
j = (i + LINEAR_PROBES <= mask) ? LINEAR_PROBES: 0;
probes = (i + LINEAR_PROBES <= mask) ? LINEAR_PROBES: 0;
do {
if (entry->hash == 0 && entry->key == NULL)
return entry;
Expand All @@ -91,7 +91,7 @@ set_lookkey(PySetObject *so, PyObject *key, Py_hash_t hash)
mask = so->mask;
}
entry++;
} while (j--);
} while (probes--);
perturb >>= PERTURB_SHIFT;
i = (i * 5 + 1 + perturb) & mask;
}
Expand All @@ -107,7 +107,7 @@ set_add_entry(PySetObject *so, PyObject *key, Py_hash_t hash)
size_t perturb;
size_t mask;
size_t i; /* Unsigned for defined overflow behavior */
size_t j;
int probes;
int cmp;

/* Pre-increment is necessary to prevent arbitrary code in the rich
Expand All @@ -122,7 +122,7 @@ set_add_entry(PySetObject *so, PyObject *key, Py_hash_t hash)

while (1) {
entry = &so->table[i];
j = (i + LINEAR_PROBES <= mask) ? LINEAR_PROBES: 0;
probes = (i + LINEAR_PROBES <= mask) ? LINEAR_PROBES: 0;
do {
if (entry->hash == 0 && entry->key == NULL)
goto found_unused;
Expand All @@ -148,7 +148,7 @@ set_add_entry(PySetObject *so, PyObject *key, Py_hash_t hash)
mask = so->mask;
}
entry++;
} while (j--);
} while (probes--);
perturb >>= PERTURB_SHIFT;
i = (i * 5 + 1 + perturb) & mask;
}
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