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bpo-29304: simplify lookdict_index() function. (GH-2273)

This commit is contained in:
INADA Naoki 2017-06-23 15:22:50 +09:00 committed by GitHub
parent 279a96206f
commit 073ae487b3
1 changed files with 6 additions and 15 deletions
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21
Objects/dictobject.c
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@ -631,29 +631,20 @@ PyDict_New(void)
static Py_ssize_t
lookdict_index(PyDictKeysObject *k, Py_hash_t hash, Py_ssize_t index)
{
size_t i;
size_t mask = DK_MASK(k);
Py_ssize_t ix;
size_t perturb = (size_t)hash;
size_t i = (size_t)hash & mask;
i = (size_t)hash & mask;
ix = dk_get_index(k, i);
if (ix == index) {
return i;
}
if (ix == DKIX_EMPTY) {
return DKIX_EMPTY;
}
for (size_t perturb = hash;;) {
perturb >>= PERTURB_SHIFT;
i = mask & ((i << 2) + i + perturb + 1);
ix = dk_get_index(k, i);
for (;;) {
Py_ssize_t ix = dk_get_index(k, i);
if (ix == index) {
return i;
}
if (ix == DKIX_EMPTY) {
return DKIX_EMPTY;
}
perturb >>= PERTURB_SHIFT;
i = mask & (i*5 + perturb + 1);
}
assert(0); /* NOT REACHED */
return DKIX_ERROR;