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Special case endpoint access for speed.

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This commit is contained in:
Raymond Hettinger 2004-03-04 08:00:54 +00:00
parent 30e97dbe96
commit 6c79a518e7
1 changed files with 18 additions and 10 deletions
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8
Modules/collectionsmodule.c
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@ -326,6 +326,13 @@ deque_item(dequeobject *deque, int i)
return NULL; return NULL;
} }
if (i == 0) {
i = deque->leftindex;
b = deque->leftblock;
} else if (i == deque->len - 1) {
i = deque->rightindex;
b = deque->rightblock;
} else {
i += deque->leftindex; i += deque->leftindex;
n = i / BLOCKLEN; n = i / BLOCKLEN;
i %= BLOCKLEN; i %= BLOCKLEN;
@ -339,6 +346,7 @@ deque_item(dequeobject *deque, int i)
while (n--) while (n--)
b = b->leftlink; b = b->leftlink;
} }
}
item = b->data[i]; item = b->data[i];
Py_INCREF(item); Py_INCREF(item);
return item; return item;