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Heapq: Code clean-up. Remove unnecessary pre-increment before the loop starts. by rhettinger · Pull Request #3312 · python/cpython · GitHub

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Heapq: Code clean-up. Remove unnecessary pre-increment before the loop starts. #3312

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Merged
rhettinger merged 1 commit into from
Sep 4, 2017
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Heapq: Code clean-up. Remove unnecessary pre-increment before the loop starts. #3312

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27 changes: 10 additions & 17 deletions Modules/_collectionsmodule.c
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Original file line number Diff line number Diff line change
Expand Up @@ -938,8 +938,7 @@ deque_reverse(dequeobject *deque, PyObject *unused)
Py_ssize_t n = Py_SIZE(deque) >> 1;
PyObject *tmp;

n++;
while (--n) {
while (--n >= 0) {
/* Validate that pointers haven't met in the middle */
assert(leftblock != rightblock || leftindex < rightindex);
CHECK_NOT_END(leftblock);
Expand Down Expand Up @@ -981,8 +980,7 @@ deque_count(dequeobject *deque, PyObject *v)
PyObject *item;
int cmp;

n++;
while (--n) {
while (--n >= 0) {
CHECK_NOT_END(b);
item = b->data[index];
cmp = PyObject_RichCompareBool(item, v, Py_EQ);
Expand Down Expand Up @@ -1019,8 +1017,7 @@ deque_contains(dequeobject *deque, PyObject *v)
PyObject *item;
int cmp;

n++;
while (--n) {
while (--n >= 0) {
CHECK_NOT_END(b);
item = b->data[index];
cmp = PyObject_RichCompareBool(item, v, Py_EQ);
Expand Down Expand Up @@ -1088,13 +1085,13 @@ deque_index(dequeobject *deque, PyObject **args, Py_ssize_t nargs)
}
}

n = stop - i + 1;
while (--n) {
n = stop - i;
while (--n >= 0) {
CHECK_NOT_END(b);
item = b->data[index];
cmp = PyObject_RichCompareBool(item, v, Py_EQ);
if (cmp > 0)
return PyLong_FromSsize_t(stop - n);
return PyLong_FromSsize_t(stop - n - 1);
if (cmp < 0)
return NULL;
if (start_state != deque->state) {
Expand Down Expand Up @@ -1228,16 +1225,14 @@ deque_item(dequeobject *deque, Py_ssize_t i)
i = (Py_ssize_t)((size_t) i % BLOCKLEN);
if (index < (Py_SIZE(deque) >> 1)) {
b = deque->leftblock;
n++;
while (--n)
while (--n >= 0)
b = b->rightlink;
} else {
n = (Py_ssize_t)(
((size_t)(deque->leftindex + Py_SIZE(deque) - 1))
/ BLOCKLEN - n);
b = deque->rightblock;
n++;
while (--n)
while (--n >= 0)
b = b->leftlink;
}
}
Expand Down Expand Up @@ -1281,16 +1276,14 @@ deque_ass_item(dequeobject *deque, Py_ssize_t i, PyObject *v)
i = (Py_ssize_t)((size_t) i % BLOCKLEN);
if (index <= halflen) {
b = deque->leftblock;
n++;
while (--n)
while (--n >= 0)
b = b->rightlink;
} else {
n = (Py_ssize_t)(
((size_t)(deque->leftindex + Py_SIZE(deque) - 1))
/ BLOCKLEN - n);
b = deque->rightblock;
n++;
while (--n)
while (--n >= 0)
b = b->leftlink;
}
Py_INCREF(v);
Expand Down
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