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Use a do-while loop in the inner loop for rotate (m is always greater than zero).

This commit is contained in:
Raymond Hettinger 2013-07-13 17:03:58 -07:00
parent 3959af9b2a
commit 840533bf1c
1 changed files with 6 additions and 2 deletions
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8
Modules/_collectionsmodule.c
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@ -506,13 +506,15 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
rightindex -= m;
leftindex -= m;
n -= m;
while (m--)
do {
*(dest--) = *(src--);
} while (--m);
}
if (rightindex == -1) {
block *prevblock = rightblock->leftlink;
assert(leftblock != rightblock);
assert(b == NULL);
b = rightblock;
CHECK_NOT_END(prevblock);
MARK_END(prevblock->rightlink);
@ -551,13 +553,15 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
leftindex += m;
rightindex += m;
n += m;
while (m--)
do {
*(dest++) = *(src++);
} while (--m);
}
if (leftindex == BLOCKLEN) {
block *nextblock = leftblock->rightlink;
assert(leftblock != rightblock);
assert(b == NULL);
b = leftblock;
CHECK_NOT_END(nextblock);
MARK_END(nextblock->leftlink);