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Move the freeblock() call outside the main loop to speed-up and simplify the block re-use logic.

This commit is contained in:
Raymond Hettinger 2013-07-13 02:34:08 -07:00
parent ae13ff1c5f
commit 3959af9b2a
1 changed files with 15 additions and 9 deletions
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24
Modules/_collectionsmodule.c
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@ -454,12 +454,13 @@ deque_inplace_concat(dequeobject *deque, PyObject *other)
static int
_deque_rotate(dequeobject *deque, Py_ssize_t n)
{
block *b = NULL;
block *leftblock = deque->leftblock;
block *rightblock = deque->rightblock;
Py_ssize_t leftindex = deque->leftindex;
Py_ssize_t rightindex = deque->rightindex;
Py_ssize_t len=Py_SIZE(deque), halflen=len>>1;
int rv = 0;
int rv = -1;
if (len <= 1)
return 0;
@ -476,10 +477,10 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
deque->state++;
while (n > 0) {
if (leftindex == 0) {
block *b = newblock(len);
if (b == NULL) {
rv = -1;
goto done;
b = newblock(len);
if (b == NULL)
goto done;
}
b->rightlink = leftblock;
CHECK_END(leftblock->leftlink);
@ -487,6 +488,7 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
leftblock = b;
MARK_END(b->leftlink);
leftindex = BLOCKLEN;
b = NULL;
}
assert(leftindex > 0);
@ -511,7 +513,7 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
if (rightindex == -1) {
block *prevblock = rightblock->leftlink;
assert(leftblock != rightblock);
freeblock(rightblock);
b = rightblock;
CHECK_NOT_END(prevblock);
MARK_END(prevblock->rightlink);
rightblock = prevblock;
@ -520,10 +522,10 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
}
while (n < 0) {
if (rightindex == BLOCKLEN - 1) {
block *b = newblock(len);
if (b == NULL) {
rv = -1;
goto done;
b = newblock(len);
if (b == NULL)
goto done;
}
b->leftlink = rightblock;
CHECK_END(rightblock->rightlink);
@ -531,6 +533,7 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
rightblock = b;
MARK_END(b->rightlink);
rightindex = -1;
b = NULL;
}
assert (rightindex < BLOCKLEN - 1);
@ -555,14 +558,17 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
if (leftindex == BLOCKLEN) {
block *nextblock = leftblock->rightlink;
assert(leftblock != rightblock);
freeblock(leftblock);
b = leftblock;
CHECK_NOT_END(nextblock);
MARK_END(nextblock->leftlink);
leftblock = nextblock;
leftindex = 0;
}
}
rv = 0;
done:
if (b != NULL)
freeblock(b);
deque->leftblock = leftblock;
deque->rightblock = rightblock;
deque->leftindex = leftindex;