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Optimization guides suggest copying memory in an ascending direction when possible.

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This commit is contained in:
Raymond Hettinger 2015-02-01 22:53:41 -08:00
parent 5d0bb852a2
commit 0e259f18f7
1 changed files with 3 additions and 3 deletions
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6
Modules/_collectionsmodule.c
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@ -534,13 +534,13 @@ _deque_rotate(dequeobject *deque, Py_ssize_t n)
if (m > leftindex) if (m > leftindex)
m = leftindex; m = leftindex;
assert (m > 0 && m <= len); assert (m > 0 && m <= len);
src = &rightblock->data[rightindex];
dest = &leftblock->data[leftindex - 1];
rightindex -= m; rightindex -= m;
leftindex -= m; leftindex -= m;
src = &rightblock->data[rightindex + 1];
dest = &leftblock->data[leftindex];
n -= m; n -= m;
do { do {
*(dest--) = *(src--); *(dest++) = *(src++);
} while (--m); } while (--m);
} }
if (rightindex == -1) { if (rightindex == -1) {