From 306d6b1ea6bf2582b9284be2fd27275abbade3e1 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Sun, 24 Jan 2016 12:40:42 -0800
Subject: [PATCH] Convert another post-decrement while-loop to pre-decrement
for consistency and better generated code (on both GCC and CLang).
---
Modules/_collectionsmodule.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/Modules/_collectionsmodule.c b/Modules/_collectionsmodule.c
index cc9e4e890e..b77ea652fb 100644
--- a/Modules/_collectionsmodule.c
+++ b/Modules/_collectionsmodule.c
@@ -895,7 +895,8 @@ deque_reverse(dequeobject *deque, PyObject *unused)
Py_ssize_t n = Py_SIZE(deque) >> 1;
PyObject *tmp;
- while (n-- > 0) {
+ n++;
+ while (--n) {
/* Validate that pointers haven't met in the middle */
assert(leftblock != rightblock || leftindex < rightindex);
CHECK_NOT_END(leftblock);
--
2.40.0