From 8bcf312d093cd90ca65b329d3f97ec2a1304c5b3 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Wed, 17 Aug 2016 19:48:33 +0200
Subject: [PATCH] Issue #27786: Simplify x_sub()

The z variable is known to be a fresh number which cannot be shared, Py_SIZE()
can be used directly to negate the number.
---
 Objects/longobject.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/Objects/longobject.c b/Objects/longobject.c
index d49594d1292..4b2b6021a9c 100644
--- a/Objects/longobject.c
+++ b/Objects/longobject.c
@@ -3000,9 +3000,7 @@ x_sub(PyLongObject *a, PyLongObject *b)
     }
     assert(borrow == 0);
     if (sign < 0) {
-        _PyLong_Negate(&z);
-        if (z == NULL)
-            return NULL;
+        Py_SIZE(z) = -Py_SIZE(z);
     }
     return long_normalize(z);
 }