From: Victor Stinner <victor.stinner@gmail.com>
Date: Wed, 17 Aug 2016 17:48:33 +0000 (+0200)
Subject: Issue #27786: Simplify x_sub()
X-Git-Tag: v3.6.0b1~679
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=8bcf312d093cd90ca65b329d3f97ec2a1304c5b3;p=python

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.
---

diff --git a/Objects/longobject.c b/Objects/longobject.c
index d49594d129..4b2b6021a9 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);
 }