From: Robert Bradshaw <robertwb@math.washington.edu>
Date: Fri, 27 Feb 2009 08:22:20 +0000 (-0800)
Subject: Optimize negative indexing.
X-Git-Tag: 0.11.rc~21
X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=1e0af779a2e53bfb837d7c140b2ce0b9689eb534;p=cython.git

Optimize negative indexing.
---

diff --git a/Cython/Compiler/ExprNodes.py b/Cython/Compiler/ExprNodes.py
index 085decb6..d16edfd3 100644
--- a/Cython/Compiler/ExprNodes.py
+++ b/Cython/Compiler/ExprNodes.py
@@ -5418,8 +5418,8 @@ static INLINE PyObject *__Pyx_GetItemInt_%(type)s(PyObject *o, Py_ssize_t i, int
             Py_INCREF(r);
             return r;
         }
-        else if ((i == -1) & likely(Py%(type)s_GET_SIZE(o) > 0)) {
-            PyObject *r = Py%(type)s_GET_ITEM(o, Py%(type)s_GET_SIZE(o) - 1);
+        else if ((-Py%(type)s_GET_SIZE(o) <= i) & (i < 0)) {
+            PyObject *r = Py%(type)s_GET_ITEM(o, Py%(type)s_GET_SIZE(o) + i);
             Py_INCREF(r);
             return r;
         }