New submission from Dennis Sweeney <[email protected]>:
The following tiny change:
diff --git a/Objects/listobject.c b/Objects/listobject.c
index 3c39c6444b..3ac03b71d0 100644
--- a/Objects/listobject.c
+++ b/Objects/listobject.c
@@ -2643,8 +2643,7 @@ list_richcompare(PyObject *v, PyObject *w, int op)
Py_INCREF(vitem);
Py_INCREF(witem);
- int k = PyObject_RichCompareBool(vl->ob_item[i],
- wl->ob_item[i], Py_EQ);
+ int k = PyObject_RichCompareBool(vitem, witem, Py_EQ);
Py_DECREF(vitem);
Py_DECREF(witem);
if (k < 0)
Creates the following performance improvement:
Before:
> .\python.bat -m timeit -s "A = list(range(10**7)); B = list(range(10**7))"
> "A==B"
2 loops, best of 5: 134 msec per loop
> .\python.bat -m timeit -s "A = list(range(10**7)); B = list(range(10**7))"
> "A==B"
2 loops, best of 5: 134 msec per loop
After:
> .\python.bat -m timeit -s "A = list(range(10**7)); B = list(range(10**7))"
> "A==B"
2 loops, best of 5: 126 msec per loop
> .\python.bat -m timeit -s "A = list(range(10**7)); B = list(range(10**7))"
> "A==B"
2 loops, best of 5: 126 msec per loop
----------
components: Interpreter Core
messages: 362566
nosy: Dennis Sweeney
priority: normal
severity: normal
status: open
title: Speed up list.__eq__ by about 6%
type: performance
versions: Python 3.9
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Python tracker <[email protected]>
<https://bugs.python.org/issue39737>
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