[Patches] [ python-Patches-424475 ] Speed-up tp_compare usage

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Patches item #424475, was updated on 2001-05-16 01:07
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Category: core (C code)
Group: None
Status: Open
>Resolution: Accepted
Priority: 5
Submitted By: Martin v. Löwis (loewis)
>Assigned to: Martin v. Löwis (loewis)
Summary: Speed-up tp_compare usage

Initial Comment:
This patch tries to optimize PyObject_RichCompare for
the common case of objects with equal types which
support tp_compare. It gives a speed-up of roughly 7%
for comparing strings in a loop.

The patch also gives type objects a tp_compare
function, so that they can make use of the improvement.

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>Comment By: Tim Peters (tim_one)
Date: 2001-06-07 13:19

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Accepted and assigned back to Martin.  This is too valuable 
to quibble over.  Note that when calling a tp_compare slot, 
this kind of thing:

.	c = (*f)(v, w);
.	if (PyErr_Occurred())

is better spelled:

.	c = (*f)(v, w);
.	if (c < 0 && Py_Err_Occurred())


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Comment By: Martin v. Löwis (loewis)
Date: 2001-05-21 09:57

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The revised patch prefers tp_compare over tp_richcompare in
do_cmp if both are available. It also restores
UserList.__cmp__ from deprecation.

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