[issue3106] speedup some comparisons

[Raymond Hettinger]

Raymond Hettinger <rhettinger at users.sourceforge.net> added the comment:

You may get better timings if you more the types-are-equal test inside
the types-i-know test.  Instead of:
+		if (Py_TYPE(v) == Py_TYPE(w)) {
+			if (PyLong_CheckExact(v)) {
+				if (v == w)
+					break;
+				return PyLong_RichCompare(v, w, op);
+			}
+			if (PyUnicode_CheckExact(v)) {

Do something like:
+		if (PyLong_CheckExact(v)) {
+			if (Py_TYPE(v) == Py_TYPE(w)) {
+				if (v == w)
+					break;
+				return PyLong_RichCompare(v, w, op);
+			}
+		if (PyUnicode_CheckExact(v)) {
+			if (Py_TYPE(v) == Py_TYPE(w)) {

In general, I'm not too keen on adding this kind of dispatch code to
ceval.c.  It saves the time spent in PyObject_RichCompare() trying to
figure out where to delegate the work.  But it comes at the expense of
weighing down ALL of the other comparisons which haven't gotten a
short-cut specialization.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3106>
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