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Optimize PyUnicode_RichCompare() for Py_EQ and Py_NE: always use memcmp()

This commit is contained in:
Victor Stinner 2012-10-23 02:48:49 +02:00
parent 3a81580719
commit e5567ad236
1 changed files with 44 additions and 26 deletions
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70
Objects/unicodeobject.c
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@ -10296,6 +10296,32 @@ unicode_compare(PyObject *str1, PyObject *str2)
return 1;
}
static int
unicode_compare_eq(PyObject *str1, PyObject *str2)
{
int kind;
void *data1, *data2;
Py_ssize_t len;
int cmp;
/* a string is equal to itself */
if (str1 == str2)
return 1;
len = PyUnicode_GET_LENGTH(str1);
if (PyUnicode_GET_LENGTH(str2) != len)
return 0;
kind = PyUnicode_KIND(str1);
if (PyUnicode_KIND(str2) != kind)
return 0;
data1 = PyUnicode_DATA(str1);
data2 = PyUnicode_DATA(str2);
cmp = memcmp(data1, data2, len * kind);
return (cmp == 0);
}
int
PyUnicode_Compare(PyObject *left, PyObject *right)
{
@ -10346,33 +10372,27 @@ PyObject *
PyUnicode_RichCompare(PyObject *left, PyObject *right, int op)
{
int result;
PyObject *v;
if (PyUnicode_Check(left) && PyUnicode_Check(right)) {
PyObject *v;
if (PyUnicode_READY(left) == -1 ||
PyUnicode_READY(right) == -1)
return NULL;
if (PyUnicode_GET_LENGTH(left) != PyUnicode_GET_LENGTH(right) ||
PyUnicode_KIND(left) != PyUnicode_KIND(right)) {
if (op == Py_EQ) {
Py_INCREF(Py_False);
return Py_False;
}
if (op == Py_NE) {
Py_INCREF(Py_True);
return Py_True;
}
}
if (!PyUnicode_Check(left) || !PyUnicode_Check(right))
Py_RETURN_NOTIMPLEMENTED;
if (PyUnicode_READY(left) == -1 ||
PyUnicode_READY(right) == -1)
return NULL;
if (op == Py_EQ || op == Py_NE) {
result = unicode_compare_eq(left, right);
if (op == Py_EQ)
v = TEST_COND(result);
else
v = TEST_COND(!result);
}
else {
result = unicode_compare(left, right);
/* Convert the return value to a Boolean */
switch (op) {
case Py_EQ:
v = TEST_COND(result == 0);
break;
case Py_NE:
v = TEST_COND(result != 0);
break;
case Py_LE:
v = TEST_COND(result <= 0);
break;
@ -10389,11 +10409,9 @@ PyUnicode_RichCompare(PyObject *left, PyObject *right, int op)
PyErr_BadArgument();
return NULL;
}
Py_INCREF(v);
return v;
}
Py_RETURN_NOTIMPLEMENTED;
Py_INCREF(v);
return v;
}
int