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Issue #17615: Comparing two Unicode strings now uses wmemcmp() when possible

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wmemcmp() is twice faster than a dummy loop (342 usec vs 744 usec) on Fedora
18/x86_64, GCC 4.7.2.
This commit is contained in:
Victor Stinner 2013-04-08 22:43:44 +02:00
parent 9fc5981ea2
commit cd777eaf53
5 changed files with 30 additions and 5 deletions
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22
Objects/unicodeobject.c
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@ -10304,8 +10304,19 @@ unicode_compare(PyObject *str1, PyObject *str2)
COMPARE(Py_UCS2, Py_UCS1);
break;
case PyUnicode_2BYTE_KIND:
{
#if defined(HAVE_WMEMCMP) && SIZEOF_WCHAR_T == 2
int cmp = wmemcmp((wchar_t *)data1, (wchar_t *)data2, len);
/* normalize result of wmemcmp() into the range [-1; 1] */
if (cmp < 0)
return -1;
if (cmp > 0)
return 1;
#else
COMPARE(Py_UCS2, Py_UCS2);
#endif
break;
}
case PyUnicode_4BYTE_KIND:
COMPARE(Py_UCS2, Py_UCS4);
break;
@ -10324,8 +10335,19 @@ unicode_compare(PyObject *str1, PyObject *str2)
COMPARE(Py_UCS4, Py_UCS2);
break;
case PyUnicode_4BYTE_KIND:
{
#if defined(HAVE_WMEMCMP) && SIZEOF_WCHAR_T == 4
int cmp = wmemcmp((wchar_t *)data1, (wchar_t *)data2, len);
/* normalize result of wmemcmp() into the range [-1; 1] */
if (cmp < 0)
return -1;
if (cmp > 0)
return 1;
#else
COMPARE(Py_UCS4, Py_UCS4);
#endif
break;
}
default:
assert(0);
}