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Issue #17615: On Windows (VS2010), Performances of wmemcmp() to compare Unicode

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strings are not convincing. For UCS2 (16-bit wchar_t type), use a dummy loop
instead of wmemcmp(). The dummy loop is as fast, or a little bit faster.

wchar_t is only 16-bit long on Windows. wmemcmp() is still used for 32-bit
wchar_t.
This commit is contained in:
Victor Stinner 2013-04-09 23:53:26 +02:00
parent 2a4df127c7
commit 247109e74d
2 changed files with 0 additions and 12 deletions
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9
Objects/unicodeobject.c
View file

@ -10375,16 +10375,7 @@ unicode_compare(PyObject *str1, PyObject *str2)
break; break;
case PyUnicode_2BYTE_KIND: 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); COMPARE(Py_UCS2, Py_UCS2);
#endif
break; break;
} }
case PyUnicode_4BYTE_KIND: case PyUnicode_4BYTE_KIND:

3
PC/pyconfig.h
View file

@ -645,9 +645,6 @@ Py_NO_ENABLE_SHARED to find out. Also support MS_NO_COREDLL for b/w compat */
#define HAVE_WCSXFRM 1 #define HAVE_WCSXFRM 1
#endif #endif
/* Define to 1 if you have the `wmemcmp' function. */
#define HAVE_WMEMCMP 1
/* Define if the zlib library has inflateCopy */ /* Define if the zlib library has inflateCopy */
#define HAVE_ZLIB_COPY 1 #define HAVE_ZLIB_COPY 1