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Optimize unicode_subscript() for step != 1 and ascii strings

This commit is contained in:
Victor Stinner 2011-10-13 01:17:06 +02:00
parent 127226ba69
commit 55c991197b
1 changed files with 12 additions and 8 deletions
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20
Objects/unicodeobject.c
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@ -12614,18 +12614,22 @@ unicode_subscript(PyUnicodeObject* self, PyObject* item)
start, start + slicelength);
}
/* General case */
max_char = 0;
src_kind = PyUnicode_KIND(self);
kind_limit = kind_maxchar_limit(src_kind);
src_data = PyUnicode_DATA(self);
for (cur = start, i = 0; i < slicelength; cur += step, i++) {
ch = PyUnicode_READ(src_kind, src_data, cur);
if (ch > max_char) {
max_char = ch;
if (max_char >= kind_limit)
break;
if (!PyUnicode_IS_ASCII(self)) {
kind_limit = kind_maxchar_limit(src_kind);
max_char = 0;
for (cur = start, i = 0; i < slicelength; cur += step, i++) {
ch = PyUnicode_READ(src_kind, src_data, cur);
if (ch > max_char) {
max_char = ch;
if (max_char >= kind_limit)
break;
}
}
}
else
max_char = 127;
result = PyUnicode_New(slicelength, max_char);
if (result == NULL)
return NULL;