8000 gh-91146: Reduce allocation size of list from str.split()/rsplit() by corona10 · Pull Request #95473 · python/cpython · GitHub
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gh-91146: Reduce allocation size of list from str.split()/rsplit() #95473

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Merged
merged 2 commits into from
Jul 31, 2022
Merged

gh-91146: Reduce allocation size of list from str.split()/rsplit() #95473

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5b66b83
gh-91146: Reduce allocation size of list from str.split()
corona10 Jul 30, 2022
ba39640
Apply to str.rsplit too
corona10 Jul 31, 2022
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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Core and Builtins/2022-07-31-03-22-58.gh-issue-91146.Y2Hziy.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Reduce allocation size of :class:`list` from :meth:`str.split`
and :meth:`str.rsplit`. Patch by Dong-hee Na.
39 changes: 20 additions & 19 deletions Objects/unicodeobject.c
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Original file line number Diff line number Diff line change
Expand Up @@ -9696,40 +9696,40 @@ split(PyObject *self,
const void *buf1, *buf2;
Py_ssize_t len1, len2;
PyObject* out;

if (maxcount < 0)
maxcount = PY_SSIZE_T_MAX;
len1 = PyUnicode_GET_LENGTH(self);
kind1 = PyUnicode_KIND(self);
if (maxcount < 0) {
maxcount = len1;
}

if (substring == NULL)
switch (PyUnicode_KIND(self)) {
switch (kind1) {
case PyUnicode_1BYTE_KIND:
if (PyUnicode_IS_ASCII(self))
return asciilib_split_whitespace(
self, PyUnicode_1BYTE_DATA(self),
PyUnicode_GET_LENGTH(self), maxcount
len1, maxcount
);
else
return ucs1lib_split_whitespace(
self, PyUnicode_1BYTE_DATA(self),
PyUnicode_GET_LENGTH(self), maxcount
len1, maxcount
);
case PyUnicode_2BYTE_KIND:
return ucs2lib_split_whitespace(
self, PyUnicode_2BYTE_DATA(self),
PyUnicode_GET_LENGTH(self), maxcount
len1, maxcount
);
case PyUnicode_4BYTE_KIND:
return ucs4lib_split_whitespace(
self, PyUnicode_4BYTE_DATA(self),
PyUnicode_GET_LENGTH(self), maxcount
len1, maxcount
);
default:
Py_UNREACHABLE();
}

kind1 = PyUnicode_KIND(self);
kind2 = PyUnicode_KIND(substring);
len1 = PyUnicode_GET_LENGTH(self);
len2 = PyUnicode_GET_LENGTH(substring);
if (kind1 < kind2 || len1 < len2) {
out = PyList_New(1);
Expand Down Expand Up @@ -9783,39 +9783,40 @@ rsplit(PyObject *self,
Py_ssize_t len1, len2;
PyObject* out;

if (maxcount < 0)
maxcount = PY_SSIZE_T_MAX;
len1 = PyUnicode_GET_LENGTH(self);
kind1 = PyUnicode_KIND(self);
if (maxcount < 0) {
maxcount = len1;
}

if (substring == NULL)
switch (PyUnicode_KIND(self)) {
switch (kind1) {
case PyUnicode_1BYTE_KIND:
if (PyUnicode_IS_ASCII(self))
return asciilib_rsplit_whitespace(
self, PyUnicode_1BYTE_DATA(self),
PyUnicode_GET_LENGTH(self), maxcount
len1, maxcount
);
else
return ucs1lib_rsplit_whitespace(
self, PyUnicode_1BYTE_DATA(self),
PyUnicode_GET_LENGTH(self), maxcount
len1, maxcount
);
case PyUnicode_2BYTE_KIND:
return ucs2lib_rsplit_whitespace(
self, PyUnicode_2BYTE_DATA(self),
PyUnicode_GET_LENGTH(self), maxcount
len1, maxcount
);
case PyUnicode_4BYTE_KIND:
return ucs4lib_rsplit_whitespace(
self, PyUnicode_4BYTE_DATA(self),
PyUnicode_GET_LENGTH(self), maxcount
len1, maxcount
);
default:
Py_UNREACHABLE();
}

kind1 = PyUnicode_KIND(self);
kind2 = PyUnicode_KIND(substring);
len1 = PyUnicode_GET_LENGTH(self);
len2 = PyUnicode_GET_LENGTH(substring);
if (kind1 < kind2 || len1 < len2) {
out = PyList_New(1);
Expand Down
0