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Issue #14744: Use the new _PyUnicodeWriter internal API to speed up str%args and str.format(args)

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* Formatting string, int, float and complex use the _PyUnicodeWriter API. It
   avoids a temporary buffer in most cases.
 * Add _PyUnicodeWriter_WriteStr() to restore the PyAccu optimization: just
   keep a reference to the string if the output is only composed of one string
 * Disable overallocation when formatting the last argument of str%args and
   str.format(args)
 * Overallocation allocates at least 100 characters: add min_length attribute
   to the _PyUnicodeWriter structure
 * Add new private functions: _PyUnicode_FastCopyCharacters(),
   _PyUnicode_FastFill() and _PyUnicode_FromASCII()

The speed up is around 20% in average.
This commit is contained in:
Victor Stinner 2012-05-29 12:57:52 +02:00
parent a1b0c9fc4d
commit d3f0882dfb
12 changed files with 878 additions and 437 deletions
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18
Include/longobject.h
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@ -151,14 +151,22 @@ PyAPI_FUNC(int) _PyLong_AsByteArray(PyLongObject* v,
/* _PyLong_Format: Convert the long to a string object with given base,
appending a base prefix of 0[box] if base is 2, 8 or 16. */
PyAPI_FUNC(PyObject *) _PyLong_Format(PyObject *aa, int base);
PyAPI_FUNC(PyObject *) _PyLong_Format(PyObject *obj, int base);
PyAPI_FUNC(int) _PyLong_FormatWriter(
_PyUnicodeWriter *writer,
PyObject *obj,
int base,
int alternate);
/* Format the object based on the format_spec, as defined in PEP 3101
(Advanced String Formatting). */
PyAPI_FUNC(PyObject *) _PyLong_FormatAdvanced(PyObject *obj,
PyObject *format_spec,
Py_ssize_t start,
Py_ssize_t end);
PyAPI_FUNC(int) _PyLong_FormatAdvancedWriter(
_PyUnicodeWriter *writer,
PyObject *obj,
PyObject *format_spec,
Py_ssize_t start,
Py_ssize_t end);
#endif /* Py_LIMITED_API */
/* These aren't really part of the long object, but they're handy. The