Commit 72bc351f authored by Stefan Behnel's avatar Stefan Behnel

faster unpacking of optional arguments (10-20%): finding interned strings in a...

faster unpacking of optional arguments (10-20%): finding interned strings in a dict is faster than iterating
parent b3080677
......@@ -2192,6 +2192,7 @@ class DefNode(FuncDefNode):
if arg.type is not PyrexTypes.py_object_type:
default_value = "(PyObject*)"+default_value
default_args.append((i, default_value))
code.putln("Py_ssize_t kw_args = PyDict_Size(%s);" %
Naming.kwds_cname)
# it looks funny to separate the init-to-0 from setting the
......@@ -2216,11 +2217,14 @@ class DefNode(FuncDefNode):
code.putln('}')
# now fill up the required arguments with values from the kw dict
if self.num_required_args:
if self.num_required_args or max_positional_args > 0:
last_required_arg = -1
for i, arg in enumerate(all_args):
if not arg.default:
last_required_arg = i
if last_required_arg < max_positional_args:
last_required_arg = max_positional_args-1
num_required_args = self.num_required_args
if max_positional_args > 0:
code.putln('switch (PyTuple_GET_SIZE(%s)) {' % Naming.args_cname)
for i, arg in enumerate(all_args[:last_required_arg+1]):
......@@ -2230,8 +2234,16 @@ class DefNode(FuncDefNode):
else:
code.putln('case %2d:' % i)
if arg.default:
# handled in ParseOptionalKeywords() below
if arg.kw_only:
# handled separately below
continue
code.putln('if (kw_args > %d) {' % num_required_args)
code.putln('PyObject* value = PyDict_GetItem(%s, %s);' % (
Naming.kwds_cname, arg.name_entry.pystring_cname))
code.putln('if (unlikely(value)) { values[%d] = value; kw_args--; }' % i);
code.putln('}')
else:
num_required_args -= 1
code.putln('values[%d] = PyDict_GetItem(%s, %s);' % (
i, Naming.kwds_cname, arg.name_entry.pystring_cname))
code.putln('if (likely(values[%d])) kw_args--;' % i);
......@@ -2259,8 +2271,31 @@ class DefNode(FuncDefNode):
if max_positional_args > 0:
code.putln('}')
if kw_only_args and not self.starstar_arg:
# unpack optional keyword-only arguments
# checking for interned strings in a dict is faster than iterating
# but it's too likely that we must iterate if we expect **kwargs
optional_args = []
for i, arg in enumerate(all_args[max_positional_args:]):
if not arg.kw_only or not arg.default:
continue
optional_args.append((i+max_positional_args, arg))
if optional_args:
# this mimics an unrolled loop so that we can "break" out of it
code.putln('while (kw_args > 0) {')
code.putln('PyObject* value;')
for i, arg in optional_args:
code.putln(
'value = PyDict_GetItem(%s, %s);' % (
Naming.kwds_cname, arg.name_entry.pystring_cname))
code.putln(
'if (value) { values[%d] = value; if (!(--kw_args)) break; }' % i)
code.putln('break;')
code.putln('}')
code.putln('if (unlikely(kw_args > 0)) {')
# non-positional/-required kw args left in dict: default args, **kwargs or error
# non-positional/-required kw args left in dict: default args,
# kw-only args, **kwargs or error
if max_positional_args == 0:
pos_arg_count = "0"
elif self.star_arg:
......
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