Construct LocalVariableDeletion

Kay Hayen

2024-04-26 13:13

Performance Diagrams

Source Code with Construct    module_value2 = local_value

    if module_value2 is None:
        # construct_begin
        del local_value
        # construct_end

        another_local_value = module_value3

    module_value2 = module_value1

    local_value = module_value3
    return local_value


for x in itertools.repeat(None, 50000):
    calledRepeatedly()

print("OK.")

#     Python test originally created or extracted from other peoples work. The
#     parts from me are licensed as below. It is at least Free Software where
#     it's copied from other people. In these cases, that will normally be
#     indicated.
#
#     Licensed under the Apache License, Version 2.0 (the "License");
#     you may not use this file except in compliance with the License.
#     You may obtain a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#     Unless required by applicable law or agreed to in writing, software
#     distributed under the License is distributed on an "AS IS" BASIS,
#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#     See the License for the specific language governing permissions and
#     limitations under the License.

Source Code without Construct    module_value2 = local_value

    if module_value2 is None:
        # construct_begin



        another_local_value = module_value3

    module_value2 = module_value1

    local_value = module_value3
    return local_value


for x in itertools.repeat(None, 50000):
    calledRepeatedly()

print("OK.")

#     Python test originally created or extracted from other peoples work. The
#     parts from me are licensed as below. It is at least Free Software where
#     it's copied from other people. In these cases, that will normally be
#     indicated.
#
#     Licensed under the Apache License, Version 2.0 (the "License");
#     you may not use this file except in compliance with the License.
#     You may obtain a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#     Unless required by applicable law or agreed to in writing, software
#     distributed under the License is distributed on an "AS IS" BASIS,
#     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
#     See the License for the specific language governing permissions and
#     limitations under the License.

Context Diff of Source Code

	Construct			Baseline
	19			19
	20	module_value2 = local_value		20	module_value2 = local_value
	21			21
	22	if module_value2 is None:		22	if module_value2 is None:
	23	# construct_begin		23	# construct_begin
t	24	del local_value	t	24
	25	# construct_end		25
	26			26
	27	another_local_value = module_value3		27	another_local_value = module_value3
	28			28
	29	module_value2 = module_value1		29	module_value2 = module_value1
	30			30

Context Diff of Generated Code

	Construct			Baseline
	212	} else {		212	} else {
	213	goto branch_no_1;		213	goto branch_no_1;
	214	}		214	}
	215	}		215	}
	216	branch_yes_1:;		216	branch_yes_1:;
n	217	CHECK_OBJECT(var_local_value);	n
	218	Py_DECREF(var_local_value);
	219	var_local_value = NULL;
	220
	221	{		217	{
	222	PyObject *tmp_assign_source_3;		218	PyObject *tmp_assign_source_3;
	223	tmp_assign_source_3 = GET_STRING_DICT_VALUE(moduledict___main__, (Nuitka_StringObject *)mod_consts[2]);		219	tmp_assign_source_3 = GET_STRING_DICT_VALUE(moduledict___main__, (Nuitka_StringObject *)mod_consts[2]);
	224			220
	225	if (unlikely(tmp_assign_source_3 == NULL)) {		221	if (unlikely(tmp_assign_source_3 == NULL)) {
	279	type_description_1 = "oo";		275	type_description_1 = "oo";
	280	goto frame_exception_exit_1;		276	goto frame_exception_exit_1;
	281	}		277	}
	282	{		278	{
	283	PyObject *old = var_local_value;		279	PyObject *old = var_local_value;
n			n	280	assert(old != NULL);
	284	var_local_value = tmp_assign_source_5;		281	var_local_value = tmp_assign_source_5;
	285	Py_INCREF(var_local_value);		282	Py_INCREF(var_local_value);
t	286	Py_XDECREF(old);	t	283	Py_DECREF(old);
	287	}		284	}
	288			285
	289	}		286	}
	290			287
	291			288