Construct LocalVariableAccess

Kay Hayen

2013-08-15 08:15

Performance Diagrams

Source Code with Construct

module_value1 = 1000
module_value2 = None
module_value3 = None

def calledRepeatedly():
    # Force frame and eliminate forward propagation (currently).
    module_value1

    local_value = module_value1

    # Use writing to global variable as access method.
    global module_value2, module_value3

# construct_begin
    module_value2 = local_value
# construct_end

    module_value3 = local_value

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

print("OK.")

Source Code without Construct

module_value1 = 1000
module_value2 = None
module_value3 = None

def calledRepeatedly():
    # Force frame and eliminate forward propagation (currently).
    module_value1

    local_value = module_value1

    # Use writing to global variable as access method.
    global module_value2, module_value3

# construct_begin



    module_value3 = local_value

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

print("OK.")

Context Diff of Source Code

	Construct			Baseline
	29			29
	30	# Use writing to global variable as access method.		30	# Use writing to global variable as access method.
	31	global module_value2, module_value3		31	global module_value2, module_value3
	32			32
	33	# construct_begin		33	# construct_begin
t	34	module_value2 = local_value	t	34
	35	# construct_end		35
	36			36
	37	module_value3 = local_value		37	module_value3 = local_value
	38			38
	39	import itertools		39	import itertools
	40	for x in itertools.repeat(None, 50000):		40	for x in itertools.repeat(None, 50000):

Context Diff of Generated Code

	Construct			Baseline
	82	static PyCodeObject *codeobj_3a19bddae5f66391c237585565d94a79;		82	static PyCodeObject *codeobj_3a19bddae5f66391c237585565d94a79;
	83	/* For use in "MainProgram.c". */		83	/* For use in "MainProgram.c". */
	84	PyCodeObject *codeobj_main = NULL;		84	PyCodeObject *codeobj_main = NULL;
	85			85
	86	static void createModuleCodeObjects(void) {		86	static void createModuleCodeObjects(void) {
n	87	module_filename_obj = mod_consts[4]; CHECK_OBJECT(module_filename_obj);	n	87	module_filename_obj = mod_consts[3]; CHECK_OBJECT(module_filename_obj);
	88	codeobj_f5370255da3058ba2bb14ba281609ade = MAKE_CODEOBJECT(module_filename_obj, 1, CO_NOFREE, mod_consts[17], NULL, NULL, 0, 0, 0);		88	codeobj_f5370255da3058ba2bb14ba281609ade = MAKE_CODEOBJECT(module_filename_obj, 1, CO_NOFREE, mod_consts[17], NULL, NULL, 0, 0, 0);
	89	codeobj_3a19bddae5f66391c237585565d94a79 = MAKE_CODEOBJECT(module_filename_obj, 24, CO_OPTIMIZED \| CO_NEWLOCALS \| CO_NOFREE, mod_consts[9], mod_consts[18], NULL, 0, 0, 0);		89	codeobj_3a19bddae5f66391c237585565d94a79 = MAKE_CODEOBJECT(module_filename_obj, 24, CO_OPTIMIZED \| CO_NEWLOCALS \| CO_NOFREE, mod_consts[9], mod_consts[18], NULL, 0, 0, 0);
	90	}		90	}
	91			91
	92	// The module function declarations.		92	// The module function declarations.
	239	{		239	{
	240	PyObject *tmp_assign_source_2;		240	PyObject *tmp_assign_source_2;
	241	CHECK_OBJECT(var_local_value);		241	CHECK_OBJECT(var_local_value);
	242	tmp_assign_source_2 = var_local_value;		242	tmp_assign_source_2 = var_local_value;
	243	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[1], tmp_assign_source_2);		243	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[1], tmp_assign_source_2);
n	244	}	n
	245	{
	246	PyObject *tmp_assign_source_3;
	247	CHECK_OBJECT(var_local_value);
	248	tmp_assign_source_3 = var_local_value;
	249	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[2], tmp_assign_source_3);
	250	}		244	}
	251	tmp_return_value = Py_None;		245	tmp_return_value = Py_None;
	252	Py_INCREF(tmp_return_value);		246	Py_INCREF(tmp_return_value);
	253	goto try_return_handler_1;		247	goto try_return_handler_1;
	254	NUITKA_CANNOT_GET_HERE("tried codes exits in all cases");		248	NUITKA_CANNOT_GET_HERE("tried codes exits in all cases");
	687			681
	688	// Module code.		682	// Module code.
	689	{		683	{
	690	PyObject *tmp_assign_source_1;		684	PyObject *tmp_assign_source_1;
	691	tmp_assign_source_1 = Py_None;		685	tmp_assign_source_1 = Py_None;
n	692	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[3], tmp_assign_source_1);	n	686	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[2], tmp_assign_source_1);
	693	}		687	}
	694	{		688	{
	695	PyObject *tmp_assign_source_2;		689	PyObject *tmp_assign_source_2;
n	696	tmp_assign_source_2 = mod_consts[4];	n	690	tmp_assign_source_2 = mod_consts[3];
	697	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[5], tmp_assign_source_2);		691	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[4], tmp_assign_source_2);
	698	}		692	}
	699	{		693	{
	700	PyObject *tmp_assign_source_3;		694	PyObject *tmp_assign_source_3;
	701	tmp_assign_source_3 = Py_None;		695	tmp_assign_source_3 = Py_None;
n	702	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[6], tmp_assign_source_3);	n	696	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[5], tmp_assign_source_3);
	703	}		697	}
	704	{		698	{
	705	PyObject *tmp_assign_source_4;		699	PyObject *tmp_assign_source_4;
	706	tmp_assign_source_4 = PyDict_New();		700	tmp_assign_source_4 = PyDict_New();
n	707	UPDATE_STRING_DICT1(moduledict___main__, (Nuitka_StringObject *)mod_consts[7], tmp_assign_source_4);	n	701	UPDATE_STRING_DICT1(moduledict___main__, (Nuitka_StringObject *)mod_consts[6], tmp_assign_source_4);
	708	}		702	}
	709	{		703	{
	710	PyObject *tmp_assign_source_5;		704	PyObject *tmp_assign_source_5;
n	711	tmp_assign_source_5 = mod_consts[8];	n	705	tmp_assign_source_5 = mod_consts[7];
	712	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[0], tmp_assign_source_5);		706	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[0], tmp_assign_source_5);
	713	}		707	}
	714	{		708	{
	715	PyObject *tmp_assign_source_6;		709	PyObject *tmp_assign_source_6;
	716	tmp_assign_source_6 = Py_None;		710	tmp_assign_source_6 = Py_None;
n	717	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[1], tmp_assign_source_6);	n	711	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[8], tmp_assign_source_6);
	718	}		712	}
	719	{		713	{
	720	PyObject *tmp_assign_source_7;		714	PyObject *tmp_assign_source_7;
	721	tmp_assign_source_7 = Py_None;		715	tmp_assign_source_7 = Py_None;
t	722	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[2], tmp_assign_source_7);	t	716	UPDATE_STRING_DICT0(moduledict___main__, (Nuitka_StringObject *)mod_consts[1], tmp_assign_source_7);
	723	}		717	}
	724	{		718	{
	725	PyObject *tmp_assign_source_8;		719	PyObject *tmp_assign_source_8;
	726			720
	727			721