Construct GeneratorExpressionUsage

Kay Hayen

2013-08-15 08:15

Performance Diagrams

Source Code with Construct

not_all = [1,1,1,1,1,1,1,1,0,1]

def calledRepeatedly():
    # We measure making a generator iterator step or not.
    gen = (x for x in not_all)

    # make sure it is started.
    x = next(gen)

    # This should abort.
# construct_begin
    all(gen)
# construct_end

    # make sure it is still running.
    y = next(gen)

    return x, y

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

print("OK.")

Source Code without Construct

not_all = [1,1,1,1,1,1,1,1,0,1]

def calledRepeatedly():
    # We measure making a generator iterator step or not.
    gen = (x for x in not_all)

    # make sure it is started.
    x = next(gen)

    # This should abort.
# construct_begin



    # make sure it is still running.
    y = next(gen)

    return x, y

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

print("OK.")

Context Diff of Source Code

	Construct			Baseline
	27	# make sure it is started.		27	# make sure it is started.
	28	x = next(gen)		28	x = next(gen)
	29			29
	30	# This should abort.		30	# This should abort.
	31	# construct_begin		31	# construct_begin
t	32	all(gen)	t	32
	33	# construct_end		33
	34			34
	35	# make sure it is still running.		35	# make sure it is still running.
	36	y = next(gen)		36	y = next(gen)
	37			37
	38	return x, y		38	return x, y

Context Diff of Generated Code

	Construct			Baseline
	114	NUITKA_MAY_BE_UNUSED char const *type_description_1 = NULL;		114	NUITKA_MAY_BE_UNUSED char const *type_description_1 = NULL;
	115	PyObject *exception_type = NULL;		115	PyObject *exception_type = NULL;
	116	PyObject *exception_value = NULL;		116	PyObject *exception_value = NULL;
	117	PyTracebackObject *exception_tb = NULL;		117	PyTracebackObject *exception_tb = NULL;
	118	NUITKA_MAY_BE_UNUSED int exception_lineno = 0;		118	NUITKA_MAY_BE_UNUSED int exception_lineno = 0;
n	119	NUITKA_MAY_BE_UNUSED nuitka_void tmp_unused;	n
	120	static struct Nuitka_FrameObject *cache_frame_8cd2fdcc4a9430781af29fa52936c480 = NULL;		119	static struct Nuitka_FrameObject *cache_frame_8cd2fdcc4a9430781af29fa52936c480 = NULL;
	121	PyObject *tmp_return_value = NULL;		120	PyObject *tmp_return_value = NULL;
	122	PyObject *exception_keeper_type_1;		121	PyObject *exception_keeper_type_1;
	123	PyObject *exception_keeper_value_1;		122	PyObject *exception_keeper_value_1;
	124	PyTracebackObject *exception_keeper_tb_1;		123	PyTracebackObject *exception_keeper_tb_1;
	234	exception_lineno = 28;		233	exception_lineno = 28;
	235	goto frame_exception_exit_1;		234	goto frame_exception_exit_1;
	236	}		235	}
	237	assert(var_x == NULL);		236	assert(var_x == NULL);
	238	var_x = tmp_assign_source_3;		237	var_x = tmp_assign_source_3;
t	239	}	t
	240	{
	241	PyObject *tmp_all_arg_1;
	242	PyObject *tmp_capi_result_1;
	243	CHECK_OBJECT(var_gen);
	244	tmp_all_arg_1 = var_gen;
	245	tmp_capi_result_1 = BUILTIN_ALL(tmp_all_arg_1);
	246	if (tmp_capi_result_1 == NULL) {
	247	assert(ERROR_OCCURRED());
	248
	249	FETCH_ERROR_OCCURRED(&exception_type, &exception_value, &exception_tb);
	250
	251
	252	exception_lineno = 32;
	253	type_description_1 = "ooo";
	254	goto frame_exception_exit_1;
	255	}
	256	Py_DECREF(tmp_capi_result_1);
	257	}		238	}
	258	{		239	{
	259	PyObject *tmp_assign_source_4;		240	PyObject *tmp_assign_source_4;
	260	PyObject *tmp_value_value_2;		241	PyObject *tmp_value_value_2;
	261	CHECK_OBJECT(var_gen);		242	CHECK_OBJECT(var_gen);