Construct GeneratorExpressionUsage

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
	275	}		275	}
	276	assert(var_x == NULL);		276	assert(var_x == NULL);
	277	var_x = tmp_assign_source_3;		277	var_x = tmp_assign_source_3;
	278	}		278	}
	279	{		279	{
t	280	PyObject *tmp_all_arg_1;	t
	281	PyObject *tmp_capi_result_1;
	282	CHECK_OBJECT(var_gen);
	283	tmp_all_arg_1 = var_gen;
	284	tmp_capi_result_1 = BUILTIN_ALL(tmp_all_arg_1);
	285	if (tmp_capi_result_1 == NULL) {
	286	assert(ERROR_OCCURRED());
	287
	288	FETCH_ERROR_OCCURRED(&exception_type, &exception_value, &exception_tb);
	289
	290
	291	exception_lineno = 32;
	292	type_description_1 = "ooo";
	293	goto frame_exception_exit_1;
	294	}
	295	Py_DECREF(tmp_capi_result_1);
	296	}
	297	{
	298	PyObject *tmp_assign_source_4;		280	PyObject *tmp_assign_source_4;
	299	PyObject *tmp_value_name_2;		281	PyObject *tmp_value_name_2;
	300	CHECK_OBJECT(var_gen);		282	CHECK_OBJECT(var_gen);
	301	tmp_value_name_2 = var_gen;		283	tmp_value_name_2 = var_gen;
	302	tmp_assign_source_4 = ITERATOR_NEXT(tmp_value_name_2);		284	tmp_assign_source_4 = ITERATOR_NEXT(tmp_value_name_2);