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