Construct GeneratorUsage

Performance Diagrams

Source Code with Construct

def calledRepeatedly():
    # We measure making a generator iterator step or not.
    def generator():
        yield 1
        yield 2
        yield 3

    gen = generator()

    x = next(gen)
# construct_begin
    next(gen)
# construct_end

    return x

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

print("OK.")

Source Code without Construct

def calledRepeatedly():
    # We measure making a generator iterator step or not.
    def generator():
        yield 1
        yield 2
        yield 3

    gen = generator()

    x = next(gen)
# construct_begin



    return x

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

print("OK.")

Context Diff of Source Code

	Construct			Baseline
	29			29
	30	gen = generator()		30	gen = generator()
	31			31
	32	x = next(gen)		32	x = next(gen)
	33	# construct_begin		33	# construct_begin
t	34	next(gen)	t	34
	35	# construct_end		35
	36			36
	37	return x		37	return x
	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
	216	goto frame_exception_exit_1;		216	goto frame_exception_exit_1;
	217	}		217	}
	218	assert(var_x == NULL);		218	assert(var_x == NULL);
	219	var_x = tmp_assign_source_3;		219	var_x = tmp_assign_source_3;
	220	}		220	}
n	221	{	n
	222	PyObject *tmp_value_name_2;
	223	PyObject *tmp_next_value_1;
	224	CHECK_OBJECT(var_gen);
	225	tmp_value_name_2 = var_gen;
	226	tmp_next_value_1 = ITERATOR_NEXT( tmp_value_name_2 );
	227	if (tmp_next_value_1 == NULL)
	228	{
	229	if (!ERROR_OCCURRED()) {
	230	exception_type = PyExc_StopIteration;
	231	Py_INCREF(exception_type);
	232	exception_value = NULL;
	233	exception_tb = NULL;
	234	} else {
	235	FETCH_ERROR_OCCURRED(&exception_type, &exception_value, &exception_tb);
	236	}
	237
	238
	239	type_description_1 = "ooo";
	240	exception_lineno = 34;
	241	goto frame_exception_exit_1;
	242	}
	243	Py_DECREF(tmp_next_value_1);
	244	}
	245			221
	246	#if 0		222	#if 0
	247	RESTORE_FRAME_EXCEPTION(frame_fef5ffae43e3b108c03d211bb773ac8a);		223	RESTORE_FRAME_EXCEPTION(frame_fef5ffae43e3b108c03d211bb773ac8a);
	248	#endif		224	#endif
	249			225
	323	exception_tb = NULL;		299	exception_tb = NULL;
	324	exception_lineno = 0;		300	exception_lineno = 0;
	325			301
	326	Py_XDECREF(var_gen);		302	Py_XDECREF(var_gen);
	327	var_gen = NULL;		303	var_gen = NULL;
t	328		t
	329	Py_XDECREF(var_x);
	330	var_x = NULL;
	331			304
	332	CHECK_OBJECT((PyObject *)var_generator);		305	CHECK_OBJECT((PyObject *)var_generator);
	333	Py_DECREF(var_generator);		306	Py_DECREF(var_generator);
	334	var_generator = NULL;		307	var_generator = NULL;
	335			308