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
	213	goto frame_exception_exit_1;		213	goto frame_exception_exit_1;
	214	}		214	}
	215	assert(var_x == NULL);		215	assert(var_x == NULL);
	216	var_x = tmp_assign_source_3;		216	var_x = tmp_assign_source_3;
	217	}		217	}
n	218	{	n
	219	PyObject *tmp_value_name_2;
	220	PyObject *tmp_next_value_1;
	221	CHECK_OBJECT(var_gen);
	222	tmp_value_name_2 = var_gen;
	223	tmp_next_value_1 = ITERATOR_NEXT(tmp_value_name_2);
	224	if (tmp_next_value_1 == NULL) {
	225	if (!ERROR_OCCURRED()) {
	226	exception_type = PyExc_StopIteration;
	227	Py_INCREF(exception_type);
	228	exception_value = NULL;
	229	exception_tb = NULL;
	230	} else {
	231	FETCH_ERROR_OCCURRED(&exception_type, &exception_value, &exception_tb);
	232	}
	233
	234
	235	type_description_1 = "ooo";
	236	exception_lineno = 34;
	237	goto frame_exception_exit_1;
	238	}
	239	Py_DECREF(tmp_next_value_1);
	240	}
	241			218
	242	#if 0		219	#if 0
	243	RESTORE_FRAME_EXCEPTION(frame_e7fe790c5f2c65a79045d742bc73b55a);		220	RESTORE_FRAME_EXCEPTION(frame_e7fe790c5f2c65a79045d742bc73b55a);
	244	#endif		221	#endif
	245			222
	319	exception_tb = NULL;		296	exception_tb = NULL;
	320	exception_lineno = 0;		297	exception_lineno = 0;
	321			298
	322	Py_XDECREF(var_gen);		299	Py_XDECREF(var_gen);
	323	var_gen = NULL;		300	var_gen = NULL;
t	324		t
	325	Py_XDECREF(var_x);
	326	var_x = NULL;
	327			301
	328	CHECK_OBJECT((PyObject *)var_generator);		302	CHECK_OBJECT((PyObject *)var_generator);
	329	Py_DECREF(var_generator);		303	Py_DECREF(var_generator);
	330	var_generator = NULL;		304	var_generator = NULL;
	331			305