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
	221	goto frame_exception_exit_1;		221	goto frame_exception_exit_1;
	222	}		222	}
	223	assert( var_x == NULL );		223	assert( var_x == NULL );
	224	var_x = tmp_assign_source_3;		224	var_x = tmp_assign_source_3;
	225	}		225	}
n	226	{	n
	227	PyObject *tmp_value_name_2;
	228	PyObject *tmp_next_value_1;
	229	CHECK_OBJECT( var_gen );
	230	tmp_value_name_2 = var_gen;
	231	tmp_next_value_1 = ITERATOR_NEXT( tmp_value_name_2 );
	232	if ( tmp_next_value_1 == NULL )
	233	{
	234	if ( !ERROR_OCCURRED() )
	235	{
	236	exception_type = PyExc_StopIteration;
	237	Py_INCREF( exception_type );
	238	exception_value = NULL;
	239	exception_tb = NULL;
	240	}
	241	else
	242	{
	243	FETCH_ERROR_OCCURRED( &exception_type, &exception_value, &exception_tb );
	244	}
	245
	246
	247	type_description_1 = "ooo";
	248	exception_lineno = 34;
	249	goto frame_exception_exit_1;
	250	}
	251	Py_DECREF( tmp_next_value_1 );
	252	}
	253			226
	254	#if 0		227	#if 0
	255	RESTORE_FRAME_EXCEPTION( frame_9d2dcf7b634e2a4c630b16b4160770e4 );		228	RESTORE_FRAME_EXCEPTION( frame_9d2dcf7b634e2a4c630b16b4160770e4 );
	256	#endif		229	#endif
	257			230
	334	exception_tb = NULL;		307	exception_tb = NULL;
	335	exception_lineno = 0;		308	exception_lineno = 0;
	336			309
	337	Py_XDECREF( var_gen );		310	Py_XDECREF( var_gen );
	338	var_gen = NULL;		311	var_gen = NULL;
t	339		t
	340	Py_XDECREF( var_x );
	341	var_x = NULL;
	342			312
	343	CHECK_OBJECT( (PyObject *)var_generator );		313	CHECK_OBJECT( (PyObject *)var_generator );
	344	Py_DECREF( var_generator );		314	Py_DECREF( var_generator );
	345	var_generator = NULL;		315	var_generator = NULL;
	346			316