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
	220	goto frame_exception_exit_1;		220	goto frame_exception_exit_1;
	221	}		221	}
	222	assert( var_x == NULL );		222	assert( var_x == NULL );
	223	var_x = tmp_assign_source_3;		223	var_x = tmp_assign_source_3;
	224	}		224	}
n	225	{	n
	226	PyObject *tmp_value_name_2;
	227	PyObject *tmp_next_value_1;
	228	CHECK_OBJECT( var_gen );
	229	tmp_value_name_2 = var_gen;
	230	tmp_next_value_1 = ITERATOR_NEXT( tmp_value_name_2 );
	231	if ( tmp_next_value_1 == NULL )
	232	{
	233	if ( !ERROR_OCCURRED() )
	234	{
	235	exception_type = PyExc_StopIteration;
	236	Py_INCREF( exception_type );
	237	exception_value = NULL;
	238	exception_tb = NULL;
	239	}
	240	else
	241	{
	242	FETCH_ERROR_OCCURRED( &exception_type, &exception_value, &exception_tb );
	243	}
	244
	245
	246	type_description_1 = "ooo";
	247	exception_lineno = 34;
	248	goto frame_exception_exit_1;
	249	}
	250	Py_DECREF( tmp_next_value_1 );
	251	}
	252			225
	253	#if 0		226	#if 0
	254	RESTORE_FRAME_EXCEPTION( frame_cabd374a2ca15385f7c7ee29bcf1f91d );		227	RESTORE_FRAME_EXCEPTION( frame_cabd374a2ca15385f7c7ee29bcf1f91d );
	255	#endif		228	#endif
	256			229
	333	exception_tb = NULL;		306	exception_tb = NULL;
	334	exception_lineno = 0;		307	exception_lineno = 0;
	335			308
	336	Py_XDECREF( var_gen );		309	Py_XDECREF( var_gen );
	337	var_gen = NULL;		310	var_gen = NULL;
t	338		t
	339	Py_XDECREF( var_x );
	340	var_x = NULL;
	341			311
	342	CHECK_OBJECT( (PyObject *)var_generator );		312	CHECK_OBJECT( (PyObject *)var_generator );
	343	Py_DECREF( var_generator );		313	Py_DECREF( var_generator );
	344	var_generator = NULL;		314	var_generator = NULL;
	345			315