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
	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
	226	}		226	}
n	227	{	n
	228	PyObject *tmp_value_name_2;
	229	PyObject *tmp_next_value_1;
	230	CHECK_OBJECT( var_gen );
	231	tmp_value_name_2 = var_gen;
	232	tmp_next_value_1 = ITERATOR_NEXT( tmp_value_name_2 );
	233	if ( tmp_next_value_1 == NULL )
	234	{
	235	if ( !ERROR_OCCURRED() )
	236	{
	237	exception_type = PyExc_StopIteration;
	238	Py_INCREF( exception_type );
	239	exception_value = NULL;
	240	exception_tb = NULL;
	241	}
	242	else
	243	{
	244	FETCH_ERROR_OCCURRED( &exception_type, &exception_value, &exception_tb );
	245	}
	246
	247
	248	type_description_1 = "ooo";
	249	exception_lineno = 34;
	250	goto frame_exception_exit_1;
	251	}
	252	Py_DECREF( tmp_next_value_1 );
	253	}
	254			227
	255	#if 0		228	#if 0
	256	RESTORE_FRAME_EXCEPTION( frame_ad0099fa888b14525477353d220c5857 );		229	RESTORE_FRAME_EXCEPTION( frame_ad0099fa888b14525477353d220c5857 );
	257	#endif		230	#endif
	258			231
	346	exception_lineno = 0;		319	exception_lineno = 0;
	347			320
	348	{		321	{
	349	Py_XDECREF( var_gen );		322	Py_XDECREF( var_gen );
	350	var_gen = NULL;		323	var_gen = NULL;
t	351		t
	352	}
	353	{
	354	Py_XDECREF( var_x );
	355	var_x = NULL;
	356			324
	357	}		325	}
	358	{		326	{
	359	CHECK_OBJECT( (PyObject *)var_generator );		327	CHECK_OBJECT( (PyObject *)var_generator );
	360	Py_DECREF( var_generator );		328	Py_DECREF( var_generator );