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	if ( var_gen == NULL )
	231	{
	232
	233	exception_type = PyExc_UnboundLocalError;
	234	Py_INCREF( exception_type );
	235	exception_value = PyUnicode_FromFormat( "local variable '%s' referenced before assignment", "gen" );
	236	exception_tb = NULL;
	237	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );
	238	CHAIN_EXCEPTION( exception_value );
	239
	240	exception_lineno = 34;
	241	type_description_1 = "ooo";
	242	goto frame_exception_exit_1;
	243	}
	244
	245	tmp_value_name_2 = var_gen;
	246	tmp_next_value_1 = ITERATOR_NEXT( tmp_value_name_2 );
	247	if ( tmp_next_value_1 == NULL )
	248	{
	249	if ( !ERROR_OCCURRED() )
	250	{
	251	exception_type = PyExc_StopIteration;
	252	Py_INCREF( exception_type );
	253	exception_value = NULL;
	254	exception_tb = NULL;
	255	}
	256	else
	257	{
	258	FETCH_ERROR_OCCURRED( &exception_type, &exception_value, &exception_tb );
	259	}
	260
	261
	262	type_description_1 = "ooo";
	263	exception_lineno = 34;
	264	goto frame_exception_exit_1;
	265	}
	266	Py_DECREF( tmp_next_value_1 );
	267	}
	268			227
	269	#if 0		228	#if 0
	270	RESTORE_FRAME_EXCEPTION( frame_297d7bfb00f7c40b6f314d040580194d );		229	RESTORE_FRAME_EXCEPTION( frame_297d7bfb00f7c40b6f314d040580194d );
	271	#endif		230	#endif
	272			231
	315	// Return the error.		274	// Return the error.
	316	goto try_except_handler_1;		275	goto try_except_handler_1;
	317			276
	318	frame_no_exception_1:;		277	frame_no_exception_1:;
	319	{		278	{
n	320	if ( var_x == NULL )	n	279	CHECK_OBJECT( var_x );
	321	{
	322
	323	exception_type = PyExc_UnboundLocalError;
	324	Py_INCREF( exception_type );
	325	exception_value = PyUnicode_FromFormat( "local variable '%s' referenced before assignment", "x" );
	326	exception_tb = NULL;
	327	NORMALIZE_EXCEPTION( &exception_type, &exception_value, &exception_tb );
	328	CHAIN_EXCEPTION( exception_value );
	329
	330
	331
	332	goto try_except_handler_1;
	333	}
	334
	335	tmp_return_value = var_x;		280	tmp_return_value = var_x;
	336	Py_INCREF( tmp_return_value );		281	Py_INCREF( tmp_return_value );
	337	goto try_return_handler_1;		282	goto try_return_handler_1;
	338	}		283	}
	339	// tried codes exits in all cases		284	// tried codes exits in all cases
	371	exception_lineno = 0;		316	exception_lineno = 0;
	372			317
	373	{		318	{
	374	Py_XDECREF( var_gen );		319	Py_XDECREF( var_gen );
	375	var_gen = NULL;		320	var_gen = NULL;
t	376		t
	377	}
	378	{
	379	Py_XDECREF( var_x );
	380	var_x = NULL;
	381			321
	382	}		322	}
	383	{		323	{
	384	Py_XDECREF( var_generator );		324	Py_XDECREF( var_generator );
	385	var_generator = NULL;		325	var_generator = NULL;