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tsibley/example.py

Last active October 26, 2023 21:41
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Python optimization levels
Raw
example.py
"""\
DOCSTRING\
"""
print(__doc__)
if __debug__:
print("DEBUGGING")
if not __debug__:
print("OPTIMIZING")
assert False, "ASSERT"
Raw
opt-0
# python3.11 -m dis example.py
0 0 RESUME 0
1 2 LOAD_CONST 0 ('DOCSTRING')
4 STORE_NAME 0 (__doc__)
5 6 PUSH_NULL
8 LOAD_NAME 1 (print)
10 LOAD_NAME 0 (__doc__)
12 PRECALL 1
16 CALL 1
26 POP_TOP
7 28 NOP
8 30 PUSH_NULL
32 LOAD_NAME 1 (print)
34 LOAD_CONST 2 ('DEBUGGING')
36 PRECALL 1
40 CALL 1
50 POP_TOP
10 52 NOP
13 54 LOAD_ASSERTION_ERROR
56 LOAD_CONST 5 ('ASSERT')
58 PRECALL 0
62 CALL 0
72 RAISE_VARARGS 1
Raw
opt-1
# python3.11 -O -m dis example.py
0 0 RESUME 0
1 2 LOAD_CONST 0 ('DOCSTRING')
4 STORE_NAME 0 (__doc__)
5 6 PUSH_NULL
8 LOAD_NAME 1 (print)
10 LOAD_NAME 0 (__doc__)
12 PRECALL 1
16 CALL 1
26 POP_TOP
7 28 NOP
10 30 NOP
11 32 PUSH_NULL
34 LOAD_NAME 1 (print)
36 LOAD_CONST 4 ('OPTIMIZING')
38 PRECALL 1
42 CALL 1
52 POP_TOP
54 LOAD_CONST 5 (None)
56 RETURN_VALUE
Raw
opt-2
# python3.11 -OO -m dis example.py
0 0 RESUME 0
1 2 NOP
5 4 PUSH_NULL
6 LOAD_NAME 0 (print)
8 LOAD_NAME 1 (__doc__)
10 PRECALL 1
14 CALL 1
24 POP_TOP
7 26 NOP
10 28 NOP
11 30 PUSH_NULL
32 LOAD_NAME 0 (print)
34 LOAD_CONST 3 ('OPTIMIZING')
36 PRECALL 1
40 CALL 1
50 POP_TOP
52 LOAD_CONST 4 (None)
54 RETURN_VALUE
Raw
side-by-side
# pr --omit-pagination --merge --page-width=180 opt-[012]
# python3.11 -m dis example.py # python3.11 -O -m dis example.py # python3.11 -OO -m dis example.py
0 0 RESUME 0 0 0 RESUME 0 0 0 RESUME 0
1 2 LOAD_CONST 0 ('DOCSTRING') 1 2 LOAD_CONST 0 ('DOCSTRING') 1 2 NOP
4 STORE_NAME 0 (__doc__) 4 STORE_NAME 0 (__doc__)
5 6 PUSH_NULL 5 6 PUSH_NULL 5 4 PUSH_NULL
8 LOAD_NAME 1 (print) 8 LOAD_NAME 1 (print) 6 LOAD_NAME 0 (print)
10 LOAD_NAME 0 (__doc__) 10 LOAD_NAME 0 (__doc__) 8 LOAD_NAME 1 (__doc__)
12 PRECALL 1 12 PRECALL 1 10 PRECALL 1
16 CALL 1 16 CALL 1 14 CALL 1
26 POP_TOP 26 POP_TOP 24 POP_TOP
7 28 NOP 7 28 NOP 7 26 NOP
8 30 PUSH_NULL
32 LOAD_NAME 1 (print)
34 LOAD_CONST 2 ('DEBUGGING')
36 PRECALL 1
40 CALL 1
50 POP_TOP
10 52 NOP 10 30 NOP 10 28 NOP
11 32 PUSH_NULL 11 30 PUSH_NULL
34 LOAD_NAME 1 (print) 32 LOAD_NAME 0 (print)
36 LOAD_CONST 4 ('OPTIMIZING') 34 LOAD_CONST 3 ('OPTIMIZING')
38 PRECALL 1 36 PRECALL 1
42 CALL 1 40 CALL 1
52 POP_TOP 50 POP_TOP
54 LOAD_CONST 5 (None) 52 LOAD_CONST 4 (None)
56 RETURN_VALUE 54 RETURN_VALUE
13 54 LOAD_ASSERTION_ERROR
56 LOAD_CONST 5 ('ASSERT')
58 PRECALL 0
62 CALL 0
72 RAISE_VARARGS 1
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