bpo-47053: Refactor BINARY_OP_INPLACE_ADD_UNICODE #32122
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Microbenchmark: Mean +- std dev: [before] 454 us +- 3 us -> [after] 437 us +- 4 us: 1.04x faster |
Fidget-Spinner
approved these changes
Mar 26, 2022
| PyObject *var = GETLOCAL(next_oparg); | ||
| DEOPT_IF(var != left, BINARY_OP); | ||
| PyObject **target_local = &GETLOCAL(_Py_OPARG(true_next)); | ||
| DEOPT_IF(*target_local != left, BINARY_OP); |
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On the last iteration here for example:
>>> pairs = [('foo',) * 2 for _ in range(10_000)]
>>> pairs.append(('foo', 'bar'))
>>> def f():
... for x, y in pairs:
... x = y + 'a'
...
>>> f()
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Letting
PyUnicode_Appenddirectly modify the target local avoids the nextSTORE_FAST, and it avoids theGETLOCAL(next_oparg) = NULL;.https://bugs.python.org/issue47053