René's URL Explorer Experiment

Title: gh-138912: Add dedicated opcodes for MatchClass without positional sub-patterns by cdce8p · Pull Request #139080 · python/cpython · GitHub

Open Graph Title: gh-138912: Add dedicated opcodes for MatchClass without positional sub-patterns by cdce8p · Pull Request #139080 · python/cpython

X Title: gh-138912: Add dedicated opcodes for MatchClass without positional sub-patterns by cdce8p · Pull Request #139080 · python/cpython

Description: This PR complements and extends the work done in #138915. In a microbenchmark for bare class matches, the match statement is now even slightly faster than the comparable if statement. With keyword only patterns, the performance is much improved as it's no longer necessary to construct intermediary tuples so that's now only ~20% slower compared to the if equivalent. (Previously it was closer to ~220%). Further improvements can likely be archived if MATCH_CLASS_GET_OPT_ATTR is specialized in a similar manner to LOAD_ATTR. With the specialization for (just) LOAD_ATTR disabled, the match statement equivalent is again slightly faster than the corresponding if clause. __ Micro benchmarks with all specializations enabled. Micro benchmark (bare class pattern) from timeit import timeit setup = """ class A: def __init__(self, x, y): self.x = x self.y = y a = A(1, 2) def f1(a): if isinstance(a, A): return True return False def f2(a): match a: case A(): return True return False """ print(f"If\t{timeit("f1(a)", setup, number=10**7)}") print(f"Match\t{timeit("f2(a)", setup, number=10**7)}") # Before If 0.29646458296338096 Match 0.6549855829798616 # After If 0.2934637920006935 Match 0.2751032500018482 -> -58% Micro benchmark (One keyword attribute) from timeit import timeit setup = """ class A: def __init__(self, x, y): self.x = x self.y = y a = A(1, 2) def f1(a): if isinstance(a, A) and a.x == 1: return True return False def f2(a): match a: case A(x=1): return True return False """ print(f"If\t{timeit("f1(a)", setup, number=10**7)}") print(f"Match\t{timeit("f2(a)", setup, number=10**7)}") # Before If 0.35557704203529283 Match 1.1494590829825029 # After If 0.3604730829974869 Match 0.45169049999822164 -> -61% Issue: gh-138912 📚 Documentation preview 📚: https://cpython-previews--139080.org.readthedocs.build/

Open Graph Description: This PR complements and extends the work done in #138915. In a microbenchmark for bare class matches, the match statement is now even slightly faster than the comparable if statement. With keyword ...

X Description: This PR complements and extends the work done in #138915. In a microbenchmark for bare class matches, the match statement is now even slightly faster than the comparable if statement. With keyword ...

Opengraph URL: https://github.com/python/cpython/pull/139080

X: @github

direct link

Domain: github.com

Links:

Viewport: width=device-width