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Title: gh-138912: Add fast path for match class patterns without sub-patterns by cdce8p · Pull Request #144820 · python/cpython · GitHub

Open Graph Title: gh-138912: Add fast path for match class patterns without sub-patterns by cdce8p · Pull Request #144820 · python/cpython

X Title: gh-138912: Add fast path for match class patterns without sub-patterns by cdce8p · Pull Request #144820 · python/cpython

Description: Extracted from #139080. This builds on the work merged with 75d4839. Add a fast path for match class patterns without any sub-patterns. This avoids creating a new (empty) tuple, pushing it to the stack and subsequently unpacking the tuple result from the MATCH_CLASS opcode again. __ 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 0.2718 Match 0.2659 # After Match 0.2253 -15.27% If specialization disabled, the performance improvement is even better with -37.44%. Issue: gh-138912 📚 Documentation preview 📚: https://cpython-previews--144820.org.readthedocs.build/

Open Graph Description: Extracted from #139080. This builds on the work merged with 75d4839. Add a fast path for match class patterns without any sub-patterns. This avoids creating a new (empty) tuple, pushing it to the s...

X Description: Extracted from #139080. This builds on the work merged with 75d4839. Add a fast path for match class patterns without any sub-patterns. This avoids creating a new (empty) tuple, pushing it to the s...

Opengraph URL: https://github.com/python/cpython/pull/144820

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