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2% faster according to codspeed! 🎉 🌮 |
MichaReiser
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Jan 24, 2025
| // fields are sets/vecs with the same length. | ||
| let a = (a.live_bindings.iter()) | ||
| .zip(a.constraints) | ||
| .zip(a.constraints.iter_mut()) |
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A comment here would probably be useful. It wasn't immediately clear to me why we use a &mut here even with your explanation. Should we do the same in the other merge method and for `visibility_constraints?
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I think it won't be as beneficial for visibility_constraints, since those are already smaller. But I can check! (And I will add the comment)
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Yep as expected, it was a wash doing the same thing to visibility_constraints. (Those are 32-bit IDs, which are cheap to copy, and not 24-byte BitSets.)
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Amazing, thank you!! |
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* main: Run `cargo update` (#15769) [red-knot] Document public symbol type inferece (#15766) Update dawidd6/action-download-artifact action to v8 (#15760) Update NPM Development dependencies (#15758) Update pre-commit dependencies (#15756) Update dependency ruff to v0.9.3 (#15755) Update dependency mdformat-mkdocs to v4.1.2 (#15754) Update Rust crate uuid to v1.12.1 (#15753) Update Rust crate unicode-ident to v1.0.15 (#15752) Fix docstring in ruff_annotate_snippets (#15748) Update Rust crate insta to v1.42.1 (#15751) Update Rust crate clap to v4.5.27 (#15750) Add references to `trio.run_process` and `anyio.run_process` (#15761) [`ruff`] Do not emit diagnostic when all arguments to `zip()` are variadic (`RUF058`) (#15744) [red-knot] Ensure differently ordered unions are considered equivalent when they appear inside tuples inside top-level intersections (#15743) [red-knot] Ensure differently ordered unions and intersections are understood as equivalent even inside arbitrarily nested tuples (#15740) [red-knot] Promote the `all_type_pairs_are_assignable_to_their_union` property test to stable (#15739) [`pylint`] Do not trigger `PLR6201` on empty collections (#15732) Improve the file watching failure error message (#15728) Speed symbol state merging back up (#15731)
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This is a follow-up to #15702 that hopefully claws back the 1% performance regression. Assuming it works, the trick is to iterate over the constraints vectors via mut reference (aka a single pointer), so that we're not copying
BitSets into and out of the zip tuples as we iterate. We usestd::mem::takeas a poor-man's move constructor only at the very end, when we're ready to emplace it into the result. (C++ idioms intended! 😄)With local testing via hyperfine, I'm seeing this be 1-3% faster than
mainmost of the time — though a small number of runs (1 in 10, maybe?) are a wash or havemainfaster. Fingers crossed to see what codspeed says!