Use two vectors in nearest_common_ancestor. #50365
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When looking at any scope in scope chain A, we only need to look for matches among scopes previously seen in scope chain B, and vice versa. This halves the number of "seen before?" comparisons, speeding up some runs of style-servo, clap-rs, and syn by 1--2%.
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…-two-vecs, r=nikomatsakis Use two vectors in nearest_common_ancestor. When looking at any scope in scope chain A, we only need to look for matches among scopes previously seen in scope chain B, and vice versa. This halves the number of "seen before?" comparisons, speeding up some runs of style-servo, clap-rs, and syn by 1--2%. Thanks to @kirillkh for the suggestion. r? @nikomatsakis
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Rollup of 12 pull requests Successful merges: - #50302 (Add query search order check) - #50320 (Fix invalid path generation in rustdoc search) - #50349 (Rename "show type declaration" to "show declaration") - #50360 (Clarify wordings of the `unstable_name_collision` lint.) - #50365 (Use two vectors in nearest_common_ancestor.) - #50393 (Allow unaligned reads in constants) - #50401 (Revert "Implement FromStr for PathBuf") - #50406 (Forbid constructing empty identifiers from concat_idents) - #50407 (Always inline simple BytePos and CharPos methods.) - #50416 (check if the token is a lifetime before parsing) - #50417 (Update Cargo) - #50421 (Fix ICE when using a..=b in a closure.) Failed merges:
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When looking at any scope in scope chain A, we only need to look for
matches among scopes previously seen in scope chain B, and vice versa.
This halves the number of "seen before?" comparisons, speeding up some
runs of style-servo, clap-rs, and syn by 1--2%.
Thanks to @kirillkh for the suggestion.
r? @nikomatsakis