Optimize `rustc_lexer` by Julian-Wollersberger · Pull Request #91393 · rust-lang...
source link: https://github.com/rust-lang/rust/pull/91393
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cursor.first() method in
rustc_lexer now calls the
chars.next() method instead of
This allows LLVM to optimize the code better. The biggest win is that
eat_while() is now fully inlined and generates better assembly. This improves the lexer's performance by 35% in a micro-benchmark I made (Lexing all 18MB of code in the compiler directory). But lexing is only a small part of the overall compilation time, so I don't know how significant it is.
Big thanks to criterion and
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