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| author | kennytm <kennytm@gmail.com> | 2018-12-14 22:10:09 +0800 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2018-12-14 22:10:09 +0800 |
| commit | dadf7fcc2dc76dd90a9f5a4eea595cf7add8ffff (patch) | |
| tree | a9ba7855dc14b44d546cc4b0d2f3509edd68e80e /src/libsyntax/parse/token.rs | |
| parent | 53a2de2d549f8f3af99de7c05fa8caa7aa2f2949 (diff) | |
| parent | 0f68749260d04b61dfe2b38dbc423aefe2914a58 (diff) | |
| download | rust-dadf7fcc2dc76dd90a9f5a4eea595cf7add8ffff.tar.gz rust-dadf7fcc2dc76dd90a9f5a4eea595cf7add8ffff.zip | |
Rollup merge of #56699 - nnethercote:SymbolIndex, r=oli-obk
Use a `newtype_index!` within `Symbol`. This shrinks `Option<Symbol>` from 8 bytes to 4 bytes, which shrinks `Token` from 24 bytes to 16 bytes. This reduces instruction counts by up to 1% across a range of benchmarks. r? @oli-obk
Diffstat (limited to 'src/libsyntax/parse/token.rs')
| -rw-r--r-- | src/libsyntax/parse/token.rs | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libsyntax/parse/token.rs b/src/libsyntax/parse/token.rs index 8e4d3c0166b..ed746657459 100644 --- a/src/libsyntax/parse/token.rs +++ b/src/libsyntax/parse/token.rs @@ -207,6 +207,10 @@ pub enum Token { Eof, } +// `Token` is used a lot. Make sure it doesn't unintentionally get bigger. +#[cfg(target_arch = "x86_64")] +static_assert!(MEM_SIZE_OF_STATEMENT: mem::size_of::<Token>() == 16); + impl Token { pub fn interpolated(nt: Nonterminal) -> Token { Token::Interpolated(Lrc::new((nt, LazyTokenStream::new()))) |