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| author | Nicholas Nethercote <nnethercote@mozilla.com> | 2018-12-11 09:06:51 +1100 |
|---|---|---|
| committer | Nicholas Nethercote <nnethercote@mozilla.com> | 2018-12-12 08:38:08 +1100 |
| commit | 0f68749260d04b61dfe2b38dbc423aefe2914a58 (patch) | |
| tree | 272c64f618d7b60c99b5795d749440e5e5ce0142 /src/libsyntax/parse | |
| parent | b755501043d5b27b39f94bcadd57c8d5dedfd6ba (diff) | |
| download | rust-0f68749260d04b61dfe2b38dbc423aefe2914a58.tar.gz rust-0f68749260d04b61dfe2b38dbc423aefe2914a58.zip | |
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.
Diffstat (limited to 'src/libsyntax/parse')
| -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 6b9cc2f9792..83763bd32d4 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()))) |