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| author | bors <bors@rust-lang.org> | 2016-07-06 20:04:11 -0700 |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2016-07-06 20:04:11 -0700 |
| commit | de78655bca47cac8e783dbb563e7e5c25c1fae40 (patch) | |
| tree | 1e74a08a79b8d12f5166600f3ca19c449d7732ad /src/libstd/sys/unix/stack_overflow.rs | |
| parent | 5c674a11471ec0569f616854d715941757a48a0a (diff) | |
| parent | 547a930835be262ebea5e499dba7555a8a47b992 (diff) | |
| download | rust-de78655bca47cac8e783dbb563e7e5c25c1fae40.tar.gz rust-de78655bca47cac8e783dbb563e7e5c25c1fae40.zip | |
Auto merge of #34652 - jseyfried:fix_expansion_perf, r=nrc
Fix expansion performance regression **syntax-[breaking-change] cc #31645** This fixes #34630 by reverting commit 5bf7970 of PR #33943, which landed in #34424. By removing the `Rc<_>` wrapping around `Delimited` and `SequenceRepetition` in `TokenTree`, 5bf7970 made cloning `TokenTree`s more expensive. While this had no measurable performance impact on the compiler's crates, it caused an order of magnitude performance regression on some macro-heavy code in the wild. I believe this is due to clones of `TokenTree`s in `macro_parser.rs` and/or `macro_rules.rs`. r? @nrc
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