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| author | bors <bors@rust-lang.org> | 2018-06-28 13:23:07 +0000 |
|---|---|---|
| committer | bors <bors@rust-lang.org> | 2018-06-28 13:23:07 +0000 |
| commit | 5d95db34a472dc09a90737c83ab533b840dcd224 (patch) | |
| tree | 5c110943f3ff5516511a14e93af0b5abd6450452 /src/libstd | |
| parent | 9f79d2f86af73da483f4fe8e2422c15c79221d32 (diff) | |
| parent | 851cc39503a53b38ecbdd03bd391289e095bd7ca (diff) | |
| download | rust-5d95db34a472dc09a90737c83ab533b840dcd224.tar.gz rust-5d95db34a472dc09a90737c83ab533b840dcd224.zip | |
Auto merge of #51630 - joshlf:map-split-perf, r=dtolnay
Optimize RefCell refcount tracking Address the performance concern raised in https://github.com/rust-lang/rust/pull/51466#issuecomment-398255276 cc @dtolnay @nnethercote @rust-lang/wg-compiler-performance cc @RalfJung @jhjourdan for soundness concerns Can somebody kick off a perf run on this? I'm not sure how that's done, but I understand it has to be started manually. The idea of this change is to switch to representing mutable refcount as values below 0 to eliminate some branching that was required with the old algorithm.
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