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Use Rc instead of Box for interned strings. #50549
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r? @aturon (rust_highfive has picked a reviewer for you, use r? to override) |
@Zoxc, do you see a problem with using |
This use of |
OTOH, there wouldn't be a real downside to using |
It would be slower. |
Yes, but I wouldn't expect the difference to be noticeable. |
We currently heap-allocate each one twice, once for Interner::names and once for Interner::strings. Using Rc instead means each one is allocated once and then shared. This speeds up numerous rustc-perf runs, the best by 4%.
Updated with the r? @Zoxc |
Allocate Symbol strings from an arena This is an alternative to #50549 cc @nnethercote r? @michaelwoerister
#50607 is a much better way of doing things. |
Allocate Symbol strings from an arena This is an alternative to rust-lang#50549 cc @nnethercote r? @michaelwoerister
We currently heap-allocate each one twice, once for Interner::names and
once for Interner::strings. Using Rc instead means each one is allocated
once and then shared.
This speeds up numerous rustc-perf runs, the best by 4%.
Here are details for the ones with an improvement of 1% or more: