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Use FxHashMap in syntax_pos::symbol::Interner::intern. #50174
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Because it's faster than HashMap. This change reduces the time taken for a few of the rustc-perf benchmarks, mostly the small ones, by up to 5%.
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Thanks, @nnethercote! @bors r+ |
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kennytm
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to kennytm/rust
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Apr 24, 2018
…ichaelwoerister
Use FxHashMap in syntax_pos::symbol::Interner::intern.
Because it's faster than HashMap.
This change reduces the time taken for a few of the rustc-perf
benchmarks, mostly the small ones, by up to 5%.
```
coercions
avg: -1.3% min: -5.5% max: -0.0%
helloworld-check
avg: -2.3% min: -3.5% max: -1.8%
deeply-nested-check
avg: -1.4% min: -3.2% max: -0.5%
tuple-stress-opt
avg: -0.7% min: -2.0% max: -0.1%
unify-linearly-check
avg: -1.2% min: -1.9% max: -0.6%
coercions-check
avg: -0.8% min: -1.3% max: -0.4%
unused-warnings-check
avg: -1.0% min: -1.3% max: -0.8%
deeply-nested-opt
avg: -0.5% min: -1.2% max: -0.2%
deeply-nested
avg: -0.7% min: -1.2% max: -0.4%
helloworld
avg: -0.8% min: -1.1% max: -0.7%
tuple-stress-check
avg: -0.5% min: -1.0% max: -0.1%
unused-warnings
avg: -0.8% min: -1.0% max: -0.7%
unused-warnings-opt
avg: -0.8% min: -1.0% max: -0.7%
coercions-opt
avg: -0.5% min: -1.0% max: -0.1%
helloworld-opt
avg: -0.7% min: -1.0% max: -0.6%
```
bors
added a commit
that referenced
this pull request
Apr 24, 2018
Rollup of 11 pull requests Successful merges: - #49461 (std: Child::kill() returns error if process has already exited) - #49727 (Add Cell::update) - #49812 (Fix revision support for UI tests.) - #49829 (Add doc links to `std::os` extension traits) - #49906 (Stabilize `std::hint::unreachable_unchecked`.) - #49970 (Deprecate Read::chars and char::decode_utf8) - #49985 (don't see issue #0) - #50118 (fix search bar bug) - #50139 (encourage descriptive issue titles) - #50174 (Use FxHashMap in syntax_pos::symbol::Interner::intern.) - #50185 (core: Fix overflow in `int::mod_euc` when `self < 0 && rhs == MIN`) Failed merges:
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Because it's faster than HashMap.
This change reduces the time taken for a few of the rustc-perf
benchmarks, mostly the small ones, by up to 5%.