Right-size the VecDeque in coerce_unsized.#50963
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The default capacity of a VecDeque is 8, which is excessive here. In a "base incremental" check build of rustc-perf's tuple-stress benchmark, this decreases total heap allocation by 26%. I couldn't see a clear speedup, but it can't hurt.
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Nice, we'll hopefully be getting rid of that code, cc #50753 |
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…etrochenkov Right-size the `VecDeque` in `coerce_unsized`. The default capacity of a VecDeque is 8, which is excessive here. In a "base incremental" check build of rustc-perf's tuple-stress benchmark, this decreases total heap allocation by 26%. I couldn't see a clear speedup, but it can't hurt.
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Rollup of 15 pull requests Successful merges: - #50846 (Add E0665) - #50849 (CheckLoopVisitor: also visit closure arguments) - #50863 (Make `[T]::len` and `str::len` const fn) - #50875 (rustdoc: use "short form" doc(cfg) printing even when combined with other conditionals) - #50913 (Fix typo in cell.rs) - #50914 (Issue #50636: Improve error diagnostic with missing commas after struct fields.) - #50931 (Inline `try_get`.) - #50932 (Optimize seen Predicate filtering.) - #50945 (Stabilize feature from_ref) - #50946 (rustc: Fix procedural macros generating lifetime tokens) - #50947 (rustdoc: set tab width in rust source blocks) - #50952 (Add the 2018 edition of the book to doc.rust-lang.org) - #50958 (Micro-optimization on PR#50697) - #50961 (Fix FileCheck finding with MSVC) - #50963 (Right-size the `VecDeque` in `coerce_unsized`.) Failed merges:
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The default capacity of a VecDeque is 8, which is excessive here. In a
"base incremental" check build of rustc-perf's tuple-stress benchmark,
this decreases total heap allocation by 26%. I couldn't see a clear
speedup, but it can't hurt.