Specialize Vec::clone_from for Copy types
#87913
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This should improve performance and reduce code size. This also improves `clone_from` for `String`, `OsString` and `PathBuf`.
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r? @dtolnay (rust-highfive has picked a reviewer for you, use r? to override) |
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dtolnay
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Aug 10, 2021
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Looks good. SpecCloneFrom needs to be feature gated on not(no_global_oom_handling) though to fix the failed build.
error[E0599]: no method named `extend_from_slice` found for mutable reference `&mut Vec<T, A>` in the current scopeThis should improve performance and reduce code size.
Would you be able to put together a microbenchmark measuring either of these things?
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Here is a godbolt link for comparison: https://rust.godbolt.org/z/6oGTYs9Ys Specialization removes a branch and a |
dtolnay
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Aug 14, 2021
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@bors r+ |
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📌 Commit 94d6b22 has been approved by |
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☀️ Test successful - checks-actions |
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This should improve performance and reduce code size.
This also improves
clone_fromforString,OsStringandPathBuf.