Optimize proc macro bridge #85390
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Optimize proc macro bridge #85390
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@bors try @rust-timer queue |
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Awaiting bors try build completion. @rustbot label: +S-waiting-on-perf |
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⌛ Trying commit 4df5d58e6e7ca658565a0ffc9853cd791788ea29 with merge 55c4f6ccc851db7f04cd03a160665208bcaa65ea... |
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☀️ Try build successful - checks-actions |
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Queued 55c4f6ccc851db7f04cd03a160665208bcaa65ea with parent fe72845, future comparison URL. |
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Finished benchmarking try commit (55c4f6ccc851db7f04cd03a160665208bcaa65ea): comparison url. Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. Please note that if the perf results are neutral, you should likely undo the rollup=never given below by specifying Importantly, though, if the results of this run are non-neutral do not roll this PR up -- it will mask other regressions or improvements in the roll up. @bors rollup=never |
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I don’t think adjustment on ra side is required, but we’ll want to port this over some day to keep the code identical. I wonder if we should look into sharing the impl here via a published crate, and not via copy-paste. cc @edwin0cheng |
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copy_from_slice generally falls back to memcpy/memmove, which is much more expensive than we need to write a single element in. This saves 0.26% instructions on the diesel benchmark.
This is a 0.15% win on diesel.
This allows a more efficient implementation (avoiding a fallback to memmove, which is not optimal for short writes). This saves 0.29% on diesel.
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@bors r+ |
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📌 Commit 8c20808 has been approved by |
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⌛ Testing commit 8c20808 with merge 73f497f7caef0a3168037b452f46917b93c85590... |
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The job Click to see the possible cause of the failure (guessed by this bot) |
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💔 Test failed - checks-actions |
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@bors retry thread 'main' panicked at 'client.read_exact(&mut header) failed with Connection reset by peer (os error 104)', src/tools/remote-test-client/src/main.rs:310:9 |
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☀️ Test successful - checks-actions |
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| extend_from_slice: extern "C" fn(Buffer<T>, Slice<'_, T>) -> Buffer<T>, | ||
| reserve: extern "C" fn(Buffer<T>, usize) -> Buffer<T>, |
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This is the last use of Slice and now Slice can be removed (not sure why it didn't warn/error as unused).
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proc_macro/bridge: Remove dead code Slice type See rust-lang#85390 (comment)
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proc_macro/bridge: Remove dead code Slice type See rust-lang#85390 (comment)
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This optimizes the proc macro bridge code for a win of 0.7% instruction counts on the diesel-check benchmark (non-incr, full). These wins are small, but hopefully not limited to just the diesel benchmark; the code is also not seriously impacted by the changes here.