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TaskDeps improvements #147508

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nnethercote
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r? @ghost

@nnethercote
Use contains with task_deps.reads.
cc69b42
@nnethercote
Rename a badly-named variable.
38d7e8b
@nnethercote
Replace TaskDeps::default() with TaskDeps::new().
43e813c 
There are only two places that create a `TaskDeps`. One constructs it
manually, the other uses `default`. It's weird that `default()` uses a
capacity of 128.

This commit just gets rid of `default` and introduces `new` so that
both construction sites can be equivalent.
@nnethercote
Clarify and improve EdgesVec::INLINE_CAPACITY use.
5d00076 
`INLINE_CAPACITY` has two different uses:
- It dictates the inline capacity of `EdgesVec::edges`, which is a
  `SmallVec`.
- It dictates when `TaskDeps` switches from a linear scan lookup to a
  hashset lookup to determine if an edge has been seen before.

These two uses are in the same part of the code, but they're
fundamentally separate and don't need to use the same constant.

This commit separates the two uses, and adds some helpful comments,
making the code clearer. It also changes the value used for the
linear/hashset threshold from 8 to 16, which gives slightly better perf.
@rustbot rustbot added A-query-system Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html) S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Oct 9, 2025
@nnethercote nnethercote closed this Oct 9, 2025
@rustbot rustbot removed the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Oct 9, 2025
@nnethercote nnethercote reopened this Oct 9, 2025
@rustbot rustbot added the S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. label Oct 9, 2025
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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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rust-bors bot commented Oct 9, 2025 •
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⌛ Trying commit 5d00076 with merge ec47f3e…

To cancel the try build, run the command @bors try cancel.

Workflow: https://github.com/rust-lang/rust/actions/runs/18366351257

rust-bors bot added a commit that referenced this pull request Oct 9, 2025
@rust-bors
Auto merge of #147508 - nnethercote:TaskDeps-improvements, r=<try>
ec47f3e 
`TaskDeps` improvements
@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Oct 9, 2025
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rust-bors bot commented Oct 9, 2025

💥 Test timed out after 21600s

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A-query-system Area: The rustc query system (https://rustc-dev-guide.rust-lang.org/query.html) S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. S-waiting-on-perf Status: Waiting on a perf run to be completed. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue.
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