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Remove VecMap #109280

Merged
merged 1 commit into from
Mar 22, 2023
Merged

Remove VecMap #109280

merged 1 commit into from
Mar 22, 2023

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compiler-errors
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Not sure what the use of this data structure is over just using FxIndexMap or a Vec.

r? @ghost

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. T-compiler Relevant to the compiler team, which will review and decide on the PR/issue. labels Mar 17, 2023
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@bors try @rust-timer queue

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@rustbot rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Mar 17, 2023
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bors commented Mar 17, 2023

⌛ Trying commit 6639538 with merge d1fbeb4125f24c53c41b7080d5e7b63753eb29bb...

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In general for small lengths the VecMap may be a win, since it avoids hashing and keeps items densely populated. This is especially true for small integer-like keys where iteration and comparison is likely to be very fast.

But I suppose we can look at what perf comes back with at least to see whether any current benchmarks are negatively (or positively) affected.

I suspect that for most compiler usage even if we wanted this we'd want it to be a hybrid between VecMap and FxIndexMap depending on length.

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bors commented Mar 17, 2023

☀️ Try build successful - checks-actions
Build commit: d1fbeb4125f24c53c41b7080d5e7b63753eb29bb (d1fbeb4125f24c53c41b7080d5e7b63753eb29bb)

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In general for small lengths the VecMap may be a win, since it avoids hashing and keeps items densely populated. This is especially true for small integer-like keys where iteration and comparison is likely to be very fast.

Cool, thanks for the context. Yeah, I was just putting this up to see what would happen. If there is a perf hit, I wonder then, conversely, if there may be some benefit in backing VecMap with SmallVec. Anyways, I guess we'll see.

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Finished benchmarking commit (d1fbeb4125f24c53c41b7080d5e7b63753eb29bb): comparison URL.

Overall result: no relevant changes - no action needed

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR may lead to changes in compiler perf.

@bors rollup=never
@rustbot label: -S-waiting-on-perf -perf-regression

Instruction count

This benchmark run did not return any relevant results for this metric.

Max RSS (memory usage)

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)		 2.0% [0.4%, 3.6%] 5
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 -2.1% [-2.1%, -2.1%] 1
All ❌✅ (primary) 2.0% [0.4%, 3.6%] 5

Cycles

Results

This is a less reliable metric that may be of interest but was not used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)		 0.6% [0.4%, 0.7%] 6
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) 0.6% [0.4%, 0.7%] 6

@rustbot rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Mar 18, 2023
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compiler-errors commented Mar 18, 2023 •
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shrug, i still prefer to remove VecMap because it's only used for opaques, and it isn't hot enough to justify its special behavior

r? compiler

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@bors r+

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bors commented Mar 18, 2023

📌 Commit 6639538 has been approved by Mark-Simulacrum

It is now in the queue for this repository.

@bors bors added S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Mar 18, 2023
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perf was neutral
@bors rollup=maybe

Dylan-DPC added a commit to Dylan-DPC/rust that referenced this pull request Mar 21, 2023
@Dylan-DPC
Rollup merge of rust-lang#109280 - compiler-errors:no-vec-map, r=Mark…
244e78f 
…-Simulacrum

Remove `VecMap`

Not sure what the use of this data structure is over just using `FxIndexMap` or a `Vec`.

r? `@ghost`
@Dylan-DPC Dylan-DPC mentioned this pull request Mar 21, 2023
Closed
Dylan-DPC added a commit to Dylan-DPC/rust that referenced this pull request Mar 22, 2023
@Dylan-DPC
Rollup merge of rust-lang#109280 - compiler-errors:no-vec-map, r=Mark…
1fc0377 
…-Simulacrum

Remove `VecMap`

Not sure what the use of this data structure is over just using `FxIndexMap` or a `Vec`.

r? ``@ghost``
@Dylan-DPC Dylan-DPC mentioned this pull request Mar 22, 2023
Closed
@Dylan-DPC Dylan-DPC mentioned this pull request Mar 22, 2023
Merged
bors added a commit to rust-lang-ci/rust that referenced this pull request Mar 22, 2023
@bors
Auto merge of rust-lang#109496 - Dylan-DPC:rollup-u8rsi3h, r=Dylan-DPC
a266f11 
Rollup of 11 pull requests

Successful merges:

 - rust-lang#100311 (Fix handling of trailing bare CR in str::lines)
 - rust-lang#108997 (Change text -> rust highlighting in sanitizer.md)
 - rust-lang#109179 (move Option::as_slice to intrinsic)
 - rust-lang#109187 (Render source page layout with Askama)
 - rust-lang#109280 (Remove `VecMap`)
 - rust-lang#109295 (refactor `fn bootstrap::builder::Builder::compiler_for` logic)
 - rust-lang#109312 (rustdoc: Cleanup parent module tracking for doc links)
 - rust-lang#109317 (Update links for custom discriminants.)
 - rust-lang#109405 (RPITITs are `DefKind::Opaque` with new lowering strategy)
 - rust-lang#109414 (Do not consider synthesized RPITITs on missing items checks)
 - rust-lang#109435 (Detect uninhabited types early in const eval)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup
@bors bors merged commit 70918ec into rust-lang:master Mar 22, 2023
@rustbot rustbot added this to the 1.70.0 milestone Mar 22, 2023
@compiler-errors compiler-errors deleted the no-vec-map branch August 11, 2023 20:11
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