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Use &IndexSlice instead of &IndexVec where possible #109819

Merged
merged 1 commit into from
Apr 3, 2023
Merged

Use &IndexSlice instead of &IndexVec where possible #109819

merged 1 commit into from
Apr 3, 2023

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scottmcm
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All the same reasons as for [T]: more general, less pointer chasing, and &mut IndexSlice emphasizes that it doesn't change length.

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 31, 2023
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rustbot commented Mar 31, 2023

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

@scottmcm scottmcm added S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Mar 31, 2023
@scottmcm scottmcm force-pushed the index-slice branch 2 times, most recently from 77c9298 to b47b43b Compare March 31, 2023 17:17
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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 31, 2023
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bors commented Mar 31, 2023

⌛ Trying commit b47b43b4f22bfb374597a0c8e8b683970867776d with merge 0e80712d44f9e728430eba2130bb30f813c99ad1...

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bors commented Mar 31, 2023

☀️ Try build successful - checks-actions
Build commit: 0e80712d44f9e728430eba2130bb30f813c99ad1 (0e80712d44f9e728430eba2130bb30f813c99ad1)

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Finished benchmarking commit (0e80712d44f9e728430eba2130bb30f813c99ad1): comparison URL.

Overall result: ✅ improvements - 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 is a highly reliable metric that was used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)		 - - 0
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 -0.3% [-0.3%, -0.3%] 1
All ❌✅ (primary) - - 0

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)		 - - 0
Regressions ❌
(secondary)		 2.0% [1.8%, 2.1%] 2
Improvements ✅
(primary)		 -3.3% [-3.3%, -3.3%] 1
Improvements ✅
(secondary)		 -2.9% [-3.3%, -2.5%] 2
All ❌✅ (primary) -3.3% [-3.3%, -3.3%] 1

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
Regressions ❌
(secondary)		 5.3% [4.9%, 5.4%] 3
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 - - 0
All ❌✅ (primary) - - 0

@rustbot rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Mar 31, 2023
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r? @WaffleLapkin
@rustbot ready

@rustbot rustbot added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Mar 31, 2023
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Use &IndexSlice instead of &IndexVec where possible
a2ee759 
All the same reasons as for `[T]`: more general, less pointer chasing, and `&mut IndexSlice` emphasizes that it doesn't change *length*.
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scottmcm commented Apr 3, 2023

(Update was just a rebase atop #109849, since it touched a couple of the same places.)

WaffleLapkin
WaffleLapkin approved these changes Apr 3, 2023
View reviewed changes
compiler/rustc_index/src/vec.rs
@@ -116,7 +130,7 @@ impl<I: Idx, T> IndexVec<I, T> {
}

#[inline]
pub fn from_elem<S>(elem: T, universe: &IndexVec<I, S>) -> Self
pub fn from_elem<S>(elem: T, universe: &IndexSlice<I, S>) -> Self
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It would be nice to have documentation here, I don't really get why/how you'd use this method...

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@scottmcm scottmcm Apr 3, 2023 •
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Sent as PR #109913

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@bors r+

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bors commented Apr 3, 2023

📌 Commit a2ee759 has been approved by WaffleLapkin

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 Apr 3, 2023
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bors commented Apr 3, 2023

⌛ Testing commit a2ee759 with merge bf41e75...

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bors commented Apr 3, 2023

☀️ Test successful - checks-actions
Approved by: WaffleLapkin
Pushing bf41e75 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Apr 3, 2023
@bors bors merged commit bf41e75 into rust-lang:master Apr 3, 2023
@rustbot rustbot added this to the 1.70.0 milestone Apr 3, 2023
@bors bors mentioned this pull request Apr 3, 2023
Merged
@scottmcm scottmcm deleted the index-slice branch April 3, 2023 20:52
@scottmcm scottmcm mentioned this pull request Apr 3, 2023
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Finished benchmarking commit (bf41e75): comparison URL.

Overall result: ❌✅ regressions and improvements - no action needed

@rustbot label: -perf-regression

Instruction count

This is a highly reliable metric that was used to determine the overall result at the top of this comment.

mean range count
Regressions ❌
(primary)		 - - 0
Regressions ❌
(secondary)		 0.2% [0.2%, 0.2%] 2
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 -0.9% [-1.2%, -0.5%] 6
All ❌✅ (primary) - - 0

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)		 3.4% [3.4%, 3.4%] 1
Regressions ❌
(secondary)		 0.8% [0.8%, 0.8%] 1
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 -2.8% [-2.8%, -2.8%] 1
All ❌✅ (primary) 3.4% [3.4%, 3.4%] 1

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
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 -2.0% [-2.0%, -1.9%] 2
All ❌✅ (primary) - - 0

aliemjay added a commit to aliemjay/rust that referenced this pull request Apr 4, 2023
@aliemjay
Rollup merge of rust-lang#109913 - scottmcm:index-slice, r=WaffleLapkin
68306fc 
Doc-comment  `IndexVec::from_elem` and use it in a few more places

Since this PR is a reply to rust-lang#109819 (comment),
r? `@WaffleLapkin`
compiler-errors added a commit to compiler-errors/rust that referenced this pull request Apr 4, 2023
@compiler-errors
Rollup merge of rust-lang#109913 - scottmcm:index-slice, r=WaffleLapkin
5485a54 
Doc-comment  `IndexVec::from_elem` and use it in a few more places

Since this PR is a reply to rust-lang#109819 (comment),
r? ``@WaffleLapkin``
@celinval celinval mentioned this pull request Apr 26, 2023
Merged
4 tasks
celinval added a commit to model-checking/kani that referenced this pull request May 16, 2023
@celinval
Upgrade the toolchain to nightly-2023-04-16 (#2406)
6f7aa65 
Update the toolchain to use nightly-2023-04-16. Changes were related to the following changes to the toolchain:

- rust-lang/rust#108944
- rust-lang/rust#108148
- rust-lang/rust#108471
- rust-lang/rust#109358
- rust-lang/rust#109849
- rust-lang/rust#109819
- rust-lang/rust#109718
- rust-lang/rust#109092
- rust-lang/rust#108856
- rust-lang/rust#105613
- rust-lang/rust#103042
- rust-lang/rust#109716
- rust-lang/rust#108340
- rust-lang/rust#102906
- rust-lang/rust#98112
- rust-lang/rust#108080
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