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Copy 1-element arrays as scalars, not vectors #116510

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merged 2 commits into from Oct 12, 2023
Merged

Copy 1-element arrays as scalars, not vectors #116510

merged 2 commits into from Oct 12, 2023

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@scottmcm scottmcm commented Oct 7, 2023 •
edited

For [T; 1] it's silly to copy as <1 x T> when we can just copy as T.

Inspired by #101210 (comment), which pointed out that Option<[u8; 1]> was codegenning worse than Option<u8>.

(I'm not sure why LLVM doesn't optimize out <1 x u8>, but might as well just not emit it in the first place in this codepath.)

I think I bit off too much in #116479; let me try just the scalar case first.

r? @ghost

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Copy 1-element arrays as scalars, not vectors
ae9cec5 
For `[T; 1]` it's silly to copy as `<1 x T>` when we can just copy as `T`.
@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 Oct 7, 2023
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scottmcm commented Oct 7, 2023

@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 Oct 7, 2023
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bors commented Oct 7, 2023

⌛ Trying commit ae9cec5 with merge d52af76...

bors added a commit to rust-lang-ci/rust that referenced this pull request Oct 7, 2023
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Auto merge of rust-lang#116510 - scottmcm:no-1-simd-v2, r=<try>
d52af76 
Copy 1-element arrays as scalars, not vectors

For `[T; 1]` it's silly to copy as `<1 x T>` when we can just copy as `T`.

Inspired by rust-lang#101210 (comment), which pointed out that `Option<[u8; 1]>` was codegenning worse than `Option<u8>`.

(I'm not sure *why* LLVM doesn't optimize out `<1 x u8>`, but might as well just not emit it in the first place in this codepath.)

---

I think I bit off too much in rust-lang#116479; let me try just the scalar case first.

r? `@ghost`
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bors commented Oct 7, 2023

☀️ Try build successful - checks-actions
Build commit: d52af76 (d52af767a3aca66205870ea02f2eef7df5561ec2)

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Finished benchmarking commit (d52af76): 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)		 - - 0
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 -2.4% [-2.6%, -2.2%] 2
All ❌✅ (primary) - - 0

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)		 -9.8% [-10.0%, -9.6%] 6
All ❌✅ (primary) - - 0

Binary size

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

Bootstrap: 624.196s -> 623.177s (-0.16%)
Artifact size: 270.66 MiB -> 270.65 MiB (-0.00%)

@rustbot rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Oct 8, 2023
@scottmcm scottmcm marked this pull request as ready for review October 8, 2023 07:07
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scottmcm commented Oct 8, 2023

Ok, much better. I'll replace #116479 with this one.

r? @erikdesjardins

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rustbot commented Oct 8, 2023

Failed to set assignee to erikdesjardins: invalid assignee

Note: Only org members with at least the repository "read" role, users with write permissions, or people who have commented on the PR may be assigned.

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scottmcm commented Oct 8, 2023

Oops, make that

r? @compiler-errors

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@bors r+

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bors commented Oct 12, 2023

📌 Commit ae9cec5 has been approved by compiler-errors

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 Oct 12, 2023
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bors commented Oct 12, 2023

⌛ Testing commit ae9cec5 with merge dbe2d0a...

bors added a commit to rust-lang-ci/rust that referenced this pull request Oct 12, 2023
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Auto merge of rust-lang#116510 - scottmcm:no-1-simd-v2, r=compiler-er…
dbe2d0a 
…rors

Copy 1-element arrays as scalars, not vectors

For `[T; 1]` it's silly to copy as `<1 x T>` when we can just copy as `T`.

Inspired by rust-lang#101210 (comment), which pointed out that `Option<[u8; 1]>` was codegenning worse than `Option<u8>`.

(I'm not sure *why* LLVM doesn't optimize out `<1 x u8>`, but might as well just not emit it in the first place in this codepath.)

---

I think I bit off too much in rust-lang#116479; let me try just the scalar case first.

r? `@ghost`
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bors commented Oct 12, 2023

💔 Test failed - checks-actions

@bors bors added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Oct 12, 2023
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@bors r=compiler-errors

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bors commented Oct 12, 2023

📌 Commit f5cdd3e has been approved by compiler-errors

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 Oct 12, 2023
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bors commented Oct 12, 2023

⌛ Testing commit f5cdd3e with merge df4379b...

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bors commented Oct 12, 2023

☀️ Test successful - checks-actions
Approved by: compiler-errors
Pushing df4379b to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Oct 12, 2023
@bors bors merged commit df4379b into rust-lang:master Oct 12, 2023
12 checks passed
@rustbot rustbot added this to the 1.75.0 milestone Oct 12, 2023
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Finished benchmarking commit (df4379b): comparison URL.

Overall result: no relevant changes - no action needed

@rustbot label: -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)		 - - 0
Regressions ❌
(secondary)		 - - 0
Improvements ✅
(primary)		 - - 0
Improvements ✅
(secondary)		 -2.3% [-3.8%, -0.9%] 2
All ❌✅ (primary) - - 0

Cycles

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

Binary size

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

Bootstrap: 626.816s -> 626.794s (-0.00%)
Artifact size: 271.27 MiB -> 271.27 MiB (-0.00%)

@github-actions github-actions bot mentioned this pull request Oct 13, 2023
Merged
bors-ferrocene bot added a commit to ferrocene/ferrocene that referenced this pull request Oct 13, 2023
@bors-ferrocene @Nadrieril
@scottmcm @bjorn3 @nnethercote @tgross35 @weiznich @GuillaumeGomez @gurry @bors
Merge #50
099bf0b 
50: Automated pull from upstream `master` r=Dajamante a=github-actions[bot]


This PR pulls the following changes from the upstream repository:

* rust-lang/rust#116619
* rust-lang/rust#115964
* rust-lang/rust#116391
* rust-lang/rust#116510
* rust-lang/rust#116671
  * rust-lang/rust#116669
  * rust-lang/rust#116654
  * rust-lang/rust#116642
  * rust-lang/rust#116625
  * rust-lang/rust#116593
* rust-lang/rust#116649
* rust-lang/rust#116600
* rust-lang/rust#116628



Co-authored-by: Nadrieril <nadrieril+git@gmail.com>
Co-authored-by: Scott McMurray <scottmcm@users.noreply.github.com>
Co-authored-by: bjorn3 <17426603+bjorn3@users.noreply.github.com>
Co-authored-by: Nicholas Nethercote <n.nethercote@gmail.com>
Co-authored-by: Trevor Gross <tmgross@umich.edu>
Co-authored-by: Georg Semmler <github@weiznich.de>
Co-authored-by: Guillaume Gomez <guillaume.gomez@huawei.com>
Co-authored-by: Gurinder Singh <frederick.the.fool@gmail.com>
Co-authored-by: bors <bors@rust-lang.org>
@scottmcm scottmcm deleted the no-1-simd-v2 branch October 14, 2023 22:19
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