Delegation: second attempt to improve perf

[Bryanskiy]

Possible perf fix for #125929

r? @petrochenkov

[matthiaskrgr]

@bors try @rust-timer queue

[bors]

⌛ Trying commit 9b097b2 with merge 552a694...

[bors]

☀️ Try build successful - checks-actions
Build commit: 552a694 (552a69497bb18adcc5743503fec5d2f39bb4cfef)

[rust-timer]

Finished benchmarking commit (552a694): comparison URL.

Overall result: ❌✅ regressions and improvements - 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.

Next Steps: If you can justify the regressions found in this try perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please fix the regressions and do another perf run. If the next run shows neutral or positive results, the label will be automatically removed.

@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)	0.2%	[0.2%, 0.2%]	3
Improvements ✅ (primary)	-0.4%	[-0.6%, -0.2%]	6
Improvements ✅ (secondary)	-0.6%	[-1.2%, -0.1%]	10
All ❌✅ (primary)	-0.4%	[-0.6%, -0.2%]	6

Max RSS (memory usage)

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

Cycles

Results (primary 3.2%)

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)	3.2%	[3.2%, 3.2%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	3.2%	[3.2%, 3.2%]	1

Binary size

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

Bootstrap: 755.634s -> 755.372s (-0.03%)
Artifact size: 336.68 MiB -> 336.67 MiB (-0.00%)

[petrochenkov]

@bors r+

[bors]

📌 Commit 9b097b2 has been approved by petrochenkov

It is now in the queue for this repository.

[bors]

⌛ Testing commit 9b097b2 with merge 8f63e9f...

[bors]

☀️ Test successful - checks-actions
Approved by: petrochenkov
Pushing 8f63e9f to master...

[rust-timer]

Finished benchmarking commit (8f63e9f): comparison URL.

Overall result: ✅ 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
Improvements ✅ (primary)	-0.4%	[-0.7%, -0.2%]	9
Improvements ✅ (secondary)	-0.5%	[-1.1%, -0.1%]	9
All ❌✅ (primary)	-0.4%	[-0.7%, -0.2%]	9

Max RSS (memory usage)

Results (primary 0.1%)

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)	1.2%	[1.2%, 1.2%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-1.0%	[-1.0%, -1.0%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.1%	[-1.0%, 1.2%]	2

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: 756.925s -> 757.678s (0.10%)
Artifact size: 336.81 MiB -> 336.76 MiB (-0.02%)