Hint optimizer about try-reserved capacity

[kornelski]

This is #116568, but limited only to the less-common try_reserve functions to reduce bloat in debug binaries from debug info, while still addressing the main use-case #117925

[rustbot]

r? @Mark-Simulacrum

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[the8472]

@bors try @rust-timer queue

[bors]

⌛ Trying commit 029fbd6 with merge 616f4d8...

[bors]

☀️ Try build successful - checks-actions
Build commit: 616f4d8 (616f4d88e8be2877dcccfa1aa98b1038d406226a)

[rust-timer]

Finished benchmarking commit (616f4d8): 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)	-2.8%	[-2.8%, -2.8%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-2.8%	[-2.8%, -2.8%]	1

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%	[2.0%, 2.0%]	1
Improvements ✅ (primary)	-1.8%	[-1.8%, -1.8%]	1
Improvements ✅ (secondary)	-2.2%	[-2.2%, -2.2%]	1
All ❌✅ (primary)	-1.8%	[-1.8%, -1.8%]	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)	-2.6%	[-2.6%, -2.6%]	1
Improvements ✅ (secondary)	-2.4%	[-2.9%, -2.0%]	5
All ❌✅ (primary)	-2.6%	[-2.6%, -2.6%]	1

Binary size

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)	0.1%	[0.0%, 0.7%]	22
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.1%	[0.0%, 0.7%]	22

Bootstrap: 637.769s -> 637.695s (-0.01%)
Artifact size: 304.51 MiB -> 304.53 MiB (0.00%)

[Mark-Simulacrum]

r? @workingjubilee

[workingjubilee]

@bors r+

[bors]

📌 Commit 029fbd6 has been approved by workingjubilee

It is now in the queue for this repository.

[bors]

⌛ Testing commit 029fbd6 with merge f5ca57e...

[bors]

☀️ Test successful - checks-actions
Approved by: workingjubilee
Pushing f5ca57e to master...

[rust-timer]

Finished benchmarking commit (f5ca57e): 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)	-10.4%	[-23.6%, -0.4%]	6
Improvements ✅ (secondary)	-13.5%	[-19.5%, -7.5%]	2
All ❌✅ (primary)	-10.4%	[-23.6%, -0.4%]	6

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)	0.7%	[0.5%, 1.2%]	3
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-2.3%	[-5.9%, -0.6%]	10
Improvements ✅ (secondary)	-6.9%	[-9.8%, -4.1%]	2
All ❌✅ (primary)	-1.6%	[-5.9%, 1.2%]	13

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)	0.5%	[0.5%, 0.6%]	3
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-6.2%	[-22.4%, -0.4%]	10
Improvements ✅ (secondary)	-16.8%	[-23.0%, -10.6%]	2
All ❌✅ (primary)	-4.7%	[-22.4%, 0.6%]	13

Binary size

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)	0.1%	[0.0%, 0.4%]	22
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.1%	[0.0%, 0.4%]	22

Bootstrap: 635.284s -> 638.1s (0.44%)
Artifact size: 304.41 MiB -> 304.38 MiB (-0.01%)

[pnkfelix]

Visiting for weekly perf triage.

• improvement here is transient noise on bitmaps and cargo.