Execute delayed lowering in a sandbox

[aerooneqq]

Not yet ready to review.

r? @petrochenkov

[petrochenkov]

@bors try @rust-timer queue

[rust-bors]

☀️ Try build successful (CI)
Build commit: 65d1474 (65d1474bf3612fdd40cb69ec815cea30b41877a2, parent: 57cb10ae1e27f54f72eb2968f6ddc8fe88b83ab5)

[rust-timer]

Finished benchmarking commit (65d1474): comparison URL.

Overall result: ❌ regressions - please read:

Benchmarking means the PR may be perf-sensitive. It's automatically marked not fit for rolling up. Overriding is possible but disadvised: it risks changing compiler perf.

Next, please: If you can, justify the regressions found in this try perf run in writing along with @rustbot label: +perf-regression-triaged. If not, fix the regressions and do another perf run. Neutral or positive results will clear the label automatically.

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

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	1.1%	[0.2%, 3.9%]	211
Regressions ❌ (secondary)	1.3%	[0.0%, 7.5%]	217
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.2%	[-0.4%, -0.0%]	5
All ❌✅ (primary)	1.1%	[0.2%, 3.9%]	211

Max RSS (memory usage)

Results (primary 7.7%, secondary 4.8%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	7.7%	[1.4%, 27.2%]	26
Regressions ❌ (secondary)	6.0%	[2.0%, 24.7%]	19
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.8%	[-3.1%, -2.6%]	3
All ❌✅ (primary)	7.7%	[1.4%, 27.2%]	26

Cycles

Results (primary 2.2%, secondary -0.0%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	2.2%	[2.2%, 2.2%]	1
Regressions ❌ (secondary)	2.5%	[1.5%, 3.5%]	7
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-5.8%	[-7.8%, -3.0%]	3
All ❌✅ (primary)	2.2%	[2.2%, 2.2%]	1

Binary size

This perf run didn't have relevant results for this metric.

Bootstrap: 489.055s -> 495.053s (1.23%)
Artifact size: 394.13 MiB -> 396.82 MiB (0.68%)

[petrochenkov]

@bors try @rust-timer queue

[rust-bors]

☀️ Try build successful (CI)
Build commit: 244e060 (244e0605b23ae6d675ed68716fa2b042282dbfb0, parent: e8e4541ff19649d95afab52fdde2c2eaa6829965)

[rust-timer]

Finished benchmarking commit (244e060): comparison URL.

Overall result: ❌✅ regressions and improvements - please read:

Benchmarking means the PR may be perf-sensitive. It's automatically marked not fit for rolling up. Overriding is possible but disadvised: it risks changing compiler perf.

Next, please: If you can, justify the regressions found in this try perf run in writing along with @rustbot label: +perf-regression-triaged. If not, fix the regressions and do another perf run. Neutral or positive results will clear the label automatically.

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

Instruction count

Our most reliable metric. Used to determine the overall result above. However, even this metric can be noisy.

	mean	range	count
Regressions ❌ (primary)	1.0%	[0.2%, 3.3%]	209
Regressions ❌ (secondary)	1.1%	[0.0%, 6.6%]	217
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.2%	[-0.3%, -0.0%]	6
All ❌✅ (primary)	1.0%	[0.2%, 3.3%]	209

Max RSS (memory usage)

Results (primary 2.5%, secondary 3.2%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	2.5%	[2.5%, 2.5%]	1
Regressions ❌ (secondary)	5.7%	[3.7%, 7.3%]	3
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.1%	[-4.1%, -4.1%]	1
All ❌✅ (primary)	2.5%	[2.5%, 2.5%]	1

Cycles

Results (secondary 0.7%)

A less reliable metric. May be of interest, but not used to determine the overall result above.

	mean	range	count
Regressions ❌ (primary)	-	-	0
Regressions ❌ (secondary)	2.9%	[1.8%, 5.0%]	13
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-4.9%	[-7.5%, -2.5%]	5
All ❌✅ (primary)	-	-	0

Binary size

This perf run didn't have relevant results for this metric.

Bootstrap: 490.756s -> 493.643s (0.59%)
Artifact size: 394.16 MiB -> 396.98 MiB (0.72%)