Only compute mir_generator_witnesses query in drop_tracking_mir mode.

[cjgillot]

Attempt to fix the perf regression in #101692

r? @ghost

[cjgillot]

@bors try @rust-timer queue

[bors]

⌛ Trying commit 4db4860 with merge 81daf123b0cd35cfc2538c4f70f984240d4c1e98...

[bors]

☀️ Try build successful - checks-actions
Build commit: 81daf123b0cd35cfc2538c4f70f984240d4c1e98 (81daf123b0cd35cfc2538c4f70f984240d4c1e98)

[rust-timer]

Finished benchmarking commit (81daf123b0cd35cfc2538c4f70f984240d4c1e98): 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)	-0.6%	[-0.6%, -0.6%]	1
Improvements ✅ (secondary)	-3.4%	[-5.7%, -0.9%]	11
All ❌✅ (primary)	-0.6%	[-0.6%, -0.6%]	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)	2.1%	[1.6%, 2.3%]	3
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-5.9%	[-5.9%, -5.9%]	1
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)	-3.4%	[-3.8%, -2.7%]	6
All ❌✅ (primary)	-	-	0

[rustbot]

Some changes occurred to MIR optimizations

cc @rust-lang/wg-mir-opt

[cjgillot]

r? compiler

[compiler-errors]

@bors r+

[bors]

📌 Commit 4db4860 has been approved by compiler-errors

It is now in the queue for this repository.

[bors]

⌛ Testing commit 4db4860 with merge bcb064a...

[bors]

☀️ Test successful - checks-actions
Approved by: compiler-errors
Pushing bcb064a to master...

[rust-timer]

Finished benchmarking commit (bcb064a): 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
Improvements ✅ (secondary)	-3.7%	[-5.7%, -1.1%]	10
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)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-2.5%	[-2.7%, -2.3%]	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)	-3.3%	[-4.8%, -2.5%]	5
All ❌✅ (primary)	-	-	0