sanitizers: Implicitly disable mutually exclusive sanitizers by PiJoules · Pull Request #161953 · rust-lang/rust

PiJoules · 2026-08-28T22:56:30Z

This attempts to match clang's behavior of implicitly disabling sanitizers that are incompatible. Specifically, if a set of default sanitizers would be incompatible with ones provided by -Zsanitize=..., then clang (and now rust) will opt for keeping the ones specified via flags over the ones used as platform defaults. This helps maintain build consistency where we can just enable sanitizers via flags for both rust and c++ code without needing to manually disable others.

The driving reason for this is asan and safestack where we'd like to enable safestack by default for x86_64 fuchsia but disable it if -Zsanitize=address is passed (matching clang's behavior).

This commit also refactors all uses of self.opts.unstable_opts.sanitizer to go through the updated sanitizer() method.

AI: Gemini was used to help review the code and write some tests, but it did not generate the whole patch. I edited and reviewed this PR to the best of my ability before pushing for review.

This attempts to match clang's behavior of implicitly disabling sanitizers that are incompatible. Specifically, if a set of default sanitizers would be incompatible with ones provided by -Zsanitize=..., then clang (and now rust) will opt for keeping the ones specified via flags over the ones used as platform defaults. This helps maintain build consistency where we can just enable sanitizers via flags for both rust and c++ code without needing to manually disable others. The driving reason for this is asan and safestack where we'd like to enable safestack by default for x86_64 fuchsia but disable it if -Zsanitize=address is passed (matching clang's behavior). This commit also refactors all uses of `self.opts.unstable_opts.sanitizer` to go through the updated `sanitizer()` method. AI: Gemini was used to help review the code and write some tests, but it did not generate the whole patch. I edited and reviewed this PR to the best of my ability before pushing for review.

rustbot · 2026-08-28T22:56:34Z

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PiJoules · 2026-08-28T22:57:32Z

cc @ilovepi just in case I'm missing something here

fee1-dead · 2026-08-31T02:04:24Z

@rustbot reroll

davidtwco · 2026-09-04T13:33:30Z

@bors r+ rollup

rust-bors · 2026-09-04T13:33:34Z

📌 Commit 868bc2a has been approved by davidtwco

It is now in the queue for this repository.

…ble-sanitizers, r=davidtwco sanitizers: Implicitly disable mutually exclusive sanitizers This attempts to match clang's behavior of implicitly disabling sanitizers that are incompatible. Specifically, if a set of default sanitizers would be incompatible with ones provided by -Zsanitize=..., then clang (and now rust) will opt for keeping the ones specified via flags over the ones used as platform defaults. This helps maintain build consistency where we can just enable sanitizers via flags for both rust and c++ code without needing to manually disable others. The driving reason for this is asan and safestack where we'd like to enable safestack by default for x86_64 fuchsia but disable it if -Zsanitize=address is passed (matching clang's behavior). This commit also refactors all uses of `self.opts.unstable_opts.sanitizer` to go through the updated `sanitizer()` method. AI: Gemini was used to help review the code and write some tests, but it did not generate the whole patch. I edited and reviewed this PR to the best of my ability before pushing for review.

Rollup of 25 pull requests Successful merges: - #159074 ([PAC] FnAbi, llvm.ptrauth.resign and Session API change (2/8)) - #159792 (A more readable debug map for IndexMaps) - #161895 (std::sys::pal::sgx: fix mismatched alloc/free alignment) - #161900 (bootstrap: Include feature-gated items in bootstrap tool docs) - #161940 (Promote `wasm32-wasip3` to a tier 2 target) - #162072 (Add new Tier-3 target: `powerpc64-sony-ps3`) - #162179 (type system const items via direct rhs) - #162277 (Introduce `rustc_middle::middel::resolve`) - #162285 (box: fixup map/try_map deallocate calls) - #162286 (string: don't unwind prematurely) - #162289 (alloc: a bunch of safety comments) - #162292 (Update `askama` version to `0.16.1`) - #160509 (Remove `RegionExt`; move methods to `Region` in `rustc_type_ir`) - #160906 (Suggest usize instead of placeholder type for array length constants) - #160936 (traits: Represent live alias arguments as bitsets) - #161400 (Improve diagnostics for references to closures) - #161656 (Suggest mutable references for FnMut closure arguments) - #161711 (Add more splat fn type tests) - #161786 (Make `tcx.def_id_partial_cmp` public) - #161953 (sanitizers: Implicitly disable mutually exclusive sanitizers) - #162155 (add suggestion for `rustc_allowed_through_unstable_modules` attribute) - #162212 (Implement `Rng` for `Box`) - #162246 (Fix incorrect meta span) - #162266 (std: fix typo) - #162291 (Add regression test from 1.98.1)

…ble-sanitizers, r=davidtwco sanitizers: Implicitly disable mutually exclusive sanitizers This attempts to match clang's behavior of implicitly disabling sanitizers that are incompatible. Specifically, if a set of default sanitizers would be incompatible with ones provided by -Zsanitize=..., then clang (and now rust) will opt for keeping the ones specified via flags over the ones used as platform defaults. This helps maintain build consistency where we can just enable sanitizers via flags for both rust and c++ code without needing to manually disable others. The driving reason for this is asan and safestack where we'd like to enable safestack by default for x86_64 fuchsia but disable it if -Zsanitize=address is passed (matching clang's behavior). This commit also refactors all uses of `self.opts.unstable_opts.sanitizer` to go through the updated `sanitizer()` method. AI: Gemini was used to help review the code and write some tests, but it did not generate the whole patch. I edited and reviewed this PR to the best of my ability before pushing for review.

Rollup of 25 pull requests Successful merges: - #159074 ([PAC] FnAbi, llvm.ptrauth.resign and Session API change (2/8)) - #159792 (A more readable debug map for IndexMaps) - #160745 (make closures act like MaybeDangling) - #161895 (std::sys::pal::sgx: fix mismatched alloc/free alignment) - #161940 (Promote `wasm32-wasip3` to a tier 2 target) - #162072 (Add new Tier-3 target: `powerpc64-sony-ps3`) - #162179 (type system const items via direct rhs) - #162277 (Introduce `rustc_middle::middel::resolve`) - #162285 (box: fixup map/try_map deallocate calls) - #162286 (string: don't unwind prematurely) - #162289 (alloc: a bunch of safety comments) - #162292 (Update `askama` version to `0.16.1`) - #160509 (Remove `RegionExt`; move methods to `Region` in `rustc_type_ir`) - #160906 (Suggest usize instead of placeholder type for array length constants) - #160936 (traits: Represent live alias arguments as bitsets) - #161400 (Improve diagnostics for references to closures) - #161656 (Suggest mutable references for FnMut closure arguments) - #161711 (Add more splat fn type tests) - #161786 (Make `tcx.def_id_partial_cmp` public) - #161953 (sanitizers: Implicitly disable mutually exclusive sanitizers) - #162155 (add suggestion for `rustc_allowed_through_unstable_modules` attribute) - #162212 (Implement `Rng` for `Box`) - #162246 (Fix incorrect meta span) - #162266 (std: fix typo) - #162291 (Add regression test from 1.98.1)

…ble-sanitizers, r=davidtwco sanitizers: Implicitly disable mutually exclusive sanitizers This attempts to match clang's behavior of implicitly disabling sanitizers that are incompatible. Specifically, if a set of default sanitizers would be incompatible with ones provided by -Zsanitize=..., then clang (and now rust) will opt for keeping the ones specified via flags over the ones used as platform defaults. This helps maintain build consistency where we can just enable sanitizers via flags for both rust and c++ code without needing to manually disable others. The driving reason for this is asan and safestack where we'd like to enable safestack by default for x86_64 fuchsia but disable it if -Zsanitize=address is passed (matching clang's behavior). This commit also refactors all uses of `self.opts.unstable_opts.sanitizer` to go through the updated `sanitizer()` method. AI: Gemini was used to help review the code and write some tests, but it did not generate the whole patch. I edited and reviewed this PR to the best of my ability before pushing for review.

Rollup of 27 pull requests Successful merges: - #159074 ([PAC] FnAbi, llvm.ptrauth.resign and Session API change (2/8)) - #159792 (A more readable debug map for IndexMaps) - #160745 (make closures act like MaybeDangling) - #161940 (Promote `wasm32-wasip3` to a tier 2 target) - #162030 (Prevent `--test` to be used in `rustdoc-html` testsuite) - #162072 (Add new Tier-3 target: `powerpc64-sony-ps3`) - #162179 (type system const items via direct rhs) - #162262 (Avoid manually instantiating some binders in error reporting with `-Znext-solver`) - #162277 (Introduce `rustc_middle::middel::resolve`) - #162285 (box: fixup map/try_map deallocate calls) - #162286 (string: don't unwind prematurely) - #162289 (alloc: a bunch of safety comments) - #162290 (abby test DSL: AliasTyOutlivesViaEnv) - #162292 (Update `askama` version to `0.16.1`) - #160509 (Remove `RegionExt`; move methods to `Region` in `rustc_type_ir`) - #160906 (Suggest usize instead of placeholder type for array length constants) - #160936 (traits: Represent live alias arguments as bitsets) - #161400 (Improve diagnostics for references to closures) - #161656 (Suggest mutable references for FnMut closure arguments) - #161711 (Add more splat fn type tests) - #161786 (Make `tcx.def_id_partial_cmp` public) - #161953 (sanitizers: Implicitly disable mutually exclusive sanitizers) - #162155 (add suggestion for `rustc_allowed_through_unstable_modules` attribute) - #162212 (Implement `Rng` for `Box`) - #162246 (Fix incorrect meta span) - #162266 (std: fix typo) - #162291 (Add regression test from 1.98.1)

…uwer Rollup of 25 pull requests Successful merges: - #162072 (Add new Tier-3 target: `powerpc64-sony-ps3`) - #162179 (type system const items via direct rhs) - #162255 (let people change rustc-dev-guide in-tree) - #162262 (Avoid manually instantiating some binders in error reporting with `-Znext-solver`) - #162277 (Introduce `rustc_middle::middel::resolve`) - #162285 (box: fixup map/try_map deallocate calls) - #162286 (string: don't unwind prematurely) - #162289 (alloc: a bunch of safety comments) - #162290 (abby test DSL: AliasTyOutlivesViaEnv) - #162292 (Update `askama` version to `0.16.1`) - #160509 (Remove `RegionExt`; move methods to `Region` in `rustc_type_ir`) - #160906 (Suggest usize instead of placeholder type for array length constants) - #160936 (traits: Represent live alias arguments as bitsets) - #161394 (fix `is_homogeneous_aggregate`: use unit size, not total size ) - #161400 (Improve diagnostics for references to closures) - #161656 (Suggest mutable references for FnMut closure arguments) - #161711 (Add more splat fn type tests) - #161786 (Make `tcx.def_id_partial_cmp` public) - #161953 (sanitizers: Implicitly disable mutually exclusive sanitizers) - #162155 (add suggestion for `rustc_allowed_through_unstable_modules` attribute) - #162212 (Implement `Rng` for `Box`) - #162246 (Fix incorrect meta span) - #162266 (std: fix typo) - #162291 (Add regression test from 1.98.1) - #162303 (Fix a minor spelling error in `library/std/src/sys/fs/unix.rs`)

…ble-sanitizers, r=davidtwco sanitizers: Implicitly disable mutually exclusive sanitizers This attempts to match clang's behavior of implicitly disabling sanitizers that are incompatible. Specifically, if a set of default sanitizers would be incompatible with ones provided by -Zsanitize=..., then clang (and now rust) will opt for keeping the ones specified via flags over the ones used as platform defaults. This helps maintain build consistency where we can just enable sanitizers via flags for both rust and c++ code without needing to manually disable others. The driving reason for this is asan and safestack where we'd like to enable safestack by default for x86_64 fuchsia but disable it if -Zsanitize=address is passed (matching clang's behavior). This commit also refactors all uses of `self.opts.unstable_opts.sanitizer` to go through the updated `sanitizer()` method. AI: Gemini was used to help review the code and write some tests, but it did not generate the whole patch. I edited and reviewed this PR to the best of my ability before pushing for review.

…uwer Rollup of 25 pull requests Successful merges: - #162072 (Add new Tier-3 target: `powerpc64-sony-ps3`) - #162179 (type system const items via direct rhs) - #162255 (let people change rustc-dev-guide in-tree) - #162262 (Avoid manually instantiating some binders in error reporting with `-Znext-solver`) - #162277 (Introduce `rustc_middle::middel::resolve`) - #162285 (box: fixup map/try_map deallocate calls) - #162286 (string: don't unwind prematurely) - #162289 (alloc: a bunch of safety comments) - #162290 (abby test DSL: AliasTyOutlivesViaEnv) - #162292 (Update `askama` version to `0.16.1`) - #160509 (Remove `RegionExt`; move methods to `Region` in `rustc_type_ir`) - #160906 (Suggest usize instead of placeholder type for array length constants) - #160936 (traits: Represent live alias arguments as bitsets) - #161394 (fix `is_homogeneous_aggregate`: use unit size, not total size ) - #161400 (Improve diagnostics for references to closures) - #161656 (Suggest mutable references for FnMut closure arguments) - #161711 (Add more splat fn type tests) - #161786 (Make `tcx.def_id_partial_cmp` public) - #161953 (sanitizers: Implicitly disable mutually exclusive sanitizers) - #162155 (add suggestion for `rustc_allowed_through_unstable_modules` attribute) - #162212 (Implement `Rng` for `Box`) - #162246 (Fix incorrect meta span) - #162266 (std: fix typo) - #162291 (Add regression test from 1.98.1) - #162303 (Fix a minor spelling error in `library/std/src/sys/fs/unix.rs`)

Rollup merge of #161953 - PiJoules:implicit-remove-incompatible-sanitizers, r=davidtwco sanitizers: Implicitly disable mutually exclusive sanitizers This attempts to match clang's behavior of implicitly disabling sanitizers that are incompatible. Specifically, if a set of default sanitizers would be incompatible with ones provided by -Zsanitize=..., then clang (and now rust) will opt for keeping the ones specified via flags over the ones used as platform defaults. This helps maintain build consistency where we can just enable sanitizers via flags for both rust and c++ code without needing to manually disable others. The driving reason for this is asan and safestack where we'd like to enable safestack by default for x86_64 fuchsia but disable it if -Zsanitize=address is passed (matching clang's behavior). This commit also refactors all uses of `self.opts.unstable_opts.sanitizer` to go through the updated `sanitizer()` method. AI: Gemini was used to help review the code and write some tests, but it did not generate the whole patch. I edited and reviewed this PR to the best of my ability before pushing for review.

rust-timer · 2026-09-06T11:38:39Z

Note

This PR was benchmarked as part of triage of its containing rollup: triage URL.

Finished benchmarking commit (18b0b44): comparison URL.

Overall result: ❌ regressions - please read:

Our benchmarks found a performance regression caused by this PR.
This might be an actual regression, but it can also be just noise.

Next Steps:

If the regression was expected or you think it can be justified,
please write a comment with sufficient written justification, and add
@rustbot label: +perf-regression-triaged to it, to mark the regression as triaged.
If you think that you know of a way to resolve the regression, try to create
a new PR with a fix for the regression.
If you do not understand the regression or you think that it is just noise,
you can ask the @rust-lang/wg-compiler-performance working group for help (members of this group
were already notified of this PR).

@rustbot label: +perf-regression
cc @rust-lang/wg-compiler-performance

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)	1.3%	[0.2%, 2.7%]	32
Regressions ❌ (secondary)	1.5%	[0.2%, 5.5%]	40
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	1.3%	[0.2%, 2.7%]	32

Max RSS (memory usage)

Results (primary -7.3%)

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)	-	-	0
Improvements ✅ (primary)	-7.3%	[-11.6%, -2.9%]	2
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-7.3%	[-11.6%, -2.9%]	2

Cycles

Results (secondary 3.9%)

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)	3.9%	[2.9%, 5.1%]	5
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-	-	0

Binary size

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

Bootstrap: missing data
Artifact size: 403.29 MiB -> 403.31 MiB (0.01%)

JonathanBrouwer · 2026-09-06T11:50:09Z

This caused a performance regression, which is quite surprising to me.
Any idea what caused this? @PiJoules

Kobzol · 2026-09-06T12:43:47Z

The sanitizers() function before just did a single bitor. Now it iterates over an array and performs a bunch of computation. It is called by the fewer_names function, which is called a lot during compilation, e.g. when determining the address of each global or the LLVM type of each type. Let's try caching it: #162371

Cache sanitizer set in `Session` Trying to address the perf. regression from #161953.

Cache sanitizer set in `Session` Trying to address the perf. regression from rust-lang/rust#161953.

…uwer Rollup of 25 pull requests Successful merges: - rust-lang/rust#162072 (Add new Tier-3 target: `powerpc64-sony-ps3`) - rust-lang/rust#162179 (type system const items via direct rhs) - rust-lang/rust#162255 (let people change rustc-dev-guide in-tree) - rust-lang/rust#162262 (Avoid manually instantiating some binders in error reporting with `-Znext-solver`) - rust-lang/rust#162277 (Introduce `rustc_middle::middel::resolve`) - rust-lang/rust#162285 (box: fixup map/try_map deallocate calls) - rust-lang/rust#162286 (string: don't unwind prematurely) - rust-lang/rust#162289 (alloc: a bunch of safety comments) - rust-lang/rust#162290 (abby test DSL: AliasTyOutlivesViaEnv) - rust-lang/rust#162292 (Update `askama` version to `0.16.1`) - rust-lang/rust#160509 (Remove `RegionExt`; move methods to `Region` in `rustc_type_ir`) - rust-lang/rust#160906 (Suggest usize instead of placeholder type for array length constants) - rust-lang/rust#160936 (traits: Represent live alias arguments as bitsets) - rust-lang/rust#161394 (fix `is_homogeneous_aggregate`: use unit size, not total size ) - rust-lang/rust#161400 (Improve diagnostics for references to closures) - rust-lang/rust#161656 (Suggest mutable references for FnMut closure arguments) - rust-lang/rust#161711 (Add more splat fn type tests) - rust-lang/rust#161786 (Make `tcx.def_id_partial_cmp` public) - rust-lang/rust#161953 (sanitizers: Implicitly disable mutually exclusive sanitizers) - rust-lang/rust#162155 (add suggestion for `rustc_allowed_through_unstable_modules` attribute) - rust-lang/rust#162212 (Implement `Rng` for `Box`) - rust-lang/rust#162246 (Fix incorrect meta span) - rust-lang/rust#162266 (std: fix typo) - rust-lang/rust#162291 (Add regression test from 1.98.1) - rust-lang/rust#162303 (Fix a minor spelling error in `library/std/src/sys/fs/unix.rs`)

Kobzol · 2026-09-07T06:15:10Z

Perf. regression fixed by #162371.

@rustbot label: +perf-regression-triaged

…uwer Rollup of 25 pull requests Successful merges: - rust-lang/rust#162072 (Add new Tier-3 target: `powerpc64-sony-ps3`) - rust-lang/rust#162179 (type system const items via direct rhs) - rust-lang/rust#162255 (let people change rustc-dev-guide in-tree) - rust-lang/rust#162262 (Avoid manually instantiating some binders in error reporting with `-Znext-solver`) - rust-lang/rust#162277 (Introduce `rustc_middle::middel::resolve`) - rust-lang/rust#162285 (box: fixup map/try_map deallocate calls) - rust-lang/rust#162286 (string: don't unwind prematurely) - rust-lang/rust#162289 (alloc: a bunch of safety comments) - rust-lang/rust#162290 (abby test DSL: AliasTyOutlivesViaEnv) - rust-lang/rust#162292 (Update `askama` version to `0.16.1`) - rust-lang/rust#160509 (Remove `RegionExt`; move methods to `Region` in `rustc_type_ir`) - rust-lang/rust#160906 (Suggest usize instead of placeholder type for array length constants) - rust-lang/rust#160936 (traits: Represent live alias arguments as bitsets) - rust-lang/rust#161394 (fix `is_homogeneous_aggregate`: use unit size, not total size ) - rust-lang/rust#161400 (Improve diagnostics for references to closures) - rust-lang/rust#161656 (Suggest mutable references for FnMut closure arguments) - rust-lang/rust#161711 (Add more splat fn type tests) - rust-lang/rust#161786 (Make `tcx.def_id_partial_cmp` public) - rust-lang/rust#161953 (sanitizers: Implicitly disable mutually exclusive sanitizers) - rust-lang/rust#162155 (add suggestion for `rustc_allowed_through_unstable_modules` attribute) - rust-lang/rust#162212 (Implement `Rng` for `Box`) - rust-lang/rust#162246 (Fix incorrect meta span) - rust-lang/rust#162266 (std: fix typo) - rust-lang/rust#162291 (Add regression test from 1.98.1) - rust-lang/rust#162303 (Fix a minor spelling error in `library/std/src/sys/fs/unix.rs`)

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 Aug 28, 2026

rustbot assigned fee1-dead Aug 28, 2026

rustbot assigned davidtwco and unassigned fee1-dead Aug 31, 2026

davidtwco approved these changes Sep 4, 2026

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rust-bors Bot 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 Sep 4, 2026

GuillaumeGomez mentioned this pull request Sep 4, 2026

Rollup of 25 pull requests #162297

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Rollup of 25 pull requests #162298

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GuillaumeGomez mentioned this pull request Sep 4, 2026

Rollup of 25 pull requests #162300

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Rollup of 28 pull requests #162307

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Rollup of 27 pull requests #162308

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Rollup of 25 pull requests #162310

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Rollup of 20 pull requests #162317

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rust-bors Bot merged commit 5c953a1 into rust-lang:main Sep 5, 2026
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rustbot added this to the 1.100.0 milestone Sep 5, 2026

rustbot added the perf-regression Performance regression. label Sep 6, 2026

Kobzol mentioned this pull request Sep 6, 2026

Cache sanitizer set in Session #162371

Merged

rust-bors Bot pushed a commit that referenced this pull request Sep 7, 2026

Auto merge of #162371 - Kobzol:sanitizers-cache, r=hanna-kruppe

32d94cc

Cache sanitizer set in `Session` Trying to address the perf. regression from #161953.

github-actions Bot pushed a commit to rust-lang/rustc-dev-guide that referenced this pull request Sep 7, 2026

Auto merge of #162371 - Kobzol:sanitizers-cache, r=hanna-kruppe

7cbd4c9

Cache sanitizer set in `Session` Trying to address the perf. regression from rust-lang/rust#161953.

rustbot added the perf-regression-triaged The performance regression has been triaged. label Sep 7, 2026

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sanitizers: Implicitly disable mutually exclusive sanitizers - #161953

sanitizers: Implicitly disable mutually exclusive sanitizers#161953
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Overall result: ❌ regressions - please read:

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