Implement `Debug` for C-like enums with a concatenated string by makai410 · Pull Request #155452 · rust-lang/rust

makai410 · 2026-04-17T16:41:46Z

This optimizes the expansion of derive(Debug) for C-like enums with 10 or more variants to:

fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result {
    const __NAMES: &str =
        "AAAAABBBBCCDDDDDDDDEFFFFFFFFFFFFFGGGGGGHatsuneIIIIIIIJJJJJJJJJ";
    const __OFFSET: [usize; 11] =
        [0usize, 5usize, 9usize, 11usize, 19usize, 20usize, 33usize,
                39usize, 46usize, 53usize, 62usize];
    let __d = ::core::intrinsics::discriminant_value(self) as usize;
    ::core::fmt::Formatter::debug_c_like_enum_write_str(f, __NAMES,
        &__OFFSET, __d)
}

The number 10 was decided based on both the rustc perf result and the results from the dedicated perf tool for this scenario:

See https://codeberg.org/makai410/debug-fmt-perf for more details.

r? @ghost (I want to see the perf first)

rustbot · 2026-04-17T16:41:49Z

Changes to the code generated for builtin derived traits.

cc @nnethercote

makai410 · 2026-04-17T23:35:03Z

@bors try @rust-timer queue

Implement `Debug` for C-like enums with a concatenated string

rust-bors · 2026-04-18T01:44:10Z

☀️ Try build successful (CI)
Build commit: 5a131e3 (5a131e34e34187b36455f6f6809f9cd14e7ab55f, parent: e9e32aca5a4ffd08cbc29547b039d64b92a2c03b)

rust-timer · 2026-04-18T02:25:02Z

Finished benchmarking commit (5a131e3): 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)	0.4%	[0.2%, 2.4%]	50
Regressions ❌ (secondary)	0.9%	[0.2%, 1.6%]	9
Improvements ✅ (primary)	-0.4%	[-0.4%, -0.4%]	1
Improvements ✅ (secondary)	-0.0%	[-0.0%, -0.0%]	2
All ❌✅ (primary)	0.4%	[-0.4%, 2.4%]	51

Max RSS (memory usage)

Results (primary -3.6%, 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)	-	-	0
Regressions ❌ (secondary)	2.6%	[1.2%, 6.0%]	5
Improvements ✅ (primary)	-3.6%	[-5.4%, -2.5%]	4
Improvements ✅ (secondary)	-4.4%	[-6.3%, -1.6%]	3
All ❌✅ (primary)	-3.6%	[-5.4%, -2.5%]	4

Cycles

Results (primary 2.8%, secondary 2.1%)

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

	mean	range	count
Regressions ❌ (primary)	2.8%	[2.8%, 2.8%]	1
Regressions ❌ (secondary)	2.1%	[2.1%, 2.1%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	2.8%	[2.8%, 2.8%]	1

Binary size

Results (primary 0.4%, 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)	0.5%	[0.0%, 1.4%]	26
Regressions ❌ (secondary)	0.7%	[0.1%, 1.1%]	8
Improvements ✅ (primary)	-0.7%	[-1.1%, -0.3%]	2
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.4%	[-1.1%, 1.4%]	28

Bootstrap: 492.421s -> 491.503s (-0.19%)
Artifact size: 394.25 MiB -> 394.27 MiB (0.01%)

makai410 · 2026-04-18T11:38:53Z

There was a leftover condition from an earlier PR that I pulled in without a proper review, such that it actually didn't apply the optimization to large enums <_<;

I also want to try skipping bounds checks. I suppose it could improve runtime performance, at least on my machine, based on some pretty rough benchmarks with an enum of 10,000 variants.

makai410 · 2026-04-18T13:01:56Z

@bors try @rust-timer queue

Implement `Debug` for C-like enums with a concatenated string

nnethercote · 2026-04-18T13:07:14Z

I'm happy to review this once it's ready.

@rustbot author

makai410 · 2026-04-18T14:31:19Z

+    let variant_names = def
+        .variants
+        .iter()
+        .map(|v| v.disr_expr.is_none().then_some(v.ident.name.as_str()))
+        .collect::<Option<ThinVec<_>>>()?;


Hmmm, I think I missed a valid case, considering:

enum Uwu { QwQ = 0, AwA = 1, }

which has explicit discriminants but is actually dense.

View changes since the review

Also, we can use an offset when some variants have negative discriminants while the overall variants remain dense.

I'll do a follow-up PR to implement these.

rust-bors · 2026-04-18T15:08:53Z

☀️ Try build successful (CI)
Build commit: 7348f26 (7348f264e27b4bbcab21ed426532865b98fc5f55, parent: 8da2d28cbd5a4e2b93e028e709afe09541671663)

rust-timer · 2026-04-18T15:49:32Z

Finished benchmarking commit (7348f26): 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)	0.5%	[0.2%, 7.1%]	50
Regressions ❌ (secondary)	1.2%	[0.2%, 4.1%]	12
Improvements ✅ (primary)	-0.6%	[-0.6%, -0.6%]	2
Improvements ✅ (secondary)	-0.2%	[-0.5%, -0.0%]	13
All ❌✅ (primary)	0.5%	[-0.6%, 7.1%]	52

Max RSS (memory usage)

Results (primary 0.7%, secondary 0.6%)

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

	mean	range	count
Regressions ❌ (primary)	3.2%	[1.8%, 6.9%]	5
Regressions ❌ (secondary)	2.4%	[0.8%, 6.1%]	10
Improvements ✅ (primary)	-5.6%	[-7.2%, -3.9%]	2
Improvements ✅ (secondary)	-5.6%	[-6.3%, -4.8%]	3
All ❌✅ (primary)	0.7%	[-7.2%, 6.9%]	7

Cycles

Results (primary 4.4%, 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)	4.4%	[4.4%, 4.4%]	1
Regressions ❌ (secondary)	3.2%	[1.8%, 5.1%]	3
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	4.4%	[4.4%, 4.4%]	1

Binary size

Results (primary 0.4%, secondary 1.0%)

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

	mean	range	count
Regressions ❌ (primary)	0.6%	[0.1%, 1.5%]	20
Regressions ❌ (secondary)	1.0%	[0.1%, 2.1%]	20
Improvements ✅ (primary)	-0.3%	[-0.5%, -0.0%]	8
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.4%	[-0.5%, 1.5%]	28

Bootstrap: 493.313s -> 504.472s (2.26%)
Artifact size: 394.36 MiB -> 394.34 MiB (-0.01%)

theemathas · 2026-04-18T15:59:30Z

This will probably run into #148423. Furthermore, I believe this is likely to cause unsoundness in actual programs, due to the enumflags2 crate which I think has a macro that modifies the discriminant values of enums.

hanna-kruppe · 2026-07-25T16:02:10Z

@bors try @rust-timer queue

Implement `Debug` for C-like enums with a concatenated string

rust-bors · 2026-07-25T18:07:56Z

☀️ Try build successful (CI)
Build commit: b5d9a4c (b5d9a4ca70a16905acc6881bb36b6fc5aae504f2)
Base parent: da86f4d (da86f4d0726be475afbbffe40cb2f65741c51ad3)

rust-timer · 2026-07-25T18:48:23Z

Finished benchmarking commit (b5d9a4c): comparison URL.

Overall result: ✅ improvements - no action needed

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.

@bors rollup=never rustc-perf
@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)	-	-	0
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-0.7%	[-0.7%, -0.7%]	1
Improvements ✅ (secondary)	-0.4%	[-0.6%, -0.2%]	12
All ❌✅ (primary)	-0.7%	[-0.7%, -0.7%]	1

Max RSS (memory usage)

Results (primary 4.2%, secondary 5.8%)

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

	mean	range	count
Regressions ❌ (primary)	4.2%	[4.2%, 4.2%]	1
Regressions ❌ (secondary)	5.8%	[5.8%, 5.8%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	4.2%	[4.2%, 4.2%]	1

Cycles

Results (primary 2.8%)

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

	mean	range	count
Regressions ❌ (primary)	2.8%	[2.8%, 2.8%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	2.8%	[2.8%, 2.8%]	1

Binary size

Results (primary 0.1%, secondary 1.2%)

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

	mean	range	count
Regressions ❌ (primary)	0.7%	[0.5%, 0.9%]	8
Regressions ❌ (secondary)	1.2%	[0.4%, 1.8%]	14
Improvements ✅ (primary)	-0.2%	[-0.5%, -0.1%]	14
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.1%	[-0.5%, 0.9%]	22

Bootstrap: 489.287s -> 489.11s (-0.04%)
Artifact size: 387.73 MiB -> 387.61 MiB (-0.03%)

makai410 · 2026-07-30T09:32:10Z

@rustbot ready

nnethercote

I'm happy for this to be merged, but we should keep an eye out for any problems of the kind described in #148423.

View changes since this review

nnethercote · 2026-08-02T22:31:36Z

@bors r+

rust-bors · 2026-08-02T22:31:39Z

📌 Commit 5d12b9b has been approved by nnethercote

It is now in the queue for this repository.

rust-bors · 2026-08-03T02:23:54Z

☀️ Test successful - CI
Approved by: nnethercote
Duration: 3h 7m 24s
Pushing 22057b8 to main...

github-actions · 2026-08-03T02:27:13Z

What is this?

This is an experimental post-merge analysis report that shows differences in test outcomes between the merged PR and its parent PR.

Comparing 11177f2 (parent) -> 22057b8 (this PR)

Test differences

Show 22 test diffs

22 doctest diffs were found. These are ignored, as they are noisy.

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard 22057b88b091743bc0fd8d592a9264f0a6951403 --output-dir test-dashboard

And then open test-dashboard/index.html in your browser to see an overview of all executed tests.

Job duration changes

test-various: 1h 17m -> 2h 19m (+79.1%)
x86_64-gnu-gcc: 46m 39s -> 1h 11m (+53.4%)
dist-loongarch64-linux: 1h 21m -> 1h 55m (+41.1%)
tidy: 4m 8s -> 2m 40s (-35.5%)
dist-x86_64-netbsd: 1h 6m -> 1h 29m (+35.4%)
x86_64-gnu-llvm-21: 39m 51s -> 53m 3s (+33.1%)
dist-x86_64-illumos: 1h 25m -> 1h 52m (+31.9%)
x86_64-gnu: 2h 34m -> 1h 49m (-29.1%)
dist-x86_64-mingw: 2h 8m -> 2h 44m (+28.6%)
dist-armv7-linux: 1h 11m -> 1h 31m (+27.6%)

How to interpret the job duration changes?

Job durations can vary a lot, based on the actual runner instance
that executed the job, system noise, invalidated caches, etc. The table above is provided
mostly for t-infra members, for simpler debugging of potential CI slow-downs.

rust-timer · 2026-08-03T03:06:57Z

Finished benchmarking commit (22057b8): comparison URL.

Overall result: ❌✅ regressions and improvements - 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)	0.7%	[0.7%, 0.7%]	1
Regressions ❌ (secondary)	-	-	0
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.4%	[-0.7%, -0.2%]	13
All ❌✅ (primary)	0.7%	[0.7%, 0.7%]	1

Max RSS (memory usage)

Results (primary 1.3%, secondary 0.2%)

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

	mean	range	count
Regressions ❌ (primary)	3.9%	[1.2%, 6.4%]	3
Regressions ❌ (secondary)	2.4%	[1.7%, 3.1%]	2
Improvements ✅ (primary)	-1.2%	[-2.2%, -0.5%]	3
Improvements ✅ (secondary)	-0.7%	[-1.4%, -0.5%]	5
All ❌✅ (primary)	1.3%	[-2.2%, 6.4%]	6

Cycles

Results (primary -0.2%, secondary 0.6%)

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

	mean	range	count
Regressions ❌ (primary)	1.0%	[0.4%, 2.1%]	5
Regressions ❌ (secondary)	1.9%	[0.4%, 3.9%]	12
Improvements ✅ (primary)	-1.0%	[-3.3%, -0.5%]	7
Improvements ✅ (secondary)	-1.5%	[-4.0%, -0.4%]	8
All ❌✅ (primary)	-0.2%	[-3.3%, 2.1%]	12

Binary size

Results (primary 0.1%, secondary 1.2%)

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

	mean	range	count
Regressions ❌ (primary)	0.5%	[0.1%, 0.9%]	12
Regressions ❌ (secondary)	1.2%	[0.4%, 1.8%]	14
Improvements ✅ (primary)	-0.2%	[-0.4%, -0.0%]	17
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.1%	[-0.4%, 0.9%]	29

Bootstrap: 489.287s -> 490.286s (0.20%)
Artifact size: 390.32 MiB -> 390.24 MiB (-0.02%)

@ghost

Implement `Debug` for C-like enums with a concatenated string Fixes: rust-lang/rust#133945 Related to: rust-lang/rust#88793 rust-lang/rust#114106 Continuation of: rust-lang/rust#109615 rust-lang/rust#114190 This optimizes the expansion of `derive(Debug)` for C-like enums with 10 or more variants to: ```rust fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result { const __NAMES: &str = "AAAAABBBBCCDDDDDDDDEFFFFFFFFFFFFFGGGGGGHatsuneIIIIIIIJJJJJJJJJ"; const __OFFSET: [usize; 11] = [0usize, 5usize, 9usize, 11usize, 19usize, 20usize, 33usize, 39usize, 46usize, 53usize, 62usize]; let __d = ::core::intrinsics::discriminant_value(self) as usize; ::core::fmt::Formatter::debug_c_like_enum_write_str(f, __NAMES, &__OFFSET, __d) } ``` The number 10 was decided based on both [the rustc perf result](rust-lang/rust#155452 (comment)) and the results from the dedicated perf tool for this scenario: <img width="1920" height="1280" alt="chart-link" src="https://github.com/user-attachments/assets/1327ee63-ce05-482b-a1fd-c56e919250ea" /> <img width="1920" height="1280" alt="chart-obj" src="https://github.com/user-attachments/assets/1cb831d3-c9dc-469f-b87d-03cf633f8335" /> See https://codeberg.org/makai410/debug-fmt-perf for more details. r? @ghost (I want to see the perf first)

panstromek · 2026-08-03T18:30:40Z

perf triage:

cranelift-codegen regression is probably unrelated, because it wasn't present in the pre-merge results (it was actually an improvement there). Looks like a codegen unit scheduling change, based on the graph.

@rustbot label: +perf-regression-triaged

@ghost

Implement `Debug` for C-like enums with a concatenated string Fixes: rust-lang/rust#133945 Related to: rust-lang/rust#88793 rust-lang/rust#114106 Continuation of: rust-lang/rust#109615 rust-lang/rust#114190 This optimizes the expansion of `derive(Debug)` for C-like enums with 10 or more variants to: ```rust fn fmt(&self, f: &mut ::core::fmt::Formatter) -> ::core::fmt::Result { const __NAMES: &str = "AAAAABBBBCCDDDDDDDDEFFFFFFFFFFFFFGGGGGGHatsuneIIIIIIIJJJJJJJJJ"; const __OFFSET: [usize; 11] = [0usize, 5usize, 9usize, 11usize, 19usize, 20usize, 33usize, 39usize, 46usize, 53usize, 62usize]; let __d = ::core::intrinsics::discriminant_value(self) as usize; ::core::fmt::Formatter::debug_c_like_enum_write_str(f, __NAMES, &__OFFSET, __d) } ``` The number 10 was decided based on both [the rustc perf result](rust-lang/rust#155452 (comment)) and the results from the dedicated perf tool for this scenario: <img width="1920" height="1280" alt="chart-link" src="https://github.com/user-attachments/assets/1327ee63-ce05-482b-a1fd-c56e919250ea" /> <img width="1920" height="1280" alt="chart-obj" src="https://github.com/user-attachments/assets/1cb831d3-c9dc-469f-b87d-03cf633f8335" /> See https://codeberg.org/makai410/debug-fmt-perf for more details. r? @ghost (I want to see the perf first)

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 Apr 17, 2026

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Auto merge of #155452 - makai410:enum-debug-array, r=<try>

5a131e3

Implement `Debug` for C-like enums with a concatenated string

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rustbot added perf-regression Performance regression. and removed S-waiting-on-perf Status: Waiting on a perf run to be completed. labels Apr 18, 2026

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Auto merge of #155452 - makai410:enum-debug-array, r=<try>

7348f26

Implement `Debug` for C-like enums with a concatenated string

rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Apr 18, 2026

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rust-bors Bot pushed a commit that referenced this pull request Jul 25, 2026

Auto merge of #155452 - makai410:enum-debug-array, r=<try>

b5d9a4c

Implement `Debug` for C-like enums with a concatenated string

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rust-bors Bot added merged-by-bors This PR was explicitly merged by bors. and removed S-waiting-on-bors Status: Waiting on bors to run and complete tests. Bors will change the label on completion. labels Aug 3, 2026

rust-bors Bot merged commit 22057b8 into rust-lang:main Aug 3, 2026
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rustbot added this to the 1.99.0 milestone Aug 3, 2026

rustbot added the perf-regression Performance regression. label Aug 3, 2026

rustbot added the perf-regression-triaged The performance regression has been triaged. label Aug 3, 2026

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

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

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rust-bors Bot commented Jul 25, 2026

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rust-timer commented Jul 25, 2026

Overall result: ✅ improvements - no action needed

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makai410 commented Jul 30, 2026

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nnethercote commented Aug 2, 2026

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rust-bors Bot commented Aug 3, 2026

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github-actions Bot commented Aug 3, 2026

Test differences

Job duration changes

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rust-timer commented Aug 3, 2026

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

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panstromek commented Aug 3, 2026

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makai410 commented Apr 17, 2026 •

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