Unify and deduplicate max recip float tests

[rperier]

cc #141726

This is a proposal to unify and deduplicate max recip tests for f16 and f128

[rustbot]

r? @Mark-Simulacrum

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They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

Use r? to explicitly pick a reviewer

[rperier]

r? tgross35

[rustbot]

tgross35 is currently at their maximum review capacity.
They may take a while to respond.

[rperier]

r? rust-lang/libs

[tgross35]

Thanks for getting this going!

r? tgross35

View changes since this review

[rustbot]

This PR was rebased onto a different master commit. Here's a range-diff highlighting what actually changed.

Rebasing is a normal part of keeping PRs up to date, so no action is needed—this note is just to help reviewers.

[rperier]

@rustbot ready

[tgross35]

Thank you!
@bors r+

[bors]

📌 Commit 70876ee has been approved by tgross35

It is now in the queue for this repository.

[bors]

⌛ Testing commit 70876ee with merge e517798...

[bors]

☀️ Test successful - checks-actions
Approved by: tgross35
Pushing e517798 to master...

[github-actions]

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 cc63a0a (parent) -> e517798 (this PR)

Test differences

Show 5 test diffs

Stage 1

• floats::f16::test_max_recip: pass -> [missing] (J0)

Stage 2

• floats::f16::test_max_recip: pass -> [missing] (J1)
• floats::f128::test_max_recip: pass -> [missing] (J2)

Additionally, 2 doctest diffs were found. These are ignored, as they are noisy.

Job group index

• J0: pr-check-2, x86_64-gnu-llvm-20-3
• J1: aarch64-apple, aarch64-gnu, aarch64-gnu-llvm-20-1, aarch64-msvc-1, arm-android, armhf-gnu, dist-i586-gnu-i586-i686-musl, i686-gnu-1, i686-gnu-nopt-1, i686-msvc-1, test-various, x86_64-gnu, x86_64-gnu-aux, x86_64-gnu-llvm-20-2, x86_64-gnu-nopt, x86_64-gnu-stable, x86_64-msvc-1
• J2: aarch64-gnu, aarch64-gnu-llvm-20-1, x86_64-gnu-aux

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
    test-dashboard e5177985a5493c783d6ba20960d2723d9d2e9214 --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

1. aarch64-apple: 8557.5s -> 11071.4s (29.4%)
2. dist-aarch64-apple: 5726.1s -> 7138.3s (24.7%)
3. x86_64-gnu-tools: 3762.0s -> 3264.5s (-13.2%)
4. aarch64-gnu-debug: 4175.0s -> 3679.6s (-11.9%)
5. pr-check-1: 1681.7s -> 1486.9s (-11.6%)
6. aarch64-gnu-llvm-20-1: 3765.6s -> 3384.7s (-10.1%)
7. x86_64-gnu-gcc: 3301.1s -> 2981.3s (-9.7%)
8. x86_64-gnu-nopt: 6749.0s -> 7392.6s (9.5%)
9. x86_64-gnu-llvm-20-1: 3261.4s -> 2962.7s (-9.2%)
10. armhf-gnu: 5113.6s -> 4683.0s (-8.4%)

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]

Finished benchmarking commit (e517798): comparison URL.

Overall result: ✅ improvements - no action needed

@rustbot label: -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
Improvements ✅ (secondary)	-0.3%	[-0.6%, -0.1%]	2
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

This benchmark run did not return any relevant results for this metric.

Cycles

This benchmark run did not return any relevant results for this metric.

Binary size

This benchmark run did not return any relevant results for this metric.

Bootstrap: 475.029s -> 475.08s (0.01%)
Artifact size: 390.46 MiB -> 390.51 MiB (0.01%)