Rollup of 5 pull requests by jhpratt · Pull Request #159498 · rust-lang/rust

jhpratt · 2026-07-18T03:33:34Z

Successful merges:

[cg_ssa] Eliminate the is_backend_{immediate,scalar_pair,ref} methods #159164 ([cg_ssa] Eliminate the is_backend_{immediate,scalar_pair,ref} methods)
add a fallback for more f16 intrinsics #159175 (add a fallback for more f16 intrinsics )
update 'allocation' docs with memory atomicity requirement #158586 (update 'allocation' docs with memory atomicity requirement)
rustc: Avoid passing jobserver proxy around the compiler #159390 (rustc: Avoid passing jobserver proxy around the compiler)
Android platform support: add links to make it easier to figure out the supported API levels #159468 (Android platform support: add links to make it easier to figure out the supported API levels)

It is used once, when marking a `rustc_thread_pool` worker thread as blocked. `rustc_thread_pool` already has access to the jobserver proxy, so we can move its use from outside of `mark_blocked` to inside of it.

- `floorf16` - `ceilf16` - `truncf16,` - `round_ties_even_f16` - `roundf16` - `powif16` - `sqrtf16` - `fmaf16`

…he supported API levels

…=workingjubilee [cg_ssa] Eliminate the `is_backend_{immediate,scalar_pair,ref}` methods These methods are just mostly just matches on [`BackendRepr`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_abi/enum.BackendRepr.html) now, which makes then not not very valuable. Notably, `cg_clif` gets along just fine without them. In general, it's much nicer to match on `BackendRepr` than to use an `if`-`else` chain of `is_zst`+`is_backend_immediate`+`is_backend_scalar_pair`. And having them be on `LayoutTypeCodegenMethods` means you need a context to use them, making it more annoying to use them in things like [`OperandValue::is_expected_variant_for_type`](https://doc.rust-lang.org/nightly/nightly-rustc/rustc_codegen_ssa/mir/operand/enum.OperandValue.html#method.is_expected_variant_for_type). So this just removes them, as well as the `is_llvm_*` and `is_gcc_*` versions. How I migrated callers: - `is_backend_ref` becomes a (logical-not-ed) call to a new `.is_ssa_standalone()` method. (Better name suggestions welcome for this one. I wanted something to hopefully phrase intent better and positively.) - `is_backend_immediate` becomes a call to `.backend_repr.is_scalar_or_simd()`. - `is_backend_scalar_pair` becomes a pattern-match against `BackendRepr::ScalarPair { .. }`. - some places that used multiples just became a match over `BackendRepr`. The intent is that this has zero impact on the codegen. It should be a refactor only. r? codegen

…, r=tgross35 add a fallback for more `f16` intrinsics tracking issue: rust-lang#116909 Add several more fallbacks for `f16` intrinsics, so that they will work on platforms without the corresponding libcalls. related - rust-lang/rustc_codegen_cranelift#1675 - rust-lang/rustc_codegen_cranelift#1674 - rust-lang#150946

@RalfJung

…s, r=RalfJung update 'allocation' docs with memory atomicity requirement r? @RalfJung As discussed [on zulip](https://rust-lang.zulipchat.com/#narrow/channel/136281-t-opsem/topic/Region-based.20Atomic.20Capabilities/near/607225972)

@nnethercote

rustc: Avoid passing jobserver proxy around the compiler It is used once, when marking a `rustc_thread_pool` worker thread as blocked. `rustc_thread_pool` already has access to the jobserver proxy, so we can move its use from outside of `mark_blocked` to inside of it. (The modified part of `rustc_thread_pool` is a rustc-specific extension, not an original rayon-core API.) This is a simpler cleanup subset of rust-lang#155997. r? @nnethercote

@Joel-Wwalker

…kang Android platform support: add links to make it easier to figure out the supported API levels @Joel-Wwalker @maurer are these the right links to put here, or are there better ones?

jhpratt · 2026-07-18T03:33:45Z

@bors r+ rollup=never p=5

rust-bors · 2026-07-18T03:33:48Z

📌 Commit 1c8bcf8 has been approved by jhpratt

It is now in the queue for this repository.

rust-bors · 2026-07-18T07:18:12Z

☀️ Test successful - CI
Approved by: jhpratt
Duration: 3h 36m 50s
Pushing b26c8ef to main...

rust-timer · 2026-07-18T07:19:42Z

📌 Perf builds for each rolled up PR:

PR#	Message	Perf Build Sha
#159164	[cg_ssa] Eliminate the `is_backend_{immediate,scalar_pair,r…	`43de552671b81b0d55a0f5091ccf3fe0b38c741b` (link)
#159175	add a fallback for more `f16` intrinsics	`b20acf3d0dee05138224d1f1e91dc314c3b57111` (link)
#158586	update 'allocation' docs with memory atomicity requirement	`d7a8bdc9ebae84fad2534051fdfd0c9baaafd5d3` (link)
#159390	rustc: Avoid passing jobserver proxy around the compiler	`130822bf7e4d8e6587d37f52e0dd1aa1fd31faeb` (link)
#159468	Android platform support: add links to make it easier to fi…	`0c7780b5e68943aeeb22b00b5e7a8ae08d3f13c9` (link)

previous master: 637236889f

In the case of a perf regression, run the following command for each PR you suspect might be the cause: @rust-timer build $SHA

github-actions · 2026-07-18T07:21:38Z

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 6372368 (parent) -> b26c8ef (this PR)

Test differences

Show 234 test diffs

234 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 b26c8ef0535b2de24a0af4048370caf449eebabd --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

i686-gnu-nopt-2: 1h 28m -> 2h 21m (+61.2%)
dist-armhf-linux: 1h 4m -> 1h 26m (+34.5%)
armhf-gnu: 1h 33m -> 1h 2m (-33.2%)
dist-i586-gnu-i586-i686-musl: 1h 15m -> 1h 39m (+30.8%)
x86_64-gnu-llvm-21: 1h 15m -> 53m 28s (-28.8%)
dist-x86_64-mingw: 2h -> 2h 35m (+28.4%)
x86_64-gnu-llvm-22-1: 59m 54s -> 1h 16m (+27.2%)
test-various: 1h 54m -> 1h 25m (-25.3%)
dist-aarch64-apple: 2h 17m -> 1h 44m (-24.2%)
x86_64-mingw-1: 2h 53m -> 2h 12m (-24.0%)

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 · 2026-07-18T07:59:50Z

Finished benchmarking commit (b26c8ef): 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%	[-0.4%, -0.3%]	3
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary 1.3%, secondary 1.4%)

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

	mean	range	count
Regressions ❌ (primary)	3.4%	[2.4%, 4.4%]	2
Regressions ❌ (secondary)	5.2%	[5.2%, 5.2%]	1
Improvements ✅ (primary)	-3.1%	[-3.1%, -3.1%]	1
Improvements ✅ (secondary)	-2.3%	[-2.3%, -2.3%]	1
All ❌✅ (primary)	1.3%	[-3.1%, 4.4%]	3

Cycles

Results (secondary -2.6%)

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)	-	-	0
Improvements ✅ (secondary)	-2.6%	[-3.3%, -2.1%]	4
All ❌✅ (primary)	-	-	0

Binary size

Results (primary 0.0%, 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)	0.1%	[0.0%, 0.1%]	4
Regressions ❌ (secondary)	0.0%	[0.0%, 0.0%]	1
Improvements ✅ (primary)	-0.0%	[-0.1%, -0.0%]	4
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	0.0%	[-0.1%, 0.1%]	8

Bootstrap: 488.864s -> 492.122s (0.67%)
Artifact size: 390.05 MiB -> 389.50 MiB (-0.14%)

scottmcm and others added 11 commits July 11, 2026 21:42

[cg_ssa] Eliminate the is_backend_{immediate,scalar_pair,ref} methods

d93df7f

rustc: Avoid passing jobserver proxy around the compiler

c60e561

It is used once, when marking a `rustc_thread_pool` worker thread as blocked. `rustc_thread_pool` already has access to the jobserver proxy, so we can move its use from outside of `mark_blocked` to inside of it.

update 'allocation' docs with memory atomicity requirement

d6f359b

add a fallback for more f16 intrinsics

7ce9176

- `floorf16` - `ceilf16` - `truncf16,` - `round_ties_even_f16` - `roundf16` - `powif16` - `sqrtf16` - `fmaf16`

add float intrinsic with fallbacks to replaced_intrinsics

da925bb

Android platform support: add links to make it easier to figure out t…

04a8f33

…he supported API levels

Rollup merge of rust-lang#159468 - RalfJung:android-support, r=chenyu…

1c8bcf8

…kang Android platform support: add links to make it easier to figure out the supported API levels @Joel-Wwalker @maurer are these the right links to put here, or are there better ones?

rust-bors Bot added the rollup A PR which is a rollup label Jul 18, 2026

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 Jul 18, 2026

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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 Jul 18, 2026

rust-bors Bot merged commit b26c8ef into rust-lang:main Jul 18, 2026
14 checks passed

rustbot added this to the 1.99.0 milestone Jul 18, 2026

This was referenced Jul 18, 2026

Emit retags in codegen to support BorrowSanitizer (part 5) #159245

Open

Add post-mono MIR optimizations #156858

Open

Break query cycles without spawning a separate thread #155927

Open

This was referenced Jul 18, 2026

Refactor query latch #155881

Open

Inline WorkerThread pointer into a thread local #155688

Open

Use horde's SyncTable for default query caches and CtxtInterners #153826

Open

Remove driver_lint_caps #152852

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Rollup of 5 pull requests#159498

Rollup of 5 pull requests#159498
rust-bors[bot] merged 11 commits into
rust-lang:mainfrom
jhpratt:rollup-vbOXcq6

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Overall result: ✅ improvements - no action needed

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