Rollup of 7 pull requests by jhpratt · Pull Request #155175 · rust-lang/rust

jhpratt · 2026-04-12T01:12:24Z

Successful merges:

Initial functions to start on transmute v2 #155084 (Initial functions to start on transmute v2)
add cfg(target_object_format = "...") #155126 (add cfg(target_object_format = "..."))
Portable SIMD subtree update #155165 (Portable SIMD subtree update)
fix spurious test failure in metadata_access_times #153871 (fix spurious test failure in metadata_access_times)
replace <name> @ ty::AliasTy matches with just using args: <name>_args #155150 (replace @ ty::AliasTy matches with just using args: _args)
Fix min-specialization ICE from ignored region resolution failure #155159 (Fix min-specialization ICE from ignored region resolution failure)
Reduce size of ImportData #155167 (Reduce size of ImportData)

Add basic triagebot configuration

Add `Select` and `ToBytes` to prelude

…r-default docs(simd): fix `load_select_or_default` documentation

- beginners-guide.md: fix missing letter ("within you" → "within your") - .github/PULL_REQUEST_TEMPLATE.md: remove duplicate word ("tests for test interactions" → "tests for interactions")

Fix typos in documentation

Adds `round_ties_even` using `simd_round_ties_even` intrinsic, matching the scalar `f32::round_ties_even` / `f64::round_ties_even` API. Closesrust-lang/portable-simd#390

Add exhuastive tests for `Mask::first_set` for all masks of size 8.

Apply two optimizations to `Mask::first_set`: 1) Move the call to `simd_cast` into the `const` block when initializing `index`. This removes runtime shuffles necessary to translate a `Simd<usize, N>` to a `Simd<T, N>`. 2) Replace the call to `mask.select` with `simd_or(!self, index)`. This is cheaper than doing a comparison and on some architectures the `or` can be combined with the `not` into a single instruction. See https://godbolt.org/z/YebG6aoMY for an example of the difference in generated assembly.

update `proptest` from `0.10` to `1.0`

Optimize `mask::first_set`

Add round_ties_even to StdFloat trait

bump toolchain to `nightly-2026-03-18`

* Add support for Hexagon HVX Add vendor module and tests for Qualcomm Hexagon HVX (Hexagon Vector eXtension) SIMD support. HVX provides wide vector operations in either 64-byte (512-bit) or 128-byte (1024-bit) mode. Note: u8x128/i8x128 types are not included because portable-simd currently limits lane count to 64 (bitmask operations use u64). In 128-byte HVX mode, u8x64 maps to a half-vector (512-bit). * fixup! Add support for Hexagon HVX fixup! Add support for Hexagon HVX Address reviewer feedback: - Remove hexagon_hvx test file (existing tests suffice with -C flags) - Move HvxVector imports into their respective cfg modules - Change u8x128/i8x128 comment to FIXME for discoverability

* remove time assertion on SystemTime * skip test only if when a time change occurs

* Add `f16` vector support * run `cargo update` * disable `f16` tests on wasm32 with simd128 llvm hangs in that case, see llvm/llvm-project#189251 * Add reference to LLVM issue causing f16 wasm ICE --------- Co-authored-by: Caleb Zulawski <caleb.zulawski@gmail.com>

…m-portable-simd-2026-04-11

…ark-Simulacrum Initial functions to start on transmute v2 For context, see rust-lang/rfcs#3844 and rust-lang/libs-team#772 *Experimental* still, tracked under rust-lang#155079 This is just library functions. A future PR will do compiler changes for things like lints.

…-Simulacrum fix spurious test failure in `metadata_access_times` Fixesrust-lang#148408 The metadata_access_times test checks if the creation of a file occurs before another file, this check happens only on Linux. While on Win and Macos we check only that the created metadata is available. Given that the SystemTime is non monotonic as Instant this test could result in failures when the system clock changes.

@WaffleLapkin

…ng, r=WaffleLapkin,Kivooeo replace <name> @ ty::AliasTy matches with just using args: <name>_args ref rust-lang#154941 replace `<name> @ ty::AliasTy` matches with just using `args: <name>_args` I updated all occurrences where <name> @ ty::AliasTy became unnecessary after the change. In cases where both forms are still used, no changes were made. r? @WaffleLapkin

…lver-region-resolution, r=Kivooeo Fix min-specialization ICE from ignored region resolution failure Fixesrust-lang#151327 `min_specialization::get_impl_args` resolved regions and then immediately called `fully_resolve`, but it ignored failures from `resolve_regions_and_report_errors`. Propagate the region-resolution error instead of ignoring it. That matches the pattern used in: https://github.com/rust-lang/rust/blob/40a3ed1e1407ebbe892ce1a74128482ea1dadf7a/compiler/rustc_hir_analysis/src/check/compare_impl_item.rs#L706 https://github.com/rust-lang/rust/blob/40a3ed1e1407ebbe892ce1a74128482ea1dadf7a/compiler/rustc_hir_analysis/src/coherence/builtin.rs#L421

Reduce size of `ImportData` Perhaps this will undo the regression caused by rust-lang#152901

jhpratt · 2026-04-12T01:12:35Z

@bors r+ rollup=never p=5

rust-bors · 2026-04-12T01:12:38Z

📌 Commit 040b6db has been approved by jhpratt

It is now in the queue for this repository.

rust-bors · 2026-04-12T04:25:19Z

☀️ Test successful - CI
Approved by: jhpratt
Duration: 3h 8m 37s
Pushing 6ad4d1b to main...

rust-timer · 2026-04-12T04:27:22Z

📌 Perf builds for each rolled up PR:

PR#	Message	Perf Build Sha
#153871	fix spurious test failure in `metadata_access_times`	`b865867b9d10ef3961fed6a1a2cbf2b41e13b6bc` (link)
#155084	Initial functions to start on transmute v2	`8af33cea63a2b8fb242c9495220da2983671e6b1` (link)
#155126	add `cfg(target_object_format = "...")`	`9d68571802b8117bcaf284cb392fbd2b0092684f` (link)
#155150	replace @ ty::AliasTy matches with just using args: …	`d7a66f8adc9586e0a59998b8b6579a037b03aa9c` (link)
#155159	Fix min-specialization ICE from ignored region resolution f…	`e800db98ad708d457cdbbe11b56075bd8b6b7e0e` (link)
#155165	Portable SIMD subtree update	`354fef25a54571b651c138a21a78ca0f51e18ae1` (link)
#155167	Reduce size of `ImportData`	`74a6338c747d8281b2cd12451b760e9942b00a8a` (link)

previous master: bf4fbfb7a1

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 · 2026-04-12T04:28:13Z

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 bf4fbfb (parent) -> 6ad4d1b (this PR)

Test differences

Show 285 test diffs

Stage 1

[mir-opt] tests/mir-opt/pre-codegen/transmutes.rs: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#aix: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#avr: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#bpfeb: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#bpfel: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#darwin: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#hermit: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#ios: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#linux_gnu: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#linux_musl: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#linux_ohos: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#linux_powerpc: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#msp430: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#sgx: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#thumb: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#uefi: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#wasm32: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#wasm64: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#win_gnu: [missing] -> pass (J0)
[ui] tests/ui/cfg/cfg_target_object_format.rs#win_msvc: [missing] -> pass (J0)
[ui] tests/ui/cfg/disallowed-cli-cfgs.rs#target_object_format_: [missing] -> pass (J0)
[ui] tests/ui/feature-gates/feature-gate-cfg_target_object_format.rs: [missing] -> pass (J0)
[ui] tests/ui/specialization/min_specialization/next-solver-region-resolution.rs: [missing] -> pass (J0)

Stage 2

[ui] tests/ui/cfg/cfg_target_object_format.rs#aix: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#avr: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#bpfeb: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#bpfel: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#darwin: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#hermit: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#ios: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#linux_gnu: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#linux_musl: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#linux_ohos: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#linux_powerpc: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#msp430: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#sgx: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#thumb: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#uefi: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#wasm32: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#wasm64: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#win_gnu: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/cfg_target_object_format.rs#win_msvc: [missing] -> ignore (gcc backend is marked as ignore) (J1)
[ui] tests/ui/cfg/disallowed-cli-cfgs.rs#target_object_format_: [missing] -> pass (J2)
[ui] tests/ui/feature-gates/feature-gate-cfg_target_object_format.rs: [missing] -> pass (J2)
[ui] tests/ui/specialization/min_specialization/next-solver-region-resolution.rs: [missing] -> pass (J2)
[ui] tests/ui/cfg/cfg_target_object_format.rs#aix: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#avr: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#bpfeb: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#bpfel: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#darwin: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#hermit: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#ios: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#linux_gnu: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#linux_musl: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#linux_ohos: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#linux_powerpc: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#msp430: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#sgx: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#thumb: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#uefi: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#wasm32: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#wasm64: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#win_gnu: [missing] -> pass (J3)
[ui] tests/ui/cfg/cfg_target_object_format.rs#win_msvc: [missing] -> pass (J3)
[mir-opt] tests/mir-opt/pre-codegen/transmutes.rs: [missing] -> pass (J4)

Additionally, 220 doctest diffs were found. These are ignored, as they are noisy.

Job group index

Test dashboard

Run

cargo run --manifest-path src/ci/citool/Cargo.toml -- \
test-dashboard 6ad4d1b0e7fdafb8b71ada0844571c955d7afd70 --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

dist-aarch64-llvm-mingw: 1h 29m -> 1h 58m (+32.7%)
x86_64-msvc-ext1: 2h 16m -> 1h 38m (-28.0%)
x86_64-msvc-2: 2h 35m -> 1h 54m (-26.2%)
aarch64-gnu-llvm-21-1: 54m 11s -> 1h 4m (+19.4%)
i686-gnu-2: 1h 26m -> 1h 43m (+18.8%)
arm-android: 1h 32m -> 1h 48m (+18.1%)
pr-check-1: 28m 25s -> 33m 6s (+16.5%)
optional-x86_64-gnu-parallel-frontend: 2h 22m -> 2h 43m (+14.7%)
x86_64-gnu-gcc: 59m 30s -> 1h 7m (+13.6%)
x86_64-gnu-debug: 1h 50m -> 2h 5m (+13.4%)

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 · 2026-04-12T05:06:47Z

Finished benchmarking commit (6ad4d1b): 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
Regressions ❌ (secondary)	0.1%	[0.0%, 0.2%]	10
Improvements ✅ (primary)	-0.4%	[-0.4%, -0.4%]	1
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	-0.4%	[-0.4%, -0.4%]	1

Max RSS (memory usage)

Results (primary 0.5%, secondary 0.9%)

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

	mean	range	count
Regressions ❌ (primary)	2.2%	[2.2%, 2.2%]	1
Regressions ❌ (secondary)	3.1%	[1.3%, 5.9%]	3
Improvements ✅ (primary)	-1.2%	[-1.2%, -1.2%]	1
Improvements ✅ (secondary)	-5.8%	[-5.8%, -5.8%]	1
All ❌✅ (primary)	0.5%	[-1.2%, 2.2%]	2

Cycles

Results (primary 3.2%, secondary 2.7%)

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

	mean	range	count
Regressions ❌ (primary)	3.2%	[2.0%, 3.9%]	3
Regressions ❌ (secondary)	2.7%	[2.5%, 2.9%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-	-	0
All ❌✅ (primary)	3.2%	[2.0%, 3.9%]	3

Binary size

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

Bootstrap: 490.796s -> 488.442s (-0.48%)
Artifact size: 394.14 MiB -> 394.16 MiB (0.01%)

panstromek · 2026-04-13T16:03:21Z

perf triage:

These regressions seem a bit mysterious to me, but I guess it could be the SIMD update, because it adds a bunch of stuff to std (IIUC) and I guess it can impact those doc benchmarks. include-blob is noise.

Either way, I don't see much actionable steps we could do with it and the regressions are tiny, so I don't think it's worth too much investigation. The queue is empty so I at least started a perf run on #155165.

@rustbot label: +perf-regression-triaged

Urgauand others added 30 commits January 29, 2026 18:27

Add basic triagebot configuration
0e4beba

Merge pull requestrust-lang#504from Urgau/triagebot-config
bad7930
Add basic triagebot configuration

Add Select and ToBytes to prelude
01f91e4

Merge pull requestrust-lang#506from okaneco/prelude
e797bc7
Add `Select` and `ToBytes` to prelude

docs(simd): fix load_select_or_default documentation
a8af194

show both kinds of masking-out elements in the example
08aa04d

more clear example
81dcf4c

Merge pull requestrust-lang#507from b01o/fix-doc-simd-load-select-o…
b6a0170
…r-default docs(simd): fix `load_select_or_default` documentation

Fix typos in documentation
af51712
- beginners-guide.md: fix missing letter ("within you" → "within your") - .github/PULL_REQUEST_TEMPLATE.md: remove duplicate word ("tests for test interactions" → "tests for interactions")

Merge pull requestrust-lang#508from him2him2/fix-typos
b8bef67
Fix typos in documentation

Add round_ties_even to StdFloat trait
e66819d
Adds `round_ties_even` using `simd_round_ties_even` intrinsic, matching the scalar `f32::round_ties_even` / `f64::round_ties_even` API. Closesrust-lang/portable-simd#390

update proptest from 0.10 to 1.0
dc5ab0d

Add tests for Mask::first_set
5c37faf
Add exhuastive tests for `Mask::first_set` for all masks of size 8.

Merge pull requestrust-lang#511from folkertdev/update-proptest
7d6df68
update `proptest` from `0.10` to `1.0`

Merge pull requestrust-lang#512from Kmeakin/km/simd-first-set
3bc9bcf
Optimize `mask::first_set`

Merge pull requestrust-lang#510from zRedShift/add-round-ties-even
99e9d40
Add round_ties_even to StdFloat trait

bump toolchain to nightly-2026-03-18
ed150fb

Merge pull requestrust-lang#514from folkertdev/toolchain-bump
0c17257
bump toolchain to `nightly-2026-03-18`

Initial methods to start on transmute v2
63d7f8e

add cfg(target_object_format = "...")
6bcd172

fix spurious test failure in metadata_access_times
9371fea
* remove time assertion on SystemTime * skip test only if when a time change occurs

add next-solver min-specialization region-resolution regression test
8998c11

propagate region resolution failures
40a3ed1

replace @ ty::AliasTy matches with just args
a133bb8

Merge commit '0557e3478104037c76c2e5be7ea21e56ebbaff6e' into sync-fro…
aa656a9
…m-portable-simd-2026-04-11

Reduce size of ImportData
c4e4156

jhpratt added 4 commits April 11, 2026 21:12

Rollup merge ofrust-lang#155167- mejrs:box_directive, r=Kivooeo
040b6db
Reduce size of `ImportData` Perhaps this will undo the regression caused by rust-lang#152901

rust-borsBot added the rollup A PR which is a rollup label Apr 12, 2026

rust-borsBot 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 Apr 12, 2026

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rust-borsBot 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 Apr 12, 2026

rust-borsBot merged commit 6ad4d1b into rust-lang:mainApr 12, 2026
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rustbot added this to the 1.97.0 milestone Apr 12, 2026

This was referenced Apr 12, 2026
asm! support for the Xtensa architecture #147302
Merged
stabilize feature(cfg_target_has_atomic_equal_alignment)#155006
Merged

rustbot added the perf-regression Performance regression. label Apr 12, 2026

jhpratt deleted the rollup-jQuvnVx branch April 12, 2026 05:07

panstromek mentioned this pull request Apr 13, 2026
Portable SIMD subtree update #155165
Merged

rustbot added the perf-regression-triaged The performance regression has been triaged. label Apr 13, 2026

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Rollup of 7 pull requests - #155175

Rollup of 7 pull requests#155175
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Overall result: ❌✅ regressions and improvements - please read:

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