rustc_target: introduce Arch #147645

tamird · 2025-10-13T18:56:43Z

Improve type safety by using an enum rather than strings.

rustbot · 2025-10-13T18:56:47Z

These commits modify compiler targets.
(See the Target Tier Policy.)

Some changes occurred in compiler/rustc_attr_parsing

cc @jdonszelmann

Some changes occurred in cfg and check-cfg configuration

cc @Urgau

Some changes occurred in compiler/rustc_codegen_cranelift

cc @bjorn3

Some changes occurred in compiler/rustc_codegen_ssa

cc @WaffleLapkin

Some changes occurred in compiler/rustc_codegen_gcc

cc @antoyo, @GuillaumeGomez

rustbot · 2025-10-13T18:56:50Z

r? @nnethercote

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compiler/rustc_target/src/spec/mod.rs

nnethercote · 2025-10-13T22:03:22Z

This seems like a good change, but I think it's large enough that it should have an MCP, meeting the criteria of "Significant internal refactorings/changes" -- it's a simple change, but one that touches a lot of files.

tamird · 2025-10-14T01:34:22Z

This seems like a good change, but I think it's large enough that it should have an MCP, meeting the criteria of "Significant internal refactorings/changes" -- it's a simple change, but one that touches a lot of files.

Done: rust-lang/compiler-team#926.

Urgau · 2025-10-14T16:39:23Z

I'm curious if this has any performance impact, let's see.

@bors try @rust-timer queue

rustc_target: introduce Architecture

rust-bors · 2025-10-14T18:51:39Z

☀️ Try build successful (CI)
Build commit: 3a048fa (3a048fab4921cf40ac8c01ca813c3fde6e3a2caa, parent: e100792918c8bd9e0cb830f96fc9b171e8892fa1)

rust-timer · 2025-10-14T21:32:40Z

Finished benchmarking commit (3a048fa): comparison URL.

Overall result: ❌✅ regressions and improvements - no action needed

Benchmarking this pull request means it may be perf-sensitive – we'll automatically label it not fit for rolling up. You can override this, but we strongly advise not to, due to possible changes in compiler perf.

@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
Regressions ❌ (secondary)	0.8%	[0.8%, 0.8%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.2%	[-0.2%, -0.2%]	1
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary -2.1%, secondary 1.1%)

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)	1.8%	[1.0%, 3.6%]	7
Improvements ✅ (primary)	-2.1%	[-2.7%, -1.6%]	2
Improvements ✅ (secondary)	-1.3%	[-1.4%, -1.3%]	2
All ❌✅ (primary)	-2.1%	[-2.7%, -1.6%]	2

Cycles

Results (primary 2.1%, secondary 0.1%)

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

	mean	range	count
Regressions ❌ (primary)	2.1%	[2.1%, 2.1%]	1
Regressions ❌ (secondary)	3.6%	[3.6%, 3.6%]	1
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-3.4%	[-3.4%, -3.4%]	1
All ❌✅ (primary)	2.1%	[2.1%, 2.1%]	1

Binary size

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

Bootstrap: 473.51s -> 474.979s (0.31%)
Artifact size: 388.11 MiB -> 388.13 MiB (0.01%)

bors · 2025-10-15T01:35:17Z

☔ The latest upstream changes (presumably #147692) made this pull request unmergeable. Please resolve the merge conflicts.

nnethercote · 2025-10-24T09:04:33Z

Looks like two things are needed:

Rename Architecture as Arch (there were 8 people agreeing with this suggestion in the Zulip thread, judging by the emoji responses)
Add the Unknown variant.

@rustbot author

rustbot · 2025-11-05T02:28:59Z

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.

nnethercote · 2025-11-05T02:49:57Z

Looks good! Thanks for you patience with this one. I think it's a good improvement.

@bors r+

bors · 2025-11-05T02:49:59Z

📌 Commit 26b0560 has been approved by nnethercote

It is now in the queue for this repository.

bors · 2025-11-05T04:15:13Z

⌛ Testing commit 26b0560 with merge c0ff72f...

bors · 2025-11-05T07:24:32Z

☀️ Test successful - checks-actions
Approved by: nnethercote
Pushing c0ff72f to master...

github-actions · 2025-11-05T07:27:41Z

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 6e41e61 (parent) -> c0ff72f (this PR)

Test differences

Show 4 test diffs

Stage 0

tests::custom_arch_propagates_from_json: [missing] -> pass (J1)

Stage 1

tests::custom_arch_propagates_from_json: [missing] -> pass (J0)

Additionally, 2 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 c0ff72ffc4e88a2bbb69add95a4946d213996895 --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

pr-check-1: 1588.1s -> 1964.4s (+23.7%)
i686-gnu-1: 7223.9s -> 8442.1s (+16.9%)
aarch64-gnu-llvm-20-2: 2211.7s -> 2551.1s (+15.3%)
x86_64-gnu-llvm-20: 2485.2s -> 2792.9s (+12.4%)
dist-aarch64-apple: 6938.1s -> 6090.1s (-12.2%)
x86_64-gnu-gcc: 3256.4s -> 3622.2s (+11.2%)
i686-gnu-2: 5596.1s -> 6196.2s (+10.7%)
x86_64-gnu-llvm-20-2: 5352.8s -> 5916.4s (+10.5%)
x86_64-gnu-tools: 3328.3s -> 3667.2s (+10.2%)
dist-powerpc-linux: 4739.4s -> 5187.4s (+9.5%)

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 · 2025-11-05T09:18:21Z

Finished benchmarking commit (c0ff72f): comparison URL.

Overall result: ❌✅ regressions and 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)	0.1%	[0.1%, 0.1%]	2
Improvements ✅ (primary)	-	-	0
Improvements ✅ (secondary)	-0.1%	[-0.1%, -0.0%]	2
All ❌✅ (primary)	-	-	0

Max RSS (memory usage)

Results (primary 1.0%, secondary -1.6%)

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)	3.0%	[0.8%, 6.1%]	6
Improvements ✅ (primary)	-0.9%	[-0.9%, -0.9%]	1
Improvements ✅ (secondary)	-3.9%	[-5.6%, -1.8%]	12
All ❌✅ (primary)	1.0%	[-0.9%, 2.8%]	2

Cycles

Results (primary -3.8%, 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)	-	-	0
Regressions ❌ (secondary)	3.4%	[1.6%, 5.1%]	6
Improvements ✅ (primary)	-3.8%	[-3.8%, -3.8%]	1
Improvements ✅ (secondary)	-5.2%	[-9.1%, -1.5%]	6
All ❌✅ (primary)	-3.8%	[-3.8%, -3.8%]	1

Binary size

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

Bootstrap: 475.404s -> 474.063s (-0.28%)
Artifact size: 390.71 MiB -> 390.97 MiB (0.06%)

Relevant upstream PR: - rust-lang/rust#147645 (rustc_target: introduce Arch) Resolves: model-checking#4450

Relevant upstream PR: - rust-lang/rust#147645 (rustc_target: introduce Arch) Resolves: #4450 By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.

rustbot assigned nnethercote Oct 13, 2025

Urgau reviewed Oct 13, 2025

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compiler/rustc_target/src/spec/mod.rs Outdated Show resolved Hide resolved

tamird force-pushed the arch-enum branch 2 times, most recently from 289dc7b to 23b2e59 Compare October 13, 2025 20:42

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tamird force-pushed the arch-enum branch from 2d03fd5 to 2158f47 Compare October 13, 2025 21:58

tamird mentioned this pull request Oct 14, 2025

Replace rustc_target::specTarget::arch string with enum rust-lang/compiler-team#926

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rust-bors bot added a commit that referenced this pull request Oct 14, 2025

Auto merge of #147645 - tamird:arch-enum, r=<try>

3a048fa

rustc_target: introduce Architecture

rustbot added the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Oct 14, 2025

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rustbot removed the S-waiting-on-perf Status: Waiting on a perf run to be completed. label Oct 14, 2025

tamird force-pushed the arch-enum branch from 2158f47 to a175998 Compare October 23, 2025 17:44

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rustbot removed the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Oct 24, 2025

rustc_target: allow unenumerated architectures

26b0560

tamird force-pushed the arch-enum branch from 217e443 to 26b0560 Compare November 5, 2025 02:28

bors 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-author Status: This is awaiting some action (such as code changes or more information) from the author. labels Nov 5, 2025

bors added the merged-by-bors This PR was explicitly merged by bors. label Nov 5, 2025

bors merged commit c0ff72f into rust-lang:master Nov 5, 2025
12 checks passed

rustbot added this to the 1.93.0 milestone Nov 5, 2025

tamird deleted the arch-enum branch November 5, 2025 15:02

tautschnig added a commit to tautschnig/kani that referenced this pull request Nov 6, 2025

Upgrade Rust toolchain to 2025-11-06

05da9c2

Relevant upstream PR: - rust-lang/rust#147645 (rustc_target: introduce Arch) Resolves: model-checking#4450

tautschnig mentioned this pull request Nov 6, 2025

Upgrade Rust toolchain to 2025-11-06 model-checking/kani#4451

Merged

nnethercote mentioned this pull request Nov 6, 2025

Tracking issue for MCP 926: Replace rustc_target::specTarget::arch string with enum #148352

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rustc_target: introduce Arch #147645

rustc_target: introduce Arch #147645

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Overall result: ❌✅ regressions and improvements - no action needed

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Test differences

Stage 0

Stage 1

Job duration changes

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Overall result: ❌✅ regressions and improvements - no action needed

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