Replace Copy/Clone compiler magic on arrays with library impls by bstrie · Pull Request #86041 · rust-lang/rust

bstrie · 2021-06-05T21:24:17Z

With const generics the compiler no longer needs to fake these impls.

rust-highfive · 2021-06-05T21:24:20Z

r? @joshtriplett

(rust-highfive has picked a reviewer for you, use r? to override)

library/core/src/array/mod.rs

tmiasko · 2021-06-07T03:48:28Z

The code building the clone shim for array can be removed now as well, right?

bstrie · 2021-06-12T21:37:16Z

I've addressed the feedback and this is ready for review.

bors · 2021-08-18T13:34:24Z

☔ The latest upstream changes (presumably #87781) made this pull request unmergeable. Please resolve the merge conflicts.

wesleywiser · 2021-09-02T14:19:40Z

Hi @bstrie! Would you mind rebasing this PR and resolving the merge conflict so we can do a perf run? Assuming that does not reveal any issues, I think we're about ready to merge this.

jackh726

This LGTM to me on compiler and traits changes.

JohnCSimon · 2021-09-20T02:35:40Z

Ping from triage:
@bstrie can you please resolve the merge conflicts?

joshtriplett · 2021-10-04T03:29:15Z

This seems reasonable to me, once the merge conflicts are resolved and a perf run comes back without regressions.

jackh726 · 2021-11-09T04:04:25Z

Maybe we could write a simple specialized function for clone that would be easier for LLVM to optimize on release and would require less codegen on debug (reusing the code for Guard):

Imo, i think this would better be left as followup.

jackh726 · 2021-11-09T04:09:57Z

Okay, given previous review from @joshtriplett, previous discussion during a compiler meeting, and perf review by @Mark-Simulacrum, and my own review of compiler/traits changes, I'm going to go ahead and @bors r+

bors · 2021-11-09T04:09:58Z

📌 Commit 61b1394 has been approved by jackh726

bors · 2021-11-09T04:25:18Z

⌛ Testing commit 61b1394 with merge fc59b7e59222dafbb1811b9c34659bf35deff255...

rust-log-analyzer · 2021-11-09T05:26:58Z

The job x86_64-msvc-cargo failed! Check out the build log: (web) (plain)

Click to see the possible cause of the failure (guessed by this bot)

test workspaces::ws_warn_unused ... ok

failures:

---- lto::complicated stdout ----
running `D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\release\cargo.exe build -v --release`
thread 'lto::complicated' panicked at '
test failed running `D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\release\cargo.exe build -v --release`
error: process exited with code 101 (expected 0)

--- stderr
--- stderr
    Updating `dummy-registry` index
---
The targets should have unique names.
Consider changing their names to be unique or compiling them separately.
This may become a hard error in the future; see <https://github.com/rust-lang/cargo/issues/6313>.
   Compiling dep-shared v0.0.1
   Compiling dep-build2 v0.0.1
   Compiling dep-normal2 v0.0.1
   Compiling dep-proc-macro2 v0.0.1
     Running `rustc --crate-name dep_shared D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\home\.cargo\registry\src\-80b16767b11d2893\dep-shared-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C metadata=815663fa4ca118de -C extra-filename=-815663fa4ca118de --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps --cap-lints allow`
     Running `rustc --crate-name dep_build2 D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\home\.cargo\registry\src\-80b16767b11d2893\dep-build2-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no -C metadata=df572682f4638748 -C extra-filename=-df572682f4638748 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps --cap-lints allow`
     Running `rustc --crate-name dep_proc_macro2 D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\home\.cargo\registry\src\-80b16767b11d2893\dep-proc-macro2-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no -C metadata=f829152b9eb79c53 -C extra-filename=-f829152b9eb79c53 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps --cap-lints allow`
     Running `rustc --crate-name dep_normal2 D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\home\.cargo\registry\src\-80b16767b11d2893\dep-normal2-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi,artifacts --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C linker-plugin-lto -C metadata=8cf56e81cc7e8007 -C extra-filename=-8cf56e81cc7e8007 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps --cap-lints allow`
   Compiling dep-build v0.0.1
     Running `rustc --crate-name dep_build D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\home\.cargo\registry\src\-80b16767b11d2893\dep-build-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C embed-bitcode=no -C metadata=4b7343fd1f9e1e57 -C extra-filename=-4b7343fd1f9e1e57 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps --extern dep_build2=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\libdep_build2-df572682f4638748.rmeta --extern dep_shared=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\libdep_shared-815663fa4ca118de.rmeta --cap-lints allow`
   Compiling dep-normal v0.0.1
     Running `rustc --crate-name dep_normal D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\home\.cargo\registry\src\-80b16767b11d2893\dep-normal-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -C opt-level=3 -C linker-plugin-lto -C metadata=06ea447f8e785b1a -C extra-filename=-06ea447f8e785b1a --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps --extern dep_normal2=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\libdep_normal2-8cf56e81cc7e8007.rmeta --extern dep_shared=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\libdep_shared-815663fa4ca118de.rmeta --cap-lints allow`
   Compiling dep-proc-macro v0.0.1
     Running `rustc --crate-name dep_proc_macro D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\home\.cargo\registry\src\-80b16767b11d2893\dep-proc-macro-0.0.1\src\lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type proc-macro --emit=dep-info,link -C prefer-dynamic -C opt-level=3 -C embed-bitcode=no -C metadata=92b443923583e648 -C extra-filename=-92b443923583e648 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps --extern dep_proc_macro2=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\libdep_proc_macro2-f829152b9eb79c53.rlib --extern dep_shared=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\libdep_shared-815663fa4ca118de.rlib --extern proc_macro --cap-lints allow`
   Compiling test v0.0.0 (D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo)
     Running `rustc --crate-name build_script_build build.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C opt-level=3 -C embed-bitcode=no -C metadata=1132ccd72abf6ae6 -C extra-filename=-1132ccd72abf6ae6 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\build\test-1132ccd72abf6ae6 -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps --extern dep_build=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\libdep_build-4b7343fd1f9e1e57.rlib`
     Running `D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\build\test-1132ccd72abf6ae6\build-script-build`
     Running `rustc --crate-name test src\lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type cdylib --crate-type staticlib --emit=dep-info,link -C opt-level=3 -C lto -C metadata=10d13534f609fec7 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps --extern dep_normal=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\libdep_normal-06ea447f8e785b1a.rlib --extern dep_proc_macro=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\dep_proc_macro-92b443923583e648.dll`
     Running `rustc --crate-name test src\main.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type bin --emit=dep-info,link -C opt-level=3 -C lto -C metadata=f9bd7972e02c2e3b --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps --extern dep_normal=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\libdep_normal-06ea447f8e785b1a.rlib --extern dep_proc_macro=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\dep_proc_macro-92b443923583e648.dll`
error: linking with `link.exe` failed: exit code: 1201
  |
  = note: "C:\\Program Files (x86)\\Microsoft Visual Studio\\2019\\Enterprise\\VC\\Tools\\MSVC\\14.29.30133\\bin\\HostX64\\x64\\link.exe" "/DEF:C:\\Users\\RUNNER~1\\AppData\\Local\\Temp\\rustcqSodh1\\lib.def" "/NOLOGO" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2-tools\\x86_64-pc-windows-msvc\\tmp\\cit\\t1287\\foo\\target\\release\\deps\\test.test.3b04ecf7-cgu.0.rcgu.o" "/LIBPATH:D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2-tools\\x86_64-pc-windows-msvc\\tmp\\cit\\t1287\\foo\\target\\release\\deps" "/LIBPATH:D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2\\lib\\rustlib\\x86_64-pc-windows-msvc\\lib" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2\\lib\\rustlib\\x86_64-pc-windows-msvc\\lib\\libcompiler_builtins-2bd9c3b9b2394772.rlib" "kernel32.lib" "ws2_32.lib" "bcrypt.lib" "advapi32.lib" "userenv.lib" "kernel32.lib" "msvcrt.lib" "/NXCOMPAT" "/LIBPATH:D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2\\lib\\rustlib\\x86_64-pc-windows-msvc\\lib" "/OUT:D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2-tools\\x86_64-pc-windows-msvc\\tmp\\cit\\t1287\\foo\\target\\release\\deps\\test.dll" "/OPT:REF,ICF" "/DLL" "/IMPLIB:D:\\a\\rust\\rust\\build\\x86_64-pc-windows-msvc\\stage2-tools\\x86_64-pc-windows-msvc\\tmp\\cit\\t1287\\foo\\target\\release\\deps\\test.dll.lib" "/DEBUG"
  = note: LINK : fatal error LNK1201: error writing to program database 'D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\test.pdb'; check for insufficient disk space, invalid path, or insufficient privilege

error: could not compile `test` due to previous error

Caused by:
Caused by:
  process didn't exit successfully: `rustc --crate-name test src\lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type cdylib --crate-type staticlib --emit=dep-info,link -C opt-level=3 -C lto -C metadata=10d13534f609fec7 --out-dir D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps -L dependency=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps --extern dep_normal=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\libdep_normal-06ea447f8e785b1a.rlib --extern dep_proc_macro=D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools\x86_64-pc-windows-msvc\tmp\cit\t1287\foo\target\release\deps\dep_proc_macro-92b443923583e648.dll` (exit code: 1)
error: build failed
', src\tools\cargo\tests\testsuite\lto.rs:217:10
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace

bors · 2021-11-09T05:33:10Z

💔 Test failed - checks-actions

jackh726 · 2021-11-09T11:39:30Z

@bors retry

bors · 2021-11-09T17:13:48Z

⌛ Testing commit 61b1394 with merge d608229...

bors · 2021-11-09T20:09:47Z

☀️ Test successful - checks-actions
Approved by: jackh726
Pushing d608229 to master...

rust-timer · 2021-11-09T21:41:40Z

Finished benchmarking commit (d608229): comparison url.

Summary: This change led to moderate relevant mixed results 🤷 in compiler performance.

Moderate improvement in instruction counts (up to -1.2% on incr-unchanged builds of deeply-nested)
Moderate regression in instruction counts (up to 1.0% on full builds of cranelift-codegen)

If you disagree with this performance assessment, please file an issue in rust-lang/rustc-perf.

Next Steps: If you can justify the regressions found in this perf run, please indicate this with @rustbot label: +perf-regression-triaged along with sufficient written justification. If you cannot justify the regressions please open an issue or create a new PR that fixes the regressions, add a comment linking to the newly created issue or PR, and then add the perf-regression-triaged label to this PR.

@rustbot label: +perf-regression

As of rust-lang/rust#86041, `Clone` impls for array types are now implemented in library code rather than using `clone` shims. As such, the `TyKind::Array` case in the code surrounding `CloneShim`s is now unreachable. This removes the code to simplify things. To prevent future regressions, this adds a test case that `clone`s an array and ensures that it does not emit a `don't know how to build clone shim` warning. Fixes #197.

As of rust-lang/rust#86041, `Clone` impls for array types are now implemented in library code rather than using `clone` shims. As such, the `TyArray` case in the code supporting custom translations for clone shims is now unreachable. This removes the code to simplify things. This also bumps the `mir-json` submodule to bring in a fix for GaloisInc/mir-json#197, which is in similar territory. Note that the already existing `test/conc_eval/array/clone.rs` test case ensures that `crucible-mir` can continue to support cloning arrays without issues. Fixes #1646.

rust-highfive assigned joshtriplett Jun 5, 2021

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bstrie force-pushed the unmagic-array-copy branch from 601e975 to 4f2d9b4 Compare June 12, 2021 21:01

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bors added the merged-by-bors This PR was explicitly merged by bors. label Nov 9, 2021

bors merged commit d608229 into rust-lang:master Nov 9, 2021

rustbot added this to the 1.58.0 milestone Nov 9, 2021

bors mentioned this pull request Nov 9, 2021

do not emit overlap errors for impls failing the orphan check #89550

Merged

scottmcm mentioned this pull request Nov 10, 2021

Specialize array cloning for Copy types #90755

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bstrie mentioned this pull request Nov 11, 2021

Update list of types with magic Copy impls rust-lang/reference#1104

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lcnr added the A-const-generics Area: const generics (parameters and arguments) label Dec 11, 2021

lcnr mentioned this pull request Dec 11, 2021

Tracking issue for const generics (RFC 2000) #44580

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bstrie mentioned this pull request Mar 21, 2022

Fix/upgrade Chalk in wake of librarifying Copy/Clone on arrays and reinstate test rust-lang/chalk#758

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This was referenced Nov 24, 2025

Remove clone shim logic for arrays GaloisInc/mir-json#197

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crucible-mir: Remove clone shim logic for arrays GaloisInc/crucible#1646

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