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Update stdarch submodule (to before it switched to const generics)#83776

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jyn514:update-stdarch-docs
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Update stdarch submodule (to before it switched to const generics)#83776
bors merged 1 commit intorust-lang:masterfrom
jyn514:update-stdarch-docs

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@jyn514 jyn514 commented Apr 2, 2021 •
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#83278 (comment): This unblocks #82539.

Major changes:

  • More AVX-512 intrinsics.
  • More ARM & AArch64 NEON intrinsics.
  • Updated unstable WASM intrinsics to latest draft standards.
  • std_detect is now a separate crate instead of a submodule of std.

I double-checked and the first use of const generics looks like rust-lang/stdarch@8d50178, which isn't included in this PR.

r? @Amanieu

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rust-highfive commented Apr 2, 2021

⚠️ Warning ⚠️

  • These commits modify submodules.

@rust-highfive rust-highfive added the S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. label Apr 2, 2021
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@jyn514 jyn514 force-pushed the update-stdarch-docs branch from f9e8abd to dccfc81 Compare April 2, 2021 08:20
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jyn514 commented Apr 2, 2021

@Amanieu do you recognize the build failure? I don't see any changes to rustc-dep-of-std even looking at the full git history for stdarch :/ all the other changes are directly from #83278.

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Amanieu commented Apr 2, 2021

I think you'll need to cherry-pick rust-lang/stdarch#1089 which was added after the port to #[rustc_legacy_const_generics] started.

If you create a branch with that cherry pick then I can push it to rust-lang/stdarch so that you can use it for the submodule.

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jyn514 commented Apr 2, 2021

Thanks! https://github.com/jyn514/stdarch/tree/doc-include-fixed has the cherry-picked fix.

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Amanieu commented Apr 2, 2021

Pushed to https://github.com/rust-lang/stdarch/tree/rustc-2021-04-02

@jyn514 jyn514 force-pushed the update-stdarch-docs branch from dccfc81 to bbddfb4 Compare April 2, 2021 14:13
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jyn514 commented Apr 4, 2021 •
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It looks like this error is also present in the other PR: #83278 (comment). I think this may actually be a breaking change and libstd needs to re-export the macro in the crate root? I'll try that.

@jyn514 jyn514 force-pushed the update-stdarch-docs branch from bbddfb4 to 56c9326 Compare April 4, 2021 19:38
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jyn514 commented Apr 4, 2021

Ok, I think that should have worked.

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@jyn514 jyn514 force-pushed the update-stdarch-docs branch from 56c9326 to d0fd13f Compare April 4, 2021 19:51
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jyn514 commented Apr 4, 2021

Oh, I guess all the macros need the same treatment. @Amanieu is there an easy way to see all macros that are declared by stdarch? Is searching for @MACRO_NAME enough?

@jyn514 jyn514 force-pushed the update-stdarch-docs branch from d0fd13f to 70098c6 Compare April 4, 2021 21:39
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jyn514 commented Apr 4, 2021 •
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Apparently there are two different tracking issues for simd (??) #48556 #27731 https://rust-lang.zulipchat.com/#narrow/stream/122651-general/topic/Why.20are.20there.20two.20tracking.20issues.20for.20SIMD.3F

@jyn514 jyn514 force-pushed the update-stdarch-docs branch from 70098c6 to f297a40 Compare April 4, 2021 22:28
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Amanieu commented Apr 5, 2021

I'm not sure what's up with the two separate tracking issues, but this can be resolved separately.

@bors r+ rollup=never

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bors commented Apr 5, 2021

📌 Commit f297a4072cba08bab1f3fcf589247291fff79add has been approved by Amanieu

@bors 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-review Status: Awaiting review from the assignee but also interested parties. labels Apr 5, 2021
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bors commented Apr 5, 2021

⌛ Testing commit f297a4072cba08bab1f3fcf589247291fff79add with merge 59e207563090269860362bc18eea72adbe563a7e...

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Amanieu commented Apr 5, 2021

@bors retry

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jyn514 commented Apr 5, 2021

So fixing the error is easy enough, but I'm having trouble replicating it to make sure the fix is right. It looks like os::linux is only compiled when there's a non-x86 target? I tried cargo check --target aarch64-unknown-linux-gnu -p std_detect --features libc,std_detect_file_io but it didn't show any warnings.

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Amanieu commented Apr 5, 2021

The elided_lifetimes_in_paths lint is allow by default.

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Amanieu commented Apr 5, 2021

It's part of the rust_2018_idioms lint group, which really should be enabled by default at this point...

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Rollup merge of rust-lang#83878 - the8472:fix-concurrent-tidy-access,…
d856a26 
… r=Mark-Simulacrum

Fix racing file access in tidy

That should fix the failure in rust-lang#83776 (comment)

The file is only created for a brief moment during the bins checks in the source directories while other checks may also be visiting the same directory. By skipping it we avoid file not found errors.
@jyn514 jyn514 added S-blocked Status: Blocked on something else such as an RFC or other implementation work. and removed S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. labels Apr 6, 2021
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Amanieu commented Apr 12, 2021

I've updated the rustc-2021-04-02 branch on stdarch with rust-lang/stdarch#1108.

@jyn514
Update stdarch submodule (to before it switched to const generics)
1b0b7e9 
This also includes a cherry-pick of
rust-lang/stdarch@ec14619
and rust-lang/stdarch#1108 to fix a build
failure.

It also adds a re-export of various macros to the crate root of libstd -
previously they would show up automatically because std_detect was defined
in the same crate.
@jyn514 jyn514 force-pushed the update-stdarch-docs branch from f297a40 to 1b0b7e9 Compare April 12, 2021 13:39
@jyn514 jyn514 added S-waiting-on-review Status: Awaiting review from the assignee but also interested parties. and removed S-blocked Status: Blocked on something else such as an RFC or other implementation work. labels Apr 12, 2021
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Amanieu commented Apr 12, 2021

@bors r+

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bors commented Apr 12, 2021

📌 Commit 1b0b7e9 has been approved by Amanieu

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bors commented Apr 12, 2021

⌛ Testing commit 1b0b7e9 with merge d0695c9...

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bors commented Apr 12, 2021

☀️ Test successful - checks-actions
Approved by: Amanieu
Pushing d0695c9 to master...

@bors bors added the merged-by-bors This PR was explicitly merged by bors. label Apr 12, 2021
@bors bors merged commit d0695c9 into rust-lang:master Apr 12, 2021
@rustbot rustbot added this to the 1.53.0 milestone Apr 12, 2021
@jyn514 jyn514 deleted the update-stdarch-docs branch April 12, 2021 20:59
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bluss commented Apr 12, 2021

This should also fix some arch-specific detect bugs

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Mark-Simulacrum commented Apr 13, 2021

FWIW, this was a 1.4-1.5% memory usage regression on check, debug, and opt builds. I don't know that we necessarily want to do anything here - this may be entirely mitigated by the const generics rewrites. But thought I'd flag it.

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Amanieu commented Apr 13, 2021

Could this be because we are importing std_detect as a separate crate instead of having it as part of std?

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Auto merge of #9393 - ehuss:build-std-updating, r=alexcrichton
02103f9 
Fix build-std updating the index on every build.

rust-lang/rust#83776 has caused a problem where build-std will update the index on every build. That PR added `std_detect` from the `stdarch` submodule as a path dependency of `std`. However, since `stdarch` has a workspace of its own, an exclusion had to be added to `Cargo.toml` so that it does not treat `std_detect` as a workspace member (because nested workspaces are not supported).

The problem is that the std `Cargo.lock` file is built thinking that `std_detect` is *not* a workspace member. This means that its dev-dependencies are not included. However, when cargo resolves the std workspace, it doesn't know that `std_detect` should be excluded, so it considers it a workspace member (because it is a path dependency). This means that it expects the dev-dependencies to be in Cargo.lock. Because they are missing, it ends up poisoning the registry and triggering an update:

> poisoning registry `https://github.com/rust-lang/crates.io-index` because std_detect v0.1.5 (/Users/eric/.rustup/toolchains/nightly-x86_64-apple-darwin/lib/rustlib/src/rust/library/stdarch/crates/std_detect) looks like it changed auxv

The solution here is to skip dev-dependencies if they are not actively being resolved, even if the package is a workspace member.

This has happened before (#8962), so I have updated the test to check for it.

There are some alternative solutions I considered:

* Add support for nested workspaces. 😄
* Use a symlink to `std_detect` in the `rust-lang/rust` repository so that it appears to cargo as-if it is "outside" of the stdarch workspace, and thus can be treated like a normal workspace member (and remove the "exclude"). That seems a little hacky.

Fixes #9390
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