PGO for LLVM builds on x86_64-unknown-linux-gnu in CI #88069

Mark-Simulacrum · 2021-08-16T02:29:07Z

This shows up to 6% less instruction counts with larger - up to 18% - wins on cycles
on multiple benchmarks, and up to 19% wins on the -j1 wall times for rustc self-compilation.

We can afford to spend the extra cycles building LLVM essentially once more for
the x86_64-unknown-linux-gnu CI build today. The builder finishes in around 50
minutes on average, and this adds just 10 more minutes. Given the sizeable
improvements in compiler performance, this is definitely worth it.

Mark-Simulacrum · 2021-08-16T02:29:40Z

@bors try @rust-timer queue

Should produce ~equivalent results to #87940 (comment).

rust-timer · 2021-08-16T02:29:41Z

Awaiting bors try build completion.

@rustbot label: +S-waiting-on-perf

bors · 2021-08-16T02:29:48Z

⌛ Trying commit dd9a970 with merge d031afb4badc709d74475230f7013bfe01d08a80...

src/ci/docker/host-x86_64/dist-x86_64-linux/Dockerfile

bors · 2021-08-16T04:33:44Z

☀️ Try build successful - checks-actions
Build commit: d031afb4badc709d74475230f7013bfe01d08a80 (d031afb4badc709d74475230f7013bfe01d08a80)

rust-timer · 2021-08-16T04:33:45Z

Queued d031afb4badc709d74475230f7013bfe01d08a80 with parent 2bd17c1, future comparison URL.

rust-timer · 2021-08-16T06:28:09Z

Finished benchmarking try commit (d031afb4badc709d74475230f7013bfe01d08a80): comparison url.

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

Very large improvement in instruction counts (up to -6.5% on incr-patched: b9b3e592dd cherry picked builds of style-servo)
Small regression in instruction counts (up to 0.5% on full builds of coercions)

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

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR led to changes in compiler 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 fix the regressions and do another perf run. If the next run shows neutral or positive results, the label will be automatically removed.

@bors rollup=never
@rustbot label: +S-waiting-on-review -S-waiting-on-perf +perf-regression

Mark-Simulacrum · 2021-08-16T23:02:43Z

Adding perf-regression-triaged; per the PR description, this is a clear win that far exceeds the small losses.

michaelwoerister · 2021-08-19T15:09:53Z

Also note that as per my measurements in https://blog.rust-lang.org/inside-rust/2020/11/11/exploring-pgo-for-the-rust-compiler.html the actual wall-time wins are a lot bigger than one would expect from just looking at the instruction counts.

hkratz · 2021-08-19T15:28:13Z

The CPU cycles comparison is probably a more accurate metric for measuring the real improvements.

pietroalbini

The new LLVM profile data also needs to be added to bootstrap::dist::ReproducibleArtifacts.

src/ci/docker/host-x86_64/dist-x86_64-linux/build-clang.sh

src/ci/pgo.sh

Mark-Simulacrum · 2021-08-22T14:38:08Z

Pushed updates per comments.

pietroalbini · 2021-08-22T14:54:02Z

@bors r+

bors · 2021-08-22T14:54:03Z

📌 Commit 3060f0b5422cbd8e19632926140f7c3957850403 has been approved by pietroalbini

bors · 2021-08-22T16:07:21Z

⌛ Testing commit 3060f0b5422cbd8e19632926140f7c3957850403 with merge 91a6f4c173cd843195b26397c79c51d6a491f77e...

klensy · 2021-08-22T16:20:25Z

Btw, rustc's llvm version was recently updated to 13, is PGO was tested on that version?

This skips bumping Windows sccache because we run into compilation failures when doing so (-m32 not supported by clang-cl?). Not clear on cause, but seems easiest to just hold back. This should avoid PGO-related failures encountered on Linux, and more broadly seems like a good idea on other platforms as well (though it is likely not necessary right this moment).

This will ensure the optimized LLVM is used for local builds after rebasing immediately, rather than needing to wait for a future LLVM bump.

Mark-Simulacrum · 2021-08-25T20:27:38Z

@bors r=pietroalbini

Hold back on bumping Windows sccache for now due to the above failure.

bors · 2021-08-25T20:27:39Z

📌 Commit 1ea8d93 has been approved by pietroalbini

rust-timer · 2021-08-25T21:44:27Z

Finished benchmarking try commit (bd9eb44fa0ae5f4a2044f1c2fc30faf3dd64d56d): comparison url.

Summary: This change led to very large relevant improvements 🎉 in compiler performance.

Very large improvement in instruction counts (up to -6.4% on incr-patched: b9b3e592dd cherry picked builds of style-servo)

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

Benchmarking this pull request likely means that it is perf-sensitive, so we're automatically marking it as not fit for rolling up. While you can manually mark this PR as fit for rollup, we strongly recommend not doing so since this PR led to changes in compiler perf.

@bors rollup=never
@rustbot label: +S-waiting-on-review -S-waiting-on-perf -perf-regression

bors · 2021-08-25T22:57:09Z

⌛ Testing commit 1ea8d93 with merge 33a02c41e3257fa0bce7927e5dc5a8d33d6527b2...

rust-log-analyzer · 2021-08-25T23:54:34Z

The job dist-armhf-linux failed! Check out the build log: (web) (plain)

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

bors · 2021-08-25T23:58:16Z

💔 Test failed - checks-actions

Mark-Simulacrum · 2021-08-26T00:51:22Z

@bors retry

failed to get 200 response from https://crates.io/api/v1/crates/arrayvec/0.7.1/download, got 504

bors · 2021-08-26T01:14:19Z

⌛ Testing commit 1ea8d93 with merge c4be230...

bors · 2021-08-26T05:23:29Z

☀️ Test successful - checks-actions
Approved by: pietroalbini
Pushing c4be230 to master...

Pkgsrc changes: * Remove one now-longer-applicable patch, adjust a few others * Bump bootstrap requirements to 1.55.0. Upstream changes: Version 1.56.0 (2021-10-21) ======================== Language -------- - [The 2021 Edition is now stable.][rust#88100] See [the edition guide][rust-2021-edition-guide] for more details. - [The pattern in `binding @ pattern` can now also introduce new bindings.] [rust#85305] - [Union field access is permitted in `const fn`.][rust#85769] [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html Compiler -------- - [Upgrade to LLVM 13.][rust#87570] - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.][rust#88023] - [Allow specifying a deployment target version for all iOS targets][rust#87699] - [Warnings can be forced on with `--force-warn`.][rust#87472] This feature is primarily intended for usage by `cargo fix`, rather than end users. - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760] - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370] - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.] [rust#83342] The Windows console still requires valid Unicode, but this change allows splitting a UTF-8 character across multiple write calls. This allows, for instance, programs that just read and write data buffers (e.g. copying a file to stdout) without regard for Unicode or character boundaries. - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.] [rust#83093] For this use case, atomics scale much better under contention. - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835] - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744] - [`impl From<[(K, V); N]>` for all collections.][rust#84111] - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363] - [Treat invalid environment variable names as non-existent.][rust#86183] Previously, the environment functions would panic if given a variable name with an internal null character or equal sign (`=`). Now, these functions will just treat such names as non-existent variables, since the OS cannot represent the existence of a variable with such a name. Stabilised APIs --------------- - [`std::os::unix::fs::chroot`] - [`UnsafeCell::raw_get`] - [`BufWriter::into_parts`] - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`] These APIs were previously stable in `std`, but are now also available in `core`. - [`Vec::shrink_to`] - [`String::shrink_to`] - [`OsString::shrink_to`] - [`PathBuf::shrink_to`] - [`BinaryHeap::shrink_to`] - [`VecDeque::shrink_to`] - [`HashMap::shrink_to`] - [`HashSet::shrink_to`] These APIs are now usable in const contexts: - [`std::mem::transmute`] - [`[T]::first`][`slice::first`] - [`[T]::split_first`][`slice::split_first`] - [`[T]::last`][`slice::last`] - [`[T]::split_last`][`slice::split_last`] Cargo ----- - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.] [`rust-version`] This has no effect at present on dependency version selection. We encourage crates to specify their minimum supported Rust version, and we encourage CI systems that support Rust code to include a crate's specified minimum version in the text matrix for that crate by default. Compatibility notes ------------------- - [Update to new argument parsing rules on Windows.][rust#87580] This adjusts Rust's standard library to match the behavior of the standard libraries for C/C++. The rules have changed slightly over time, and this PR brings us to the latest set of rules (changed in 2008). - [Disallow the aapcs calling convention on aarch64][rust#88399] This was already not supported by LLVM; this change surfaces this lack of support with a better error message. - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385] - [Warn when an escaped newline skips multiple lines.][rust#87671] - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec` may return different values on glibc <= 2.24.][rust#81825] Rust now invokes the `clone3` system call directly, when available, to use new functionality available via that system call. Older versions of glibc cache the result of `getpid`, and only update that cache when calling glibc's clone/fork functions, so a direct system call bypasses that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason. Internal changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.][rust#88069] This improves the performance of most Rust builds. - [Unify representation of macros in internal data structures.][rust#88019] This change fixes a host of bugs with the handling of macros by the compiler, as well as rustdoc. [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html [`Iterator::intersperse`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse [`Iterator::intersperse_with`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: rust-lang/rust#84662 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field [rust#87671]: rust-lang/rust#87671 [rust#86183]: rust-lang/rust#86183 [rust#87385]: rust-lang/rust#87385 [rust#88100]: rust-lang/rust#88100 [rust#86860]: rust-lang/rust#86860 [rust#84039]: rust-lang/rust#84039 [rust#86492]: rust-lang/rust#86492 [rust#88363]: rust-lang/rust#88363 [rust#85305]: rust-lang/rust#85305 [rust#87832]: rust-lang/rust#87832 [rust#88069]: rust-lang/rust#88069 [rust#87472]: rust-lang/rust#87472 [rust#87699]: rust-lang/rust#87699 [rust#87570]: rust-lang/rust#87570 [rust#88023]: rust-lang/rust#88023 [rust#87760]: rust-lang/rust#87760 [rust#87370]: rust-lang/rust#87370 [rust#87580]: rust-lang/rust#87580 [rust#83342]: rust-lang/rust#83342 [rust#83093]: rust-lang/rust#83093 [rust#88177]: rust-lang/rust#88177 [rust#88548]: rust-lang/rust#88548 [rust#88551]: rust-lang/rust#88551 [rust#88299]: rust-lang/rust#88299 [rust#88220]: rust-lang/rust#88220 [rust#85835]: rust-lang/rust#85835 [rust#86879]: rust-lang/rust#86879 [rust#86744]: rust-lang/rust#86744 [rust#84662]: rust-lang/rust#84662 [rust#86593]: rust-lang/rust#86593 [rust#81050]: rust-lang/rust#81050 [rust#81363]: rust-lang/rust#81363 [rust#84111]: rust-lang/rust#84111 [rust#85769]: rust-lang/rust#85769 (comment) [rust#88490]: rust-lang/rust#88490 [rust#88269]: rust-lang/rust#88269 [rust#84176]: rust-lang/rust#84176 [rust#88399]: rust-lang/rust#88399 [rust#88227]: rust-lang/rust#88227 [rust#88200]: rust-lang/rust#88200 [rust#82776]: rust-lang/rust#82776 [rust#88077]: rust-lang/rust#88077 [rust#87728]: rust-lang/rust#87728 [rust#87050]: rust-lang/rust#87050 [rust#87619]: rust-lang/rust#87619 [rust#81825]: rust-lang/rust#81825 (comment) [rust#88019]: rust-lang/rust#88019 [rust#87666]: rust-lang/rust#87666

Pkgsrc changes: * Bump bootstrap kit version to 1.55.0. * Adjust patches as needed, some no longer apply (so removed) * Update checksum adjustments. * Avoid rust-llvm on SunOS * Optionally build docs * Remove reference to closed/old PR#54621 Upstream changes: Version 1.56.1 (2021-11-01) =========================== - New lints to detect the presence of bidirectional-override Unicode codepoints in the compiled source code ([CVE-2021-42574]) [CVE-2021-42574]: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42574 Version 1.56.0 (2021-10-21) ======================== Language -------- - [The 2021 Edition is now stable.][rust#88100] See [the edition guide][rust-2021-edition-guide] for more details. - [The pattern in `binding @ pattern` can now also introduce new bindings.] [rust#85305] - [Union field access is permitted in `const fn`.][rust#85769] [rust-2021-edition-guide]: https://doc.rust-lang.org/nightly/edition-guide/rust-2021/index.html Compiler -------- - [Upgrade to LLVM 13.][rust#87570] - [Support memory, address, and thread sanitizers on aarch64-unknown-freebsd.] [rust#88023] - [Allow specifying a deployment target version for all iOS targets][rust#87699] - [Warnings can be forced on with `--force-warn`.][rust#87472] This feature is primarily intended for usage by `cargo fix`, rather than end users. - [Promote `aarch64-apple-ios-sim` to Tier 2\*.][rust#87760] - [Add `powerpc-unknown-freebsd` at Tier 3\*.][rust#87370] - [Add `riscv32imc-esp-espidf` at Tier 3\*.][rust#87666] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Allow writing of incomplete UTF-8 sequences via stdout/stderr on Windows.] [rust#83342] The Windows console still requires valid Unicode, but this change allows splitting a UTF-8 character across multiple write calls. This allows, for instance, programs that just read and write data buffers (e.g. copying a file to stdout) without regard for Unicode or character boundaries. - [Prefer `AtomicU{64,128}` over Mutex for Instant backsliding protection.] [rust#83093] For this use case, atomics scale much better under contention. - [Implement `Extend<(A, B)>` for `(Extend<A>, Extend<B>)`][rust#85835] - [impl Default, Copy, Clone for std::io::Sink and std::io::Empty][rust#86744] - [`impl From<[(K, V); N]>` for all collections.][rust#84111] - [Remove `P: Unpin` bound on impl Future for Pin.][rust#81363] - [Treat invalid environment variable names as non-existent.][rust#86183] Previously, the environment functions would panic if given a variable name with an internal null character or equal sign (`=`). Now, these functions will just treat such names as non-existent variables, since the OS cannot represent the existence of a variable with such a name. Stabilised APIs --------------- - [`std::os::unix::fs::chroot`] - [`UnsafeCell::raw_get`] - [`BufWriter::into_parts`] - [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`] These APIs were previously stable in `std`, but are now also available in `core`. - [`Vec::shrink_to`] - [`String::shrink_to`] - [`OsString::shrink_to`] - [`PathBuf::shrink_to`] - [`BinaryHeap::shrink_to`] - [`VecDeque::shrink_to`] - [`HashMap::shrink_to`] - [`HashSet::shrink_to`] These APIs are now usable in const contexts: - [`std::mem::transmute`] - [`[T]::first`][`slice::first`] - [`[T]::split_first`][`slice::split_first`] - [`[T]::last`][`slice::last`] - [`[T]::split_last`][`slice::split_last`] Cargo ----- - [Cargo supports specifying a minimum supported Rust version in Cargo.toml.] [`rust-version`] This has no effect at present on dependency version selection. We encourage crates to specify their minimum supported Rust version, and we encourage CI systems that support Rust code to include a crate's specified minimum version in the text matrix for that crate by default. Compatibility notes ------------------- - [Update to new argument parsing rules on Windows.][rust#87580] This adjusts Rust's standard library to match the behavior of the standard libraries for C/C++. The rules have changed slightly over time, and this PR brings us to the latest set of rules (changed in 2008). - [Disallow the aapcs calling convention on aarch64][rust#88399] This was already not supported by LLVM; this change surfaces this lack of support with a better error message. - [Make `SEMICOLON_IN_EXPRESSIONS_FROM_MACROS` warn by default][rust#87385] - [Warn when an escaped newline skips multiple lines.][rust#87671] - [Calls to `libc::getpid` / `std::process::id` from `Command::pre_exec` may return different values on glibc <= 2.24.][rust#81825] Rust now invokes the `clone3` system call directly, when available, to use new functionality available via that system call. Older versions of glibc cache the result of `getpid`, and only update that cache when calling glibc's clone/fork functions, so a direct system call bypasses that cache update. glibc 2.25 and newer no longer cache `getpid` for exactly this reason. Internal changes ---------------- These changes provide no direct user facing benefits, but represent significant improvements to the internals and overall performance of rustc and related tools. - [LLVM is compiled with PGO in published x86_64-unknown-linux-gnu artifacts.] [rust#88069] This improves the performance of most Rust builds. - [Unify representation of macros in internal data structures.][rust#88019] This change fixes a host of bugs with the handling of macros by the compiler, as well as rustdoc. [`std::os::unix::fs::chroot`]: https://doc.rust-lang.org/stable/std/os/unix/fs/fn.chroot.html [`Iterator::intersperse`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse [`Iterator::intersperse_with`]: https://doc.rust-lang.org/stable/std/iter/trait.Iterator.html#method.intersperse [`UnsafeCell::raw_get`]: https://doc.rust-lang.org/stable/std/cell/struct.UnsafeCell.html#method.raw_get [`BufWriter::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.BufWriter.html#method.into_parts [`core::panic::{UnwindSafe, RefUnwindSafe, AssertUnwindSafe}`]: rust-lang/rust#84662 [`Vec::shrink_to`]: https://doc.rust-lang.org/stable/std/vec/struct.Vec.html#method.shrink_to [`String::shrink_to`]: https://doc.rust-lang.org/stable/std/string/struct.String.html#method.shrink_to [`OsString::shrink_to`]: https://doc.rust-lang.org/stable/std/ffi/struct.OsString.html#method.shrink_to [`PathBuf::shrink_to`]: https://doc.rust-lang.org/stable/std/path/struct.PathBuf.html#method.shrink_to [`BinaryHeap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.BinaryHeap.html#method.shrink_to [`VecDeque::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/struct.VecDeque.html#method.shrink_to [`HashMap::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_map/struct.HashMap.html#method.shrink_to [`HashSet::shrink_to`]: https://doc.rust-lang.org/stable/std/collections/hash_set/struct.HashSet.html#method.shrink_to [`std::mem::transmute`]: https://doc.rust-lang.org/stable/std/mem/fn.transmute.html [`slice::first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.first [`slice::split_first`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_first [`slice::last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.last [`slice::split_last`]: https://doc.rust-lang.org/stable/std/primitive.slice.html#method.split_last [`rust-version`]: https://doc.rust-lang.org/nightly/cargo/reference/manifest.html#the-rust-version-field [rust#87671]: rust-lang/rust#87671 [rust#86183]: rust-lang/rust#86183 [rust#87385]: rust-lang/rust#87385 [rust#88100]: rust-lang/rust#88100 [rust#86860]: rust-lang/rust#86860 [rust#84039]: rust-lang/rust#84039 [rust#86492]: rust-lang/rust#86492 [rust#88363]: rust-lang/rust#88363 [rust#85305]: rust-lang/rust#85305 [rust#87832]: rust-lang/rust#87832 [rust#88069]: rust-lang/rust#88069 [rust#87472]: rust-lang/rust#87472 [rust#87699]: rust-lang/rust#87699 [rust#87570]: rust-lang/rust#87570 [rust#88023]: rust-lang/rust#88023 [rust#87760]: rust-lang/rust#87760 [rust#87370]: rust-lang/rust#87370 [rust#87580]: rust-lang/rust#87580 [rust#83342]: rust-lang/rust#83342 [rust#83093]: rust-lang/rust#83093 [rust#88177]: rust-lang/rust#88177 [rust#88548]: rust-lang/rust#88548 [rust#88551]: rust-lang/rust#88551 [rust#88299]: rust-lang/rust#88299 [rust#88220]: rust-lang/rust#88220 [rust#85835]: rust-lang/rust#85835 [rust#86879]: rust-lang/rust#86879 [rust#86744]: rust-lang/rust#86744 [rust#84662]: rust-lang/rust#84662 [rust#86593]: rust-lang/rust#86593 [rust#81050]: rust-lang/rust#81050 [rust#81363]: rust-lang/rust#81363 [rust#84111]: rust-lang/rust#84111 [rust#85769]: rust-lang/rust#85769 (comment) [rust#88490]: rust-lang/rust#88490 [rust#88269]: rust-lang/rust#88269 [rust#84176]: rust-lang/rust#84176 [rust#88399]: rust-lang/rust#88399 [rust#88227]: rust-lang/rust#88227 [rust#88200]: rust-lang/rust#88200 [rust#82776]: rust-lang/rust#82776 [rust#88077]: rust-lang/rust#88077 [rust#87728]: rust-lang/rust#87728 [rust#87050]: rust-lang/rust#87050 [rust#87619]: rust-lang/rust#87619 [rust#81825]: rust-lang/rust#81825 (comment) [rust#88019]: rust-lang/rust#88019 [rust#87666]: rust-lang/rust#87666 Version 1.55.0 (2021-09-09) ============================ Language -------- - [You can now write open "from" range patterns (`X..`), which will start at `X` and will end at the maximum value of the integer.][83918] - [You can now explicitly import the prelude of different editions through `std::prelude` (e.g. `use std::prelude::rust_2021::*;`).][86294] Compiler -------- - [Added tier 3\* support for `powerpc64le-unknown-freebsd`.][83572] \* Refer to Rust's [platform support page][platform-support-doc] for more information on Rust's tiered platform support. Libraries --------- - [Updated std's float parsing to use the Eisel-Lemire algorithm.][86761] These improvements should in general provide faster string parsing of floats, no longer reject certain valid floating point values, and reduce the produced code size for non-stripped artifacts. - [`string::Drain` now implements `AsRef<str>` and `AsRef<[u8]>`.][86858] Stabilised APIs --------------- - [`Bound::cloned`] - [`Drain::as_str`] - [`IntoInnerError::into_error`] - [`IntoInnerError::into_parts`] - [`MaybeUninit::assume_init_mut`] - [`MaybeUninit::assume_init_ref`] - [`MaybeUninit::write`] - [`array::map`] - [`ops::ControlFlow`] - [`x86::_bittest`] - [`x86::_bittestandcomplement`] - [`x86::_bittestandreset`] - [`x86::_bittestandset`] - [`x86_64::_bittest64`] - [`x86_64::_bittestandcomplement64`] - [`x86_64::_bittestandreset64`] - [`x86_64::_bittestandset64`] The following previously stable functions are now `const`. - [`str::from_utf8_unchecked`] Cargo ----- - [Cargo will now deduplicate compiler diagnostics to the terminal when invoking rustc in parallel such as when using `cargo test`.][cargo/9675] - [The package definition in `cargo metadata` now includes the `"default_run"` field from the manifest.][cargo/9550] - [Added `cargo d` as an alias for `cargo doc`.][cargo/9680] - [Added `{lib}` as formatting option for `cargo tree` to print the `"lib_name"` of packages.][cargo/9663] Rustdoc ------- - [Added "Go to item on exact match" search option.][85876] - [The "Implementors" section on traits no longer shows redundant method definitions.][85970] - [Trait implementations are toggled open by default.][86260] This should make the implementations more searchable by tools like `CTRL+F` in your browser. - [Intra-doc links should now correctly resolve associated items (e.g. methods) through type aliases.][86334] - [Traits which are marked with `#[doc(hidden)]` will no longer appear in the "Trait Implementations" section.][86513] Compatibility Notes ------------------- - [std functions that return an `io::Error` will no longer use the `ErrorKind::Other` variant.][85746] This is to better reflect that these kinds of errors could be categorised [into newer more specific `ErrorKind` variants][79965], and that they do not represent a user error. - [Using environment variable names with `process::Command` on Windows now behaves as expected.][85270] Previously using envionment variables with `Command` would cause them to be ASCII-uppercased. - [Rustdoc will now warn on using rustdoc lints that aren't prefixed with `rustdoc::`][86849] [86849]: rust-lang/rust#86849 [86513]: rust-lang/rust#86513 [86334]: rust-lang/rust#86334 [86260]: rust-lang/rust#86260 [85970]: rust-lang/rust#85970 [85876]: rust-lang/rust#85876 [83572]: rust-lang/rust#83572 [86294]: rust-lang/rust#86294 [86858]: rust-lang/rust#86858 [86761]: rust-lang/rust#86761 [85769]: rust-lang/rust#85769 [85746]: rust-lang/rust#85746 [85305]: rust-lang/rust#85305 [85270]: rust-lang/rust#85270 [84111]: rust-lang/rust#84111 [83918]: rust-lang/rust#83918 [79965]: rust-lang/rust#79965 [87370]: rust-lang/rust#87370 [87298]: rust-lang/rust#87298 [cargo/9663]: rust-lang/cargo#9663 [cargo/9675]: rust-lang/cargo#9675 [cargo/9550]: rust-lang/cargo#9550 [cargo/9680]: rust-lang/cargo#9680 [cargo/9663]: rust-lang/cargo#9663 [`array::map`]: https://doc.rust-lang.org/stable/std/primitive.array.html#method.map [`Bound::cloned`]: https://doc.rust-lang.org/stable/std/ops/enum.Bound.html#method.cloned [`Drain::as_str`]: https://doc.rust-lang.org/stable/std/string/struct.Drain.html#method.as_str [`IntoInnerError::into_error`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_error [`IntoInnerError::into_parts`]: https://doc.rust-lang.org/stable/std/io/struct.IntoInnerError.html#method.into_parts [`MaybeUninit::assume_init_mut`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_mut [`MaybeUninit::assume_init_ref`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.assume_init_ref [`MaybeUninit::write`]: https://doc.rust-lang.org/stable/std/mem/union.MaybeUninit.html#method.write [`Seek::rewind`]: https://doc.rust-lang.org/stable/std/io/trait.Seek.html#method.rewind [`ops::ControlFlow`]: https://doc.rust-lang.org/stable/std/ops/enum.ControlFlow.html [`str::from_utf8_unchecked`]: https://doc.rust-lang.org/stable/std/str/fn.from_utf8_unchecked.html [`x86::_bittest`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittest.html [`x86::_bittestandcomplement`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandcomplement.html [`x86::_bittestandreset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandreset.html [`x86::_bittestandset`]: https://doc.rust-lang.org/stable/core/arch/x86/fn._bittestandset.html [`x86_64::_bittest64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittest64.html [`x86_64::_bittestandcomplement64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandcomplement64.html [`x86_64::_bittestandreset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandreset64.html [`x86_64::_bittestandset64`]: https://doc.rust-lang.org/stable/core/arch/x86_64/fn._bittestandset64.html

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Mark-Simulacrum force-pushed the llvm-pgo branch from dd9a970 to 3060f0b Compare August 22, 2021 14:38

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Mark-Simulacrum added 2 commits August 25, 2021 16:26

Bump download-ci-llvm stamp

1ea8d93

This will ensure the optimized LLVM is used for local builds after rebasing immediately, rather than needing to wait for a future LLVM bump.

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Enable AutoFDO. #87918

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PGO bustage in 1.56 #89194

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Support PGO in the compiler's build system #79562

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PGO for LLVM builds on x86_64-unknown-linux-gnu in CI #88069

PGO for LLVM builds on x86_64-unknown-linux-gnu in CI #88069

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PGO for LLVM builds on x86_64-unknown-linux-gnu in CI #88069

PGO for LLVM builds on x86_64-unknown-linux-gnu in CI #88069

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