Rust-GCC · CohenArthur · Sep 17, 2025 · Sep 17, 2025 · Sep 17, 2025
diff --git a/contrib/gcc-changelog/git_commit.py b/contrib/gcc-changelog/git_commit.py
@@ -151,6 +151,7 @@
     'libffi/',
     'libgo/',
     'libgrust/rustc-lib/core/',
+    'libgrust/rustc-lib/stdarch/',
     'libphobos/libdruntime/',
     'libphobos/src/',
     'libsanitizer/',

diff --git a/libgrust/rustc-lib/stdarch/.cirrus.yml b/libgrust/rustc-lib/stdarch/.cirrus.yml
@@ -0,0 +1,13 @@
+task:
+  name: x86_64-unknown-freebsd
+  freebsd_instance:
+    image: freebsd-12-1-release-amd64
+  setup_script:
+    - pkg install -y curl
+    - curl https://sh.rustup.rs -sSf --output rustup.sh
+    - sh rustup.sh --default-toolchain nightly -y
+    - . $HOME/.cargo/env
+    - rustup default nightly
+  test_script:
+    - . $HOME/.cargo/env
+    - cargo build --all
diff --git a/libgrust/rustc-lib/stdarch/.github/workflows/main.yml b/libgrust/rustc-lib/stdarch/.github/workflows/main.yml
@@ -0,0 +1,209 @@
+name: CI
+on:
+  push:
+    branches:
+    - auto
+    - try
+  pull_request:
+    branches:
+    - master
+
+jobs:
+  style:
+    name: Check Style
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Install Rust
+      run: rustup update nightly && rustup default nightly
+    - run: ci/style.sh
+
+  docs:
+    name: Build Documentation
+    needs: [style]
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Install Rust
+      run: rustup update nightly && rustup default nightly
+    - run: ci/dox.sh
+      env:
+        CI: 1
+    - name: Publish documentation
+      run: |
+        cd target/doc
+        git init
+        git add .
+        git -c user.name='ci' -c user.email='ci' commit -m init
+        git push -f -q https://git:${{ secrets.github_token }}@github.com/${{ github.repository }} HEAD:gh-pages
+      if: github.event_name == 'push' && github.event.ref == 'refs/heads/master'
+
+  verify:
+    name: Automatic intrinsic verification
+    needs: [style]
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Install Rust
+      run: rustup update nightly && rustup default nightly
+    - run: cargo test --manifest-path crates/stdarch-verify/Cargo.toml
+
+  env_override:
+    name: Env Override
+    needs: [style]
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@master
+    - name: Install Rust
+      run: rustup update nightly && rustup default nightly
+    - run: RUST_STD_DETECT_UNSTABLE=avx cargo test --features=std_detect_env_override --manifest-path crates/std_detect/Cargo.toml env_override_no_avx
+
+  test:
+    needs: [style]
+    name: Test
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        target:
+        # Dockers that are run through docker on linux
+        - i686-unknown-linux-gnu
+        - x86_64-unknown-linux-gnu
+        - x86_64-unknown-linux-gnu-emulated
+        - arm-unknown-linux-gnueabihf
+        - armv7-unknown-linux-gnueabihf
+        - aarch64-unknown-linux-gnu
+        - powerpc64le-unknown-linux-gnu
+        - mips-unknown-linux-gnu
+        - mips64-unknown-linux-gnuabi64
+        - mips64el-unknown-linux-gnuabi64
+        - s390x-unknown-linux-gnu
+        - wasm32-wasi
+        - i586-unknown-linux-gnu
+        - x86_64-linux-android
+        - arm-linux-androideabi
+        - mipsel-unknown-linux-musl
+        - aarch64-linux-android
+        - nvptx64-nvidia-cuda
+        - thumbv6m-none-eabi
+        - thumbv7m-none-eabi
+        - thumbv7em-none-eabi
+        - thumbv7em-none-eabihf
+
+        # macOS targets
+        - x86_64-apple-darwin
+        # FIXME: gh-actions build environment doesn't have linker support
+        # - i686-apple-darwin
+
+        # Windows targets
+        - x86_64-pc-windows-msvc
+        # FIXME: Disassembly not implemented for the # following targets:
+        # - x86_64-pc-windows-gnu:
+        # - i686-pc-windows-gnu:
+        # - i686-pc-windows-msvc:
+
+        include:
+        - target: i686-unknown-linux-gnu
+          os: ubuntu-latest
+        - target: x86_64-unknown-linux-gnu
+          os: ubuntu-latest
+        - target: x86_64-unknown-linux-gnu-emulated
+          os: ubuntu-latest
+          test_everything: true
+          rustflags: --cfg stdarch_intel_sde
+        - target: arm-unknown-linux-gnueabihf
+          os: ubuntu-latest
+        - target: armv7-unknown-linux-gnueabihf
+          os: ubuntu-latest
+          rustflags: -C target-feature=+neon
+        - target: mips-unknown-linux-gnu
+          os: ubuntu-latest
+          norun: true
+        - target: mips64-unknown-linux-gnuabi64
+          os: ubuntu-latest
+          norun: true
+        - target: mips64el-unknown-linux-gnuabi64
+          os: ubuntu-latest
+          norun: true
+        - target: powerpc64le-unknown-linux-gnu
+          os: ubuntu-latest
+          disable_assert_instr: true
+        - target: s390x-unknown-linux-gnu
+          os: ubuntu-latest
+        - target: wasm32-wasi
+          os: ubuntu-latest
+        - target: aarch64-unknown-linux-gnu
+          os: ubuntu-latest
+        - target: x86_64-apple-darwin
+          os: macos-latest
+        - target: x86_64-pc-windows-msvc
+          os: windows-latest
+        - target: i586-unknown-linux-gnu
+          os: ubuntu-latest
+        - target: x86_64-linux-android
+          os: ubuntu-latest
+          disable_assert_instr: 1
+        - target: arm-linux-androideabi
+          os: ubuntu-latest
+          disable_assert_instr: 1
+        - target: mipsel-unknown-linux-musl
+          os: ubuntu-latest
+          norun: 1
+        - target: aarch64-linux-android
+          os: ubuntu-latest
+          disable_assert_instr: 1
+        - target: nvptx64-nvidia-cuda
+          os: ubuntu-latest
+        - target: thumbv6m-none-eabi
+          os: ubuntu-latest
+        - target: thumbv7m-none-eabi
+          os: ubuntu-latest
+        - target: thumbv7em-none-eabi
+          os: ubuntu-latest
+        - target: thumbv7em-none-eabihf
+          os: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@master
+    - name: Install Rust (rustup)
+      run: |
+        rustup update nightly --no-self-update
+        rustup default nightly
+      if: matrix.os != 'macos-latest'
+    - name: Install Rust (macos)
+      run: |
+        curl https://sh.rustup.rs | sh -s -- -y --default-toolchain nightly
+        echo "##[add-path]$HOME/.cargo/bin"
+        rustup update nightly --no-self-update
+        rustup default nightly
+      if: matrix.os == 'macos-latest'
+    - run: |
+        rustup default nightly
+        rustup target add ${{ matrix.target }}
+      if: "!endsWith(matrix.target, 'emulated')"
+    - run: cargo generate-lockfile
+
+    # Configure some env vars based on matrix configuration
+    - run: echo "##[set-env name=NORUN]1"
+      if: matrix.norun != '' || startsWith(matrix.target, 'thumb') || matrix.target == 'nvptx64-nvidia-cuda'
+    - run: echo "##[set-env name=STDARCH_TEST_EVERYTHING]1"
+      if: matrix.test_everything != ''
+    - run: echo "##[set-env name=RUSTFLAGS]${{ matrix.rustflags }}"
+      if: matrix.rustflags != ''
+    - run: echo "##[set-env name=STDARCH_DISABLE_ASSERT_INSTR]1"
+      if: matrix.disable_assert_instr != ''
+    - run: echo "##[set-env name=NOSTD]1"
+      if: startsWith(matrix.target, 'thumb') || matrix.target == 'nvptx64-nvidia-cuda'
+
+    # Windows & OSX go straight to `run.sh` ...
+    - run: ./ci/run.sh
+      shell: bash
+      if: matrix.os != 'ubuntu-latest' || startsWith(matrix.target, 'thumb')
+      env:
+        TARGET: ${{ matrix.target }}
+
+    # ... while Linux goes to `run-docker.sh`
+    - run: ./ci/run-docker.sh ${{ matrix.target }}
+      shell: bash
+      if: "matrix.os == 'ubuntu-latest' && !startsWith(matrix.target, 'thumb')"
+      env:
+        TARGET: ${{ matrix.target }}
diff --git a/libgrust/rustc-lib/stdarch/.gitignore b/libgrust/rustc-lib/stdarch/.gitignore
@@ -0,0 +1,6 @@
+Cargo.lock
+.*.swp
+target
+tags
+crates/stdarch-gen/aarch64.rs
+crates/stdarch-gen/arm.rs
diff --git a/libgrust/rustc-lib/stdarch/CONTRIBUTING.md b/libgrust/rustc-lib/stdarch/CONTRIBUTING.md
@@ -0,0 +1,80 @@
+# Contributing to stdarch
+
+The `stdarch` crate is more than willing to accept contributions! First you'll
+probably want to check out the repository and make sure that tests pass for you:
+
+```
+$ git clone https://github.com/rust-lang/stdarch
+$ cd stdarch
+$ cargo +nightly test
+```
+
+To run codegen tests, run in release mode:
+
+```
+$ cargo +nightly test --release -p coresimd
+```
+
+Remember that this repository requires the nightly channel of Rust! If any of
+the above steps don't work, [please let us know][new]!
+
+Next up you can [find an issue][issues] to help out on, we've selected a few
+with the [`help wanted`][help] and [`impl-period`][impl] tags which could
+particularly use some help. You may be most interested in [#40][vendor],
+implementing all vendor intrinsics on x86. That issue's got some good pointers
+about where to get started!
+
+If you've got general questions feel free to [join us on gitter][gitter] and ask
+around! Feel free to ping either @BurntSushi or @alexcrichton with questions.
+
+[gitter]: https://gitter.im/rust-impl-period/WG-libs-simd
+
+# How to write examples for stdarch intrinsics
+
+There are a few features that must be enabled for the given intrinsic to work
+properly and the example must only be run by `cargo test --doc` when the feature
+is supported by the CPU. As a result, the default `fn main` that is generated by
+`rustdoc` will not work (in most cases). Consider using the following as a guide
+to ensure your example works as expected.
+
+```rust
+/// # // We need cfg_target_feature to ensure the example is only
+/// # // run by `cargo test --doc` when the CPU supports the feature
+/// # #![feature(cfg_target_feature)]
+/// # // We need target_feature for the intrinsic to work
+/// # #![feature(target_feature)]
+/// #
+/// # // rustdoc by default uses `extern crate stdarch`, but we need the
+/// # // `#[macro_use]`
+/// # #[macro_use] extern crate stdarch;
+/// #
+/// # // The real main function
+/// # fn main() {
+/// #     // Only run this if `<target feature>` is supported
+/// #     if cfg_feature_enabled!("<target feature>") {
+/// #         // Create a `worker` function that will only be run if the target feature
+/// #         // is supported and ensure that `target_feature` is enabled for your worker
+/// #         // function
+/// #         #[target_feature(enable = "<target feature>")]
+/// #         unsafe fn worker() {
+///
+/// // Write your example here. Feature specific intrinsics will work here! Go wild!
+///
+/// #         }
+/// #         unsafe { worker(); }
+/// #     }
+/// # }
+```
+
+If some of the above syntax does not look familiar, the [Documentation as tests] section
+of the [Rust Book] describes the `rustdoc` syntax quite well. As always, feel free
+to [join us on gitter][gitter] and ask us if you hit any snags, and thank you for helping
+to improve the documentation of `stdarch`!
+
+[new]: https://github.com/rust-lang/stdarch/issues/new
+[issues]: https://github.com/rust-lang/stdarch/issues
+[help]: https://github.com/rust-lang/stdarch/issues?q=is%3Aissue+is%3Aopen+label%3A%22help+wanted%22
+[impl]: https://github.com/rust-lang/stdarch/issues?q=is%3Aissue+is%3Aopen+label%3Aimpl-period
+[vendor]: https://github.com/rust-lang/stdarch/issues/40
+[Documentation as tests]: https://doc.rust-lang.org/book/first-edition/documentation.html#documentation-as-tests
+[Rust Book]: https://doc.rust-lang.org/book/first-edition
diff --git a/libgrust/rustc-lib/stdarch/Cargo.toml b/libgrust/rustc-lib/stdarch/Cargo.toml
@@ -0,0 +1,21 @@
+[workspace]
+members = [
+  "crates/stdarch-verify",
+  "crates/core_arch",
+  "crates/std_detect",
+  "crates/stdarch-gen",
+  "examples/"
+]
+exclude = [
+  "crates/wasm-assert-instr-tests"
+]
+
+[profile.release]
+debug = true
+opt-level = 3
+incremental = true
+
+[profile.bench]
+debug = 1
+opt-level = 3
+incremental = true