Auto merge of #141899 - Kobzol:stdarch-josh, r=<try>

Turn `stdarch` into a Josh subtree

In a similar vein as #141229, this PR makes the `stdarch` repository a Josh subtree (it was previously a submodule). The initial commit of `stdarch` upon this is based is `5a7342fc16b208b1b16624e886937ed8509a6506`, which is the previous commit SHA of the `stdarch` submodule. The sync was performed according to https://hackmd.io/7pOuxnkdQDaL1Y1FQr65xg.

This was decided in rust-lang/stdarch#1655.

Test pull PR on my fork: Kobzol/stdarch#1
Test push PR on my fork: Kobzol#59

I plan to use the same Rust (miri-inspired) tooling that we use for `rustc-dev-guide` to enable pulls/pushes on stdarch.

Note that this repository currently doesn't have any stdarch-specific tests, so before that, the subtree should only be modified through this repository only when dealing with changes that contain "cyclical dependencies" between stdarch and rustc. The long term vision is to integrate stdarch into rust-lang/rust completely.

CC `@Amanieu`

try-job: aarch64-apple
try-job: aarch64-gnu
try-job: `x86_64-msvc-*`
try-job: x86_64-gnu
try-job: x86_64-gnu-aux

Author: rust-bors[bot]

.gitmodules

@@ -18,10 +18,6 @@
 	path = src/doc/rust-by-example
 	url = https://github.com/rust-lang/rust-by-example.git
 	shallow = true
-[submodule "library/stdarch"]
-	path = library/stdarch
-	url = https://github.com/rust-lang/stdarch.git
-	shallow = true
 [submodule "src/doc/edition-guide"]
 	path = src/doc/edition-guide
 	url = https://github.com/rust-lang/edition-guide.git

library/stdarch

@@ -0,0 +1,16 @@
+task:
+  name: x86_64-unknown-freebsd
+  freebsd_instance:
+    image_family: freebsd-13-4
+  env:
+    # FIXME(freebsd): FreeBSD has a segfault when `RUST_BACKTRACE` is set
+    # https://github.com/rust-lang/rust/issues/132185
+    RUST_BACKTRACE: "0"
+  setup_script:
+    - 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

library/stdarch/.cirrus.yml

@@ -0,0 +1,4 @@
+# Use `git config blame.ignorerevsfile .git-blame-ignore-revs` to make `git blame` ignore the following commits.
+
+# format with style edition 2024
+fc87bd98d689590a0b6f5ee4110c5b9f962faa66

library/stdarch/.git-blame-ignore-revs

@@ -0,0 +1,288 @@
+name: CI
+on:
+  pull_request:
+  merge_group:
+
+jobs:
+  style:
+    name: Check Style
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install Rust
+      run: rustup update nightly --no-self-update && rustup default nightly
+    - run: ci/style.sh
+
+  docs:
+    name: Build Documentation
+    needs: [style]
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install Rust
+      run: rustup update nightly --no-self-update && rustup default nightly
+    - run: ci/dox.sh
+      env:
+        CI: 1
+
+  verify:
+    name: Automatic intrinsic verification
+    needs: [style]
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install Rust
+      run: rustup update nightly --no-self-update && rustup default nightly
+    - run: cargo test --manifest-path crates/stdarch-verify/Cargo.toml
+
+  test:
+    needs: [style]
+    name: Test
+    runs-on: ${{ matrix.target.os }}
+    strategy:
+      matrix:
+        profile:
+        - dev
+        - release
+        target:
+        # Dockers that are run through docker on linux
+        - tuple: i686-unknown-linux-gnu
+          os: ubuntu-latest
+        - tuple: x86_64-unknown-linux-gnu
+          os: ubuntu-latest
+        - tuple: arm-unknown-linux-gnueabihf
+          os: ubuntu-latest
+        - tuple: armv7-unknown-linux-gnueabihf
+          os: ubuntu-latest
+        - tuple: aarch64-unknown-linux-gnu
+          os: ubuntu-latest
+        - tuple: aarch64_be-unknown-linux-gnu
+          os: ubuntu-latest
+        - tuple: riscv32gc-unknown-linux-gnu
+          os: ubuntu-latest
+        - tuple: riscv64gc-unknown-linux-gnu
+          os: ubuntu-latest
+        - tuple: powerpc-unknown-linux-gnu
+          os: ubuntu-latest
+        - tuple: powerpc64-unknown-linux-gnu
+          os: ubuntu-latest
+        - tuple: powerpc64le-unknown-linux-gnu
+          os: ubuntu-latest
+        # MIPS targets disabled since they are dropped to tier 3.
+        # See https://github.com/rust-lang/compiler-team/issues/648
+        #- tuple: mips-unknown-linux-gnu
+        #  os: ubuntu-latest
+        #- tuple: mips64-unknown-linux-gnuabi64
+        #  os: ubuntu-latest
+        #- tuple: mips64el-unknown-linux-gnuabi64
+        #  os: ubuntu-latest
+        #- tuple: mipsel-unknown-linux-musl
+        #  os: ubuntu-latest
+        - tuple: s390x-unknown-linux-gnu
+          os: ubuntu-latest
+        - tuple: i586-unknown-linux-gnu
+          os: ubuntu-latest
+        - tuple: nvptx64-nvidia-cuda
+          os: ubuntu-latest
+        - tuple: thumbv6m-none-eabi
+          os: ubuntu-latest
+        - tuple: thumbv7m-none-eabi
+          os: ubuntu-latest
+        - tuple: thumbv7em-none-eabi
+          os: ubuntu-latest
+        - tuple: thumbv7em-none-eabihf
+          os: ubuntu-latest
+        - tuple: loongarch64-unknown-linux-gnu
+          os: ubuntu-latest
+        - tuple: wasm32-wasip1
+          os: ubuntu-latest
+
+        # macOS targets
+        - tuple: x86_64-apple-darwin
+          os: macos-15-large
+        - tuple: x86_64-apple-ios-macabi
+          os: macos-15-large
+        - tuple: aarch64-apple-darwin
+          os: macos-15
+        - tuple: aarch64-apple-ios-macabi
+          os: macos-15
+        # FIXME: gh-actions build environment doesn't have linker support
+        # - tuple: i686-apple-darwin
+        #   os: macos-13
+
+        # Windows targets
+        - tuple: x86_64-pc-windows-msvc
+          os: windows-2025
+        - tuple: i686-pc-windows-msvc
+          os: windows-2025
+        - tuple: aarch64-pc-windows-msvc
+          os: windows-11-arm
+        - tuple: x86_64-pc-windows-gnu
+          os: windows-2025
+        # - tuple: i686-pc-windows-gnu
+        #   os: windows-latest
+
+        # Add additional variables to the matrix variations generated above using `include`:
+        include:
+        # `TEST_EVERYTHING` setups - there should be at least 1 for each architecture
+        - target:
+            tuple: aarch64-unknown-linux-gnu
+            os: ubuntu-latest
+          test_everything: true
+        - target:
+            tuple: aarch64_be-unknown-linux-gnu
+            os: ubuntu-latest
+          test_everything: true
+          build_std: true
+        - target:
+            tuple: armv7-unknown-linux-gnueabihf
+            os: ubuntu-latest
+          test_everything: true
+        - target:
+            tuple: loongarch64-unknown-linux-gnu
+            os: ubuntu-latest
+          test_everything: true
+        - target:
+            tuple: powerpc-unknown-linux-gnu
+            os: ubuntu-latest
+          disable_assert_instr: true
+          test_everything: true
+        - target:
+            tuple: powerpc64-unknown-linux-gnu
+            os: ubuntu-latest
+          disable_assert_instr: true
+          test_everything: true
+        - target:
+            tuple: powerpc64le-unknown-linux-gnu
+            os: ubuntu-latest
+          test_everything: true
+        - target:
+            tuple: riscv32gc-unknown-linux-gnu
+            os: ubuntu-latest
+          test_everything: true
+          build_std: true
+        - target:
+            tuple: riscv64gc-unknown-linux-gnu
+            os: ubuntu-latest
+          test_everything: true
+        - target:
+            tuple: s390x-unknown-linux-gnu
+            os: ubuntu-latest
+          test_everything: true
+        - target:
+            tuple: x86_64-unknown-linux-gnu
+            os: ubuntu-latest
+          test_everything: true
+        # MIPS targets disabled since they are dropped to tier 3.
+        # See https://github.com/rust-lang/compiler-team/issues/648
+        #- target:
+        #    tuple: mips-unknown-linux-gnu
+        #    os: ubuntu-latest
+        #  norun: true
+        #- target:
+        #    tuple: mips64-unknown-linux-gnuabi64
+        #    os: ubuntu-latest
+        #  norun: true
+        #- target:
+        #    tuple: mips64el-unknown-linux-gnuabi64
+        #    os: ubuntu-latest
+        #  norun: true
+        #- target:
+        #    tuple: mipsel-unknown-linux-musl
+        #    os: ubuntu-latest
+        #  norun: true
+        - target:
+            tuple: aarch64-apple-darwin
+            os: macos-15
+          norun: true # https://github.com/rust-lang/stdarch/issues/1206
+        - target:
+            tuple: aarch64-apple-ios-macabi
+            os: macos-15
+          norun: true # https://github.com/rust-lang/stdarch/issues/1206
+
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install Rust
+      run: |
+        rustup update nightly --no-self-update
+        rustup default nightly
+      shell: bash
+      if: matrix.target.os != 'windows-11-arm'
+    - name: Install Rust for `windows-11-arm` runners
+      # The arm runners don't have Rust pre-installed (https://github.com/actions/partner-runner-images/issues/77)
+      run: |
+        curl https://sh.rustup.rs | sh -s -- -y --default-toolchain nightly
+        echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+      shell: bash
+      if: matrix.target.os == 'windows-11-arm'
+
+    - run: rustup target add ${{ matrix.target.tuple }}
+      shell: bash
+      if: matrix.build_std == ''
+    - run: |
+        rustup component add rust-src
+        echo "CARGO_UNSTABLE_BUILD_STD=std" >> $GITHUB_ENV
+      shell: bash
+      if: matrix.build_std != ''
+
+    # Configure some env vars based on matrix configuration
+    - run: echo "PROFILE=--profile=${{matrix.profile}}" >> $GITHUB_ENV
+      shell: bash
+    - run: echo "NORUN=1" >> $GITHUB_ENV
+      shell: bash
+      if: matrix.norun != '' || startsWith(matrix.target.tuple, 'thumb') || matrix.target.tuple == 'nvptx64-nvidia-cuda'
+    - run: echo "STDARCH_TEST_EVERYTHING=1" >> $GITHUB_ENV
+      shell: bash
+      if: matrix.test_everything != ''
+    - run: echo "STDARCH_DISABLE_ASSERT_INSTR=1" >> $GITHUB_ENV
+      shell: bash
+      if: matrix.disable_assert_instr != ''
+    - run: echo "NOSTD=1" >> $GITHUB_ENV
+      shell: bash
+      if: startsWith(matrix.target.tuple, 'thumb') || matrix.target.tuple == 'nvptx64-nvidia-cuda'
+
+    # Windows & OSX go straight to `run.sh` ...
+    - run: ./ci/run.sh
+      shell: bash
+      if: matrix.target.os != 'ubuntu-latest' || startsWith(matrix.target.tuple, 'thumb')
+      env:
+        TARGET: ${{ matrix.target.tuple }}
+
+    # ... while Linux goes to `run-docker.sh`
+    - run: ./ci/run-docker.sh ${{ matrix.target.tuple }}
+      shell: bash
+      if: matrix.target.os == 'ubuntu-latest' && !startsWith(matrix.target.tuple, 'thumb')
+      env:
+        TARGET: ${{ matrix.target.tuple }}
+
+  build-std-detect:
+    needs: [style]
+    name: Build std_detect
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v4
+    - name: Install Rust
+      run: rustup update nightly && rustup default nightly
+    - run: ./ci/build-std-detect.sh
+
+  conclusion:
+    needs:
+      - docs
+      - verify
+      - test
+      - build-std-detect
+    runs-on: ubuntu-latest
+    # We need to ensure this job does *not* get skipped if its dependencies fail,
+    # because a skipped job is considered a success by GitHub. So we have to
+    # overwrite `if:`. We use `!cancelled()` to ensure the job does still not get run
+    # when the workflow is canceled manually.
+    #
+    # ALL THE PREVIOUS JOBS NEED TO BE ADDED TO THE `needs` SECTION OF THIS JOB!
+    if: ${{ !cancelled() }} # make sure this is never "skipped"
+    steps:
+      - name: Conclusion
+        run: |
+          # Print the dependent jobs to see them in the CI log
+          jq -C <<< '${{ toJson(needs) }}'
+          # Check if all jobs that we depend on (in the needs array) were successful.
+          jq --exit-status 'all(.result == "success")' <<< '${{ toJson(needs) }}'

library/stdarch/.github/workflows/main.yml

@@ -0,0 +1,9 @@
+.*.swp
+target
+tags
+crates/stdarch-gen-arm/aarch64.rs
+crates/stdarch-gen-arm/arm.rs
+crates/stdarch-gen-loongarch/lasx.c
+crates/stdarch-gen-loongarch/lsx.c
+c_programs/*
+rust_programs/*