diff --git a/.cirrus.yml b/.cirrus.yml
deleted file mode 100644
index 220b3908..00000000
--- a/.cirrus.yml
+++ /dev/null
@@ -1,172 +0,0 @@
-only_if: $CIRRUS_TAG == '' && ($CIRRUS_PR != '' || $CIRRUS_BRANCH == 'main' || $CIRRUS_BRANCH == 'dev')
-auto_cancellation: $CIRRUS_PR != ''
-env:
-  CARGO_INCREMENTAL: '0'
-  CARGO_NET_RETRY: '10'
-  CARGO_TERM_COLOR: always
-  RUST_BACKTRACE: '1'
-  RUST_TEST_THREADS: '1'
-  RUSTDOCFLAGS: -D warnings
-  RUSTFLAGS: -D warnings
-  RUSTUP_MAX_RETRIES: '10'
-
-aarch64_linux_dynamic_linking_test_task:
-  matrix:
-    - name: test ($TARGET)
-      env:
-        TARGET: aarch64-unknown-linux-gnu
-      arm_container:
-        image: rust
-      setup_script:
-        - set -ex
-        - lscpu
-        - rustup toolchain add nightly --no-self-update && rustup default nightly
-        - apt-get -o Acquire::Retries=10 -qq update && apt-get -o Acquire::Retries=10 -o Dpkg::Use-Pty=0 install -y --no-install-recommends moreutils
-    - name: test ($TARGET, glibc 2.17)
-      env:
-        TARGET: aarch64-unknown-linux-gnu
-      arm_container:
-        # glibc 2.17 is the minimum glibc version that aarch64 support is available: https://sourceware.org/legacy-ml/libc-announce/2012/msg00001.html
-        image: centos:7
-      setup_script:
-        - set -ex
-        - lscpu
-        - yum install -y gcc moreutils
-        - curl --proto '=https' --tlsv1.2 -fsSL --retry 10 https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain nightly
-    - name: test ($TARGET, -C target-feature=-crt-static)
-      env:
-        TARGET: aarch64-unknown-linux-musl
-        RUSTDOCFLAGS: -D warnings -C target-feature=-crt-static
-        RUSTFLAGS: -D warnings -C target-feature=-crt-static
-      arm_container:
-        image: rust:alpine
-      setup_script:
-        - set -ex
-        - apk --no-cache add bash musl-dev util-linux moreutils
-        - lscpu
-        - rustup toolchain add nightly --no-self-update && rustup default nightly
-  test_script:
-    - |
-      [ ! -f $HOME/.cargo/env ] || . $HOME/.cargo/env
-    - set -ex
-    - ./tools/test.sh -vv
-    # We test doctest only once with the default build conditions because doctest is slow. Both api-test
-    # and src/tests have extended copies of doctest, so this will not reduce test coverage.
-    # outline-atomics is enabled by default on linux-gnu and linux-musl with dynamic linking.
-    - RUSTFLAGS="$RUSTFLAGS --cfg portable_atomic_no_outline_atomics" RUSTDOCFLAGS="$RUSTDOCFLAGS --cfg portable_atomic_no_outline_atomics" ./tools/test.sh -vv --tests
-    # +lse
-    # Neoverse N1 is ARMv8.2-a and doesn't support FEAT_LSE2.
-    # FEAT_LSE2 is tested on aarch64 macOS VM.
-    - RUSTFLAGS="$RUSTFLAGS -C target-feature=+lse" RUSTDOCFLAGS="$RUSTDOCFLAGS -C target-feature=+lse" ./tools/test.sh -vv --tests
-
-aarch64_linux_static_linking_test_task:
-  name: test ($TARGET)
-  env:
-    TARGET: aarch64-unknown-linux-musl
-  arm_container:
-    image: rust:alpine
-  setup_script:
-    - set -ex
-    - apk --no-cache add bash musl-dev util-linux moreutils
-    - lscpu
-    - rustup toolchain add nightly --no-self-update && rustup default nightly
-  test_script:
-    - set -ex
-    - ./tools/test.sh -vv
-    # We test doctest only once with the default build conditions because doctest is slow. Both api-test
-    # and src/tests have extended copies of doctest, so this will not reduce test coverage.
-    # outline-atomics is disabled by default on linux-musl with static linking.
-    - RUSTFLAGS="$RUSTFLAGS --cfg portable_atomic_outline_atomics" RUSTDOCFLAGS="$RUSTDOCFLAGS --cfg portable_atomic_outline_atomics" ./tools/test.sh -vv --tests
-    # +lse
-    # Neoverse N1 is ARMv8.2-a and doesn't support FEAT_LSE2.
-    # FEAT_LSE2 is tested on aarch64 macOS VM.
-    - RUSTFLAGS="$RUSTFLAGS -C target-feature=+lse" RUSTDOCFLAGS="$RUSTDOCFLAGS -C target-feature=+lse" ./tools/test.sh -vv --tests
-
-aarch64_macos_test_task:
-  name: test ($TARGET)
-  env:
-    TARGET: aarch64-apple-darwin
-  macos_instance:
-    image: ghcr.io/cirruslabs/macos-ventura-xcode
-  setup_script:
-    - set -ex
-    - sysctl hw.optional machdep.cpu
-    - brew install moreutils
-    - curl --proto '=https' --tlsv1.2 -fsSL --retry 10 --retry-connrefused https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain nightly
-  test_script:
-    - . $HOME/.cargo/env
-    - set -ex
-    # macOS is +lse,+lse2 by default
-    # Cirrus CI's aarch64 macOS VM is fast enough, so run ignored tests too.
-    - ./tools/test.sh -vv -- --include-ignored
-
-aarch64_linux_valgrind_task:
-  name: valgrind ($TARGET)
-  env:
-    TARGET: aarch64-unknown-linux-gnu
-  arm_container:
-    image: rust
-  setup_script:
-    - set -ex
-    - rustup toolchain add nightly --no-self-update && rustup default nightly
-    - apt-get -o Acquire::Retries=10 -qq update && apt-get -o Acquire::Retries=10 -o Dpkg::Use-Pty=0 install -y --no-install-recommends moreutils valgrind
-  test_script:
-    - set -ex
-    - ./tools/test.sh valgrind -vv
-    # We test doctest only once with the default build conditions because doctest is slow. Both api-test
-    # and src/tests have extended copies of doctest, so this will not reduce test coverage.
-    # outline-atomics is enabled by default on linux-gnu and linux-musl with dynamic linking.
-    - RUSTFLAGS="$RUSTFLAGS --cfg portable_atomic_no_outline_atomics" RUSTDOCFLAGS="$RUSTDOCFLAGS --cfg portable_atomic_no_outline_atomics" ./tools/test.sh valgrind -vv --tests
-    # +lse
-    # As of Valgrind 3.19, Valgrind supports atomic instructions of ARMv8.0 and ARMv8.1 (FEAT_LSE).
-    - RUSTFLAGS="$RUSTFLAGS -C target-feature=+lse" RUSTDOCFLAGS="$RUSTDOCFLAGS -C target-feature=+lse" ./tools/test.sh valgrind -vv --tests
-#
-# aarch64_linux_bench_task:
-#   name: bench ($TARGET)
-#   env:
-#     TARGET: aarch64-unknown-linux-gnu
-#   arm_container:
-#     image: rust
-#     cpu: 4
-#     memory: 12G
-#   setup_script:
-#     - set -ex
-#     - lscpu
-#     - rustup toolchain add nightly --no-self-update && rustup default nightly
-#   bench_script:
-#     - set -ex
-#     - cargo bench -vv --manifest-path bench/Cargo.toml
-#     - RUSTFLAGS="${RUSTFLAGS} -C target-feature=-outline-atomics --cfg portable_atomic_no_outline_atomics" cargo bench -vv --manifest-path bench/Cargo.toml
-#     - RUSTFLAGS="${RUSTFLAGS} -C target-feature=+lse" cargo bench -vv --manifest-path bench/Cargo.toml
-
-# x86_64_linux_bench_task:
-#   name: bench ($TARGET)
-#   env:
-#     TARGET: x86_64-unknown-linux-gnu
-#   container:
-#     image: rust
-#     cpu: 4
-#     memory: 12G
-#   setup_script:
-#     - set -ex
-#     - lscpu
-#     - rustup toolchain add nightly --no-self-update && rustup default nightly
-#   bench_script:
-#     - set -ex
-#     - cargo bench -vv --manifest-path bench/Cargo.toml
-#     - RUSTFLAGS="${RUSTFLAGS} -C target-feature=+cmpxchg16b" cargo bench -vv --manifest-path bench/Cargo.toml
-
-# aarch64_macos_bench_task:
-#   name: bench ($TARGET)
-#   env:
-#     TARGET: aarch64-apple-darwin
-#   macos_instance:
-#     image: ghcr.io/cirruslabs/macos-ventura-xcode
-#   setup_script:
-#     - set -ex
-#     - sysctl hw.optional machdep.cpu
-#     - curl --proto '=https' --tlsv1.2 -fsSL --retry 10 --retry-connrefused https://sh.rustup.rs | sh -s -- -y --profile minimal --default-toolchain nightly
-#   bench_script:
-#     - . $HOME/.cargo/env
-#     - set -ex
-#     - cargo bench -vv --manifest-path bench/Cargo.toml
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index d7f1fe0e..cb9f90a9 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -37,167 +37,170 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
-  check-external-types:
-    uses: taiki-e/workflows/.github/workflows/check-external-types.yml@main
-  deny:
-    uses: taiki-e/workflows/.github/workflows/deny.yml@main
-  docs:
-    uses: taiki-e/workflows/.github/workflows/docs.yml@main
-    with:
-      target: x86_64-unknown-linux-gnu,aarch64-unknown-linux-gnu,powerpc64le-unknown-linux-gnu,s390x-unknown-linux-gnu,armv5te-unknown-linux-gnueabi
-  msrv:
-    needs: tidy
-    uses: taiki-e/workflows/.github/workflows/msrv.yml@main
-    with:
-      event_name: ${{ github.event_name }}
-      # NB: sync with env.TEST_FEATURES
-      # Exclude serde and critical-section features because the MSRV when it is enabled depends on the MSRV of them
-      args: --features float,std --ignore-unknown-features
-  tidy:
-    uses: taiki-e/workflows/.github/workflows/tidy.yml@main
-    with:
-      # clippy is covered by TESTS=1 ./tools/build.sh
-      clippy: false
+  # check-external-types:
+  #   uses: taiki-e/workflows/.github/workflows/check-external-types.yml@main
+  # deny:
+  #   uses: taiki-e/workflows/.github/workflows/deny.yml@main
+  # docs:
+  #   uses: taiki-e/workflows/.github/workflows/docs.yml@main
+  #   with:
+  #     target: x86_64-unknown-linux-gnu,aarch64-unknown-linux-gnu,powerpc64le-unknown-linux-gnu,s390x-unknown-linux-gnu,armv5te-unknown-linux-gnueabi
+  # msrv:
+  #   needs: tidy
+  #   uses: taiki-e/workflows/.github/workflows/msrv.yml@main
+  #   with:
+  #     event_name: ${{ github.event_name }}
+  #     # NB: sync with env.TEST_FEATURES
+  #     # Exclude serde and critical-section features because the MSRV when it is enabled depends on the MSRV of them
+  #     args: --features float,std --ignore-unknown-features
+  # tidy:
+  #   uses: taiki-e/workflows/.github/workflows/tidy.yml@main
+  #   with:
+  #     # clippy is covered by TESTS=1 ./tools/build.sh
+  #     clippy: false
 
   test:
-    needs: tidy
+    # needs: tidy
     strategy:
       fail-fast: false
       matrix:
         include:
-          - rust: '1.56'
-          - rust: '1.59' # LLVM 13
-          - rust: '1.64' # LLVM 14
-          - rust: '1.69' # LLVM 15
-          - rust: stable # LLVM 16 (as of 1.70)
-          - rust: beta
-          - rust: nightly
-          - rust: nightly
-            os: macos-latest
-          - rust: nightly
-            os: windows-latest
-          - rust: nightly-x86_64-pc-windows-gnu
-            os: windows-latest
-          - rust: nightly-i686-pc-windows-msvc
-            os: windows-latest
-          - rust: nightly-i686-pc-windows-gnu
-            os: windows-latest
-          - rust: nightly
-            flags: -C panic=abort -Z panic_abort_tests
-          - rust: '1.59' # LLVM 13
-            target: aarch64-unknown-linux-gnu
-          - rust: '1.64' # LLVM 14
-            target: aarch64-unknown-linux-gnu
-          - rust: '1.69' # LLVM 15
-            target: aarch64-unknown-linux-gnu
-          - rust: stable
-            target: aarch64-unknown-linux-gnu
-          - rust: beta
-            target: aarch64-unknown-linux-gnu
-          - rust: nightly
-            target: aarch64-unknown-linux-gnu
-          - rust: nightly
-            target: aarch64_be-unknown-linux-gnu
-          - rust: stable
-            target: aarch64-unknown-linux-musl
-          - rust: stable
-            target: aarch64-unknown-linux-musl
-            flags: -C target-feature=-crt-static
-          - rust: nightly
-            target: aarch64-unknown-linux-musl
-          - rust: nightly
-            target: aarch64-unknown-linux-musl
-            flags: -C target-feature=-crt-static
-          - rust: stable
-            target: aarch64-linux-android
-          - rust: nightly
-            target: aarch64-linux-android
-          - rust: nightly
-            target: aarch64-pc-windows-gnullvm
-          - rust: '1.59'
-            target: armv5te-unknown-linux-gnueabi
-          - rust: stable
-            target: armv5te-unknown-linux-gnueabi
-          - rust: nightly
-            target: armv5te-unknown-linux-gnueabi
-          - rust: nightly
-            target: arm-unknown-linux-gnueabi
-          - rust: nightly
-            target: armv7-unknown-linux-gnueabi
-          - rust: nightly
-            target: armv7-unknown-linux-gnueabihf
-          - rust: nightly
-            target: armeb-unknown-linux-gnueabi
-          - rust: nightly
-            target: arm-linux-androideabi
-          - rust: nightly
-            target: i586-unknown-linux-gnu
-          - rust: nightly
-            target: i686-unknown-linux-gnu
-          - rust: nightly
-            target: loongarch64-unknown-linux-gnu
-          - rust: nightly
-            target: mips-unknown-linux-gnu
-          - rust: nightly
-            target: mipsel-unknown-linux-gnu
-          - rust: nightly
-            target: mips64-unknown-linux-gnuabi64
-          - rust: nightly
-            target: mips64el-unknown-linux-gnuabi64
-          - rust: nightly
-            target: mipsisa32r6-unknown-linux-gnu
-          - rust: nightly
-            target: mipsisa32r6el-unknown-linux-gnu
-          - rust: nightly
-            target: mipsisa64r6-unknown-linux-gnuabi64
-          - rust: nightly
-            target: mipsisa64r6el-unknown-linux-gnuabi64
-          - rust: nightly
-            target: powerpc-unknown-linux-gnu
-          - rust: nightly
-            target: powerpc64-unknown-linux-gnu
-          # - rust: nightly-2023-03-26 # Rust 1.70, LLVM 16
+          # - rust: '1.56'
+          # - rust: '1.59' # LLVM 13
+          # - rust: '1.64' # LLVM 14
+          # - rust: '1.69' # LLVM 15
+          # - rust: stable # LLVM 16 (as of 1.70)
+          # - rust: beta
+          # - rust: nightly
+          # - rust: nightly
+          #   os: macos-latest
+          # - rust: nightly
+          #   os: windows-latest
+          # - rust: nightly-x86_64-pc-windows-gnu
+          #   os: windows-latest
+          # - rust: nightly-i686-pc-windows-msvc
+          #   os: windows-latest
+          # - rust: nightly-i686-pc-windows-gnu
+          #   os: windows-latest
+          # - rust: nightly
+          #   flags: -C panic=abort -Z panic_abort_tests
+          # - rust: '1.59' # LLVM 13
+          #   target: aarch64-unknown-linux-gnu
+          # - rust: '1.64' # LLVM 14
+          #   target: aarch64-unknown-linux-gnu
+          # - rust: '1.69' # LLVM 15
+          #   target: aarch64-unknown-linux-gnu
+          # - rust: stable
+          #   target: aarch64-unknown-linux-gnu
+          # - rust: beta
+          #   target: aarch64-unknown-linux-gnu
+          # - rust: nightly
+          #   target: aarch64-unknown-linux-gnu
+          # - rust: nightly
+          #   target: aarch64_be-unknown-linux-gnu
+          # - rust: stable
+          #   target: aarch64-unknown-linux-musl
+          # - rust: stable
+          #   target: aarch64-unknown-linux-musl
+          #   flags: -C target-feature=-crt-static
+          # - rust: nightly
+          #   target: aarch64-unknown-linux-musl
+          # - rust: nightly
+          #   target: aarch64-unknown-linux-musl
+          #   flags: -C target-feature=-crt-static
+          # - rust: stable
+          #   target: aarch64-linux-android
+          # - rust: nightly
+          #   target: aarch64-linux-android
+          # - rust: nightly
+          #   target: aarch64-pc-windows-gnullvm
+          # - rust: '1.59'
+          #   target: armv5te-unknown-linux-gnueabi
+          # - rust: stable
+          #   target: armv5te-unknown-linux-gnueabi
+          # - rust: nightly
+          #   target: armv5te-unknown-linux-gnueabi
+          # - rust: nightly
+          #   target: arm-unknown-linux-gnueabi
+          # - rust: nightly
+          #   target: armv7-unknown-linux-gnueabi
+          # - rust: nightly
+          #   target: armv7-unknown-linux-gnueabihf
+          # - rust: nightly
+          #   target: armeb-unknown-linux-gnueabi
+          # - rust: nightly
+          #   target: arm-linux-androideabi
+          # - rust: nightly
+          #   target: i586-unknown-linux-gnu
+          # - rust: nightly
+          #   target: i686-unknown-linux-gnu
+          # - rust: nightly
+          #   target: loongarch64-unknown-linux-gnu
+          # - rust: nightly
+          #   target: mips-unknown-linux-gnu
+          # - rust: nightly
+          #   target: mipsel-unknown-linux-gnu
+          # - rust: nightly
+          #   target: mips64-unknown-linux-gnuabi64
+          # - rust: nightly
+          #   target: mips64el-unknown-linux-gnuabi64
+          # - rust: nightly
+          #   target: mipsisa32r6-unknown-linux-gnu
+          # - rust: nightly
+          #   target: mipsisa32r6el-unknown-linux-gnu
+          # - rust: nightly
+          #   target: mipsisa64r6-unknown-linux-gnuabi64
+          # - rust: nightly
+          #   target: mipsisa64r6el-unknown-linux-gnuabi64
+          # - rust: nightly
+          #   target: powerpc-unknown-linux-gnu
+          # - rust: nightly
           #   target: powerpc64-unknown-linux-gnu
-          - rust: nightly-2023-03-25 # Rust 1.70, LLVM 15
-            target: powerpc64-unknown-linux-gnu
-          # - rust: nightly-2022-08-13 # Rust 1.65, LLVM 15
+          # # - rust: nightly-2023-03-26 # Rust 1.70, LLVM 16
+          # #   target: powerpc64-unknown-linux-gnu
+          # - rust: nightly-2023-03-25 # Rust 1.70, LLVM 15
           #   target: powerpc64-unknown-linux-gnu
-          - rust: nightly-2022-08-12 # Rust 1.65, LLVM 14
-            target: powerpc64-unknown-linux-gnu
-          # - rust: nightly-2022-02-18 # Rust 1.60, LLVM 14
+          # # - rust: nightly-2022-08-13 # Rust 1.65, LLVM 15
+          # #   target: powerpc64-unknown-linux-gnu
+          # - rust: nightly-2022-08-12 # Rust 1.65, LLVM 14
           #   target: powerpc64-unknown-linux-gnu
-          # - rust: nightly-2022-02-17 # Rust 1.60, LLVM 13
+          # # - rust: nightly-2022-02-18 # Rust 1.60, LLVM 14
+          # #   target: powerpc64-unknown-linux-gnu
+          # # - rust: nightly-2022-02-17 # Rust 1.60, LLVM 13
+          # #   target: powerpc64-unknown-linux-gnu
+          # - rust: nightly-2022-02-13 # Rust 1.60, LLVM 13 (oldest version we can use asm_experimental_arch on this target)
           #   target: powerpc64-unknown-linux-gnu
-          - rust: nightly-2022-02-13 # Rust 1.60, LLVM 13 (oldest version we can use asm_experimental_arch on this target)
-            target: powerpc64-unknown-linux-gnu
-          - rust: nightly
-            target: powerpc64le-unknown-linux-gnu
-          # - rust: nightly-2023-03-26 # Rust 1.70, LLVM 16
+          # - rust: nightly
           #   target: powerpc64le-unknown-linux-gnu
-          - rust: nightly-2023-03-25 # Rust 1.70, LLVM 15
-            target: powerpc64le-unknown-linux-gnu
-          # - rust: nightly-2022-08-13 # Rust 1.65, LLVM 15
+          # # - rust: nightly-2023-03-26 # Rust 1.70, LLVM 16
+          # #   target: powerpc64le-unknown-linux-gnu
+          # - rust: nightly-2023-03-25 # Rust 1.70, LLVM 15
           #   target: powerpc64le-unknown-linux-gnu
-          - rust: nightly-2022-08-12 # Rust 1.65, LLVM 14
-            target: powerpc64le-unknown-linux-gnu
-          # - rust: nightly-2022-02-18 # Rust 1.60, LLVM 14
+          # # - rust: nightly-2022-08-13 # Rust 1.65, LLVM 15
+          # #   target: powerpc64le-unknown-linux-gnu
+          # - rust: nightly-2022-08-12 # Rust 1.65, LLVM 14
           #   target: powerpc64le-unknown-linux-gnu
-          # - rust: nightly-2022-02-17 # Rust 1.60, LLVM 13
+          # # - rust: nightly-2022-02-18 # Rust 1.60, LLVM 14
+          # #   target: powerpc64le-unknown-linux-gnu
+          # # - rust: nightly-2022-02-17 # Rust 1.60, LLVM 13
+          # #   target: powerpc64le-unknown-linux-gnu
+          # - rust: nightly-2022-02-13 # Rust 1.60, LLVM 13 (oldest version we can use asm_experimental_arch on this target)
           #   target: powerpc64le-unknown-linux-gnu
-          - rust: nightly-2022-02-13 # Rust 1.60, LLVM 13 (oldest version we can use asm_experimental_arch on this target)
-            target: powerpc64le-unknown-linux-gnu
-          - rust: nightly
-            target: riscv32gc-unknown-linux-gnu
-          - rust: nightly
-            target: riscv64gc-unknown-linux-gnu
-          - rust: nightly
-            target: s390x-unknown-linux-gnu
-          - rust: nightly-2023-05-09 # Rust 1.71, LLVM 16 (oldest version we can use asm_experimental_arch on this target)
-            target: s390x-unknown-linux-gnu
-          - rust: nightly
-            target: sparc64-unknown-linux-gnu
-          - rust: nightly
-            target: thumbv7neon-unknown-linux-gnueabihf
+          # - rust: nightly
+          #   target: riscv32gc-unknown-linux-gnu
+          # - rust: nightly
+          #   target: riscv64gc-unknown-linux-gnu
+          # - rust: nightly
+          #   target: s390x-unknown-linux-gnu
+          # - rust: nightly-2023-05-09 # Rust 1.71, LLVM 16 (oldest version we can use asm_experimental_arch on this target)
+          #   target: s390x-unknown-linux-gnu
+          - rust: nightly
+            target: sparc-unknown-linux-gnu
+            flags: --cfg crossbeam_no_atomic_64 # TODO: needed until https://github.com/crossbeam-rs/crossbeam/commit/d7c1ac2cdf3089275238908f61b051bf2e0becbd released
+          # - rust: nightly
+          #   target: sparc64-unknown-linux-gnu
+          # - rust: nightly
+          #   target: thumbv7neon-unknown-linux-gnueabihf
     runs-on: ${{ matrix.os || 'ubuntu-latest' }}
     timeout-minutes: 60
     steps:
@@ -222,7 +225,7 @@ jobs:
       - uses: taiki-e/install-action@cargo-minimal-versions
       - uses: taiki-e/install-action@cargo-careful
         if: startsWith(matrix.rust, 'nightly')
-      - uses: taiki-e/setup-cross-toolchain-action@v1
+      - uses: taiki-e/setup-cross-toolchain-action@main
         with:
           target: ${{ matrix.target }}
         if: matrix.target != ''
@@ -328,278 +331,278 @@ jobs:
 
       - run: cargo minimal-versions build -vvv --workspace --no-private --features $TEST_FEATURES --ignore-unknown-features $TARGET $BUILD_STD $RELEASE
 
-  test-bsd:
-    needs: tidy
-    name: test (${{ matrix.target }}${{ matrix.version }})
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - target: aarch64-unknown-freebsd
-            os: freebsd
-            version: '12.4'
-          - target: aarch64-unknown-freebsd
-            os: freebsd
-            version: '13.2'
-          - target: aarch64-unknown-openbsd
-            os: openbsd
-            version: '7.3'
-    runs-on: ubuntu-latest
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          persist-credentials: false
-      - uses: taiki-e/cross-platform-actions-action@neoverse-v1
-        with:
-          environment_variables: CARGO_INCREMENTAL CARGO_NET_RETRY CARGO_TERM_COLOR RUST_BACKTRACE RUST_TEST_THREADS RUSTDOCFLAGS RUSTFLAGS RUSTUP_MAX_RETRIES TEST_FEATURES
-          operating_system: ${{ matrix.os }}
-          architecture: aarch64
-          version: ${{ matrix.version }}
-          shell: bash
-          run: |
-            set -euxo pipefail
-            export RUSTFLAGS="${RUSTFLAGS} --cfg qemu"
-            # AArch64 FreeBSD/OpenBSD are tier 3 targets, so install rust from package manager instead of rustup.
-            case "$(uname -s)" in
-              FreeBSD) sudo pkg install -y rust ;;
-              OpenBSD)
-                # As of OpenBSD 7.3, the built-in git library is very slow.
-                export CARGO_NET_GIT_FETCH_WITH_CLI=true
-                # OpenBSD 7.3's rustc version is 1.68, which sparse protocol is not default protocol.
-                export CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
-                sudo pkg_add git rust
-                ;;
-            esac
-            rustc -vV
-            cargo test --features std --tests -- aarch64
+  # test-bsd:
+  #   needs: tidy
+  #   name: test (${{ matrix.target }}${{ matrix.version }})
+  #   strategy:
+  #     fail-fast: false
+  #     matrix:
+  #       include:
+  #         - target: aarch64-unknown-freebsd
+  #           os: freebsd
+  #           version: '12.4'
+  #         - target: aarch64-unknown-freebsd
+  #           os: freebsd
+  #           version: '13.2'
+  #         - target: aarch64-unknown-openbsd
+  #           os: openbsd
+  #           version: '7.3'
+  #   runs-on: ubuntu-latest
+  #   timeout-minutes: 60
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #       with:
+  #         persist-credentials: false
+  #     - uses: taiki-e/cross-platform-actions-action@neoverse-v1
+  #       with:
+  #         environment_variables: CARGO_INCREMENTAL CARGO_NET_RETRY CARGO_TERM_COLOR RUST_BACKTRACE RUST_TEST_THREADS RUSTDOCFLAGS RUSTFLAGS RUSTUP_MAX_RETRIES TEST_FEATURES
+  #         operating_system: ${{ matrix.os }}
+  #         architecture: aarch64
+  #         version: ${{ matrix.version }}
+  #         shell: bash
+  #         run: |
+  #           set -euxo pipefail
+  #           export RUSTFLAGS="${RUSTFLAGS} --cfg qemu"
+  #           # AArch64 FreeBSD/OpenBSD are tier 3 targets, so install rust from package manager instead of rustup.
+  #           case "$(uname -s)" in
+  #             FreeBSD) sudo pkg install -y rust ;;
+  #             OpenBSD)
+  #               # As of OpenBSD 7.3, the built-in git library is very slow.
+  #               export CARGO_NET_GIT_FETCH_WITH_CLI=true
+  #               # OpenBSD 7.3's rustc version is 1.68, which sparse protocol is not default protocol.
+  #               export CARGO_REGISTRIES_CRATES_IO_PROTOCOL=sparse
+  #               sudo pkg_add git rust
+  #               ;;
+  #           esac
+  #           rustc -vV
+  #           cargo test --features std --tests -- aarch64
 
-  build:
-    needs: tidy
-    name: build (${{ matrix.name || matrix.rust }})
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - rust: '1.34'
-          - rust: '1.59'
-          - rust: stable
-          - rust: beta
-          - rust: nightly
-          # The oldest nightly that can compile this crate is nightly-2019-01-27
-          # which Atomic{I,U}{8,16,32,64} stabilized.
-          # https://github.com/rust-lang/rust/pull/57425
-          # Note: Old nightly compilers are essentially fragile, so support for
-          # them is on a best-effort basis.
-          - rust: nightly-2019-01-27
-          # https://github.com/taiki-e/portable-atomic/pull/52
-          - rust: nightly-2020-06-21
-          # for AVR: https://github.com/rust-lang/compiler-builtins/issues/400
-          - rust: nightly-2020-12-26
-          # Check that test suite can be built
-          - name: nightly, --tests
-            rust: nightly
-            tests: 1
-          # Check that this crate can be built for all builtin targets
-          - name: stable, all tier1/tier2
-            rust: stable
-            target-group: tier1/tier2
-            # Skip targets that also checked by other matrix.
-            skip-default-target: 1
-          - name: nightly, all tier1/tier2
-            rust: nightly
-            target-group: tier1/tier2
-            skip-default-target: 1
-          - name: nightly, all tier3
-            rust: nightly
-            target-group: tier3
-            skip-default-target: 1
-    runs-on: ubuntu-latest
-    timeout-minutes: 120 # TODO
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          persist-credentials: false
-      - uses: taiki-e/github-actions/free-device-space@main
-        if: matrix.target-group == ''
-      - name: Install Rust
-        run: rustup toolchain add ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
-      - uses: taiki-e/install-action@cargo-hack
-      - run: tools/build.sh
-        env:
-          TESTS: ${{ matrix.tests }}
-          TARGET_GROUP: ${{ matrix.target-group }}
-          SKIP_DEFAULT_TARGET: ${{ matrix.skip-default-target }}
+  # build:
+  #   needs: tidy
+  #   name: build (${{ matrix.name || matrix.rust }})
+  #   strategy:
+  #     fail-fast: false
+  #     matrix:
+  #       include:
+  #         - rust: '1.34'
+  #         - rust: '1.59'
+  #         - rust: stable
+  #         - rust: beta
+  #         - rust: nightly
+  #         # The oldest nightly that can compile this crate is nightly-2019-01-27
+  #         # which Atomic{I,U}{8,16,32,64} stabilized.
+  #         # https://github.com/rust-lang/rust/pull/57425
+  #         # Note: Old nightly compilers are essentially fragile, so support for
+  #         # them is on a best-effort basis.
+  #         - rust: nightly-2019-01-27
+  #         # https://github.com/taiki-e/portable-atomic/pull/52
+  #         - rust: nightly-2020-06-21
+  #         # for AVR: https://github.com/rust-lang/compiler-builtins/issues/400
+  #         - rust: nightly-2020-12-26
+  #         # Check that test suite can be built
+  #         - name: nightly, --tests
+  #           rust: nightly
+  #           tests: 1
+  #         # Check that this crate can be built for all builtin targets
+  #         - name: stable, all tier1/tier2
+  #           rust: stable
+  #           target-group: tier1/tier2
+  #           # Skip targets that also checked by other matrix.
+  #           skip-default-target: 1
+  #         - name: nightly, all tier1/tier2
+  #           rust: nightly
+  #           target-group: tier1/tier2
+  #           skip-default-target: 1
+  #         - name: nightly, all tier3
+  #           rust: nightly
+  #           target-group: tier3
+  #           skip-default-target: 1
+  #   runs-on: ubuntu-latest
+  #   timeout-minutes: 120 # TODO
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #       with:
+  #         persist-credentials: false
+  #     - uses: taiki-e/github-actions/free-device-space@main
+  #       if: matrix.target-group == ''
+  #     - name: Install Rust
+  #       run: rustup toolchain add ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
+  #     - uses: taiki-e/install-action@cargo-hack
+  #     - run: tools/build.sh
+  #       env:
+  #         TESTS: ${{ matrix.tests }}
+  #         TARGET_GROUP: ${{ matrix.target-group }}
+  #         SKIP_DEFAULT_TARGET: ${{ matrix.skip-default-target }}
 
-  no-std:
-    needs: tidy
-    strategy:
-      fail-fast: false
-      matrix:
-        rust:
-          - '1.64'
-          - stable
-          - nightly
-    runs-on: ubuntu-latest
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          persist-credentials: false
-      - name: Install Rust
-        run: rustup toolchain add ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
-      - uses: taiki-e/install-action@cargo-hack
-        if: startsWith(matrix.rust, 'nightly')
-      - uses: taiki-e/install-action@v2
-        with:
-          tool: espup
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        if: startsWith(matrix.rust, 'nightly')
-      - run: |
-          set -euxo pipefail
-          sudo apt-get -o Acquire::Retries=10 -qq update && sudo apt-get -o Acquire::Retries=10 -o Dpkg::Use-Pty=0 install -y --no-install-recommends \
-            avr-libc \
-            gcc-avr \
-            qemu-system-arm \
-            qemu-system-misc \
-            simavr
-          # APT's qemu package doesn't provide firmware for riscv32: https://packages.ubuntu.com/en/jammy/all/qemu-system-data/filelist
-          OPENSBI_VERSION=1.3.1 # https://github.com/riscv-software-src/opensbi/releases
-          curl --proto '=https' --tlsv1.2 -fsSL --retry 10 --retry-connrefused "https://github.com/riscv-software-src/opensbi/releases/download/v${OPENSBI_VERSION}/opensbi-${OPENSBI_VERSION}-rv-bin.tar.xz" \
-            | tar xJf -
-          sudo mv "opensbi-${OPENSBI_VERSION}-rv-bin/share/opensbi/ilp32/generic/firmware/fw_dynamic.bin" /usr/share/qemu/opensbi-riscv32-generic-fw_dynamic.bin
-          sudo mv "opensbi-${OPENSBI_VERSION}-rv-bin/share/opensbi/ilp32/generic/firmware/fw_dynamic.elf" /usr/share/qemu/opensbi-riscv32-generic-fw_dynamic.elf
-          rm -rf "opensbi-${OPENSBI_VERSION}-rv-bin"
-      - run: espup install --targets esp32
-        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
-        if: startsWith(matrix.rust, 'nightly')
-      - run: tools/no-std.sh
-      - run: tools/build.sh +esp xtensa-esp32-none-elf
-        if: startsWith(matrix.rust, 'nightly')
-      - run: tools/no-std.sh +esp xtensa-esp32-none-elf
-        if: startsWith(matrix.rust, 'nightly')
+  # no-std:
+  #   needs: tidy
+  #   strategy:
+  #     fail-fast: false
+  #     matrix:
+  #       rust:
+  #         - '1.64'
+  #         - stable
+  #         - nightly
+  #   runs-on: ubuntu-latest
+  #   timeout-minutes: 60
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #       with:
+  #         persist-credentials: false
+  #     - name: Install Rust
+  #       run: rustup toolchain add ${{ matrix.rust }} --no-self-update && rustup default ${{ matrix.rust }}
+  #     - uses: taiki-e/install-action@cargo-hack
+  #       if: startsWith(matrix.rust, 'nightly')
+  #     - uses: taiki-e/install-action@v2
+  #       with:
+  #         tool: espup
+  #       env:
+  #         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  #       if: startsWith(matrix.rust, 'nightly')
+  #     - run: |
+  #         set -euxo pipefail
+  #         sudo apt-get -o Acquire::Retries=10 -qq update && sudo apt-get -o Acquire::Retries=10 -o Dpkg::Use-Pty=0 install -y --no-install-recommends \
+  #           avr-libc \
+  #           gcc-avr \
+  #           qemu-system-arm \
+  #           qemu-system-misc \
+  #           simavr
+  #         # APT's qemu package doesn't provide firmware for riscv32: https://packages.ubuntu.com/en/jammy/all/qemu-system-data/filelist
+  #         OPENSBI_VERSION=1.3.1 # https://github.com/riscv-software-src/opensbi/releases
+  #         curl --proto '=https' --tlsv1.2 -fsSL --retry 10 --retry-connrefused "https://github.com/riscv-software-src/opensbi/releases/download/v${OPENSBI_VERSION}/opensbi-${OPENSBI_VERSION}-rv-bin.tar.xz" \
+  #           | tar xJf -
+  #         sudo mv "opensbi-${OPENSBI_VERSION}-rv-bin/share/opensbi/ilp32/generic/firmware/fw_dynamic.bin" /usr/share/qemu/opensbi-riscv32-generic-fw_dynamic.bin
+  #         sudo mv "opensbi-${OPENSBI_VERSION}-rv-bin/share/opensbi/ilp32/generic/firmware/fw_dynamic.elf" /usr/share/qemu/opensbi-riscv32-generic-fw_dynamic.elf
+  #         rm -rf "opensbi-${OPENSBI_VERSION}-rv-bin"
+  #     - run: espup install --targets esp32
+  #       env:
+  #         GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  #       if: startsWith(matrix.rust, 'nightly')
+  #     - run: tools/no-std.sh
+  #     - run: tools/build.sh +esp xtensa-esp32-none-elf
+  #       if: startsWith(matrix.rust, 'nightly')
+  #     - run: tools/no-std.sh +esp xtensa-esp32-none-elf
+  #       if: startsWith(matrix.rust, 'nightly')
 
-  miri:
-    needs: tidy
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - target: x86_64-unknown-linux-gnu
-          - target: x86_64-unknown-linux-gnu
-            flags: -C target-feature=+cmpxchg16b
-          - target: aarch64-unknown-linux-gnu
-          - target: i686-unknown-linux-gnu
-          - target: powerpc64le-unknown-linux-gnu
-          - target: s390x-unknown-linux-gnu
-    runs-on: ubuntu-latest
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          persist-credentials: false
-      - name: Install Rust
-        run: rustup toolchain add nightly --no-self-update --component miri && rustup default nightly
-      - run: sudo apt-get -o Acquire::Retries=10 -qq update && sudo apt-get -o Acquire::Retries=10 -o Dpkg::Use-Pty=0 install -y --no-install-recommends moreutils
-      - run: echo "TARGET=--target=${{ matrix.target }}" >>"${GITHUB_ENV}"
-        if: matrix.target != 'x86_64-unknown-linux-gnu'
-      - run: tools/test.sh miri $TARGET
-        env:
-          RUSTDOCFLAGS: ${{ env.RUSTDOCFLAGS }} ${{ matrix.flags }}
-          RUSTFLAGS: ${{ env.RUSTFLAGS }} ${{ matrix.flags }}
+  # miri:
+  #   needs: tidy
+  #   strategy:
+  #     fail-fast: false
+  #     matrix:
+  #       include:
+  #         - target: x86_64-unknown-linux-gnu
+  #         - target: x86_64-unknown-linux-gnu
+  #           flags: -C target-feature=+cmpxchg16b
+  #         - target: aarch64-unknown-linux-gnu
+  #         - target: i686-unknown-linux-gnu
+  #         - target: powerpc64le-unknown-linux-gnu
+  #         - target: s390x-unknown-linux-gnu
+  #   runs-on: ubuntu-latest
+  #   timeout-minutes: 60
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #       with:
+  #         persist-credentials: false
+  #     - name: Install Rust
+  #       run: rustup toolchain add nightly --no-self-update --component miri && rustup default nightly
+  #     - run: sudo apt-get -o Acquire::Retries=10 -qq update && sudo apt-get -o Acquire::Retries=10 -o Dpkg::Use-Pty=0 install -y --no-install-recommends moreutils
+  #     - run: echo "TARGET=--target=${{ matrix.target }}" >>"${GITHUB_ENV}"
+  #       if: matrix.target != 'x86_64-unknown-linux-gnu'
+  #     - run: tools/test.sh miri $TARGET
+  #       env:
+  #         RUSTDOCFLAGS: ${{ env.RUSTDOCFLAGS }} ${{ matrix.flags }}
+  #         RUSTFLAGS: ${{ env.RUSTFLAGS }} ${{ matrix.flags }}
 
-  san:
-    needs: tidy
-    strategy:
-      fail-fast: false
-      matrix:
-        sanitizer:
-          - address
-          - memory
-          - thread
-    runs-on: ubuntu-latest
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          persist-credentials: false
-      - name: Install Rust
-        run: rustup toolchain add nightly --no-self-update && rustup default nightly
-      - run: sudo apt-get -o Acquire::Retries=10 -qq update && sudo apt-get -o Acquire::Retries=10 -o Dpkg::Use-Pty=0 install -y --no-install-recommends moreutils
-      - run: |
-          echo "ASAN_OPTIONS=detect_stack_use_after_return=1" >>"${GITHUB_ENV}"
-          echo "RUSTFLAGS=${RUSTFLAGS} -Z sanitizer=address" >>"${GITHUB_ENV}"
-          echo "RUSTDOCFLAGS=${RUSTDOCFLAGS} -Z sanitizer=address" >>"${GITHUB_ENV}"
-        if: matrix.sanitizer == 'address'
-      - run: |
-          echo "MSAN_OPTIONS=verbosity=2" >>"${GITHUB_ENV}"
-          echo "RUSTFLAGS=${RUSTFLAGS} -Z sanitizer=memory -Z sanitizer-memory-track-origins" >>"${GITHUB_ENV}"
-          echo "RUSTDOCFLAGS=${RUSTDOCFLAGS} -Z sanitizer=memory -Z sanitizer-memory-track-origins" >>"${GITHUB_ENV}"
-        if: matrix.sanitizer == 'memory'
-      - run: |
-          echo "RUSTFLAGS=${RUSTFLAGS} -Z sanitizer=thread" >>"${GITHUB_ENV}"
-          echo "RUSTDOCFLAGS=${RUSTDOCFLAGS} -Z sanitizer=thread" >>"${GITHUB_ENV}"
-        if: matrix.sanitizer == 'thread'
-      - run: tools/test.sh -Z build-std -vv
-      # We test doctest only once with the default build conditions because doctest is slow. Both api-test
-      # and src/tests have extended copies of doctest, so this will not reduce test coverage.
-      # +cmpxchg16b
-      - run: tools/test.sh -Z build-std -vv --tests
-        env:
-          RUSTDOCFLAGS: ${{ env.RUSTDOCFLAGS }} -C target-feature=+cmpxchg16b --cfg portable_atomic_no_outline_atomics
-          RUSTFLAGS: ${{ env.RUSTFLAGS }} -C target-feature=+cmpxchg16b --cfg portable_atomic_no_outline_atomics
+  # san:
+  #   needs: tidy
+  #   strategy:
+  #     fail-fast: false
+  #     matrix:
+  #       sanitizer:
+  #         - address
+  #         - memory
+  #         - thread
+  #   runs-on: ubuntu-latest
+  #   timeout-minutes: 60
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #       with:
+  #         persist-credentials: false
+  #     - name: Install Rust
+  #       run: rustup toolchain add nightly --no-self-update && rustup default nightly
+  #     - run: sudo apt-get -o Acquire::Retries=10 -qq update && sudo apt-get -o Acquire::Retries=10 -o Dpkg::Use-Pty=0 install -y --no-install-recommends moreutils
+  #     - run: |
+  #         echo "ASAN_OPTIONS=detect_stack_use_after_return=1" >>"${GITHUB_ENV}"
+  #         echo "RUSTFLAGS=${RUSTFLAGS} -Z sanitizer=address" >>"${GITHUB_ENV}"
+  #         echo "RUSTDOCFLAGS=${RUSTDOCFLAGS} -Z sanitizer=address" >>"${GITHUB_ENV}"
+  #       if: matrix.sanitizer == 'address'
+  #     - run: |
+  #         echo "MSAN_OPTIONS=verbosity=2" >>"${GITHUB_ENV}"
+  #         echo "RUSTFLAGS=${RUSTFLAGS} -Z sanitizer=memory -Z sanitizer-memory-track-origins" >>"${GITHUB_ENV}"
+  #         echo "RUSTDOCFLAGS=${RUSTDOCFLAGS} -Z sanitizer=memory -Z sanitizer-memory-track-origins" >>"${GITHUB_ENV}"
+  #       if: matrix.sanitizer == 'memory'
+  #     - run: |
+  #         echo "RUSTFLAGS=${RUSTFLAGS} -Z sanitizer=thread" >>"${GITHUB_ENV}"
+  #         echo "RUSTDOCFLAGS=${RUSTDOCFLAGS} -Z sanitizer=thread" >>"${GITHUB_ENV}"
+  #       if: matrix.sanitizer == 'thread'
+  #     - run: tools/test.sh -Z build-std -vv
+  #     # We test doctest only once with the default build conditions because doctest is slow. Both api-test
+  #     # and src/tests have extended copies of doctest, so this will not reduce test coverage.
+  #     # +cmpxchg16b
+  #     - run: tools/test.sh -Z build-std -vv --tests
+  #       env:
+  #         RUSTDOCFLAGS: ${{ env.RUSTDOCFLAGS }} -C target-feature=+cmpxchg16b --cfg portable_atomic_no_outline_atomics
+  #         RUSTFLAGS: ${{ env.RUSTFLAGS }} -C target-feature=+cmpxchg16b --cfg portable_atomic_no_outline_atomics
 
-  valgrind:
-    needs: tidy
-    runs-on: ubuntu-latest
-    timeout-minutes: 60
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          persist-credentials: false
-      - name: Install Rust
-        run: rustup toolchain add nightly --no-self-update && rustup default nightly
-      - run: sudo apt-get -o Acquire::Retries=10 -qq update && sudo apt-get -o Acquire::Retries=10 -o Dpkg::Use-Pty=0 install -y --no-install-recommends moreutils
-      - uses: taiki-e/install-action@valgrind
-      - run: tools/test.sh valgrind -vv
-      # We test doctest only once with the default build conditions because doctest is slow. Both api-test
-      # and src/tests have extended copies of doctest, so this will not reduce test coverage.
-      # +cmpxchg16b
-      - run: tools/test.sh valgrind -vv --tests
-        env:
-          # vmovdqa load/store path has been tested above, disable outline-atomics and test cmpxchg16b load/store path.
-          RUSTDOCFLAGS: ${{ env.RUSTDOCFLAGS }} -C target-feature=+cmpxchg16b --cfg portable_atomic_no_outline_atomics
-          RUSTFLAGS: ${{ env.RUSTFLAGS }} -C target-feature=+cmpxchg16b --cfg portable_atomic_no_outline_atomics
+  # valgrind:
+  #   needs: tidy
+  #   runs-on: ubuntu-latest
+  #   timeout-minutes: 60
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #       with:
+  #         persist-credentials: false
+  #     - name: Install Rust
+  #       run: rustup toolchain add nightly --no-self-update && rustup default nightly
+  #     - run: sudo apt-get -o Acquire::Retries=10 -qq update && sudo apt-get -o Acquire::Retries=10 -o Dpkg::Use-Pty=0 install -y --no-install-recommends moreutils
+  #     - uses: taiki-e/install-action@valgrind
+  #     - run: tools/test.sh valgrind -vv
+  #     # We test doctest only once with the default build conditions because doctest is slow. Both api-test
+  #     # and src/tests have extended copies of doctest, so this will not reduce test coverage.
+  #     # +cmpxchg16b
+  #     - run: tools/test.sh valgrind -vv --tests
+  #       env:
+  #         # vmovdqa load/store path has been tested above, disable outline-atomics and test cmpxchg16b load/store path.
+  #         RUSTDOCFLAGS: ${{ env.RUSTDOCFLAGS }} -C target-feature=+cmpxchg16b --cfg portable_atomic_no_outline_atomics
+  #         RUSTFLAGS: ${{ env.RUSTFLAGS }} -C target-feature=+cmpxchg16b --cfg portable_atomic_no_outline_atomics
 
-  codegen:
-    needs: tidy
-    runs-on: ubuntu-latest
-    timeout-minutes: 60
-    permissions:
-      contents: write
-      pull-requests: write
-    steps:
-      - uses: actions/checkout@v4
-        with:
-          persist-credentials: false
-      - name: Install Rust
-        run: rustup toolchain add nightly --no-self-update --component rustfmt && rustup default nightly
-      - run: tools/no_atomic.sh
-      - run: tools/gen.sh
-      - id: diff
-        run: tools/ci/gen.sh
-        if: github.repository_owner == 'taiki-e' && (github.event_name == 'schedule' || github.event_name == 'push' && github.ref == 'refs/heads/main')
-      - uses: peter-evans/create-pull-request@v5
-        with:
-          title: Update generated code
-          body: |
-            Auto-generated by [create-pull-request][1]
-            [Please close and immediately reopen this pull request to run CI.][2]
+  # codegen:
+  #   needs: tidy
+  #   runs-on: ubuntu-latest
+  #   timeout-minutes: 60
+  #   permissions:
+  #     contents: write
+  #     pull-requests: write
+  #   steps:
+  #     - uses: actions/checkout@v4
+  #       with:
+  #         persist-credentials: false
+  #     - name: Install Rust
+  #       run: rustup toolchain add nightly --no-self-update --component rustfmt && rustup default nightly
+  #     - run: tools/no_atomic.sh
+  #     - run: tools/gen.sh
+  #     - id: diff
+  #       run: tools/ci/gen.sh
+  #       if: github.repository_owner == 'taiki-e' && (github.event_name == 'schedule' || github.event_name == 'push' && github.ref == 'refs/heads/main')
+  #     - uses: peter-evans/create-pull-request@v5
+  #       with:
+  #         title: Update generated code
+  #         body: |
+  #           Auto-generated by [create-pull-request][1]
+  #           [Please close and immediately reopen this pull request to run CI.][2]
 
-            [1]: https://github.com/peter-evans/create-pull-request
-            [2]: https://github.com/peter-evans/create-pull-request/blob/HEAD/docs/concepts-guidelines.md#workarounds-to-trigger-further-workflow-runs
-          branch: update-generated-code
-        if: github.repository_owner == 'taiki-e' && (github.event_name == 'schedule' || github.event_name == 'push' && github.ref == 'refs/heads/main') && steps.diff.outputs.success == 'false'
-      - run: git add -N . && git diff --exit-code
+  #           [1]: https://github.com/peter-evans/create-pull-request
+  #           [2]: https://github.com/peter-evans/create-pull-request/blob/HEAD/docs/concepts-guidelines.md#workarounds-to-trigger-further-workflow-runs
+  #         branch: update-generated-code
+  #       if: github.repository_owner == 'taiki-e' && (github.event_name == 'schedule' || github.event_name == 'push' && github.ref == 'refs/heads/main') && steps.diff.outputs.success == 'false'
+  #     - run: git add -N . && git diff --exit-code
diff --git a/src/imp/fallback/mod.rs b/src/imp/fallback/mod.rs
index 8a8e7686..5522e075 100644
--- a/src/imp/fallback/mod.rs
+++ b/src/imp/fallback/mod.rs
@@ -420,7 +420,9 @@ mod tests {
         test_atomic_int!(i64);
         test_atomic_int!(u64);
     }
+    #[cfg(not(target_arch = "sparc"))] // TODO: LLVM bug: SIGILL on 128-bit add
     test_atomic_int!(i128);
+    #[cfg(not(target_arch = "sparc"))] // TODO: LLVM bug: SIGILL on 128-bit add
     test_atomic_int!(u128);
 
     // load/store/swap implementation is not affected by signedness, so it is
diff --git a/src/imp/interrupt/mod.rs b/src/imp/interrupt/mod.rs
index de98712e..10b1afc8 100644
--- a/src/imp/interrupt/mod.rs
+++ b/src/imp/interrupt/mod.rs
@@ -1,5 +1,7 @@
 // SPDX-License-Identifier: Apache-2.0 OR MIT
 
+#![cfg_attr(all(target_arch = "sparc", test), allow(dead_code))]
+
 // Critical section based fallback implementations
 //
 // This module supports two different critical section implementations:
@@ -625,7 +627,9 @@ mod tests {
     test_atomic_int_single_thread!(u32);
     test_atomic_int_single_thread!(i64);
     test_atomic_int_single_thread!(u64);
+    #[cfg(not(target_arch = "sparc"))] // TODO: LLVM bug: SIGILL on 128-bit add
     test_atomic_int_single_thread!(i128);
+    #[cfg(not(target_arch = "sparc"))] // TODO: LLVM bug: SIGILL on 128-bit add
     test_atomic_int_single_thread!(u128);
     test_atomic_int_single_thread!(isize);
     test_atomic_int_single_thread!(usize);
diff --git a/src/tests/mod.rs b/src/tests/mod.rs
index ba7ed479..6ef87e69 100644
--- a/src/tests/mod.rs
+++ b/src/tests/mod.rs
@@ -31,7 +31,9 @@ test_atomic_int_pub!(i32);
 test_atomic_int_pub!(u32);
 test_atomic_int_pub!(i64);
 test_atomic_int_pub!(u64);
+#[cfg(not(target_arch = "sparc"))] // TODO: LLVM bug: SIGILL on 128-bit add
 test_atomic_int_pub!(i128);
+#[cfg(not(target_arch = "sparc"))] // TODO: LLVM bug: SIGILL on 128-bit add
 test_atomic_int_pub!(u128);
 
 #[cfg(feature = "float")]