Add NEON support for ARMv7

.cargo/config.toml

@@ -1,3 +1,6 @@
+[target.thumbv7neon-unknown-linux-gnueabihf]
+linker = "arm-linux-gnueabihf-gcc"
+
 [target.wasm32-wasip1]
 runner = "wasmtime --dir=. --dir=.. --env ARBTEST_BUDGET_MS"
 rustflags = ["-C", "target-feature=+simd128,+relaxed-simd"]

.github/workflows/pull_request.yml

@@ -67,6 +67,14 @@ jobs:
       matrix:
         features: [all, none]
         os: [ubuntu-24.04-arm, ubuntu-latest]
+        include:
+          - os: ubuntu-24.04-arm
+            nightly: true
+            features: neon
+            target: thumbv7neon-unknown-linux-gnueabihf
+          - os: ubuntu-latest
+            features: simd128
+            target: wasm32-wasip1
     steps:
       - name: Checkout
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5 # v4
@@ -78,6 +86,7 @@ jobs:
         uses: dtolnay/rust-toolchain@29eef336d9b2848a0b548edc03f92a220660cdb8 # stable
         with:
           components: clippy
+          targets: ${{ matrix.target }}
 
       - name: Rust cache
         uses: Swatinem/rust-cache@98c8021b550208e191a6a3145459bfc9fb29c4c0 # v2.8.0
@@ -87,11 +96,17 @@ jobs:
 
       - name: Clippy with all features
         if: ${{ matrix.features == 'all' }}
-        run: cargo clippy --release --all-targets --all-features --tests --all -- -D warnings
+        run: cargo clippy --release --all-targets --all-features --all -- -D warnings
 
       - name: Clippy with no features
         if: ${{ matrix.features == 'none' }}
-        run: cargo clippy --release --all-targets --no-default-features --tests --all -- -D warnings
+        run: cargo clippy --release --all-targets --no-default-features --all -- -D warnings
+
+      - name: Clippy with ${{ matrix.features }} features
+        if: ${{ matrix.target }}
+        env:
+          RUSTC_BOOTSTRAP: ${{ matrix.nightly && 1 || 0 }}
+        run: cargo clippy --release -p jxl_simd --no-default-features --features ${{ matrix.features }} ${{ matrix.nightly && '--features nightly' }} --target ${{ matrix.target }} -- -D warnings
 
   test:
     runs-on: ${{ matrix.os || 'ubuntu-latest' }}
@@ -109,6 +124,9 @@ jobs:
             simd: avx512
           - os: ubuntu-24.04-arm
             simd: neon
+          - os: ubuntu-24.04-arm
+            simd: nightly-neon
+            target: thumbv7neon-unknown-linux-gnueabihf
           - os: ubuntu-latest
             simd: simd128
             target: wasm32-wasip1
@@ -129,6 +147,12 @@ jobs:
         with:
           targets: ${{ matrix.target }}
 
+      - name: Install ARMv7 toolchain
+        if: ${{ matrix.simd == 'nightly-neon' }}
+        run: |
+          sudo dpkg --add-architecture armhf
+          sudo apt install --update -y gcc-arm-linux-gnueabihf libc6-dev:armhf
+
       - name: Install wasmtime
         if: ${{ matrix.target == 'wasm32-wasip1' }}
         uses: bytecodealliance/actions/wasmtime/setup@v1
@@ -142,14 +166,23 @@ jobs:
         if: ${{ matrix.simd != 'none' && !matrix.target }}
         run: cargo test --release --all --no-fail-fast --no-default-features --features ${{ matrix.simd }}
 
+      - name: Tests with SIMD feature ${{ matrix.simd }} (ARMv7)
+        if: ${{ matrix.simd == 'nightly-neon' }}
+        env:
+          RUSTC_BOOTSTRAP: 1
+        run: |
+          cargo test --release --workspace --no-fail-fast --no-default-features --features nightly,neon --target ${{ matrix.target }} -- \
+            --skip compare_incremental_tirr_photo \
+            --skip compare_pipelines_progressive \
+            --skip compare_pipelines_tirr_photo
+
       - name: Tests with SIMD feature ${{ matrix.simd }} (wasm ${{ matrix.wasm_features }})
         if: ${{ matrix.target == 'wasm32-wasip1' }}
         env:
           RUSTFLAGS: -C target-feature=${{ matrix.wasm_features }}
         run: |
           cargo test --release --workspace --exclude jxl_cli --exclude jxl_cms --no-fail-fast --no-default-features --features ${{ matrix.simd }} --target ${{ matrix.target }} -- \
             --skip tirr_photo \
-            --skip huge_image \
             --skip fuzzer_smallbuffer
 
       - name: Tests with no features

AUTHORS

@@ -19,6 +19,7 @@ Google LLC <*@google.com>
 Caio <c410.f3r@gmail.com>
 Galaxy4594 <164440799+Galaxy4594@users.noreply.github.com>
 Ewout ter Hoeven <E.M.terHoeven@student.tudelft.nl>
+Foolbar <118464521+FooIbar@users.noreply.github.com>
 Helmut Januschka <helmut@januschka.com>
 Inflation <2375962+inflation@users.noreply.github.com>
 Jacob Abel <jacobabel@nullpo.dev>

jxl/Cargo.toml

@@ -40,6 +40,7 @@ avx = ["jxl_simd/avx"]
 avx512 = ["jxl_simd/avx512"]
 neon = ["jxl_simd/neon"]
 simd128 = ["jxl_simd/simd128"]
+nightly = ["jxl_simd/nightly", "jxl_transforms/nightly"]
 
 [lints]
 workspace = true

jxl/src/image/test.rs

@@ -31,6 +31,10 @@ impl<T: ImageDataType> Image<T> {
     }
 }
 
+#[cfg_attr(
+    target_pointer_width = "32",
+    ignore = "will overflow on 32-bit targets"
+)]
 #[test]
 fn huge_image() {
     assert!(Image::<u8>::new((1 << 28, 1 << 28)).is_err());

jxl/src/lib.rs

@@ -4,6 +4,11 @@
 // license that can be found in the LICENSE file.
 
 #![deny(unsafe_code)]
+#![cfg_attr(
+    all(target_arch = "arm", target_feature = "v7", feature = "nightly"),
+    feature(arm_target_feature)
+)]
+
 pub mod api;
 pub mod bit_reader;
 pub mod color;

jxl_cli/Cargo.toml

@@ -37,6 +37,7 @@ avx = ["jxl/avx"]
 avx512 = ["jxl/avx512"]
 neon = ["jxl/neon"]
 simd128 = ["jxl/simd128"]
+nightly = ["jxl/nightly"]
 
 [lints]
 workspace = true

jxl_simd/Cargo.toml

@@ -23,6 +23,7 @@ avx = ["sse42"]
 avx512 = ["avx"]
 neon = []
 simd128 = []
+nightly = []
 
 [lints]
 workspace = true

jxl_simd/src/aarch64/mod.rs → jxl_simd/src/arm/mod.rs

@@ -42,6 +42,7 @@ macro_rules! simd_function_body_neon {
             return $name(d, $($val),*);
         } else if let Some(d) = $crate::NeonDescriptor::new() {
             #[target_feature(enable = "neon")]
+			#[cfg_attr(target_arch = "arm", target_feature(enable = "v7"))]
             fn neon(d: $crate::NeonDescriptor, $($arg: $ty),*) $(-> $ret)? {
                 $name(d, $($val),*)
             }
@@ -87,6 +88,7 @@ macro_rules! test_neon {
                 use $crate::SimdDescriptor;
                 let Some(d) = $crate::NeonDescriptor::new() else { return; };
                 #[target_feature(enable = "neon")]
+                #[cfg_attr(target_arch = "arm", target_feature(enable = "v7"))]
                 fn inner(d: $crate::NeonDescriptor) {
                     $name(d)
                 }