Add native CI for Aarch64

.github/workflows/ci.yml

@@ -17,14 +17,17 @@ env:
 
 jobs:
   build:
-    runs-on: ubuntu-24.04
+    runs-on: ${{ matrix.os.image }}
 
     strategy:
       fail-fast: false
       matrix:
+        os:
+          - { image: ubuntu-24.04, asset_name_suffix: "" }
+          - { image: ubuntu-24.04-arm, asset_name_suffix: "-aarch64" }
         libgccjit_version:
-          - { gcc: "gcc-15.deb" }
-          - { gcc: "gcc-15-without-int128.deb" }
+          - { gcc: "gcc-15" }
+          - { gcc: "gcc-15-without-int128" }
         commands: [
           "--std-tests",
           # FIXME: re-enable asm tests when GCC can emit in the right syntax.
@@ -56,17 +59,18 @@ jobs:
       run: rustup component add rustfmt clippy
 
     - name: Download artifact
-      run: curl -LO https://github.com/rust-lang/gcc/releases/latest/download/${{ matrix.libgccjit_version.gcc }}
+      run: curl -LO https://github.com/rust-lang/gcc/releases/latest/download/${{ matrix.libgccjit_version.gcc }}${{ matrix.os.asset_name_suffix }}.deb
 
     - name: Setup path to libgccjit
       run: |
-          sudo dpkg --force-overwrite -i ${{ matrix.libgccjit_version.gcc }}
+          sudo dpkg --force-overwrite -i ${{ matrix.libgccjit_version.gcc }}${{ matrix.os.asset_name_suffix }}.deb
           echo 'gcc-path = "/usr/lib/"' > config.toml
 
     # Some run-make tests fail if we use our forked GCC because it doesn't
     # bundle libstdc++, so we switch to gcc-14 to have a GCC that has
     # libstdc++.
     - name: Set default GCC to gcc-14
+      if: ${{ matrix.os.image == 'ubuntu-24.04' }} # TODO: check why this breaks the CI on Aarch64.
       run: sudo update-alternatives --install /usr/bin/cc cc /usr/bin/gcc-14 30
 
     - name: Set env

libgccjit.version

@@ -1 +1 @@
-28b84db392ac0a572f1a2a2a1317aa5f2bc742cb
+2a958ef3631207f0f02872ad7b950101b774f9b9

src/intrinsic/llvm.rs

@@ -1567,6 +1567,8 @@ pub fn intrinsic<'gcc, 'tcx>(name: &str, cx: &CodegenCx<'gcc, 'tcx>) -> Function
         "llvm.x86.avx512.uitofp.round.v8f32.v8i64" => "__builtin_ia32_cvtuqq2ps512_mask",
         "llvm.x86.avx512.uitofp.round.v4f32.v4i64" => "__builtin_ia32_cvtuqq2ps256_mask",
 
+        "llvm.aarch64.neon.umaxp.v16i8" => "__builtin_aarch64_umaxpv16qi",
+
         // TODO: support the tile builtins:
         "llvm.x86.ldtilecfg" => "__builtin_trap",
         "llvm.x86.sttilecfg" => "__builtin_trap",

src/lib.rs

@@ -479,10 +479,6 @@ fn to_gcc_opt_level(optlevel: Option<OptLevel>) -> OptimizationLevel {
 /// Returns the features that should be set in `cfg(target_feature)`.
 fn target_config(sess: &Session, target_info: &LockedTargetInfo) -> TargetConfig {
     let (unstable_target_features, target_features) = cfg_target_feature(sess, |feature| {
-        // TODO: we disable Neon for now since we don't support the LLVM intrinsics for it.
-        if feature == "neon" {
-            return false;
-        }
         target_info.cpu_supports(feature)
         // cSpell:disable
         /*