Move MacOS from Rosetta x64 to M1 Metal

Author: michel2323

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
       matrix:
         julia-version: ['lts', '1']
         julia-arch: [x64]
-        os: [ubuntu-latest,macos-latest,windows-latest]
+        os: [ubuntu-latest,windows-latest]
     steps:
       - uses: actions/checkout@v2
       - uses: julia-actions/setup-julia@latest
@@ -36,6 +36,36 @@ jobs:
         with:
           files: lcov.info
 
+  mac:
+    strategy:
+      matrix:
+        julia-version: ['lts', '1']
+        julia-arch: [aarch64]
+        os: [macos-latest]
+        backend: ['metal']
+    runs-on: ${{ matrix.os }}
+    steps:
+    - name: Checkout code
+      uses: actions/checkout@v2
+    - name: Setup Julia
+      uses: julia-actions/setup-julia@latest
+      with:
+        version: ${{ matrix.julia-version }}
+    - name: Setup tests
+      run: |
+        julia --color=yes --project=./test -e '
+          using Pkg
+          Pkg.Registry.update()
+          Pkg.develop(path=".")
+          Pkg.instantiate()'
+    - name: Add Metal.jl to test environment
+      if: matrix.backend == 'metal'
+      run: |
+        julia --project=test -e 'using Pkg; Pkg.add("Metal")'
+    - name: Run tests
+      run: |
+        julia --color=yes --project=./test -e 'include("test/runtests.jl")'
+
   gpu:
     strategy:
       matrix:

test/backends.jl

@@ -30,6 +30,15 @@ else
     @info "excluding oneAPI"
 end
 
+const EXAMODELS_TEST_METAL = is_package_installed("Metal")
+if EXAMODELS_TEST_METAL
+    @eval using Metal
+    @eval push!(BACKENDS, MetalBackend())
+    @info "including Metal"
+else
+    @info "excluding Metal"
+end
+
 const EXAMODELS_TEST_OPENCL = is_package_installed("OpenCL")
 if EXAMODELS_TEST_OPENCL
     @eval begin