Add OpenCL and CLBlast support

.github/workflows/build.yml

@@ -158,12 +158,34 @@ jobs:
            defines: '-DLLAMA_AVX2=OFF'
          - build: 'avx512'
            defines: '-DLLAMA_AVX512=ON -DBUILD_SHARED_LIBS=ON'
+         - build: 'opencl'
+           defines: '-DLLAMA_CLBLAST=ON -DCMAKE_PREFIX_PATH="$env:RUNNER_TEMP/clblast"'
 
     steps:
       - name: Clone
         id: checkout
         uses: actions/checkout@v1
 
+      - name: Download OpenCL SDK
+        id: get_opencl
+        if: ${{ matrix.build == 'opencl' }}
+        run: |
+          curl.exe -o $env:RUNNER_TEMP/opencl.zip -L https://github.com/KhronosGroup/OpenCL-SDK/releases/download/v2023.04.17/OpenCL-SDK-v2023.04.17-Win-x64.zip
+          mkdir $env:RUNNER_TEMP/opencl
+          tar.exe -xvf $env:RUNNER_TEMP/opencl.zip --strip-components=1 -C $env:RUNNER_TEMP/opencl
+
+      - name: Download CLBlast
+        id: get_clblast
+        if: ${{ matrix.build == 'opencl' }}
+        run: |
+          curl.exe -o $env:RUNNER_TEMP/clblast.zip -L https://github.com/CNugteren/CLBlast/releases/download/1.5.3/CLBlast-1.5.3-Windows-x64.zip
+          mkdir $env:RUNNER_TEMP/clblast
+          tar.exe -xvf $env:RUNNER_TEMP/clblast.zip -C $env:RUNNER_TEMP/clblast
+          foreach ($f in (gci -Recurse -Path "$env:RUNNER_TEMP/clblast" -Filter '*.cmake')) {
+            $txt = Get-Content -Path $f -Raw
+            $txt.Replace('C:/dependencies/opencl/', "$($env:RUNNER_TEMP.Replace('\','/'))/opencl/") | Set-Content -Path $f -Encoding UTF8
+          }
+
       - name: Build
         id: cmake_build
         run: |
@@ -172,6 +194,12 @@ jobs:
           cmake .. ${{ matrix.defines }}
           cmake --build . --config Release
 
+      - name: Add clblast.dll
+        id: add_clblast_dll
+        if: ${{ matrix.build == 'opencl' }}
+        run: |
+          cp $env:RUNNER_TEMP/clblast/lib/clblast.dll ./build/bin/Release
+
       - name: Check AVX512F support
         id: check_avx512f
         if: ${{ matrix.build == 'avx512' }}
@@ -187,7 +215,7 @@ jobs:
 
       - name: Test
         id: cmake_test
-        if: ${{ matrix.build != 'avx512' || env.HAS_AVX512F == '1' }} # Test AVX-512 only when possible
+        if: ${{  ( matrix.build != 'avx512' || env.HAS_AVX512F == '1' ) && matrix.build != 'opencl'  }} # Test AVX-512 only when possible
         run: |
           cd build
           ctest -C Release --verbose