build benchmarks and cbench in ci

.github/workflows/cmake.yml

@@ -40,31 +40,33 @@ jobs:
         curl  --url ${{ matrix.compiler_url }} --output download.sh
         sudo sh -x download.sh -s -a -s --action install --eula accept
     - name: Install gtest manually
-      run: sudo apt-get install libgtest-dev && cd /usr/src/gtest && sudo cmake CMakeLists.txt && sudo make && sudo cp lib/*.a /usr/lib && sudo ln -s /usr/lib/libgtest.a /usr/local/lib/libgtest.a && sudo ln -s /usr/lib/libgtest_main.a /usr/local/lib/libgtest_main.a
+      run: |
+        sudo apt-get install libgtest-dev && cd /usr/src/gtest && sudo cmake CMakeLists.txt && sudo make && sudo cp lib/*.a /usr/lib && sudo ln -s /usr/lib/libgtest.a /usr/local/lib/libgtest.a && sudo ln -s /usr/lib/libgtest_main.a /usr/local/lib/libgtest_main.a
+        sudo apt install libbenchmark1 libbenchmark-dev
 
     - name: Create Build Environment
       run: cmake -E make_directory ${{github.workspace}}/mdspan-build
-      
+
     - name: Check Out
       uses: actions/checkout@v2
       with:
         path: ${{github.workspace}}/mdspan-src
-      
+
     - name: Configure CMake
       shell: bash
       working-directory: ${{github.workspace}}/mdspan-build
-      run: CXX=${{ matrix.compiler_prefix}}/${{ matrix.compiler_driver }} cmake $GITHUB_WORKSPACE/mdspan-src -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/mdspan-install -DMDSPAN_ENABLE_TESTS=ON -DMDSPAN_ENABLE_EXAMPLES=ON -DCMAKE_CXX_FLAGS=${{matrix.cxx_flags_extra}}
-      
+      run: CXX=${{ matrix.compiler_prefix}}/${{ matrix.compiler_driver }} cmake $GITHUB_WORKSPACE/mdspan-src -DMDSPAN_CXX_STANDARD=17 -DCMAKE_BUILD_TYPE=$BUILD_TYPE -DCMAKE_INSTALL_PREFIX=$GITHUB_WORKSPACE/mdspan-install -DMDSPAN_ENABLE_TESTS=ON -DMDSPAN_ENABLE_EXAMPLES=ON -DMDSPAN_ENABLE_BENCHMARKS=ON -DMDSPAN_ENABLE_COMP_BENCH=ON -DCMAKE_CXX_FLAGS=${{matrix.cxx_flags_extra}}
+
     - name: Build
       shell: bash
       working-directory: ${{github.workspace}}/mdspan-build
       run: make -j
-      
+
     - name: Test
       working-directory: ${{github.workspace}}/mdspan-build
       shell: bash
-      run: ctest
-            
+      run: ctest --output-on-failure
+
     - name: Install
       shell: bash
       working-directory: ${{github.workspace}}/mdspan-build

benchmarks/CMakeLists.txt

@@ -5,6 +5,8 @@ function(mdspan_add_benchmark EXENAME)
   target_include_directories(${EXENAME} PUBLIC
       $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/benchmarks>
   )
+  # Set flag to build with parenthesis enabled
+  target_compile_definitions(${EXENAME} PRIVATE MDSPAN_USE_PAREN_OPERATOR=1)
 endfunction()
 
 find_package(benchmark REQUIRED)
@@ -42,6 +44,7 @@ function(mdspan_add_cuda_benchmark EXENAME)
   string(REPLACE "-pthread" "" _benchmark_libs "${_benchmark_libs_old}")
   target_include_directories(${EXENAME} PUBLIC "${_benchmark_include}")
   target_link_libraries(${EXENAME} PUBLIC "${_benchmark_libs};${_benchmark_libs_imported}")
+  target_compile_definitions(${EXENAME} PRIVATE MDSPAN_USE_PAREN_OPERATOR=1)
   if(_benchmark_libs_old MATCHES "-pthread")
     target_compile_options(${EXENAME} PUBLIC "-Xcompiler=-pthread")
   endif()
@@ -59,6 +62,7 @@ function(mdspan_add_openmp_benchmark EXENAME)
       target_include_directories(${EXENAME} PUBLIC
         $<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}/benchmarks>
       )
+      target_compile_definitions(${EXENAME} PRIVATE MDSPAN_USE_PAREN_OPERATOR=1)
     else()
       message(WARNING "Not adding target ${EXENAME} because OpenMP was not found")
     endif()

comp_bench/CMakeLists.txt

@@ -1,17 +1,33 @@
 
 include(metabench)
 
+# C++ standards that our benchmark will actually support
+set(_cbench_supported_standards 17 20 23)
+
+# Obtain the subset that are actually supported by the compiler
+set(_cbench_standards "")
+foreach(_std IN LISTS _cbench_supported_standards)
+  if ("cxx_std_${_std}" IN_LIST CMAKE_CXX_COMPILE_FEATURES)
+    list(APPEND _cbench_standards "${_std}")
+  endif()
+endforeach()
+
+message(STATUS "Using the following C++ standards for compiler benchmarking: ${_cbench_standards}")
+
 function(add_cxx_comparison name template range)
 
     set(all_datasets)
-    foreach(std IN ITEMS 11 14 17)
+    foreach(std IN LISTS _cbench_standards)
       metabench_add_dataset(
           ${name}_${std}
           ${template}
           ${range}
           MEDIAN_OF 3
       )
       target_link_libraries(${name}_${std} mdspan)
+      # Set parenthesis operator regardless of which standard we are using
+      # so we don't have to ifdef
+      target_compile_definitions(${name}_${std} PRIVATE MDSPAN_USE_PAREN_OPERATOR=1)
       set_property(TARGET ${name}_${std} PROPERTY CXX_STANDARD ${std})
       set(all_datasets ${all_datasets} ${name}_${std})
     endforeach()

comp_bench/cbench_submdspan.cpp.erb

@@ -4,13 +4,13 @@
 int test(int* data) {
   #if defined(METABENCH)
   auto sub0 = Kokkos::mdspan<int,
-    Kokkos::extents<
+    Kokkos::extents<size_t,
       <%= (["2"] * n).join(", ") %>
     >
   >(data);
   <% (32/n).times do |k| %>
   auto <%= "sub0_#{k}" %> = Kokkos::mdspan<int,
-    Kokkos::extents<
+    Kokkos::extents<size_t,
       <%= (["#{k+2}"] * n).join(", ") %>
     >
   >(data);