vectorization.yml

name: Check Vectorization by Compiler

on: [push, pull_request]

permissions:
  contents: read #  to fetch code (actions/checkout)

jobs:
  build:
    runs-on: ${{ matrix.config.os }}
    strategy:
      matrix:
        config:
          - {
              os: ubuntu-latest,
              compiler: gcc,
              flags: "-O3 -ftree-vectorize -fopt-info-vec-optimized",
            }
          - {
              os: macOS-latest,
              compiler: clang,
              flags: "-O3 -Rpass=loop-vectorize",
            }
          - { os: windows-latest, compiler: cl, flags: "/O2 /Qvec-report:2" }
        files:
          - ["src/util/sample.cpp", "src/util/sample.h"]
    steps:
      - name: "Check out repository"
        uses: actions/checkout@v4.1.6
        with:
          # This is necessary for making `git describe` work.
          fetch-depth: 0

      - name: "Ensure that all tags are fetched"
        # Works around an issue where not the latest tag is not fetched when the
        # workflow is triggered by a tag push event.
        # Possibly related: actions/checkout#290
        run: git fetch origin --force --tags

      - name: Set up compiler
        run: |
          if [ "${{ matrix.config.compiler }}" = "gcc" ]; then
            sudo apt-get install -y ${{ matrix.config.compiler }}
          fi

      - name: Compile and check vectorization
        id: check
        shell: bash
        run: |
          for FILE in "${{ matrix.files }}"; do
           if [[ "${{ runner.os }}" == "Windows" ]]; then
             OUTPUT=$(pwsh -c "& '${{ matrix.compiler }}' ${{matrix.flags}} '$FILE'")
             echo "result=$OUTPUT" >> $GITHUB_ENV
           else
             OUTPUT=$("${{ matrix.compiler }}" ${{matrix.flags}} "$FILE")
             echo "result=$OUTPUT" >> $GITHUB_ENV
           fi
          done

      - name: Print vectorization results
        id: evaluate
        shell: bash
        run: |
          if [[ "${{ runner.os }}" == "Windows" ]]; then
             echo "result=$OUTPUT" >> $GITHUB_ENV
          else
             echo "result=$OUTPUT" >> $GITHUB_ENV
          fi

      - name: Print result
        run: echo "${{ env.result }}"

  report:
    needs: build
    runs-on: ubuntu-latest
    steps:
      - name: Create report
        run: |
          echo "OS, Compiler, Function, Vectorized"
          echo "${{ needs.build.outputs.result }}"