diff --git a/.github/actions/build-opencl-clang/action.yml b/.github/actions/build-opencl-clang/action.yml
new file mode 100644
index 00000000..43bb970e
--- /dev/null
+++ b/.github/actions/build-opencl-clang/action.yml
@@ -0,0 +1,68 @@
+# ===---
+# Main opencl-clang building script
+# ===---
+
+name: Build opencl-clang
+inputs:
+  ref_llvm:
+    description: 'LLVM ref to build with'
+    required: true
+  ref_translator:
+    description: 'SPIRV-LLVM-Translator ref to build with'
+    required: true
+  ref_opencl-clang:
+    description: 'opencl-clang ref to build with'
+    required: true
+  build_type:
+    description: 'Build type to pass to CMake'
+    required: false
+    default: Release
+
+runs:
+  using: 'composite'
+  steps:
+
+    # Setup git credentials to make applying patches possible
+    - run: |
+        git config --global user.email "action@intel.com"
+        git config --global user.name "Action Bot"
+      shell: bash
+
+    - name: Checkout LLVM
+      uses: actions/checkout@v3
+      with:
+        repository: llvm/llvm-project
+        path: llvm-project
+        ref: ${{ inputs.ref_llvm }}
+
+    - name: Checkout SPIRV-LLVM-Translator
+      uses: actions/checkout@v3
+      with:
+        repository: KhronosGroup/SPIRV-LLVM-Translator
+        path: llvm-project/SPIRV-LLVM-Translator
+        ref: ${{ inputs.ref_translator }}
+        
+    - name: Checkout opencl-clang
+      uses: actions/checkout@v3
+      with:
+        path: llvm-project/opencl-clang
+        ref: ${{ inputs.ref_opencl-clang }}
+        
+    - name: Configure
+      shell: bash
+      run: |
+        mkdir build && cd build
+        cmake ${{ github.workspace }}/llvm-project/llvm      \
+          -DLLVM_ENABLE_PROJECTS="clang"                     \
+          -DLLVM_EXTERNAL_PROJECTS="llvm-spirv;opencl-clang" \
+          -DLLVM_EXTERNAL_LLVM_SPIRV_SOURCE_DIR=${{ github.workspace }}/llvm-project/SPIRV-LLVM-Translator \
+          -DLLVM_EXTERNAL_OPENCL_CLANG_SOURCE_DIR=${{ github.workspace }}/llvm-project/opencl-clang        \
+          -DCMAKE_BUILD_TYPE=${{ inputs.build_type }}  \
+          -DLLVM_TARGETS_TO_BUILD="X86" \
+          -G "Unix Makefiles"
+
+    - name: Build
+      shell: bash
+      run: |
+        cd build
+        make opencl-clang -j8
diff --git a/.github/workflows/check-in-tree-build.yml b/.github/workflows/check-in-tree-build.yml
deleted file mode 100644
index 029e6364..00000000
--- a/.github/workflows/check-in-tree-build.yml
+++ /dev/null
@@ -1,72 +0,0 @@
-name: In-tree build
-
-on:
-  push:
-    branches:
-      - 'ocl-open-*'
-    paths-ignore: # no need to check build for:
-      - 'docs/**' # documentation
-      - '**.md'   # README
-  pull_request:
-    branches:
-      - 'ocl-open-*'
-    paths-ignore: # no need to check build for:
-      - 'docs/**' # documentation
-      - '**.md'   # README
-  schedule:
-    # Weekly build on Mondays
-    # Ideally, we might want to simplify our regular nightly build as we
-    # probably don't need every configuration to be built every day: most of
-    # them are only necessary in pre-commits to avoid breakages
-    - cron: 0 0 * * 0
-
-env:
-  LLVM_VERSION: 11
-
-jobs:
-  build_and_test_linux:
-    name: Linux
-    strategy:
-      matrix:
-        build_type: [Release]
-        include:
-          - build_type: Release
-      fail-fast: false
-    runs-on: ubuntu-18.04
-    steps:
-      - name: setup git config
-        run: |
-          git config --global user.email "<>"
-          git config --global user.name "GitHub Actions Bot"
-      - name: Checkout LLVM sources
-        uses: actions/checkout@v2
-        with:
-          repository: llvm/llvm-project
-          ref: release/11.x
-          path: llvm-project
-      - name:  Checkout the translator sources
-        uses: actions/checkout@v2
-        with:
-          repository: KhronosGroup/SPIRV-LLVM-Translator
-          ref: llvm_release_110
-          path: llvm-project/SPIRV-LLVM-Translator
-      - name:  Checkout opencl-clang sources
-        uses: actions/checkout@v2
-        with:
-          path: llvm-project/opencl-clang
-      - name: Configure
-        run: |
-          mkdir build && cd build
-          cmake ${{ github.workspace }}/llvm-project/llvm \
-            -DLLVM_ENABLE_PROJECTS="clang" \
-            -DLLVM_EXTERNAL_PROJECTS="llvm-spirv;opencl-clang" \
-            -DLLVM_EXTERNAL_LLVM_SPIRV_SOURCE_DIR=${{ github.workspace }}/llvm-project/SPIRV-LLVM-Translator \
-            -DLLVM_EXTERNAL_OPENCL_CLANG_SOURCE_DIR=${{ github.workspace }}/llvm-project/opencl-clang \
-            -DCMAKE_BUILD_TYPE=${{ matrix.build_type }} \
-            -DLLVM_TARGETS_TO_BUILD="X86" \
-            -G "Unix Makefiles"
-      - name: Build
-        run: |
-          cd build
-          
-          make opencl-clang -j2
diff --git a/.github/workflows/on-push-verification.yml b/.github/workflows/on-push-verification.yml
new file mode 100644
index 00000000..ee0e04d8
--- /dev/null
+++ b/.github/workflows/on-push-verification.yml
@@ -0,0 +1,71 @@
+# ===---
+# Running on push & pull_request.
+#   This workflow parses the destination branch
+#   to choose correct dependencies revisions
+# ===---
+
+name: On push & pull-request verification
+run-name: '${{ github.event_name }}: ${{ github.base_ref }} ${{ github.ref_name }}' # github.base_ref null for 'on: push'
+
+on:
+  push:
+    branches:
+      - master
+      - ocl-open-*
+  pull_request:
+    branches:
+      - master
+      - ocl-open-*
+    types:
+      - opened
+      - reopened
+      - synchronize       # commit pushed to the PR
+      - ready_for_review  # moved from draft state
+
+jobs:
+
+  verify_default_branch:
+    name: Verify for `master` branch
+    # ref_name for 'on: push'
+    # base_ref for 'on: pull_request'
+    if: ${{ (github.event_name == 'push' && github.ref_name == 'master') || (github.event_name == 'pull_request' && github.base_ref == 'master') }}
+    runs-on: ubuntu-22.04
+    steps:
+
+      - name: Checkout opencl-clang sources for action files
+        uses: actions/checkout@v3
+
+      - name: Run build-opencl-clang action
+        uses: ./.github/actions/build-opencl-clang
+        with:
+          ref_llvm: main
+          ref_translator: main
+          ref_opencl-clang: ${{ github.ref }}
+
+  verify_release_branch:
+    name: Verify for `ocl-open-*` release branch
+    # ref_name for 'on: push'
+    # base_ref for 'on: pull_request'
+    if: ${{ github.ref_name != 'master' && github.base_ref != 'master' }}
+    runs-on: ubuntu-22.04
+    steps:
+
+      - name: Checkout opencl-clang sources for action files
+        uses: actions/checkout@v3
+
+      # This step will fail when the branch naming scheme 'ocl-open-XXX' changes!
+      - name: Parse LLVM version from branch name
+        id: check-llvm-version
+        run: |
+          BRANCH="${{ github.base_ref }}"          # on: pull_request, otherwise null
+          BRANCH=${BRANCH:-${{ github.ref_name }}} # on: push
+          LLVM_VERSION_LONG=$(echo $BRANCH | grep -oP '\d+') # Eg. 150 for LLVM 15
+          LLVM_VERSION_SHORT=${LLVM_VERSION_LONG::-1}        # Eg. 15  for LLVM 15
+          echo "llvm_version=$LLVM_VERSION_SHORT" >> $GITHUB_OUTPUT
+
+      - name: Run build-opencl-clang action
+        uses: ./.github/actions/build-opencl-clang
+        with:
+          ref_llvm: release/${{ steps.check-llvm-version.outputs.llvm_version }}.x
+          ref_translator: llvm_release_${{ steps.check-llvm-version.outputs.llvm_version }}0
+          ref_opencl-clang: ${{ github.ref }}