From 3584827c77a34965f6d23dd4d7238133faf0fb45 Mon Sep 17 00:00:00 2001
From: Richard Townsend <ritownsend@google.com>
Date: Fri, 27 Feb 2026 10:02:00 -0800
Subject: [PATCH] [gn] Experimental CI for Windows

PiperOrigin-RevId: 876305109
---
 .github/workflows/build.yml | 77 +++++++++++++++++++++++++++++++++++++
 BUILD.gn                    |  9 +++--
 scripts/run-gn-tests.py     |  4 ++
 3 files changed, 87 insertions(+), 3 deletions(-)

diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d0d826c51fe..e86abee8242 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -244,6 +244,83 @@ jobs:
         run: ctest -C Release --output-on-failure --parallel $NUMBER_OF_PROCESSORS
         working-directory: ${{ github.workspace }}/build/windows/x86
 
+  gn-windows-x86_64:
+    runs-on: 'windows-2022-32core'
+    timeout-minutes: 30
+    env:
+      DEPOT_TOOLS_WIN_TOOLCHAIN: 0
+    steps:
+      - name: Install Depot Tools
+        uses: newkdev/setup-depot-tools@v1.0.1
+      - name: Write .gclient
+        shell: powershell
+        run: |
+          Set-Content -Path .gclient -Value "
+          solutions = [
+            { 'name': 'XNNPACK',
+              'url': 'https://github.com/google/XNNPACK',
+              'deps_file': 'DEPS',
+              'managed': False,
+              'custom_deps': {},
+            },
+          ]
+          "
+        working-directory: ${{ github.workspace }}
+      - name: Setup build environment
+        shell: bash
+        run: |
+          echo "VCVARSALL=$(vswhere -products \* -latest -property installationPath)\\VC\\Auxiliary\\Build\\vcvarsall.bat" >> $GITHUB_ENV
+      - name: Sync to commit and run hooks
+        shell: powershell
+        run: gclient sync -vv --revision $env:GITHUB_SHA
+      - name: Write LASTCHANGE files
+        shell: powershell
+        run: |
+          $LastChangeContents = @(
+            "LASTCHANGE=$env:GITHUB_SHA-$env:GITHUB_REF_NAME"
+            "LASTCHANGE_YEAR=$(git log -1 --pretty=%Y)"
+          )
+
+          Set-Content -Path build/util/LASTCHANGE -Value $LastChangeContents
+          $UnixTime = git log -1 --pretty=%ct
+          Set-Content -Path build/util/LASTCHANGE.committime -Value $UnixTime
+        working-directory: ${{ github.workspace }}\XNNPACK
+      - name: Generate build files (arm64, component)
+        run: |
+          gn gen --check --args="is_debug=true symbol_level=1 is_component_build=true target_cpu=\`"arm64\`"" out/arm64.dchecks
+        working-directory: ${{ github.workspace }}\XNNPACK
+        shell: powershell
+      - name: Generate build files (x64, dchecks)
+        run: |
+          gn gen --check --args="is_debug=false symbol_level=0 dcheck_always_on=true target_cpu=\`"x64\`"" out/x64.dchecks
+        working-directory: ${{ github.workspace }}\XNNPACK
+        shell: powershell
+      - name: Generate build files (x86, dchecks)
+        run: |
+          gn gen --check --args="is_debug=false symbol_level=0 dcheck_always_on=true target_cpu=\`"x86\`"" out/x86.dchecks
+        working-directory: ${{ github.workspace }}\XNNPACK
+        shell: powershell
+      - name: Build all targets (arm64, component)
+        run: |
+          autoninja -C out/arm64.dchecks
+        working-directory: ${{ github.workspace }}\XNNPACK
+      - name: Build all targets (x64 Release + debug checks)
+        run: |
+          autoninja -C out/x64.dchecks
+        working-directory: ${{ github.workspace }}\XNNPACK
+      - name: Build all targets (x86 Release + debug checks)
+        run: |
+          autoninja -C out/x86.dchecks
+        working-directory: ${{ github.workspace }}\XNNPACK
+      - name: Run tests (x64)
+        run: |
+          python3 scripts/run-gn-tests.py out/x64.dchecks
+        working-directory: ${{ github.workspace }}\XNNPACK
+      - name: Run tests (x86)
+        run: |
+          python3 scripts/run-gn-tests.py out/x86.dchecks
+        working-directory: ${{ github.workspace }}\XNNPACK
+
   cmake-macos-arm64:
     runs-on: macos-latest
     timeout-minutes: 60
diff --git a/BUILD.gn b/BUILD.gn
index 183ea27cb09..5af0cb0ccbe 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -93,8 +93,11 @@ declare_args() {
   # Enables AVX2 support for x86 processors
   xnnpack_enable_avx2 = target_cpu == "x64" || target_cpu == "x86"
 
-  # Enables AVX512 support for x86 processors
-  xnnpack_enable_avx512 = target_cpu == "x64" || target_cpu == "x86"
+  # Enables AVX512 support for x86 processors. Temporarily switched
+  # off on Windows because some AVX512 assembly kernels contain unsupported
+  # syntax.
+  xnnpack_enable_avx512 =
+      (target_cpu == "x64" || target_cpu == "x86") && !is_win
 
   # Enables VNNI extensions, which are separate from AVX512-VNNI
   xnnpack_enable_avx_vnni = target_cpu == "x64" || target_cpu == "x86"
@@ -771,7 +774,7 @@ xnnpack_source_set("xnnpack") {
     if (xnnpack_enable_avx512) {
       deps += [ ":avx512_microkernels" ]
     }
-    if (current_cpu == "x64") {
+    if (current_cpu == "x64" && !is_win) {
       sources += AMD64_ASM_MICROKERNEL_SRCS
     }
     sources += ALL_SSE_MICROKERNEL_SRCS
diff --git a/scripts/run-gn-tests.py b/scripts/run-gn-tests.py
index 04cf9250d7a..a73cfa79f11 100644
--- a/scripts/run-gn-tests.py
+++ b/scripts/run-gn-tests.py
@@ -15,6 +15,7 @@
 import datetime
 import glob
 import os
+import platform
 import sys
 
 # Add tests that require sharding here.
@@ -134,7 +135,10 @@ async def main() -> None:
   semaphore = asyncio.Semaphore(concurrency)
 
   # Pick up the executables - must be named in this way to work
+  # If we're on Windows, the executable will have a .exe extension.
   test_suites = list(sorted(glob.glob(args.out_dir + '/xnnpack_*_test')))
+  if platform.system() == "Windows":
+    test_suites = list(sorted(glob.glob(args.out_dir + '/xnnpack_*_test.exe')))
 
   print(f'Discovered {len(test_suites)} test suites...')
   # Create the list of tests to run, sharding the long ones.