Update

[ghstack-poisoned]

Author: GregoryComer

backends/xnnpack/CMakeLists.txt

@@ -59,7 +59,7 @@ foreach(fbs_file ${_xnnpack_schema__srcs})
   )
 endforeach()
 
-if(WIN32 AND NOT CMAKE_CROSSCOMPILING)
+if(${CMAKE_HOST_SYSTEM_NAME} STREQUAL "Windows")
   set(MV_COMMAND
       powershell -Command
       "Move-Item -Path ${_xnnpack_flatbuffer__outputs} -Destination ${_xnnpack_schema__outputs}"

tools/cmake/preset/windows.cmake

@@ -12,10 +12,15 @@ set_overridable_option(EXECUTORCH_BUILD_EXTENSION_FLAT_TENSOR ON)
 set_overridable_option(EXECUTORCH_BUILD_EXTENSION_MODULE ON)
 set_overridable_option(EXECUTORCH_BUILD_EXTENSION_RUNNER_UTIL ON)
 set_overridable_option(EXECUTORCH_BUILD_EXTENSION_TENSOR ON)
+set_overridable_option(EXECUTORCH_BUILD_XNNPACK ON)
+
+# These XNNPACK options don't currently build on Windows.
+set_overridable_option(XNNPACK_ENABLE_AVX256SKX OFF)
+set_overridable_option(XNNPACK_ENABLE_AVX256VNNI OFF)
+set_overridable_option(XNNPACK_ENABLE_AVX256VNNIGFNI OFF)
 
 # Below options are not yet buildable on Windows, but should be.
 set(EXECUTORCH_BUILD_PORTABLE_OPS OFF CACHE BOOL "")
 #set_overridable_option(EXECUTORCH_BUILD_EXECUTOR_RUNNER ON)
 #set_overridable_option(EXECUTORCH_BUILD_KERNELS_OPTIMIZED ON)
 #set_overridable_option(EXECUTORCH_BUILD_KERNELS_QUANTIZED ON)
-#set_overridable_option(EXECUTORCH_BUILD_XNNPACK ON)