[XNNPACK] support building xnnpack EP for IOS (#13461)

### Description
support building xnnpack for IOS


### Motivation and Context
<!-- - Why is this change required? What problem does it solve?
- If it fixes an open issue, please link to the issue here. -->

cmake/external/xnnpack.cmake

@@ -8,8 +8,13 @@ set(FP16_BUILD_BENCHMARKS OFF CACHE INTERNAL "")
 set(CLOG_SOURCE_DIR "${PYTORCH_CPUINFO_DIR}/deps/clog")
 set(CPUINFO_SOURCE_DIR ${PYTORCH_CPUINFO_DIR})
 
-if(onnxruntime_BUILD_WEBASSEMBLY)
-  execute_process(COMMAND git apply --ignore-space-change --ignore-whitespace ${PROJECT_SOURCE_DIR}/patches/xnnpack/AddEmscriptenSupport.patch WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/${XNNPACK_DIR})
+# BF16 instructions cause ICE in Android NDK compiler
+if(CMAKE_ANDROID_ARCH_ABI STREQUAL armeabi-v7a)
+  set(XNNPACK_ENABLE_ARM_BF16 OFF)
+ENDIF()
+
+if(onnxruntime_BUILD_WEBASSEMBLY OR CMAKE_SYSTEM_NAME STREQUAL "iOS")
+  execute_process(COMMAND git apply --ignore-space-change --ignore-whitespace ${PROJECT_SOURCE_DIR}/patches/xnnpack/AddEmscriptenAndIosSupport.patch WORKING_DIRECTORY ${PROJECT_SOURCE_DIR}/${XNNPACK_DIR})
 endif()
 
 add_subdirectory(external/FP16)

cmake/patches/xnnpack/AddEmscriptenAndIosSupport.patch

@@ -0,0 +1,24 @@
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index d53c48aa1..4c987bd7a 100755
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -105,7 +105,7 @@ ENDIF()
+ 
+ IF(NOT CMAKE_SYSTEM_NAME)
+   MESSAGE(FATAL_ERROR "CMAKE_SYSTEM_NAME not defined")
+-ELSEIF(NOT CMAKE_SYSTEM_NAME MATCHES "^(Darwin|Linux|Android|Windows|CYGWIN|MSYS)$")
++ELSEIF(NOT CMAKE_SYSTEM_NAME MATCHES "^(Darwin|Linux|Android|Windows|CYGWIN|MSYS|Emscripten|iOS)$")
+   MESSAGE(FATAL_ERROR "Unrecognized CMAKE_SYSTEM_NAME = ${CMAKE_SYSTEM_NAME}")
+ ENDIF()
+ 
+@@ -7108,6 +7108,10 @@ IF(MSVC)
+   SET_PROPERTY(SOURCE ${ALL_MICROKERNEL_SRCS} APPEND_STRING PROPERTY COMPILE_FLAGS "$<$<NOT:$<CONFIG:Debug>>: /O2 >")
+   SET_PROPERTY(SOURCE ${HOT_SRCS} APPEND_STRING PROPERTY COMPILE_FLAGS "$<$<NOT:$<CONFIG:Debug>>: /O2 >")
+   SET_PROPERTY(SOURCE ${COLD_SRCS} APPEND_STRING PROPERTY COMPILE_FLAGS "$<$<NOT:$<CONFIG:Debug>>: /O1 >")
++ELSEIF(CMAKE_GENERATOR STREQUAL Xcode)
++  TARGET_COMPILE_OPTIONS(all_microkernels PRIVATE $<$<NOT:$<CONFIG:Debug>>: -O2 >)
++  TARGET_COMPILE_OPTIONS(XNNPACK PRIVATE $<$<NOT:$<CONFIG:Debug>>: -O2 >)
++  TARGET_COMPILE_OPTIONS(XNNPACK PRIVATE $<$<NOT:$<CONFIG:Debug>>: -Os >)
+ ELSE()
+   SET_PROPERTY(SOURCE ${ALL_MICROKERNEL_SRCS} APPEND_STRING PROPERTY COMPILE_FLAGS "$<$<NOT:$<CONFIG:Debug>>: -O2 >")
+   SET_PROPERTY(SOURCE ${HOT_SRCS} APPEND_STRING PROPERTY COMPILE_FLAGS "$<$<NOT:$<CONFIG:Debug>>: -O2 >")

cmake/patches/xnnpack/AddEmscriptenSupport.patch

@@ -1,13 +0,0 @@
-diff --git a/CMakeLists.txt b/CMakeLists.txt
-index 937b17f51..af0d2300f 100755
---- a/CMakeLists.txt
-+++ b/CMakeLists.txt
-@@ -82,7 +82,7 @@ ENDIF()
- 
- IF(NOT CMAKE_SYSTEM_NAME)
-   MESSAGE(FATAL_ERROR "CMAKE_SYSTEM_NAME not defined")
--ELSEIF(NOT CMAKE_SYSTEM_NAME MATCHES "^(Darwin|Linux|Android|Windows|CYGWIN|MSYS)$")
-+ELSEIF(NOT CMAKE_SYSTEM_NAME MATCHES "^(Darwin|Linux|Android|Windows|CYGWIN|MSYS|Emscripten)$")
-   MESSAGE(FATAL_ERROR "Unrecognized CMAKE_SYSTEM_NAME = ${CMAKE_SYSTEM_NAME}")
- ENDIF()
- 

tools/ci_build/github/apple/default_full_ios_framework_build_settings.json

@@ -16,6 +16,7 @@
         "--use_coreml",
         "--skip_tests",
         "--cmake_extra_defines=onnxruntime_BUILD_UNIT_TESTS=OFF",
-        "--apple_deploy_target=11.0"
+        "--apple_deploy_target=11.0",
+        "--use_xnnpack"
     ]
 }

tools/ci_build/github/azure-pipelines/mac-ios-ci-pipeline.yml

@@ -1,3 +1,8 @@
+parameters:
+- name: BuildXnnpack
+  default: false
+  type: boolean
+
 jobs:
 - job: iOS_CI_CPU_on_Mac
   pool:
@@ -58,3 +63,34 @@ jobs:
           --path_to_protoc_exe $(Build.BinariesDirectory)/protobuf_install/bin/protoc \
           --parallel
       displayName: (CoreML EP) Build onnxruntime for iOS x86_64 and run tests using simulator
+
+- job: iOS_CI_XNNPACK_on_Mac
+  pool:
+    vmImage: 'macOS-11'
+  variables:
+    MACOSX_DEPLOYMENT_TARGET: '10.14'
+  timeoutInMinutes: 100
+  condition: or(eq('${{parameters.BuildXnnpack}}', 'true'), eq(variables['Build.SourceBranch'], 'refs/heads/main'))
+  steps:
+    - script: |
+        /bin/bash $(Build.SourcesDirectory)/tools/ci_build/github/apple/build_host_protoc.sh \
+          $(Build.SourcesDirectory) \
+          $(Build.BinariesDirectory)/protobuf \
+          $(Build.BinariesDirectory)/protobuf_install
+      displayName: Build Host Protoc
+
+    - script: |
+        python3 $(Build.SourcesDirectory)/tools/ci_build/build.py \
+          --skip_submodule_sync \
+          --build_dir $(Build.BinariesDirectory)/iOS_xnnpack \
+          --use_xnnpack \
+          --ios \
+          --ios_sysroot iphonesimulator  \
+          --osx_arch x86_64 \
+          --apple_deploy_target 11.0 \
+          --use_xcode \
+          --config RelWithDebInfo \
+          --build_apple_framework \
+          --path_to_protoc_exe $(Build.BinariesDirectory)/protobuf_install/bin/protoc \
+          --parallel
+      displayName: (XNNPACK EP) Build onnxruntime for iOS x86_64 and run tests using simulator