diff --git a/.gitmodules b/.gitmodules
index ebc2c470238..c3d1e7b3ebb 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -10,3 +10,9 @@
 [submodule "third-party/gflags"]
 	path = third-party/gflags
 	url = https://github.com/gflags/gflags.git
+[submodule "backends/xnnpack/third-party/pthreadpool"]
+	path = backends/xnnpack/third-party/pthreadpool
+	url = https://github.com/Maratyszcza/pthreadpool.git
+[submodule "backends/xnnpack/third-party/cpuinfo"]
+	path = backends/xnnpack/third-party/cpuinfo
+	url = https://github.com/pytorch/cpuinfo.git
diff --git a/backends/xnnpack/third-party/TARGETS b/backends/xnnpack/third-party/TARGETS
new file mode 100644
index 00000000000..77cd696d253
--- /dev/null
+++ b/backends/xnnpack/third-party/TARGETS
@@ -0,0 +1,6 @@
+load(":pthreadpool_defs.bzl", "define_pthreadpool")
+load(":cpuinfo_defs.bzl", "define_cpuinfo_and_clog")
+
+define_pthreadpool()
+
+define_cpuinfo_and_clog()
diff --git a/backends/xnnpack/third-party/cpuinfo b/backends/xnnpack/third-party/cpuinfo
new file mode 160000
index 00000000000..6481e8bef08
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo
@@ -0,0 +1 @@
+Subproject commit 6481e8bef08f606ddd627e4d3be89f64d62e1b8a
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/api.c b/backends/xnnpack/third-party/cpuinfo-wrappers/api.c
new file mode 100644
index 00000000000..efd8e45ed94
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/api.c
@@ -0,0 +1,7 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#include <api.c>
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/android/properties.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/android/properties.c
new file mode 100644
index 00000000000..02dc2354432
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/android/properties.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__arm__) || defined(__aarch64__)) && defined(__ANDROID__)
+#include <arm/android/properties.c>
+#endif /* (defined(__arm__) || defined(__aarch64__)) && defined(__ANDROID__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/cache.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/cache.c
new file mode 100644
index 00000000000..1a7180d32bb
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/cache.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__arm__) || defined(__aarch64__)) && defined(__linux__)
+#include <arm/cache.c>
+#endif /* (defined(__arm__) || defined(__aarch64__)) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/aarch32-isa.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/aarch32-isa.c
new file mode 100644
index 00000000000..7b76cf544b0
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/aarch32-isa.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__arm__) && defined(__linux__)
+#include <arm/linux/aarch32-isa.c>
+#endif /* defined(__arm__) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/aarch64-isa.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/aarch64-isa.c
new file mode 100644
index 00000000000..6e88e68a3ae
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/aarch64-isa.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__aarch64__) && defined(__linux__)
+#include <arm/linux/aarch64-isa.c>
+#endif /* defined(__aarch64__) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/chipset.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/chipset.c
new file mode 100644
index 00000000000..32e5eeaacec
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/chipset.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__arm__) || defined(__aarch64__)) && defined(__linux__)
+#include <arm/linux/chipset.c>
+#endif /* (defined(__arm__) || defined(__aarch64__)) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/clusters.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/clusters.c
new file mode 100644
index 00000000000..9ddc9930a42
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/clusters.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__arm__) || defined(__aarch64__)) && defined(__linux__)
+#include <arm/linux/clusters.c>
+#endif /* (defined(__arm__) || defined(__aarch64__)) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/cpuinfo.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/cpuinfo.c
new file mode 100644
index 00000000000..f49c33970d5
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/cpuinfo.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__arm__) || defined(__aarch64__)) && defined(__linux__)
+#include <arm/linux/cpuinfo.c>
+#endif /* (defined(__arm__) || defined(__aarch64__)) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/hwcap.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/hwcap.c
new file mode 100644
index 00000000000..9b7b317323a
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/hwcap.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__arm__) || defined(__aarch64__)) && defined(__linux__)
+#include <arm/linux/hwcap.c>
+#endif /* (defined(__arm__) || defined(__aarch64__)) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/init.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/init.c
new file mode 100644
index 00000000000..c273f699e8f
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/init.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__arm__) || defined(__aarch64__)) && defined(__linux__)
+#include <arm/linux/init.c>
+#endif /* (defined(__arm__) || defined(__aarch64__)) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/midr.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/midr.c
new file mode 100644
index 00000000000..2fe2afd7159
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/linux/midr.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__arm__) || defined(__aarch64__)) && defined(__linux__)
+#include <arm/linux/midr.c>
+#endif /* (defined(__arm__) || defined(__aarch64__)) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/mach/init.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/mach/init.c
new file mode 100644
index 00000000000..47a71a6ba72
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/mach/init.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__arm__) || defined(__aarch64__)) && defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE
+#include <arm/mach/init.c>
+#endif /* (defined(__arm__) || defined(__aarch64__)) && defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/tlb.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/tlb.c
new file mode 100644
index 00000000000..b3c1f82f2aa
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/tlb.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__arm__) || defined(__aarch64__)) && defined(__linux__)
+#include <arm/tlb.c>
+#endif /* (defined(__arm__) || defined(__aarch64__)) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/arm/uarch.c b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/uarch.c
new file mode 100644
index 00000000000..cbabd52a9c8
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/arm/uarch.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__arm__) || defined(__aarch64__)) && defined(__linux__)
+#include <arm/uarch.c>
+#endif /* (defined(__arm__) || defined(__aarch64__)) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/cache.c b/backends/xnnpack/third-party/cpuinfo-wrappers/cache.c
new file mode 100644
index 00000000000..1711f6e3716
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/cache.c
@@ -0,0 +1,7 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#include <cache.c>
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/init.c b/backends/xnnpack/third-party/cpuinfo-wrappers/init.c
new file mode 100644
index 00000000000..9b01d09b6bb
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/init.c
@@ -0,0 +1,7 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#include <init.c>
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/linux/cpulist.c b/backends/xnnpack/third-party/cpuinfo-wrappers/linux/cpulist.c
new file mode 100644
index 00000000000..5366dfd8f17
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/linux/cpulist.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__linux__)
+#include <linux/cpulist.c>
+#endif /* defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/linux/mockfile.c b/backends/xnnpack/third-party/cpuinfo-wrappers/linux/mockfile.c
new file mode 100644
index 00000000000..a5506e98e20
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/linux/mockfile.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__linux__)
+#include <linux/mockfile.c>
+#endif /* defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/linux/multiline.c b/backends/xnnpack/third-party/cpuinfo-wrappers/linux/multiline.c
new file mode 100644
index 00000000000..773ad78da7a
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/linux/multiline.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__linux__)
+#include <linux/multiline.c>
+#endif /* defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/linux/processors.c b/backends/xnnpack/third-party/cpuinfo-wrappers/linux/processors.c
new file mode 100644
index 00000000000..3e49452e71c
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/linux/processors.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__linux__)
+#include <linux/processors.c>
+#endif /* defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/linux/smallfile.c b/backends/xnnpack/third-party/cpuinfo-wrappers/linux/smallfile.c
new file mode 100644
index 00000000000..b6b7fb0a180
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/linux/smallfile.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__linux__)
+#include <linux/smallfile.c>
+#endif /* defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/mach/topology.c b/backends/xnnpack/third-party/cpuinfo-wrappers/mach/topology.c
new file mode 100644
index 00000000000..285427e111b
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/mach/topology.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__MACH__) && defined(__APPLE__)
+#include <mach/topology.c>
+#endif /* defined(__MACH__) && defined(__APPLE__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/cache/descriptor.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/cache/descriptor.c
new file mode 100644
index 00000000000..662f4817150
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/cache/descriptor.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32)
+#include <x86/cache/descriptor.c>
+#endif /* defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/cache/deterministic.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/cache/deterministic.c
new file mode 100644
index 00000000000..1d16bc397d3
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/cache/deterministic.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32)
+#include <x86/cache/deterministic.c>
+#endif /* defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/cache/init.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/cache/init.c
new file mode 100644
index 00000000000..9fb27f2f285
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/cache/init.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32)
+#include <x86/cache/init.c>
+#endif /* defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/info.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/info.c
new file mode 100644
index 00000000000..6c49fb13f25
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/info.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32)
+#include <x86/info.c>
+#endif /* defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/init.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/init.c
new file mode 100644
index 00000000000..166725960f5
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/init.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32)
+#include <x86/init.c>
+#endif /* defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/isa.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/isa.c
new file mode 100644
index 00000000000..fb07179c1dd
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/isa.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32)
+#include <x86/isa.c>
+#endif /* defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/linux/cpuinfo.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/linux/cpuinfo.c
new file mode 100644
index 00000000000..651f8f5c7b8
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/linux/cpuinfo.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__i386__) || defined(__i686__) || defined(__x86_64__)) && defined(__linux__)
+#include <x86/linux/cpuinfo.c>
+#endif /* (defined(__i386__) || defined(__i686__) || defined(__x86_64__)) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/linux/init.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/linux/init.c
new file mode 100644
index 00000000000..5ac2cae0a4c
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/linux/init.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__i386__) || defined(__i686__) || defined(__x86_64__)) && defined(__linux__)
+#include <x86/linux/init.c>
+#endif /* (defined(__i386__) || defined(__i686__) || defined(__x86_64__)) && defined(__linux__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/mach/init.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/mach/init.c
new file mode 100644
index 00000000000..d0ff8379552
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/mach/init.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if (defined(__i386__) || defined(__i686__) || defined(__x86_64__)) && defined(__MACH__) && defined(__APPLE__)
+#include <x86/mach/init.c>
+#endif /* (defined(__i386__) || defined(__i686__) || defined(__x86_64__)) && defined(__MACH__) && defined(__APPLE__) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/mockcpuid.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/mockcpuid.c
new file mode 100644
index 00000000000..b5ffcc43f61
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/mockcpuid.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32)
+#include <x86/mockcpuid.c>
+#endif /* defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/name.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/name.c
new file mode 100644
index 00000000000..e9331cd9186
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/name.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32)
+#include <x86/name.c>
+#endif /* defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/topology.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/topology.c
new file mode 100644
index 00000000000..864aa8757da
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/topology.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32)
+#include <x86/topology.c>
+#endif /* defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/uarch.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/uarch.c
new file mode 100644
index 00000000000..ac51c0dff14
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/uarch.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32)
+#include <x86/uarch.c>
+#endif /* defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/vendor.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/vendor.c
new file mode 100644
index 00000000000..6d5e122e313
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/vendor.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32)
+#include <x86/vendor.c>
+#endif /* defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32) */
diff --git a/backends/xnnpack/third-party/cpuinfo-wrappers/x86/windows/init.c b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/windows/init.c
new file mode 100644
index 00000000000..8a8bc24dd46
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo-wrappers/x86/windows/init.c
@@ -0,0 +1,9 @@
+/* Auto-generated by generate-wrappers.py script. Do not modify */
+
+#ifdef __APPLE__
+	#include <TargetConditionals.h>
+#endif /* __APPLE__ */
+
+#if defined(_WIN32)
+#include <x86/windows/init.c>
+#endif /* defined(_WIN32) */
diff --git a/backends/xnnpack/third-party/cpuinfo_defs.bzl b/backends/xnnpack/third-party/cpuinfo_defs.bzl
new file mode 100644
index 00000000000..95ee3767885
--- /dev/null
+++ b/backends/xnnpack/third-party/cpuinfo_defs.bzl
@@ -0,0 +1,72 @@
+def define_cpuinfo_and_clog():
+    # @lint-ignore BUCKLINT: native and fb_native are explicitly forbidden in fbcode.
+    native.cxx_library(
+        name = "cpuinfo",
+        srcs = [
+            "cpuinfo-wrappers/api.c",
+            "cpuinfo-wrappers/arm/android/properties.c",
+            "cpuinfo-wrappers/arm/cache.c",
+            "cpuinfo-wrappers/arm/linux/aarch32-isa.c",
+            "cpuinfo-wrappers/arm/linux/aarch64-isa.c",
+            "cpuinfo-wrappers/arm/linux/chipset.c",
+            "cpuinfo-wrappers/arm/linux/clusters.c",
+            "cpuinfo-wrappers/arm/linux/cpuinfo.c",
+            "cpuinfo-wrappers/arm/linux/hwcap.c",
+            "cpuinfo-wrappers/arm/linux/init.c",
+            "cpuinfo-wrappers/arm/linux/midr.c",
+            "cpuinfo-wrappers/arm/mach/init.c",
+            "cpuinfo-wrappers/arm/uarch.c",
+            "cpuinfo-wrappers/cache.c",
+            "cpuinfo-wrappers/init.c",
+            "cpuinfo-wrappers/linux/cpulist.c",
+            "cpuinfo-wrappers/linux/multiline.c",
+            "cpuinfo-wrappers/linux/processors.c",
+            "cpuinfo-wrappers/linux/smallfile.c",
+            "cpuinfo-wrappers/mach/topology.c",
+            "cpuinfo-wrappers/x86/cache/descriptor.c",
+            "cpuinfo-wrappers/x86/cache/deterministic.c",
+            "cpuinfo-wrappers/x86/cache/init.c",
+            "cpuinfo-wrappers/x86/info.c",
+            "cpuinfo-wrappers/x86/init.c",
+            "cpuinfo-wrappers/x86/isa.c",
+            "cpuinfo-wrappers/x86/linux/cpuinfo.c",
+            "cpuinfo-wrappers/x86/linux/init.c",
+            "cpuinfo-wrappers/x86/mach/init.c",
+            "cpuinfo-wrappers/x86/name.c",
+            "cpuinfo-wrappers/x86/topology.c",
+            "cpuinfo-wrappers/x86/uarch.c",
+            "cpuinfo-wrappers/x86/vendor.c",
+            "cpuinfo-wrappers/x86/windows/init.c",
+        ],
+        include_directories = ["cpuinfo/src"],
+        public_include_directories = ["cpuinfo/include"],
+        raw_headers = native.glob([
+            "cpuinfo/src/**/*.h",
+            "cpuinfo/src/**/*.c",
+        ]),
+        preferred_linkage = "static",
+        preprocessor_flags = [
+            "-DCPUINFO_LOG_LEVEL=2",
+            "-D_GNU_SOURCE=1",
+        ],
+        visibility = ["PUBLIC"],
+        deps = [
+            ":clog",
+        ],
+    )
+
+    # @lint-ignore BUCKLINT: native and fb_native are explicitly forbidden in fbcode.
+    native.cxx_library(
+        name = "clog",
+        srcs = [
+            "cpuinfo/deps/clog/src/clog.c",
+        ],
+        raw_headers = native.glob([
+            "cpuinfo/deps/clog/include/*.h",
+        ]),
+        public_include_directories = [
+            "cpuinfo/deps/clog/include/",
+        ],
+        force_static = True,
+        visibility = ["PUBLIC"],
+    )
diff --git a/backends/xnnpack/third-party/generate-cpuinfo-wrappers.py b/backends/xnnpack/third-party/generate-cpuinfo-wrappers.py
new file mode 100644
index 00000000000..4d5f2a1dce4
--- /dev/null
+++ b/backends/xnnpack/third-party/generate-cpuinfo-wrappers.py
@@ -0,0 +1,92 @@
+#!/usr/bin/env python3
+
+from __future__ import print_function
+import os
+
+
+CPUINFO_SOURCES = {
+    None: [
+        "init.c",
+        "api.c",
+        "cache.c",
+    ],
+    "defined(__linux__)": [
+        "linux/multiline.c",
+        "linux/cpulist.c",
+        "linux/mockfile.c",
+        "linux/smallfile.c",
+        "linux/processors.c",
+    ],
+    "defined(__MACH__) && defined(__APPLE__)": [
+        "mach/topology.c",
+    ],
+    "defined(__i386__) || defined(__i686__) || defined(__x86_64__) || defined(_WIN32)": [
+        "x86/cache/init.c",
+        "x86/cache/deterministic.c",
+        "x86/cache/descriptor.c",
+        "x86/info.c",
+        "x86/mockcpuid.c",
+        "x86/isa.c",
+        "x86/topology.c",
+        "x86/name.c",
+        "x86/init.c",
+        "x86/uarch.c",
+        "x86/vendor.c",
+    ],
+    "(defined(__i386__) || defined(__i686__) || defined(__x86_64__)) && defined(__linux__)": [
+        "x86/linux/init.c",
+        "x86/linux/cpuinfo.c",
+    ],
+    "(defined(__i386__) || defined(__i686__) || defined(__x86_64__)) && defined(__MACH__) && defined(__APPLE__)": [
+        "x86/mach/init.c",
+    ],
+    "defined(_WIN32)": [
+        "x86/windows/init.c",
+    ],
+    "(defined(__arm__) || defined(__aarch64__)) && defined(__linux__)": [
+        "arm/linux/cpuinfo.c",
+        "arm/linux/hwcap.c",
+        "arm/linux/init.c",
+        "arm/linux/clusters.c",
+        "arm/linux/midr.c",
+        "arm/linux/chipset.c",
+        "arm/tlb.c",
+        "arm/uarch.c",
+        "arm/cache.c",
+    ],
+    "defined(__arm__) && defined(__linux__)": [
+        "arm/linux/aarch32-isa.c",
+    ],
+    "defined(__aarch64__) && defined(__linux__)": [
+        "arm/linux/aarch64-isa.c",
+    ],
+    "(defined(__arm__) || defined(__aarch64__)) && defined(__ANDROID__)": [
+        "arm/android/properties.c",
+    ],
+    "(defined(__arm__) || defined(__aarch64__)) && defined(TARGET_OS_IPHONE) && TARGET_OS_IPHONE": [
+        "arm/mach/init.c",
+    ],}
+
+
+if __name__ == "__main__":
+    for condition, filenames in CPUINFO_SOURCES.items():
+        for filename in filenames:
+            filepath = os.path.join("cpuinfo-wrappers", filename)
+            if not os.path.exists(os.path.dirname(filepath)):
+                print(filepath)
+                os.makedirs(os.path.dirname(filepath))
+            with open(filepath, "w") as wrapper:
+                print("/* Auto-generated by generate-wrappers.py script. Do not modify */", file=wrapper)
+                print(file=wrapper)
+                print("#ifdef __APPLE__", file=wrapper)
+                print("\t#include <TargetConditionals.h>", file=wrapper)
+                print("#endif /* __APPLE__ */", file=wrapper)
+                print(file=wrapper)
+
+                if not condition:
+                    print("#include <%s>" % filename, file=wrapper)
+                else:
+                    # Include source file only if condition is satisfied
+                    print("#if %s" % condition, file=wrapper)
+                    print("#include <%s>" % filename, file=wrapper)
+                    print("#endif /* %s */" % condition, file=wrapper)
diff --git a/backends/xnnpack/third-party/pthreadpool b/backends/xnnpack/third-party/pthreadpool
new file mode 160000
index 00000000000..a134dd5d4ce
--- /dev/null
+++ b/backends/xnnpack/third-party/pthreadpool
@@ -0,0 +1 @@
+Subproject commit a134dd5d4cee80cce15db81a72e7f929d71dd413
diff --git a/backends/xnnpack/third-party/pthreadpool_defs.bzl b/backends/xnnpack/third-party/pthreadpool_defs.bzl
new file mode 100644
index 00000000000..353754f47e4
--- /dev/null
+++ b/backends/xnnpack/third-party/pthreadpool_defs.bzl
@@ -0,0 +1,39 @@
+def define_pthreadpool():
+    # @lint-ignore BUCKLINT: native and fb_native are explicitly forbidden in fbcode.
+    native.cxx_library(
+        name = "pthreadpool",
+        srcs = ["pthreadpool/src/legacy-api.c", "pthreadpool/src/memory.c", "pthreadpool/src/portable-api.c", "pthreadpool/src/pthreads.c"],
+        deps = [
+            ":FXdiv",
+        ],
+        exported_deps = [
+            ":pthreadpool_header",
+        ],
+        compiler_flags = [
+            "-w",
+            "-Os",
+            "-fstack-protector-strong",
+            "-fno-delete-null-pointer-checks",
+        ],
+        headers = {
+            "threadpool-atomics.h": "pthreadpool/src/threadpool-atomics.h",
+            "threadpool-common.h": "pthreadpool/src/threadpool-common.h",
+            "threadpool-object.h": "pthreadpool/src/threadpool-object.h",
+            "threadpool-utils.h": "pthreadpool/src/threadpool-utils.h",
+        },
+        header_namespace = "",
+        preferred_linkage = "static",
+        platform_preprocessor_flags = [["windows", ["-D_WINDOWS", "-D_WIN32", "-DWIN32", "-DNOMINMAX", "-D_CRT_SECURE_NO_WARNINGS", "-D_USE_MATH_DEFINES"]], ["windows.*64$", ["-D_WIN64"]]],
+        preprocessor_flags = ["-DPTHREADPOOL_USE_FUTEX=0", "-DPTHREADPOOL_USE_GCD=0"],
+        visibility = ["PUBLIC"],
+    )
+
+    # @lint-ignore BUCKLINT: native and fb_native are explicitly forbidden in fbcode.
+    native.cxx_library(
+        name = "pthreadpool_header",
+        header_namespace = "",
+        exported_headers = {
+            "pthreadpool.h": "pthreadpool/include/pthreadpool.h",
+        },
+        visibility = ["PUBLIC"],
+    )