Add system stack

internal/clashtcpip/tcpip_arm64.go

@@ -0,0 +1,24 @@
+package clashtcpip
+
+import (
+	"unsafe"
+
+	"golang.org/x/sys/cpu"
+)
+
+//go:noescape
+func sumAsmNeon(data unsafe.Pointer, length uintptr) uintptr
+
+func SumNeon(data []byte) uint32 {
+	if len(data) == 0 {
+		return 0
+	}
+
+	return uint32(sumAsmNeon(unsafe.Pointer(&data[0]), uintptr(len(data))))
+}
+
+func init() {
+	if cpu.ARM64.HasASIMD {
+		SumFnc = SumNeon
+	}
+}