use sse2neon on arm64

Author: Dillonb

CMakeLists.txt

@@ -93,12 +93,18 @@ else ()
     set (X86 FALSE)
 endif ()
 
+if (CMAKE_SYSTEM_PROCESSOR MATCHES "(aarch64)|(AARCH64)|(arm64)|(ARM64)")
+    set (ARM64 TRUE)
+endif()
+
 check_c_compiler_flag("-mssse3" HAS_SSSE3)
 check_c_compiler_flag("-msse4.1" HAS_SSE4_1)
 
 if (HAS_SSSE3 AND HAS_SSE4_1 AND X86)
     set(DEFAULT_C_COMP_OPTIONS ${DEFAULT_C_COMP_OPTIONS} -mssse3 -msse4.1)
     ADD_COMPILE_DEFINITIONS(N64_HAVE_SSE)
+elseif(ARM64)
+    ADD_COMPILE_DEFINITIONS(N64_HAVE_SSE N64_USE_NEON)
 endif()
 
 add_compile_options("$<$<COMPILE_LANGUAGE:C>:${DEFAULT_C_COMP_OPTIONS}>")

src/common/util.h

@@ -6,8 +6,12 @@
 #include <stdio.h>
 
 #ifdef N64_HAVE_SSE
+#ifdef N64_USE_NEON
+#include <sse2neon.h>
+#else
 #include <emmintrin.h>
 #endif
+#endif
 
 typedef uint8_t u8;
 typedef uint16_t u16;