[Apple Arm] introduce sse2neon

external/sse2neon/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2015-2025 SSE2NEON Contributors
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

src/backend/Core.cpp

@@ -3,7 +3,7 @@
 #include <Scheduler.hpp>
 
 namespace n64 {
-Core::Core() : cpu(std::make_unique<JIT>(parallel)) {}
+Core::Core() : cpu(std::make_unique<Interpreter>(parallel)) {}
 
 void Core::Stop() {
   render = false;

src/backend/core/CMakeLists.txt

@@ -2,11 +2,16 @@ file(GLOB SOURCES *.cpp)
 file(GLOB HEADERS *.hpp)
 
 add_subdirectory(interpreter)
-add_subdirectory(jit)
+if(NOT ARM_APPLE)
+    add_subdirectory(jit)
+endif()
 add_subdirectory(mem)
 add_subdirectory(mmio)
 add_subdirectory(registers)
 add_subdirectory(rsp)
 
 add_library(core ${SOURCES} ${HEADERS})
-target_link_libraries(core PRIVATE jit interpreter mem mmio unarr registers rsp)
+target_link_libraries(core PRIVATE interpreter mem mmio unarr registers rsp)
+if(NOT ARM_APPLE)
+    target_link_libraries(core PRIVATE jit)
+endif()

src/common.hpp

@@ -1,7 +1,11 @@
 #pragma once
 #include <bitset>
 #include <cstdint>
+#ifdef __aarch64__
+#include <sse2neon.h>
+#else
 #include <emmintrin.h>
+#endif  
 
 using u8 = uint8_t;
 using u16 = uint16_t;

src/frontend/CMakeLists.txt

@@ -9,9 +9,11 @@ find_package(Qt6 REQUIRED COMPONENTS Core Gui Widgets)
 if (WIN32)
   add_compile_definitions(NOMINMAX)
 endif ()
+
 if(APPLE)
   enable_language(OBJC)
 endif()
+
 include_directories(
   .
   ../
@@ -38,6 +40,7 @@ include_directories(
   ../../external/parallel-rdp/parallel-rdp-standalone/util
   ../../external/unarr
   ../../external/SDL/include
+  ../../external/sse2neon
   ../../external/capstone/include
 )
 
@@ -48,11 +51,22 @@ option(BUILD_SHARED_LIBS OFF)
 
 include(CheckCCompilerFlag)
 
-check_c_compiler_flag(-msse4.1 HAS_SSE4_1)
+check_c_compiler_flag(-msse4.1 HAS_SIMD)
+if(NOT HAS_SIMD)
+  check_c_compiler_flag(-mfpu=neon HAS_SIMD)
+  if(APPLE AND HAS_SIMD)
+    set(ARM_APPLE ON)
+    message("Compiling on ARM MacOS, very experimental and cool!")
+  endif()
+endif()
 
-if (HAS_SSE4_1)
+if (HAS_SIMD)
   add_compile_definitions(SIMD_SUPPORT)
+  if(ARM_APPLE)
+    add_compile_options(-mfpu=neon)
+  else()
     add_compile_options(-msse3 -msse4.1)
+  endif()
 endif ()
 
 if (${CMAKE_BUILD_TYPE} MATCHES Debug)

src/utils/FloatingPoint.hpp

@@ -1,7 +1,6 @@
 #pragma once
 #include <cmath>
 #include <common.hpp>
-#include <immintrin.h>
 
 namespace Util {
 static FORCE_INLINE auto roundCeil(float f) {