Common: Add intrin.h

src/common/intrin.h

@@ -0,0 +1,26 @@
+// SPDX-FileCopyrightText: 2019-2023 Connor McLaughlin <stenzek@gmail.com>
+// SPDX-License-Identifier: (GPL-3.0 OR CC-BY-NC-ND-4.0)
+
+// Includes appropriate intrinsic header based on platform.
+
+#pragma once
+
+#include "types.h"
+
+#if defined(CPU_ARCH_X86) || defined(CPU_ARCH_X64)
+#define CPU_ARCH_SSE 1
+#include <emmintrin.h>
+#elif defined(CPU_ARCH_ARM64)
+#define CPU_ARCH_NEON 1
+#ifdef _MSC_VER
+#include <arm64_neon.h>
+#else
+#include <arm_neon.h>
+#endif
+#endif
+
+#ifdef __APPLE__
+#include <stdlib.h> // alloca
+#else
+#include <malloc.h> // alloca
+#endif