--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SDL3/SDL_intrin.h	Mon Jan 05 02:15:46 2026 -0500
@@ -0,0 +1,410 @@
+/*
+  Simple DirectMedia Layer
+  Copyright (C) 1997-2025 Sam Lantinga <slouken@libsdl.org>
+
+  This software is provided 'as-is', without any express or implied
+  warranty.  In no event will the authors be held liable for any damages
+  arising from the use of this software.
+
+  Permission is granted to anyone to use this software for any purpose,
+  including commercial applications, and to alter it and redistribute it
+  freely, subject to the following restrictions:
+
+  1. The origin of this software must not be misrepresented; you must not
+     claim that you wrote the original software. If you use this software
+     in a product, an acknowledgment in the product documentation would be
+     appreciated but is not required.
+  2. Altered source versions must be plainly marked as such, and must not be
+     misrepresented as being the original software.
+  3. This notice may not be removed or altered from any source distribution.
+*/
+
+/* WIKI CATEGORY: Intrinsics */
+
+/**
+ * # CategoryIntrinsics
+ *
+ * SDL does some preprocessor gymnastics to determine if any CPU-specific
+ * compiler intrinsics are available, as this is not necessarily an easy thing
+ * to calculate, and sometimes depends on quirks of a system, versions of
+ * build tools, and other external forces.
+ *
+ * Apps including SDL's headers will be able to check consistent preprocessor
+ * definitions to decide if it's safe to use compiler intrinsics for a
+ * specific CPU architecture. This check only tells you that the compiler is
+ * capable of using those intrinsics; at runtime, you should still check if
+ * they are available on the current system with the
+ * [CPU info functions](https://wiki.libsdl.org/SDL3/CategoryCPUInfo)
+ * , such as SDL_HasSSE() or SDL_HasNEON(). Otherwise, the process might crash
+ * for using an unsupported CPU instruction.
+ *
+ * SDL only sets preprocessor defines for CPU intrinsics if they are
+ * supported, so apps should check with `#ifdef` and not `#if`.
+ *
+ * SDL will also include the appropriate instruction-set-specific support
+ * headers, so if SDL decides to define SDL_SSE2_INTRINSICS, it will also
+ * `#include <emmintrin.h>` as well.
+ */
+
+#ifndef SDL_intrin_h_
+#define SDL_intrin_h_
+
+#include <SDL3/SDL_stdinc.h>
+
+#ifdef SDL_WIKI_DOCUMENTATION_SECTION
+
+/**
+ * Defined if (and only if) the compiler supports Loongarch LSX intrinsics.
+ *
+ * If this macro is defined, SDL will have already included `<lsxintrin.h>`
+ *
+ * \since This macro is available since SDL 3.2.0.
+ *
+ * \sa SDL_LASX_INTRINSICS
+ */
+#define SDL_LSX_INTRINSICS 1
+
+/**
+ * Defined if (and only if) the compiler supports Loongarch LSX intrinsics.
+ *
+ * If this macro is defined, SDL will have already included `<lasxintrin.h>`
+ *
+ * \since This macro is available since SDL 3.2.0.
+ *
+ * \sa SDL_LASX_INTRINSICS
+ */
+#define SDL_LASX_INTRINSICS 1
+
+/**
+ * Defined if (and only if) the compiler supports ARM NEON intrinsics.
+ *
+ * If this macro is defined, SDL will have already included `<armintr.h>`
+ * `<arm_neon.h>`, `<arm64intr.h>`, and `<arm64_neon.h>`, as appropriate.
+ *
+ * \since This macro is available since SDL 3.2.0.
+ */
+#define SDL_NEON_INTRINSICS 1
+
+/**
+ * Defined if (and only if) the compiler supports PowerPC Altivec intrinsics.
+ *
+ * If this macro is defined, SDL will have already included `<altivec.h>`
+ *
+ * \since This macro is available since SDL 3.2.0.
+ */
+#define SDL_ALTIVEC_INTRINSICS 1
+
+/**
+ * Defined if (and only if) the compiler supports Intel MMX intrinsics.
+ *
+ * If this macro is defined, SDL will have already included `<mmintrin.h>`
+ *
+ * \since This macro is available since SDL 3.2.0.
+ *
+ * \sa SDL_SSE_INTRINSICS
+ */
+#define SDL_MMX_INTRINSICS 1
+
+/**
+ * Defined if (and only if) the compiler supports Intel SSE intrinsics.
+ *
+ * If this macro is defined, SDL will have already included `<xmmintrin.h>`
+ *
+ * \since This macro is available since SDL 3.2.0.
+ *
+ * \sa SDL_SSE2_INTRINSICS
+ * \sa SDL_SSE3_INTRINSICS
+ * \sa SDL_SSE4_1_INTRINSICS
+ * \sa SDL_SSE4_2_INTRINSICS
+ */
+#define SDL_SSE_INTRINSICS 1
+
+/**
+ * Defined if (and only if) the compiler supports Intel SSE2 intrinsics.
+ *
+ * If this macro is defined, SDL will have already included `<emmintrin.h>`
+ *
+ * \since This macro is available since SDL 3.2.0.
+ *
+ * \sa SDL_SSE_INTRINSICS
+ * \sa SDL_SSE3_INTRINSICS
+ * \sa SDL_SSE4_1_INTRINSICS
+ * \sa SDL_SSE4_2_INTRINSICS
+ */
+#define SDL_SSE2_INTRINSICS 1
+
+/**
+ * Defined if (and only if) the compiler supports Intel SSE3 intrinsics.
+ *
+ * If this macro is defined, SDL will have already included `<pmmintrin.h>`
+ *
+ * \since This macro is available since SDL 3.2.0.
+ *
+ * \sa SDL_SSE_INTRINSICS
+ * \sa SDL_SSE2_INTRINSICS
+ * \sa SDL_SSE4_1_INTRINSICS
+ * \sa SDL_SSE4_2_INTRINSICS
+ */
+#define SDL_SSE3_INTRINSICS 1
+
+/**
+ * Defined if (and only if) the compiler supports Intel SSE4.1 intrinsics.
+ *
+ * If this macro is defined, SDL will have already included `<smmintrin.h>`
+ *
+ * \since This macro is available since SDL 3.2.0.
+ *
+ * \sa SDL_SSE_INTRINSICS
+ * \sa SDL_SSE2_INTRINSICS
+ * \sa SDL_SSE3_INTRINSICS
+ * \sa SDL_SSE4_2_INTRINSICS
+ */
+#define SDL_SSE4_1_INTRINSICS 1
+
+/**
+ * Defined if (and only if) the compiler supports Intel SSE4.2 intrinsics.
+ *
+ * If this macro is defined, SDL will have already included `<nmmintrin.h>`
+ *
+ * \since This macro is available since SDL 3.2.0.
+ *
+ * \sa SDL_SSE_INTRINSICS
+ * \sa SDL_SSE2_INTRINSICS
+ * \sa SDL_SSE3_INTRINSICS
+ * \sa SDL_SSE4_1_INTRINSICS
+ */
+#define SDL_SSE4_2_INTRINSICS 1
+
+/**
+ * Defined if (and only if) the compiler supports Intel AVX intrinsics.
+ *
+ * If this macro is defined, SDL will have already included `<immintrin.h>`
+ *
+ * \since This macro is available since SDL 3.2.0.
+ *
+ * \sa SDL_AVX2_INTRINSICS
+ * \sa SDL_AVX512F_INTRINSICS
+ */
+#define SDL_AVX_INTRINSICS 1
+
+/**
+ * Defined if (and only if) the compiler supports Intel AVX2 intrinsics.
+ *
+ * If this macro is defined, SDL will have already included `<immintrin.h>`
+ *
+ * \since This macro is available since SDL 3.2.0.
+ *
+ * \sa SDL_AVX_INTRINSICS
+ * \sa SDL_AVX512F_INTRINSICS
+ */
+#define SDL_AVX2_INTRINSICS 1
+
+/**
+ * Defined if (and only if) the compiler supports Intel AVX-512F intrinsics.
+ *
+ * AVX-512F is also sometimes referred to as "AVX-512 Foundation."
+ *
+ * If this macro is defined, SDL will have already included `<immintrin.h>`
+ *
+ * \since This macro is available since SDL 3.2.0.
+ *
+ * \sa SDL_AVX_INTRINSICS
+ * \sa SDL_AVX2_INTRINSICS
+ */
+#define SDL_AVX512F_INTRINSICS 1
+#endif
+
+/* Need to do this here because intrin.h has C++ code in it */
+/* Visual Studio 2005 has a bug where intrin.h conflicts with winnt.h */
+#if defined(_MSC_VER) && (_MSC_VER >= 1500) && (defined(_M_IX86) || defined(_M_X64))
+#ifdef __clang__
+/* As of Clang 11, '_m_prefetchw' is conflicting with the winnt.h's version,
+   so we define the needed '_m_prefetch' here as a pseudo-header, until the issue is fixed. */
+#ifndef __PRFCHWINTRIN_H
+#define __PRFCHWINTRIN_H
+static __inline__ void __attribute__((__always_inline__, __nodebug__))
+_m_prefetch(void *__P)
+{
+  __builtin_prefetch (__P, 0, 3 /* _MM_HINT_T0 */);
+}
+#endif /* __PRFCHWINTRIN_H */
+#endif /* __clang__ */
+#include <intrin.h>
+
+#elif defined(__MINGW64_VERSION_MAJOR)
+#include <intrin.h>
+#if defined(__ARM_NEON) && !defined(SDL_DISABLE_NEON)
+#  define SDL_NEON_INTRINSICS 1
+#  include <arm_neon.h>
+#endif
+
+#else
+/* altivec.h redefining bool causes a number of problems, see bugs 3993 and 4392, so you need to explicitly define SDL_ENABLE_ALTIVEC to have it included. */
+#if defined(__ALTIVEC__) && defined(SDL_ENABLE_ALTIVEC)
+#define SDL_ALTIVEC_INTRINSICS 1
+#include <altivec.h>
+#endif
+#ifndef SDL_DISABLE_NEON
+#  ifdef __ARM_NEON
+#    define SDL_NEON_INTRINSICS 1
+#    include <arm_neon.h>
+#  elif defined(SDL_PLATFORM_WINDOWS)
+/* Visual Studio doesn't define __ARM_ARCH, but _M_ARM (if set, always 7), and _M_ARM64 (if set, always 1). */
+#    ifdef _M_ARM
+#      define SDL_NEON_INTRINSICS 1
+#      include <armintr.h>
+#      include <arm_neon.h>
+#      define __ARM_NEON 1 /* Set __ARM_NEON so that it can be used elsewhere, at compile time */
+#    endif
+#    if defined (_M_ARM64)
+#      define SDL_NEON_INTRINSICS 1
+#      include <arm64intr.h>
+#      include <arm64_neon.h>
+#      define __ARM_NEON 1 /* Set __ARM_NEON so that it can be used elsewhere, at compile time */
+#      define __ARM_ARCH 8
+#    endif
+#  endif
+#endif
+#endif /* compiler version */
+
+#ifdef SDL_WIKI_DOCUMENTATION_SECTION
+
+/**
+ * A macro to decide if the compiler supports `__attribute__((target))`.
+ *
+ * Even though this is defined in SDL's public headers, it is generally not
+ * used directly by apps. Apps should probably just use SDL_TARGETING
+ * directly, instead.
+ *
+ * \since This macro is available since SDL 3.2.0.
+ *
+ * \sa SDL_TARGETING
+ */
+#define SDL_HAS_TARGET_ATTRIBS
+#elif defined(__loongarch64) && defined(__GNUC__) && (__GNUC__ >= 15)
+/* LoongArch requires GCC 15+ for target attribute support */
+# define SDL_HAS_TARGET_ATTRIBS
+#elif defined(__clang__) && defined(__has_attribute)
+# if __has_attribute(target)
+# define SDL_HAS_TARGET_ATTRIBS
+# endif
+#elif defined(__GNUC__) && !defined(__loongarch64) && (__GNUC__ + (__GNUC_MINOR__ >= 9) > 4) /* gcc >= 4.9 */
+# define SDL_HAS_TARGET_ATTRIBS
+#elif defined(__ICC) && __ICC >= 1600
+# define SDL_HAS_TARGET_ATTRIBS
+#endif
+
+
+#ifdef SDL_WIKI_DOCUMENTATION_SECTION
+
+/**
+ * A macro to tag a function as targeting a specific CPU architecture.
+ *
+ * This is a hint to the compiler that a function should be built with support
+ * for a CPU instruction set that might be different than the rest of the
+ * program.
+ *
+ * The particulars of this are explained in the GCC documentation:
+ *
+ * https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-target-function-attribute
+ *
+ * An example of using this feature is to turn on SSE2 support for a specific
+ * function, even if the rest of the source code is not compiled to use SSE2
+ * code:
+ *
+ * ```c
+ * #ifdef SDL_SSE2_INTRINSICS
+ * static void SDL_TARGETING("sse2") DoSomethingWithSSE2(char *x) {
+ *    ...use SSE2 intrinsic functions, etc...
+ * }
+ * #endif
+ *
+ * // later...
+ * #ifdef SDL_SSE2_INTRINSICS
+ * if (SDL_HasSSE2()) {
+ *     DoSomethingWithSSE2(str);
+ * }
+ * #endif
+ * ```
+ *
+ * The application is, on a whole, built without SSE2 instructions, so it will
+ * run on Intel machines that don't support SSE2. But then at runtime, it
+ * checks if the system supports the instructions, and then calls into a
+ * function that uses SSE2 opcodes. The ifdefs make sure that this code isn't
+ * used on platforms that don't have SSE2 at all.
+ *
+ * On compilers without target support, this is defined to nothing.
+ *
+ * This symbol is used by SDL internally, but apps and other libraries are
+ * welcome to use it for their own interfaces as well.
+ *
+ * \since This macro is available since SDL 3.2.0.
+ */
+#define SDL_TARGETING(x) __attribute__((target(x)))
+
+#elif defined(SDL_HAS_TARGET_ATTRIBS)
+# define SDL_TARGETING(x) __attribute__((target(x)))
+#else
+# define SDL_TARGETING(x)
+#endif
+
+#ifdef __loongarch64
+# ifndef SDL_DISABLE_LSX
+#  define SDL_LSX_INTRINSICS 1
+#  include <lsxintrin.h>
+# endif
+# ifndef SDL_DISABLE_LASX
+#  define SDL_LASX_INTRINSICS 1
+#  include <lasxintrin.h>
+# endif
+#endif
+
+#if defined(__x86_64__) || defined(_M_X64) || defined(__i386__) || defined(_M_IX86)
+# if ((defined(_MSC_VER) && !defined(_M_X64)) || defined(__MMX__) || defined(SDL_HAS_TARGET_ATTRIBS)) && !defined(SDL_DISABLE_MMX)
+#  define SDL_MMX_INTRINSICS 1
+#  include <mmintrin.h>
+# endif
+# if (defined(_MSC_VER) || defined(__SSE__) || defined(SDL_HAS_TARGET_ATTRIBS)) && !defined(SDL_DISABLE_SSE)
+#  define SDL_SSE_INTRINSICS 1
+#  include <xmmintrin.h>
+# endif
+# if (defined(_MSC_VER) || defined(__SSE2__) || defined(SDL_HAS_TARGET_ATTRIBS)) && !defined(SDL_DISABLE_SSE2)
+#  define SDL_SSE2_INTRINSICS 1
+#  include <emmintrin.h>
+# endif
+# if (defined(_MSC_VER) || defined(__SSE3__) || defined(SDL_HAS_TARGET_ATTRIBS)) && !defined(SDL_DISABLE_SSE3)
+#  define SDL_SSE3_INTRINSICS 1
+#  include <pmmintrin.h>
+# endif
+# if (defined(_MSC_VER) || defined(__SSE4_1__) || defined(SDL_HAS_TARGET_ATTRIBS)) && !defined(SDL_DISABLE_SSE4_1)
+#  define SDL_SSE4_1_INTRINSICS 1
+#  include <smmintrin.h>
+# endif
+# if (defined(_MSC_VER) || defined(__SSE4_2__) || defined(SDL_HAS_TARGET_ATTRIBS)) && !defined(SDL_DISABLE_SSE4_2)
+#  define SDL_SSE4_2_INTRINSICS 1
+#  include <nmmintrin.h>
+# endif
+# if defined(__clang__) && (defined(_MSC_VER) || defined(__SCE__)) && !defined(__AVX__) && !defined(SDL_DISABLE_AVX)
+#  define SDL_DISABLE_AVX       /* see https://reviews.llvm.org/D20291 and https://reviews.llvm.org/D79194 */
+# endif
+# if (defined(_MSC_VER) || defined(__AVX__) || defined(SDL_HAS_TARGET_ATTRIBS)) && !defined(_M_ARM64EC) && !defined(SDL_DISABLE_AVX)
+#  define SDL_AVX_INTRINSICS 1
+#  include <immintrin.h>
+# endif
+# if defined(__clang__) && (defined(_MSC_VER) || defined(__SCE__)) && !defined(__AVX2__) && !defined(SDL_DISABLE_AVX2)
+#  define SDL_DISABLE_AVX2      /* see https://reviews.llvm.org/D20291 and https://reviews.llvm.org/D79194 */
+# endif
+# if (defined(_MSC_VER) || defined(__AVX2__) || defined(SDL_HAS_TARGET_ATTRIBS)) && !defined(_M_ARM64EC) && !defined(SDL_DISABLE_AVX2)
+#  define SDL_AVX2_INTRINSICS 1
+#  include <immintrin.h>
+# endif
+# if defined(__clang__) && (defined(_MSC_VER) || defined(__SCE__)) && !defined(__AVX512F__) && !defined(SDL_DISABLE_AVX512F)
+#  define SDL_DISABLE_AVX512F   /* see https://reviews.llvm.org/D20291 and https://reviews.llvm.org/D79194 */
+# endif
+# if (defined(_MSC_VER) || defined(__AVX512F__) || defined(SDL_HAS_TARGET_ATTRIBS)) && !defined(_M_ARM64EC) && !defined(SDL_DISABLE_AVX512F)
+#  define SDL_AVX512F_INTRINSICS 1
+#  include <immintrin.h>
+# endif
+#endif /* defined(__x86_64__) || defined(_M_X64) || defined(__i386__) || defined(_M_IX86) */
+
+#endif /* SDL_intrin_h_ */