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SDL_intrin.h: Add documentation.

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Ryan C. Gordon 2024-12-17 23:24:28 -05:00
parent 2f68efda83
commit 6730cf7bed
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2 changed files with 170 additions and 3 deletions
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171
include/SDL3/SDL_intrin.h
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@ -19,8 +19,31 @@
3. This notice may not be removed or altered from any source distribution.
*/
/*
* Header file for CPU intrinsics for SDL
/* 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_
@ -28,6 +51,150 @@
#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 3.1.3.
*
* \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 3.1.3.
*
* \sa SDL_LASX_INTRINSICS
*/
#define SDL_LASX_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 3.1.3.
*
* \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 3.1.3.
*
* \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 3.1.3.
*
* \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 3.1.3.
*
* \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 3.1.3.
*
* \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 3.1.3.
*
* \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 3.1.3.
*
* \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 3.1.3.
*
* \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 3.1.3.
*
* \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))