/*
Simple DirectMedia Layer
- Copyright (C) 1997-2016 Sam Lantinga <slouken@libsdl.org>
+ Copyright (C) 1997-2019 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
* CPU feature detection for SDL.
*/
-#ifndef _SDL_cpuinfo_h
-#define _SDL_cpuinfo_h
+#ifndef SDL_cpuinfo_h_
+#define SDL_cpuinfo_h_
#include "SDL_stdinc.h"
/* 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__
+/* Many of the intrinsics SDL uses are not implemented by clang with Visual Studio */
+#undef __MMX__
+#undef __SSE__
+#undef __SSE2__
+#else
#include <intrin.h>
#ifndef _WIN64
+#ifndef __MMX__
#define __MMX__
+#endif
+#ifndef __3dNOW__
#define __3dNOW__
#endif
+#endif
+#ifndef __SSE__
#define __SSE__
+#endif
+#ifndef __SSE2__
#define __SSE2__
+#endif
+#endif /* __clang__ */
#elif defined(__MINGW64_VERSION_MAJOR)
#include <intrin.h>
#else
-#ifdef __ALTIVEC__
-#if HAVE_ALTIVEC_H && !defined(__APPLE_ALTIVEC__)
+/* altivec.h redefining bool causes a number of problems, see bugs 3993 and 4392, so you need to explicitly define SDL_ENABLE_ALTIVEC_H to have it included. */
+#if defined(HAVE_ALTIVEC_H) && defined(__ALTIVEC__) && !defined(__APPLE_ALTIVEC__) && defined(SDL_ENABLE_ALTIVEC_H)
#include <altivec.h>
-#undef pixel
#endif
+#if !defined(SDL_DISABLE_ARM_NEON_H)
+# if defined(__ARM_NEON)
+# include <arm_neon.h>
+# elif defined(__WINDOWS__) || defined(__WINRT__)
+/* Visual Studio doesn't define __ARM_ARCH, but _M_ARM (if set, always 7), and _M_ARM64 (if set, always 1). */
+# if defined(_M_ARM)
+# 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)
+# 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
+# endif
#endif
-#ifdef __MMX__
-#include <mmintrin.h>
-#endif
-#ifdef __3dNOW__
+#if defined(__3dNOW__) && !defined(SDL_DISABLE_MM3DNOW_H)
#include <mm3dnow.h>
#endif
-#ifdef __SSE__
+#if defined(HAVE_IMMINTRIN_H) && !defined(SDL_DISABLE_IMMINTRIN_H)
+#include <immintrin.h>
+#else
+#if defined(__MMX__) && !defined(SDL_DISABLE_MMINTRIN_H)
+#include <mmintrin.h>
+#endif
+#if defined(__SSE__) && !defined(SDL_DISABLE_XMMINTRIN_H)
#include <xmmintrin.h>
#endif
-#ifdef __SSE2__
+#if defined(__SSE2__) && !defined(SDL_DISABLE_EMMINTRIN_H)
#include <emmintrin.h>
#endif
+#if defined(__SSE3__) && !defined(SDL_DISABLE_PMMINTRIN_H)
+#include <pmmintrin.h>
#endif
+#endif /* HAVE_IMMINTRIN_H */
+#endif /* compiler version */
#include "begin_code.h"
/* Set up for C function definitions, even when using C++ */
*/
extern DECLSPEC SDL_bool SDLCALL SDL_HasAVX2(void);
+/**
+ * This function returns true if the CPU has AVX-512F (foundation) features.
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_HasAVX512F(void);
+
+/**
+ * This function returns true if the CPU has NEON (ARM SIMD) features.
+ */
+extern DECLSPEC SDL_bool SDLCALL SDL_HasNEON(void);
+
/**
* This function returns the amount of RAM configured in the system, in MB.
*/
extern DECLSPEC int SDLCALL SDL_GetSystemRAM(void);
+/**
+ * \brief Report the alignment this system needs for SIMD allocations.
+ *
+ * This will return the minimum number of bytes to which a pointer must be
+ * aligned to be compatible with SIMD instructions on the current machine.
+ * For example, if the machine supports SSE only, it will return 16, but if
+ * it supports AVX-512F, it'll return 64 (etc). This only reports values for
+ * instruction sets SDL knows about, so if your SDL build doesn't have
+ * SDL_HasAVX512F(), then it might return 16 for the SSE support it sees and
+ * not 64 for the AVX-512 instructions that exist but SDL doesn't know about.
+ * Plan accordingly.
+ */
+extern DECLSPEC size_t SDLCALL SDL_SIMDGetAlignment(void);
+
+/**
+ * \brief Allocate memory in a SIMD-friendly way.
+ *
+ * This will allocate a block of memory that is suitable for use with SIMD
+ * instructions. Specifically, it will be properly aligned and padded for
+ * the system's supported vector instructions.
+ *
+ * The memory returned will be padded such that it is safe to read or write
+ * an incomplete vector at the end of the memory block. This can be useful
+ * so you don't have to drop back to a scalar fallback at the end of your
+ * SIMD processing loop to deal with the final elements without overflowing
+ * the allocated buffer.
+ *
+ * You must free this memory with SDL_FreeSIMD(), not free() or SDL_free()
+ * or delete[], etc.
+ *
+ * Note that SDL will only deal with SIMD instruction sets it is aware of;
+ * for example, SDL 2.0.8 knows that SSE wants 16-byte vectors
+ * (SDL_HasSSE()), and AVX2 wants 32 bytes (SDL_HasAVX2()), but doesn't
+ * know that AVX-512 wants 64. To be clear: if you can't decide to use an
+ * instruction set with an SDL_Has*() function, don't use that instruction
+ * set with memory allocated through here.
+ *
+ * SDL_AllocSIMD(0) will return a non-NULL pointer, assuming the system isn't
+ * out of memory.
+ *
+ * \param len The length, in bytes, of the block to allocated. The actual
+ * allocated block might be larger due to padding, etc.
+ * \return Pointer to newly-allocated block, NULL if out of memory.
+ *
+ * \sa SDL_SIMDAlignment
+ * \sa SDL_SIMDFree
+ */
+extern DECLSPEC void * SDLCALL SDL_SIMDAlloc(const size_t len);
+
+/**
+ * \brief Deallocate memory obtained from SDL_SIMDAlloc
+ *
+ * It is not valid to use this function on a pointer from anything but
+ * SDL_SIMDAlloc(). It can't be used on pointers from malloc, realloc,
+ * SDL_malloc, memalign, new[], etc.
+ *
+ * However, SDL_SIMDFree(NULL) is a legal no-op.
+ *
+ * \sa SDL_SIMDAlloc
+ */
+extern DECLSPEC void SDLCALL SDL_SIMDFree(void *ptr);
+/* vi: set ts=4 sw=4 expandtab: */
/* Ends C function definitions when using C++ */
#ifdef __cplusplus
}
#endif
#include "close_code.h"
-#endif /* _SDL_cpuinfo_h */
+#endif /* SDL_cpuinfo_h_ */
/* vi: set ts=4 sw=4 expandtab: */
projects / xonotic / xonotic.git / blobdiff