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  1. /*
  2.   Simple DirectMedia Layer
  3.   Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
  4.  
  5.   This software is provided 'as-is', without any express or implied
  6.   warranty.  In no event will the authors be held liable for any damages
  7.   arising from the use of this software.
  8.  
  9.   Permission is granted to anyone to use this software for any purpose,
  10.   including commercial applications, and to alter it and redistribute it
  11.   freely, subject to the following restrictions:
  12.  
  13.   1. The origin of this software must not be misrepresented; you must not
  14.      claim that you wrote the original software. If you use this software
  15.      in a product, an acknowledgment in the product documentation would be
  16.      appreciated but is not required.
  17.   2. Altered source versions must be plainly marked as such, and must not be
  18.      misrepresented as being the original software.
  19.   3. This notice may not be removed or altered from any source distribution.
  20. */
  21.  
  22. /**
  23.  *  \file SDL_cpuinfo.h
  24.  *
  25.  *  CPU feature detection for SDL.
  26.  */
  27.  
  28. #ifndef SDL_cpuinfo_h_
  29. #define SDL_cpuinfo_h_
  30.  
  31. #include "SDL_stdinc.h"
  32.  
  33. /* Need to do this here because intrin.h has C++ code in it */
  34. /* Visual Studio 2005 has a bug where intrin.h conflicts with winnt.h */
  35. #if defined(_MSC_VER) && (_MSC_VER >= 1500) && (defined(_M_IX86) || defined(_M_X64))
  36. #ifdef __clang__
  37. /* As of Clang 11, '_m_prefetchw' is conflicting with the winnt.h's version,
  38.    so we define the needed '_m_prefetch' here as a pseudo-header, until the issue is fixed. */
  39.  
  40. #ifndef __PRFCHWINTRIN_H
  41. #define __PRFCHWINTRIN_H
  42.  
  43. static __inline__ void __attribute__((__always_inline__, __nodebug__))
  44. _m_prefetch(void *__P)
  45. {
  46.   __builtin_prefetch (__P, 0, 3 /* _MM_HINT_T0 */);
  47. }
  48.  
  49. #endif /* __PRFCHWINTRIN_H */
  50. #endif /* __clang__ */
  51. #include <intrin.h>
  52. #ifndef _WIN64
  53. #ifndef __MMX__
  54. #define __MMX__
  55. #endif
  56. #ifndef __3dNOW__
  57. #define __3dNOW__
  58. #endif
  59. #endif
  60. #ifndef __SSE__
  61. #define __SSE__
  62. #endif
  63. #ifndef __SSE2__
  64. #define __SSE2__
  65. #endif
  66. #ifndef __SSE3__
  67. #define __SSE3__
  68. #endif
  69. #elif defined(__MINGW64_VERSION_MAJOR)
  70. #include <intrin.h>
  71. #if !defined(SDL_DISABLE_ARM_NEON_H) && defined(__ARM_NEON)
  72. #  include <arm_neon.h>
  73. #endif
  74. #else
  75. /* 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. */
  76. #if defined(HAVE_ALTIVEC_H) && defined(__ALTIVEC__) && !defined(__APPLE_ALTIVEC__) && defined(SDL_ENABLE_ALTIVEC_H)
  77. #include <altivec.h>
  78. #endif
  79. #if !defined(SDL_DISABLE_ARM_NEON_H)
  80. #  if defined(__ARM_NEON)
  81. #    include <arm_neon.h>
  82. #  elif defined(__WINDOWS__) || defined(__WINRT__) || defined(__GDK__)
  83. /* Visual Studio doesn't define __ARM_ARCH, but _M_ARM (if set, always 7), and _M_ARM64 (if set, always 1). */
  84. #    if defined(_M_ARM)
  85. #      include <armintr.h>
  86. #      include <arm_neon.h>
  87. #      define __ARM_NEON 1 /* Set __ARM_NEON so that it can be used elsewhere, at compile time */
  88. #    endif
  89. #    if defined (_M_ARM64)
  90. #      include <arm64intr.h>
  91. #      include <arm64_neon.h>
  92. #      define __ARM_NEON 1 /* Set __ARM_NEON so that it can be used elsewhere, at compile time */
  93. #      define __ARM_ARCH 8
  94. #    endif
  95. #  endif
  96. #endif
  97. #endif /* compiler version */
  98.  
  99. #if defined(__3dNOW__) && !defined(SDL_DISABLE_MM3DNOW_H)
  100. #include <mm3dnow.h>
  101. #endif
  102. #if defined(__loongarch_sx) && !defined(SDL_DISABLE_LSX_H)
  103. #include <lsxintrin.h>
  104. #define __LSX__
  105. #endif
  106. #if defined(__loongarch_asx) && !defined(SDL_DISABLE_LASX_H)
  107. #include <lasxintrin.h>
  108. #define __LASX__
  109. #endif
  110. #if defined(HAVE_IMMINTRIN_H) && !defined(SDL_DISABLE_IMMINTRIN_H)
  111. #include <immintrin.h>
  112. #else
  113. #if defined(__MMX__) && !defined(SDL_DISABLE_MMINTRIN_H)
  114. #include <mmintrin.h>
  115. #endif
  116. #if defined(__SSE__) && !defined(SDL_DISABLE_XMMINTRIN_H)
  117. #include <xmmintrin.h>
  118. #endif
  119. #if defined(__SSE2__) && !defined(SDL_DISABLE_EMMINTRIN_H)
  120. #include <emmintrin.h>
  121. #endif
  122. #if defined(__SSE3__) && !defined(SDL_DISABLE_PMMINTRIN_H)
  123. #include <pmmintrin.h>
  124. #endif
  125. #endif /* HAVE_IMMINTRIN_H */
  126.  
  127. #include "begin_code.h"
  128. /* Set up for C function definitions, even when using C++ */
  129. #ifdef __cplusplus
  130. extern "C" {
  131. #endif
  132.  
  133. /* This is a guess for the cacheline size used for padding.
  134.  * Most x86 processors have a 64 byte cache line.
  135.  * The 64-bit PowerPC processors have a 128 byte cache line.
  136.  * We'll use the larger value to be generally safe.
  137.  */
  138. #define SDL_CACHELINE_SIZE  128
  139.  
  140. /**
  141.  * Get the number of CPU cores available.
  142.  *
  143.  * \returns the total number of logical CPU cores. On CPUs that include
  144.  *          technologies such as hyperthreading, the number of logical cores
  145.  *          may be more than the number of physical cores.
  146.  *
  147.  * \since This function is available since SDL 2.0.0.
  148.  */
  149. extern DECLSPEC int SDLCALL SDL_GetCPUCount(void);
  150.  
  151. /**
  152.  * Determine the L1 cache line size of the CPU.
  153.  *
  154.  * This is useful for determining multi-threaded structure padding or SIMD
  155.  * prefetch sizes.
  156.  *
  157.  * \returns the L1 cache line size of the CPU, in bytes.
  158.  *
  159.  * \since This function is available since SDL 2.0.0.
  160.  */
  161. extern DECLSPEC int SDLCALL SDL_GetCPUCacheLineSize(void);
  162.  
  163. /**
  164.  * Determine whether the CPU has the RDTSC instruction.
  165.  *
  166.  * This always returns false on CPUs that aren't using Intel instruction sets.
  167.  *
  168.  * \returns SDL_TRUE if the CPU has the RDTSC instruction or SDL_FALSE if not.
  169.  *
  170.  * \since This function is available since SDL 2.0.0.
  171.  *
  172.  * \sa SDL_Has3DNow
  173.  * \sa SDL_HasAltiVec
  174.  * \sa SDL_HasAVX
  175.  * \sa SDL_HasAVX2
  176.  * \sa SDL_HasMMX
  177.  * \sa SDL_HasSSE
  178.  * \sa SDL_HasSSE2
  179.  * \sa SDL_HasSSE3
  180.  * \sa SDL_HasSSE41
  181.  * \sa SDL_HasSSE42
  182.  */
  183. extern DECLSPEC SDL_bool SDLCALL SDL_HasRDTSC(void);
  184.  
  185. /**
  186.  * Determine whether the CPU has AltiVec features.
  187.  *
  188.  * This always returns false on CPUs that aren't using PowerPC instruction
  189.  * sets.
  190.  *
  191.  * \returns SDL_TRUE if the CPU has AltiVec features or SDL_FALSE if not.
  192.  *
  193.  * \since This function is available since SDL 2.0.0.
  194.  *
  195.  * \sa SDL_Has3DNow
  196.  * \sa SDL_HasAVX
  197.  * \sa SDL_HasAVX2
  198.  * \sa SDL_HasMMX
  199.  * \sa SDL_HasRDTSC
  200.  * \sa SDL_HasSSE
  201.  * \sa SDL_HasSSE2
  202.  * \sa SDL_HasSSE3
  203.  * \sa SDL_HasSSE41
  204.  * \sa SDL_HasSSE42
  205.  */
  206. extern DECLSPEC SDL_bool SDLCALL SDL_HasAltiVec(void);
  207.  
  208. /**
  209.  * Determine whether the CPU has MMX features.
  210.  *
  211.  * This always returns false on CPUs that aren't using Intel instruction sets.
  212.  *
  213.  * \returns SDL_TRUE if the CPU has MMX features or SDL_FALSE if not.
  214.  *
  215.  * \since This function is available since SDL 2.0.0.
  216.  *
  217.  * \sa SDL_Has3DNow
  218.  * \sa SDL_HasAltiVec
  219.  * \sa SDL_HasAVX
  220.  * \sa SDL_HasAVX2
  221.  * \sa SDL_HasRDTSC
  222.  * \sa SDL_HasSSE
  223.  * \sa SDL_HasSSE2
  224.  * \sa SDL_HasSSE3
  225.  * \sa SDL_HasSSE41
  226.  * \sa SDL_HasSSE42
  227.  */
  228. extern DECLSPEC SDL_bool SDLCALL SDL_HasMMX(void);
  229.  
  230. /**
  231.  * Determine whether the CPU has 3DNow! features.
  232.  *
  233.  * This always returns false on CPUs that aren't using AMD instruction sets.
  234.  *
  235.  * \returns SDL_TRUE if the CPU has 3DNow! features or SDL_FALSE if not.
  236.  *
  237.  * \since This function is available since SDL 2.0.0.
  238.  *
  239.  * \sa SDL_HasAltiVec
  240.  * \sa SDL_HasAVX
  241.  * \sa SDL_HasAVX2
  242.  * \sa SDL_HasMMX
  243.  * \sa SDL_HasRDTSC
  244.  * \sa SDL_HasSSE
  245.  * \sa SDL_HasSSE2
  246.  * \sa SDL_HasSSE3
  247.  * \sa SDL_HasSSE41
  248.  * \sa SDL_HasSSE42
  249.  */
  250. extern DECLSPEC SDL_bool SDLCALL SDL_Has3DNow(void);
  251.  
  252. /**
  253.  * Determine whether the CPU has SSE features.
  254.  *
  255.  * This always returns false on CPUs that aren't using Intel instruction sets.
  256.  *
  257.  * \returns SDL_TRUE if the CPU has SSE features or SDL_FALSE if not.
  258.  *
  259.  * \since This function is available since SDL 2.0.0.
  260.  *
  261.  * \sa SDL_Has3DNow
  262.  * \sa SDL_HasAltiVec
  263.  * \sa SDL_HasAVX
  264.  * \sa SDL_HasAVX2
  265.  * \sa SDL_HasMMX
  266.  * \sa SDL_HasRDTSC
  267.  * \sa SDL_HasSSE2
  268.  * \sa SDL_HasSSE3
  269.  * \sa SDL_HasSSE41
  270.  * \sa SDL_HasSSE42
  271.  */
  272. extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE(void);
  273.  
  274. /**
  275.  * Determine whether the CPU has SSE2 features.
  276.  *
  277.  * This always returns false on CPUs that aren't using Intel instruction sets.
  278.  *
  279.  * \returns SDL_TRUE if the CPU has SSE2 features or SDL_FALSE if not.
  280.  *
  281.  * \since This function is available since SDL 2.0.0.
  282.  *
  283.  * \sa SDL_Has3DNow
  284.  * \sa SDL_HasAltiVec
  285.  * \sa SDL_HasAVX
  286.  * \sa SDL_HasAVX2
  287.  * \sa SDL_HasMMX
  288.  * \sa SDL_HasRDTSC
  289.  * \sa SDL_HasSSE
  290.  * \sa SDL_HasSSE3
  291.  * \sa SDL_HasSSE41
  292.  * \sa SDL_HasSSE42
  293.  */
  294. extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE2(void);
  295.  
  296. /**
  297.  * Determine whether the CPU has SSE3 features.
  298.  *
  299.  * This always returns false on CPUs that aren't using Intel instruction sets.
  300.  *
  301.  * \returns SDL_TRUE if the CPU has SSE3 features or SDL_FALSE if not.
  302.  *
  303.  * \since This function is available since SDL 2.0.0.
  304.  *
  305.  * \sa SDL_Has3DNow
  306.  * \sa SDL_HasAltiVec
  307.  * \sa SDL_HasAVX
  308.  * \sa SDL_HasAVX2
  309.  * \sa SDL_HasMMX
  310.  * \sa SDL_HasRDTSC
  311.  * \sa SDL_HasSSE
  312.  * \sa SDL_HasSSE2
  313.  * \sa SDL_HasSSE41
  314.  * \sa SDL_HasSSE42
  315.  */
  316. extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE3(void);
  317.  
  318. /**
  319.  * Determine whether the CPU has SSE4.1 features.
  320.  *
  321.  * This always returns false on CPUs that aren't using Intel instruction sets.
  322.  *
  323.  * \returns SDL_TRUE if the CPU has SSE4.1 features or SDL_FALSE if not.
  324.  *
  325.  * \since This function is available since SDL 2.0.0.
  326.  *
  327.  * \sa SDL_Has3DNow
  328.  * \sa SDL_HasAltiVec
  329.  * \sa SDL_HasAVX
  330.  * \sa SDL_HasAVX2
  331.  * \sa SDL_HasMMX
  332.  * \sa SDL_HasRDTSC
  333.  * \sa SDL_HasSSE
  334.  * \sa SDL_HasSSE2
  335.  * \sa SDL_HasSSE3
  336.  * \sa SDL_HasSSE42
  337.  */
  338. extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE41(void);
  339.  
  340. /**
  341.  * Determine whether the CPU has SSE4.2 features.
  342.  *
  343.  * This always returns false on CPUs that aren't using Intel instruction sets.
  344.  *
  345.  * \returns SDL_TRUE if the CPU has SSE4.2 features or SDL_FALSE if not.
  346.  *
  347.  * \since This function is available since SDL 2.0.0.
  348.  *
  349.  * \sa SDL_Has3DNow
  350.  * \sa SDL_HasAltiVec
  351.  * \sa SDL_HasAVX
  352.  * \sa SDL_HasAVX2
  353.  * \sa SDL_HasMMX
  354.  * \sa SDL_HasRDTSC
  355.  * \sa SDL_HasSSE
  356.  * \sa SDL_HasSSE2
  357.  * \sa SDL_HasSSE3
  358.  * \sa SDL_HasSSE41
  359.  */
  360. extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE42(void);
  361.  
  362. /**
  363.  * Determine whether the CPU has AVX features.
  364.  *
  365.  * This always returns false on CPUs that aren't using Intel instruction sets.
  366.  *
  367.  * \returns SDL_TRUE if the CPU has AVX features or SDL_FALSE if not.
  368.  *
  369.  * \since This function is available since SDL 2.0.2.
  370.  *
  371.  * \sa SDL_Has3DNow
  372.  * \sa SDL_HasAltiVec
  373.  * \sa SDL_HasAVX2
  374.  * \sa SDL_HasMMX
  375.  * \sa SDL_HasRDTSC
  376.  * \sa SDL_HasSSE
  377.  * \sa SDL_HasSSE2
  378.  * \sa SDL_HasSSE3
  379.  * \sa SDL_HasSSE41
  380.  * \sa SDL_HasSSE42
  381.  */
  382. extern DECLSPEC SDL_bool SDLCALL SDL_HasAVX(void);
  383.  
  384. /**
  385.  * Determine whether the CPU has AVX2 features.
  386.  *
  387.  * This always returns false on CPUs that aren't using Intel instruction sets.
  388.  *
  389.  * \returns SDL_TRUE if the CPU has AVX2 features or SDL_FALSE if not.
  390.  *
  391.  * \since This function is available since SDL 2.0.4.
  392.  *
  393.  * \sa SDL_Has3DNow
  394.  * \sa SDL_HasAltiVec
  395.  * \sa SDL_HasAVX
  396.  * \sa SDL_HasMMX
  397.  * \sa SDL_HasRDTSC
  398.  * \sa SDL_HasSSE
  399.  * \sa SDL_HasSSE2
  400.  * \sa SDL_HasSSE3
  401.  * \sa SDL_HasSSE41
  402.  * \sa SDL_HasSSE42
  403.  */
  404. extern DECLSPEC SDL_bool SDLCALL SDL_HasAVX2(void);
  405.  
  406. /**
  407.  * Determine whether the CPU has AVX-512F (foundation) features.
  408.  *
  409.  * This always returns false on CPUs that aren't using Intel instruction sets.
  410.  *
  411.  * \returns SDL_TRUE if the CPU has AVX-512F features or SDL_FALSE if not.
  412.  *
  413.  * \since This function is available since SDL 2.0.9.
  414.  *
  415.  * \sa SDL_HasAVX
  416.  */
  417. extern DECLSPEC SDL_bool SDLCALL SDL_HasAVX512F(void);
  418.  
  419. /**
  420.  * Determine whether the CPU has ARM SIMD (ARMv6) features.
  421.  *
  422.  * This is different from ARM NEON, which is a different instruction set.
  423.  *
  424.  * This always returns false on CPUs that aren't using ARM instruction sets.
  425.  *
  426.  * \returns SDL_TRUE if the CPU has ARM SIMD features or SDL_FALSE if not.
  427.  *
  428.  * \since This function is available since SDL 2.0.12.
  429.  *
  430.  * \sa SDL_HasNEON
  431.  */
  432. extern DECLSPEC SDL_bool SDLCALL SDL_HasARMSIMD(void);
  433.  
  434. /**
  435.  * Determine whether the CPU has NEON (ARM SIMD) features.
  436.  *
  437.  * This always returns false on CPUs that aren't using ARM instruction sets.
  438.  *
  439.  * \returns SDL_TRUE if the CPU has ARM NEON features or SDL_FALSE if not.
  440.  *
  441.  * \since This function is available since SDL 2.0.6.
  442.  */
  443. extern DECLSPEC SDL_bool SDLCALL SDL_HasNEON(void);
  444.  
  445. /**
  446.  * Determine whether the CPU has LSX (LOONGARCH SIMD) features.
  447.  *
  448.  * This always returns false on CPUs that aren't using LOONGARCH instruction
  449.  * sets.
  450.  *
  451.  * \returns SDL_TRUE if the CPU has LOONGARCH LSX features or SDL_FALSE if
  452.  *          not.
  453.  *
  454.  * \since This function is available since SDL 2.24.0.
  455.  */
  456. extern DECLSPEC SDL_bool SDLCALL SDL_HasLSX(void);
  457.  
  458. /**
  459.  * Determine whether the CPU has LASX (LOONGARCH SIMD) features.
  460.  *
  461.  * This always returns false on CPUs that aren't using LOONGARCH instruction
  462.  * sets.
  463.  *
  464.  * \returns SDL_TRUE if the CPU has LOONGARCH LASX features or SDL_FALSE if
  465.  *          not.
  466.  *
  467.  * \since This function is available since SDL 2.24.0.
  468.  */
  469. extern DECLSPEC SDL_bool SDLCALL SDL_HasLASX(void);
  470.  
  471. /**
  472.  * Get the amount of RAM configured in the system.
  473.  *
  474.  * \returns the amount of RAM configured in the system in MiB.
  475.  *
  476.  * \since This function is available since SDL 2.0.1.
  477.  */
  478. extern DECLSPEC int SDLCALL SDL_GetSystemRAM(void);
  479.  
  480. /**
  481.  * Report the alignment this system needs for SIMD allocations.
  482.  *
  483.  * This will return the minimum number of bytes to which a pointer must be
  484.  * aligned to be compatible with SIMD instructions on the current machine. For
  485.  * example, if the machine supports SSE only, it will return 16, but if it
  486.  * supports AVX-512F, it'll return 64 (etc). This only reports values for
  487.  * instruction sets SDL knows about, so if your SDL build doesn't have
  488.  * SDL_HasAVX512F(), then it might return 16 for the SSE support it sees and
  489.  * not 64 for the AVX-512 instructions that exist but SDL doesn't know about.
  490.  * Plan accordingly.
  491.  *
  492.  * \returns the alignment in bytes needed for available, known SIMD
  493.  *          instructions.
  494.  *
  495.  * \since This function is available since SDL 2.0.10.
  496.  */
  497. extern DECLSPEC size_t SDLCALL SDL_SIMDGetAlignment(void);
  498.  
  499. /**
  500.  * Allocate memory in a SIMD-friendly way.
  501.  *
  502.  * This will allocate a block of memory that is suitable for use with SIMD
  503.  * instructions. Specifically, it will be properly aligned and padded for the
  504.  * system's supported vector instructions.
  505.  *
  506.  * The memory returned will be padded such that it is safe to read or write an
  507.  * incomplete vector at the end of the memory block. This can be useful so you
  508.  * don't have to drop back to a scalar fallback at the end of your SIMD
  509.  * processing loop to deal with the final elements without overflowing the
  510.  * allocated buffer.
  511.  *
  512.  * You must free this memory with SDL_FreeSIMD(), not free() or SDL_free() or
  513.  * delete[], etc.
  514.  *
  515.  * Note that SDL will only deal with SIMD instruction sets it is aware of; for
  516.  * example, SDL 2.0.8 knows that SSE wants 16-byte vectors (SDL_HasSSE()), and
  517.  * AVX2 wants 32 bytes (SDL_HasAVX2()), but doesn't know that AVX-512 wants
  518.  * 64. To be clear: if you can't decide to use an instruction set with an
  519.  * SDL_Has*() function, don't use that instruction set with memory allocated
  520.  * through here.
  521.  *
  522.  * SDL_AllocSIMD(0) will return a non-NULL pointer, assuming the system isn't
  523.  * out of memory, but you are not allowed to dereference it (because you only
  524.  * own zero bytes of that buffer).
  525.  *
  526.  * \param len The length, in bytes, of the block to allocate. The actual
  527.  *            allocated block might be larger due to padding, etc.
  528.  * \returns a pointer to the newly-allocated block, NULL if out of memory.
  529.  *
  530.  * \since This function is available since SDL 2.0.10.
  531.  *
  532.  * \sa SDL_SIMDGetAlignment
  533.  * \sa SDL_SIMDRealloc
  534.  * \sa SDL_SIMDFree
  535.  */
  536. extern DECLSPEC void * SDLCALL SDL_SIMDAlloc(const size_t len);
  537.  
  538. /**
  539.  * Reallocate memory obtained from SDL_SIMDAlloc
  540.  *
  541.  * It is not valid to use this function on a pointer from anything but
  542.  * SDL_SIMDAlloc(). It can't be used on pointers from malloc, realloc,
  543.  * SDL_malloc, memalign, new[], etc.
  544.  *
  545.  * \param mem The pointer obtained from SDL_SIMDAlloc. This function also
  546.  *            accepts NULL, at which point this function is the same as
  547.  *            calling SDL_SIMDAlloc with a NULL pointer.
  548.  * \param len The length, in bytes, of the block to allocated. The actual
  549.  *            allocated block might be larger due to padding, etc. Passing 0
  550.  *            will return a non-NULL pointer, assuming the system isn't out of
  551.  *            memory.
  552.  * \returns a pointer to the newly-reallocated block, NULL if out of memory.
  553.  *
  554.  * \since This function is available since SDL 2.0.14.
  555.  *
  556.  * \sa SDL_SIMDGetAlignment
  557.  * \sa SDL_SIMDAlloc
  558.  * \sa SDL_SIMDFree
  559.  */
  560. extern DECLSPEC void * SDLCALL SDL_SIMDRealloc(void *mem, const size_t len);
  561.  
  562. /**
  563.  * Deallocate memory obtained from SDL_SIMDAlloc
  564.  *
  565.  * It is not valid to use this function on a pointer from anything but
  566.  * SDL_SIMDAlloc() or SDL_SIMDRealloc(). It can't be used on pointers from
  567.  * malloc, realloc, SDL_malloc, memalign, new[], etc.
  568.  *
  569.  * However, SDL_SIMDFree(NULL) is a legal no-op.
  570.  *
  571.  * The memory pointed to by `ptr` is no longer valid for access upon return,
  572.  * and may be returned to the system or reused by a future allocation. The
  573.  * pointer passed to this function is no longer safe to dereference once this
  574.  * function returns, and should be discarded.
  575.  *
  576.  * \param ptr The pointer, returned from SDL_SIMDAlloc or SDL_SIMDRealloc, to
  577.  *            deallocate. NULL is a legal no-op.
  578.  *
  579.  * \since This function is available since SDL 2.0.10.
  580.  *
  581.  * \sa SDL_SIMDAlloc
  582.  * \sa SDL_SIMDRealloc
  583.  */
  584. extern DECLSPEC void SDLCALL SDL_SIMDFree(void *ptr);
  585.  
  586. /* Ends C function definitions when using C++ */
  587. #ifdef __cplusplus
  588. }
  589. #endif
  590. #include "close_code.h"
  591.  
  592. #endif /* SDL_cpuinfo_h_ */
  593.  
  594. /* vi: set ts=4 sw=4 expandtab: */
  595.