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      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2014 Sam Lantinga <slouken (at) 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 #include <intrin.h>
     37 #ifndef _WIN64
     38 #define __MMX__
     39 #define __3dNOW__
     40 #endif
     41 #define __SSE__
     42 #define __SSE2__
     43 #elif defined(__MINGW64_VERSION_MAJOR)
     44 #include <intrin.h>
     45 #else
     46 #ifdef __ALTIVEC__
     47 #if HAVE_ALTIVEC_H && !defined(__APPLE_ALTIVEC__)
     48 #include <altivec.h>
     49 #undef pixel
     50 #endif
     51 #endif
     52 #ifdef __MMX__
     53 #include <mmintrin.h>
     54 #endif
     55 #ifdef __3dNOW__
     56 #include <mm3dnow.h>
     57 #endif
     58 #ifdef __SSE__
     59 #include <xmmintrin.h>
     60 #endif
     61 #ifdef __SSE2__
     62 #include <emmintrin.h>
     63 #endif
     64 #endif
     65 
     66 #include "begin_code.h"
     67 /* Set up for C function definitions, even when using C++ */
     68 #ifdef __cplusplus
     69 extern "C" {
     70 #endif
     71 
     72 /* This is a guess for the cacheline size used for padding.
     73  * Most x86 processors have a 64 byte cache line.
     74  * The 64-bit PowerPC processors have a 128 byte cache line.
     75  * We'll use the larger value to be generally safe.
     76  */
     77 #define SDL_CACHELINE_SIZE  128
     78 
     79 /**
     80  *  This function returns the number of CPU cores available.
     81  */
     82 extern DECLSPEC int SDLCALL SDL_GetCPUCount(void);
     83 
     84 /**
     85  *  This function returns the L1 cache line size of the CPU
     86  *
     87  *  This is useful for determining multi-threaded structure padding
     88  *  or SIMD prefetch sizes.
     89  */
     90 extern DECLSPEC int SDLCALL SDL_GetCPUCacheLineSize(void);
     91 
     92 /**
     93  *  This function returns true if the CPU has the RDTSC instruction.
     94  */
     95 extern DECLSPEC SDL_bool SDLCALL SDL_HasRDTSC(void);
     96 
     97 /**
     98  *  This function returns true if the CPU has AltiVec features.
     99  */
    100 extern DECLSPEC SDL_bool SDLCALL SDL_HasAltiVec(void);
    101 
    102 /**
    103  *  This function returns true if the CPU has MMX features.
    104  */
    105 extern DECLSPEC SDL_bool SDLCALL SDL_HasMMX(void);
    106 
    107 /**
    108  *  This function returns true if the CPU has 3DNow! features.
    109  */
    110 extern DECLSPEC SDL_bool SDLCALL SDL_Has3DNow(void);
    111 
    112 /**
    113  *  This function returns true if the CPU has SSE features.
    114  */
    115 extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE(void);
    116 
    117 /**
    118  *  This function returns true if the CPU has SSE2 features.
    119  */
    120 extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE2(void);
    121 
    122 /**
    123  *  This function returns true if the CPU has SSE3 features.
    124  */
    125 extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE3(void);
    126 
    127 /**
    128  *  This function returns true if the CPU has SSE4.1 features.
    129  */
    130 extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE41(void);
    131 
    132 /**
    133  *  This function returns true if the CPU has SSE4.2 features.
    134  */
    135 extern DECLSPEC SDL_bool SDLCALL SDL_HasSSE42(void);
    136 
    137 /**
    138  *  This function returns true if the CPU has AVX features.
    139  */
    140 extern DECLSPEC SDL_bool SDLCALL SDL_HasAVX(void);
    141 
    142 /**
    143  *  This function returns the amount of RAM configured in the system, in MB.
    144  */
    145 extern DECLSPEC int SDLCALL SDL_GetSystemRAM(void);
    146 
    147 
    148 /* Ends C function definitions when using C++ */
    149 #ifdef __cplusplus
    150 }
    151 #endif
    152 #include "close_code.h"
    153 
    154 #endif /* _SDL_cpuinfo_h */
    155 
    156 /* vi: set ts=4 sw=4 expandtab: */
    157