kc3-lang/SDL/src/cpuinfo/SDL_cpuinfo.c

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• Hash : ff5caa17
  Author :
  Date : 2014-08-10T22:21:21
  

  WinRT build fix for ARM platforms The _xgetbv intrinsic was being used in ARM builds of SDL/WinRT, which was leading to linker errors. This commit limits _xgetbv use to the platforms on which it is available, x86 and x64.

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• src/cpuinfo/SDL_cpuinfo.c

• /*
    Simple DirectMedia Layer
    Copyright (C) 1997-2014 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.
  */
  #ifdef TEST_MAIN
  #include "SDL_config.h"
  #else
  #include "../SDL_internal.h"
  #endif
  
  #if defined(__WIN32__)
  #include "../core/windows/SDL_windows.h"
  #endif
  
  /* CPU feature detection for SDL */
  
  #include "SDL_cpuinfo.h"
  
  #ifdef HAVE_SYSCONF
  #include <unistd.h>
  #endif
  #ifdef HAVE_SYSCTLBYNAME
  #include <sys/types.h>
  #include <sys/sysctl.h>
  #endif
  #if defined(__MACOSX__) && (defined(__ppc__) || defined(__ppc64__))
  #include <sys/sysctl.h>         /* For AltiVec check */
  #elif defined(__OpenBSD__) && defined(__powerpc__)
  #include <sys/param.h>
  #include <sys/sysctl.h> /* For AltiVec check */
  #include <machine/cpu.h>
  #elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP
  #include <signal.h>
  #include <setjmp.h>
  #endif
  
  #define CPU_HAS_RDTSC   0x00000001
  #define CPU_HAS_ALTIVEC 0x00000002
  #define CPU_HAS_MMX     0x00000004
  #define CPU_HAS_3DNOW   0x00000008
  #define CPU_HAS_SSE     0x00000010
  #define CPU_HAS_SSE2    0x00000020
  #define CPU_HAS_SSE3    0x00000040
  #define CPU_HAS_SSE41   0x00000100
  #define CPU_HAS_SSE42   0x00000200
  #define CPU_HAS_AVX     0x00000400
  #define CPU_HAS_AVX2    0x00000800
  
  #if SDL_ALTIVEC_BLITTERS && HAVE_SETJMP && !__MACOSX__ && !__OpenBSD__
  /* This is the brute force way of detecting instruction sets...
     the idea is borrowed from the libmpeg2 library - thanks!
   */
  static jmp_buf jmpbuf;
  static void
  illegal_instruction(int sig)
  {
      longjmp(jmpbuf, 1);
  }
  #endif /* HAVE_SETJMP */
  
  static int
  CPU_haveCPUID(void)
  {
      int has_CPUID = 0;
  /* *INDENT-OFF* */
  #if defined(__GNUC__) && defined(i386)
      __asm__ (
  "        pushfl                      # Get original EFLAGS             \n"
  "        popl    %%eax                                                 \n"
  "        movl    %%eax,%%ecx                                           \n"
  "        xorl    $0x200000,%%eax     # Flip ID bit in EFLAGS           \n"
  "        pushl   %%eax               # Save new EFLAGS value on stack  \n"
  "        popfl                       # Replace current EFLAGS value    \n"
  "        pushfl                      # Get new EFLAGS                  \n"
  "        popl    %%eax               # Store new EFLAGS in EAX         \n"
  "        xorl    %%ecx,%%eax         # Can not toggle ID bit,          \n"
  "        jz      1f                  # Processor=80486                 \n"
  "        movl    $1,%0               # We have CPUID support           \n"
  "1:                                                                    \n"
      : "=m" (has_CPUID)
      :
      : "%eax", "%ecx"
      );
  #elif defined(__GNUC__) && defined(__x86_64__)
  /* Technically, if this is being compiled under __x86_64__ then it has 
     CPUid by definition.  But it's nice to be able to prove it.  :)      */
      __asm__ (
  "        pushfq                      # Get original EFLAGS             \n"
  "        popq    %%rax                                                 \n"
  "        movq    %%rax,%%rcx                                           \n"
  "        xorl    $0x200000,%%eax     # Flip ID bit in EFLAGS           \n"
  "        pushq   %%rax               # Save new EFLAGS value on stack  \n"
  "        popfq                       # Replace current EFLAGS value    \n"
  "        pushfq                      # Get new EFLAGS                  \n"
  "        popq    %%rax               # Store new EFLAGS in EAX         \n"
  "        xorl    %%ecx,%%eax         # Can not toggle ID bit,          \n"
  "        jz      1f                  # Processor=80486                 \n"
  "        movl    $1,%0               # We have CPUID support           \n"
  "1:                                                                    \n"
      : "=m" (has_CPUID)
      :
      : "%rax", "%rcx"
      );
  #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
      __asm {
          pushfd                      ; Get original EFLAGS
          pop     eax
          mov     ecx, eax
          xor     eax, 200000h        ; Flip ID bit in EFLAGS
          push    eax                 ; Save new EFLAGS value on stack
          popfd                       ; Replace current EFLAGS value
          pushfd                      ; Get new EFLAGS
          pop     eax                 ; Store new EFLAGS in EAX
          xor     eax, ecx            ; Can not toggle ID bit,
          jz      done                ; Processor=80486
          mov     has_CPUID,1         ; We have CPUID support
  done:
      }
  #elif defined(_MSC_VER) && defined(_M_X64)
      has_CPUID = 1;
  #elif defined(__sun) && defined(__i386)
      __asm (
  "       pushfl                 \n"
  "       popl    %eax           \n"
  "       movl    %eax,%ecx      \n"
  "       xorl    $0x200000,%eax \n"
  "       pushl   %eax           \n"
  "       popfl                  \n"
  "       pushfl                 \n"
  "       popl    %eax           \n"
  "       xorl    %ecx,%eax      \n"
  "       jz      1f             \n"
  "       movl    $1,-8(%ebp)    \n"
  "1:                            \n"
      );
  #elif defined(__sun) && defined(__amd64)
      __asm (
  "       pushfq                 \n"
  "       popq    %rax           \n"
  "       movq    %rax,%rcx      \n"
  "       xorl    $0x200000,%eax \n"
  "       pushq   %rax           \n"
  "       popfq                  \n"
  "       pushfq                 \n"
  "       popq    %rax           \n"
  "       xorl    %ecx,%eax      \n"
  "       jz      1f             \n"
  "       movl    $1,-8(%rbp)    \n"
  "1:                            \n"
      );
  #endif
  /* *INDENT-ON* */
      return has_CPUID;
  }
  
  #if defined(__GNUC__) && defined(i386)
  #define cpuid(func, a, b, c, d) \
      __asm__ __volatile__ ( \
  "        pushl %%ebx        \n" \
  "        xorl %%ecx,%%ecx   \n" \
  "        cpuid              \n" \
  "        movl %%ebx, %%esi  \n" \
  "        popl %%ebx         \n" : \
              "=a" (a), "=S" (b), "=c" (c), "=d" (d) : "a" (func))
  #elif defined(__GNUC__) && defined(__x86_64__)
  #define cpuid(func, a, b, c, d) \
      __asm__ __volatile__ ( \
  "        pushq %%rbx        \n" \
  "        xorq %%rcx,%%rcx   \n" \
  "        cpuid              \n" \
  "        movq %%rbx, %%rsi  \n" \
  "        popq %%rbx         \n" : \
              "=a" (a), "=S" (b), "=c" (c), "=d" (d) : "a" (func))
  #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
  #define cpuid(func, a, b, c, d) \
      __asm { \
          __asm mov eax, func \
          __asm xor ecx, ecx \
          __asm cpuid \
          __asm mov a, eax \
          __asm mov b, ebx \
          __asm mov c, ecx \
          __asm mov d, edx \
  }
  #elif defined(_MSC_VER) && defined(_M_X64)
  #define cpuid(func, a, b, c, d) \
  { \
      int CPUInfo[4]; \
      __cpuid(CPUInfo, func); \
      a = CPUInfo[0]; \
      b = CPUInfo[1]; \
      c = CPUInfo[2]; \
      d = CPUInfo[3]; \
  }
  #else
  #define cpuid(func, a, b, c, d) \
      a = b = c = d = 0
  #endif
  
  static int
  CPU_getCPUIDFeatures(void)
  {
      int features = 0;
      int a, b, c, d;
  
      cpuid(0, a, b, c, d);
      if (a >= 1) {
          cpuid(1, a, b, c, d);
          features = d;
      }
      return features;
  }
  
  static SDL_bool
  CPU_OSSavesYMM(void)
  {
      int a, b, c, d;
  
      /* Check to make sure we can call xgetbv */
      cpuid(0, a, b, c, d);
      if (a < 1) {
          return SDL_FALSE;
      }
      cpuid(1, a, b, c, d);
      if (!(c & 0x08000000)) {
          return SDL_FALSE;
      }
  
      /* Call xgetbv to see if YMM register state is saved */
      a = 0;
  #if defined(__GNUC__) && (defined(i386) || defined(__x86_64__))
      asm(".byte 0x0f, 0x01, 0xd0" : "=a" (a) : "c" (0) : "%edx");
  #elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64)) && (_MSC_FULL_VER >= 160040219) /* VS2010 SP1 */
      a = (int)_xgetbv(0);
  #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
      __asm
      {
          xor ecx, ecx
          _asm _emit 0x0f _asm _emit 0x01 _asm _emit 0xd0
          mov a, eax
      }
  #endif
      return ((a & 6) == 6) ? SDL_TRUE : SDL_FALSE;
  }
  
  static int
  CPU_haveRDTSC(void)
  {
      if (CPU_haveCPUID()) {
          return (CPU_getCPUIDFeatures() & 0x00000010);
      }
      return 0;
  }
  
  static int
  CPU_haveAltiVec(void)
  {
      volatile int altivec = 0;
  #if (defined(__MACOSX__) && (defined(__ppc__) || defined(__ppc64__))) || (defined(__OpenBSD__) && defined(__powerpc__))
  #ifdef __OpenBSD__
      int selectors[2] = { CTL_MACHDEP, CPU_ALTIVEC };
  #else
      int selectors[2] = { CTL_HW, HW_VECTORUNIT };
  #endif
      int hasVectorUnit = 0;
      size_t length = sizeof(hasVectorUnit);
      int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
      if (0 == error)
          altivec = (hasVectorUnit != 0);
  #elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP
      void (*handler) (int sig);
      handler = signal(SIGILL, illegal_instruction);
      if (setjmp(jmpbuf) == 0) {
          asm volatile ("mtspr 256, %0\n\t" "vand %%v0, %%v0, %%v0"::"r" (-1));
          altivec = 1;
      }
      signal(SIGILL, handler);
  #endif
      return altivec;
  }
  
  static int
  CPU_haveMMX(void)
  {
      if (CPU_haveCPUID()) {
          return (CPU_getCPUIDFeatures() & 0x00800000);
      }
      return 0;
  }
  
  static int
  CPU_have3DNow(void)
  {
      if (CPU_haveCPUID()) {
          int a, b, c, d;
  
          cpuid(0x80000000, a, b, c, d);
          if (a >= 0x80000001) {
              cpuid(0x80000001, a, b, c, d);
              return (d & 0x80000000);
          }
      }
      return 0;
  }
  
  static int
  CPU_haveSSE(void)
  {
      if (CPU_haveCPUID()) {
          return (CPU_getCPUIDFeatures() & 0x02000000);
      }
      return 0;
  }
  
  static int
  CPU_haveSSE2(void)
  {
      if (CPU_haveCPUID()) {
          return (CPU_getCPUIDFeatures() & 0x04000000);
      }
      return 0;
  }
  
  static int
  CPU_haveSSE3(void)
  {
      if (CPU_haveCPUID()) {
          int a, b, c, d;
  
          cpuid(0, a, b, c, d);
          if (a >= 1) {
              cpuid(1, a, b, c, d);
              return (c & 0x00000001);
          }
      }
      return 0;
  }
  
  static int
  CPU_haveSSE41(void)
  {
      if (CPU_haveCPUID()) {
          int a, b, c, d;
  
          cpuid(0, a, b, c, d);
          if (a >= 1) {
              cpuid(1, a, b, c, d);
              return (c & 0x00080000);
          }
      }
      return 0;
  }
  
  static int
  CPU_haveSSE42(void)
  {
      if (CPU_haveCPUID()) {
          int a, b, c, d;
  
          cpuid(0, a, b, c, d);
          if (a >= 1) {
              cpuid(1, a, b, c, d);
              return (c & 0x00100000);
          }
      }
      return 0;
  }
  
  static int
  CPU_haveAVX(void)
  {
      if (CPU_haveCPUID() && CPU_OSSavesYMM()) {
          int a, b, c, d;
  
          cpuid(0, a, b, c, d);
          if (a >= 1) {
              cpuid(1, a, b, c, d);
              return (c & 0x10000000);
          }
      }
      return 0;
  }
  
  static int
  CPU_haveAVX2(void)
  {
      if (CPU_haveCPUID() && CPU_OSSavesYMM()) {
          int a, b, c, d;
  
          cpuid(0, a, b, c, d);
          if (a >= 7) {
              cpuid(7, a, b, c, d);
              return (b & 0x00000020);
          }
      }
      return 0;
  }
  
  static int SDL_CPUCount = 0;
  
  int
  SDL_GetCPUCount(void)
  {
      if (!SDL_CPUCount) {
  #if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
          if (SDL_CPUCount <= 0) {
              SDL_CPUCount = (int)sysconf(_SC_NPROCESSORS_ONLN);
          }
  #endif
  #ifdef HAVE_SYSCTLBYNAME
          if (SDL_CPUCount <= 0) {
              size_t size = sizeof(SDL_CPUCount);
              sysctlbyname("hw.ncpu", &SDL_CPUCount, &size, NULL, 0);
          }
  #endif
  #ifdef __WIN32__
          if (SDL_CPUCount <= 0) {
              SYSTEM_INFO info;
              GetSystemInfo(&info);
              SDL_CPUCount = info.dwNumberOfProcessors;
          }
  #endif
          /* There has to be at least 1, right? :) */
          if (SDL_CPUCount <= 0) {
              SDL_CPUCount = 1;
          }
      }
      return SDL_CPUCount;
  }
  
  /* Oh, such a sweet sweet trick, just not very useful. :) */
  static const char *
  SDL_GetCPUType(void)
  {
      static char SDL_CPUType[13];
  
      if (!SDL_CPUType[0]) {
          int i = 0;
          int a, b, c, d;
  
          if (CPU_haveCPUID()) {
              cpuid(0x00000000, a, b, c, d);
              SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
              SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
              SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
              SDL_CPUType[i++] = (char)(b & 0xff);
  
              SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
              SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
              SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
              SDL_CPUType[i++] = (char)(d & 0xff);
  
              SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
              SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
              SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
              SDL_CPUType[i++] = (char)(c & 0xff);
          }
          if (!SDL_CPUType[0]) {
              SDL_strlcpy(SDL_CPUType, "Unknown", sizeof(SDL_CPUType));
          }
      }
      return SDL_CPUType;
  }
  
  
  #ifdef TEST_MAIN  /* !!! FIXME: only used for test at the moment. */
  static const char *
  SDL_GetCPUName(void)
  {
      static char SDL_CPUName[48];
  
      if (!SDL_CPUName[0]) {
          int i = 0;
          int a, b, c, d;
  
          if (CPU_haveCPUID()) {
              cpuid(0x80000000, a, b, c, d);
              if (a >= 0x80000004) {
                  cpuid(0x80000002, a, b, c, d);
                  SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
                  SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
                  SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
                  SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
                  SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
                  SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
                  SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
                  SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
                  SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
                  SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
                  SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
                  SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
                  SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
                  SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
                  SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
                  SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
                  cpuid(0x80000003, a, b, c, d);
                  SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
                  SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
                  SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
                  SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
                  SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
                  SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
                  SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
                  SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
                  SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
                  SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
                  SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
                  SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
                  SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
                  SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
                  SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
                  SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
                  cpuid(0x80000004, a, b, c, d);
                  SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
                  SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
                  SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
                  SDL_CPUName[i++] = (char)(a & 0xff); a >>= 8;
                  SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
                  SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
                  SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
                  SDL_CPUName[i++] = (char)(b & 0xff); b >>= 8;
                  SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
                  SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
                  SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
                  SDL_CPUName[i++] = (char)(c & 0xff); c >>= 8;
                  SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
                  SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
                  SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
                  SDL_CPUName[i++] = (char)(d & 0xff); d >>= 8;
              }
          }
          if (!SDL_CPUName[0]) {
              SDL_strlcpy(SDL_CPUName, "Unknown", sizeof(SDL_CPUName));
          }
      }
      return SDL_CPUName;
  }
  #endif
  
  int
  SDL_GetCPUCacheLineSize(void)
  {
      const char *cpuType = SDL_GetCPUType();
  
      if (SDL_strcmp(cpuType, "GenuineIntel") == 0) {
          int a, b, c, d;
  
          cpuid(0x00000001, a, b, c, d);
          return (((b >> 8) & 0xff) * 8);
      } else if (SDL_strcmp(cpuType, "AuthenticAMD") == 0) {
          int a, b, c, d;
  
          cpuid(0x80000005, a, b, c, d);
          return (c & 0xff);
      } else {
          /* Just make a guess here... */
          return SDL_CACHELINE_SIZE;
      }
  }
  
  static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;
  
  static Uint32
  SDL_GetCPUFeatures(void)
  {
      if (SDL_CPUFeatures == 0xFFFFFFFF) {
          SDL_CPUFeatures = 0;
          if (CPU_haveRDTSC()) {
              SDL_CPUFeatures |= CPU_HAS_RDTSC;
          }
          if (CPU_haveAltiVec()) {
              SDL_CPUFeatures |= CPU_HAS_ALTIVEC;
          }
          if (CPU_haveMMX()) {
              SDL_CPUFeatures |= CPU_HAS_MMX;
          }
          if (CPU_have3DNow()) {
              SDL_CPUFeatures |= CPU_HAS_3DNOW;
          }
          if (CPU_haveSSE()) {
              SDL_CPUFeatures |= CPU_HAS_SSE;
          }
          if (CPU_haveSSE2()) {
              SDL_CPUFeatures |= CPU_HAS_SSE2;
          }
          if (CPU_haveSSE3()) {
              SDL_CPUFeatures |= CPU_HAS_SSE3;
          }
          if (CPU_haveSSE41()) {
              SDL_CPUFeatures |= CPU_HAS_SSE41;
          }
          if (CPU_haveSSE42()) {
              SDL_CPUFeatures |= CPU_HAS_SSE42;
          }
          if (CPU_haveAVX()) {
              SDL_CPUFeatures |= CPU_HAS_AVX;
          }
          if (CPU_haveAVX2()) {
              SDL_CPUFeatures |= CPU_HAS_AVX2;
          }
      }
      return SDL_CPUFeatures;
  }
  
  SDL_bool
  SDL_HasRDTSC(void)
  {
      if (SDL_GetCPUFeatures() & CPU_HAS_RDTSC) {
          return SDL_TRUE;
      }
      return SDL_FALSE;
  }
  
  SDL_bool
  SDL_HasAltiVec(void)
  {
      if (SDL_GetCPUFeatures() & CPU_HAS_ALTIVEC) {
          return SDL_TRUE;
      }
      return SDL_FALSE;
  }
  
  SDL_bool
  SDL_HasMMX(void)
  {
      if (SDL_GetCPUFeatures() & CPU_HAS_MMX) {
          return SDL_TRUE;
      }
      return SDL_FALSE;
  }
  
  SDL_bool
  SDL_Has3DNow(void)
  {
      if (SDL_GetCPUFeatures() & CPU_HAS_3DNOW) {
          return SDL_TRUE;
      }
      return SDL_FALSE;
  }
  
  SDL_bool
  SDL_HasSSE(void)
  {
      if (SDL_GetCPUFeatures() & CPU_HAS_SSE) {
          return SDL_TRUE;
      }
      return SDL_FALSE;
  }
  
  SDL_bool
  SDL_HasSSE2(void)
  {
      if (SDL_GetCPUFeatures() & CPU_HAS_SSE2) {
          return SDL_TRUE;
      }
      return SDL_FALSE;
  }
  
  SDL_bool
  SDL_HasSSE3(void)
  {
      if (SDL_GetCPUFeatures() & CPU_HAS_SSE3) {
          return SDL_TRUE;
      }
      return SDL_FALSE;
  }
  
  SDL_bool
  SDL_HasSSE41(void)
  {
      if (SDL_GetCPUFeatures() & CPU_HAS_SSE41) {
          return SDL_TRUE;
      }
      return SDL_FALSE;
  }
  
  SDL_bool
  SDL_HasSSE42(void)
  {
      if (SDL_GetCPUFeatures() & CPU_HAS_SSE42) {
          return SDL_TRUE;
      }
      return SDL_FALSE;
  }
  
  SDL_bool
  SDL_HasAVX(void)
  {
      if (SDL_GetCPUFeatures() & CPU_HAS_AVX) {
          return SDL_TRUE;
      }
      return SDL_FALSE;
  }
  
  SDL_bool
  SDL_HasAVX2(void)
  {
      if (SDL_GetCPUFeatures() & CPU_HAS_AVX2) {
          return SDL_TRUE;
      }
      return SDL_FALSE;
  }
  
  static int SDL_SystemRAM = 0;
  
  int
  SDL_GetSystemRAM(void)
  {
      if (!SDL_SystemRAM) {
  #if defined(HAVE_SYSCONF) && defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
          if (SDL_SystemRAM <= 0) {
              SDL_SystemRAM = (int)((Sint64)sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE) / (1024*1024));
          }
  #endif
  #ifdef HAVE_SYSCTLBYNAME
          if (SDL_SystemRAM <= 0) {
  #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
  #ifdef HW_REALMEM
              int mib[2] = {CTL_HW, HW_REALMEM};
  #else
              /* might only report up to 2 GiB */
              int mib[2] = {CTL_HW, HW_PHYSMEM};
  #endif /* HW_REALMEM */
  #else
              int mib[2] = {CTL_HW, HW_MEMSIZE};
  #endif /* __FreeBSD__ || __FreeBSD_kernel__ */
              Uint64 memsize = 0;
              size_t len = sizeof(memsize);
              
              if (sysctl(mib, 2, &memsize, &len, NULL, 0) == 0) {
                  SDL_SystemRAM = (int)(memsize / (1024*1024));
              }
          }
  #endif
  #ifdef __WIN32__
          if (SDL_SystemRAM <= 0) {
              MEMORYSTATUSEX stat;
              stat.dwLength = sizeof(stat);
              if (GlobalMemoryStatusEx(&stat)) {
                  SDL_SystemRAM = (int)(stat.ullTotalPhys / (1024 * 1024));
              }
          }
  #endif
      }
      return SDL_SystemRAM;
  }
  
  
  #ifdef TEST_MAIN
  
  #include <stdio.h>
  
  int
  main()
  {
      printf("CPU count: %d\n", SDL_GetCPUCount());
      printf("CPU type: %s\n", SDL_GetCPUType());
      printf("CPU name: %s\n", SDL_GetCPUName());
      printf("CacheLine size: %d\n", SDL_GetCPUCacheLineSize());
      printf("RDTSC: %d\n", SDL_HasRDTSC());
      printf("Altivec: %d\n", SDL_HasAltiVec());
      printf("MMX: %d\n", SDL_HasMMX());
      printf("3DNow: %d\n", SDL_Has3DNow());
      printf("SSE: %d\n", SDL_HasSSE());
      printf("SSE2: %d\n", SDL_HasSSE2());
      printf("SSE3: %d\n", SDL_HasSSE3());
      printf("SSE4.1: %d\n", SDL_HasSSE41());
      printf("SSE4.2: %d\n", SDL_HasSSE42());
      printf("AVX: %d\n", SDL_HasAVX());
      printf("AVX2: %d\n", SDL_HasAVX2());
      printf("RAM: %d MB\n", SDL_GetSystemRAM());
      return 0;
  }
  
  #endif /* TEST_MAIN */
  
  /* vi: set ts=4 sw=4 expandtab: */
  

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