SDL  2.0
SDL_cpuinfo.h File Reference
#include "SDL_stdinc.h"
#include "begin_code.h"
#include "close_code.h"
+ Include dependency graph for SDL_cpuinfo.h:
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Go to the source code of this file.

Macros

#define SDL_CACHELINE_SIZE   128
 

Functions

int SDL_GetCPUCount (void)
 
int SDL_GetCPUCacheLineSize (void)
 
SDL_bool SDL_HasRDTSC (void)
 
SDL_bool SDL_HasAltiVec (void)
 
SDL_bool SDL_HasMMX (void)
 
SDL_bool SDL_Has3DNow (void)
 
SDL_bool SDL_HasSSE (void)
 
SDL_bool SDL_HasSSE2 (void)
 
SDL_bool SDL_HasSSE3 (void)
 
SDL_bool SDL_HasSSE41 (void)
 
SDL_bool SDL_HasSSE42 (void)
 
SDL_bool SDL_HasAVX (void)
 
SDL_bool SDL_HasAVX2 (void)
 
int SDL_GetSystemRAM (void)
 

Detailed Description

CPU feature detection for SDL.

Definition in file SDL_cpuinfo.h.

Macro Definition Documentation

◆ SDL_CACHELINE_SIZE

#define SDL_CACHELINE_SIZE   128

Definition at line 77 of file SDL_cpuinfo.h.

Referenced by SDL_GetCPUCacheLineSize().

Function Documentation

◆ SDL_GetCPUCacheLineSize()

int SDL_GetCPUCacheLineSize ( void  )

This function returns the L1 cache line size of the CPU

This is useful for determining multi-threaded structure padding or SIMD prefetch sizes.

Definition at line 564 of file SDL_cpuinfo.c.

References cpuid, d, SDL_CACHELINE_SIZE, SDL_GetCPUType(), SDL_strcmp, and void.

Referenced by SDL_GetSystemRAM().

565 {
566  const char *cpuType = SDL_GetCPUType();
567  int a, b, c, d;
568  (void) a; (void) b; (void) c; (void) d;
569  if (SDL_strcmp(cpuType, "GenuineIntel") == 0) {
570  cpuid(0x00000001, a, b, c, d);
571  return (((b >> 8) & 0xff) * 8);
572  } else if (SDL_strcmp(cpuType, "AuthenticAMD") == 0) {
573  cpuid(0x80000005, a, b, c, d);
574  return (c & 0xff);
575  } else {
576  /* Just make a guess here... */
577  return SDL_CACHELINE_SIZE;
578  }
579 }
static const char * SDL_GetCPUType(void)
Definition: SDL_cpuinfo.c:455
SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char const char SDL_SCANF_FORMAT_STRING const char return SDL_ThreadFunction const char void return Uint32 return Uint32 SDL_AssertionHandler void SDL_SpinLock SDL_atomic_t int int return SDL_atomic_t return void void void return void return int return SDL_AudioSpec SDL_AudioSpec return int int return return int SDL_RWops int SDL_AudioSpec Uint8 ** d
#define SDL_CACHELINE_SIZE
Definition: SDL_cpuinfo.h:77
const GLubyte * c
#define cpuid(func, a, b, c, d)
Definition: SDL_cpuinfo.c:214
SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char int SDL_PRINTF_FORMAT_STRING const char const char SDL_SCANF_FORMAT_STRING const char return SDL_ThreadFunction const char void return Uint32 return Uint32 void
#define SDL_strcmp
GLboolean GLboolean GLboolean GLboolean a
GLboolean GLboolean GLboolean b

◆ SDL_GetCPUCount()

int SDL_GetCPUCount ( void  )

This function returns the number of CPU cores available.

Definition at line 422 of file SDL_cpuinfo.c.

References NULL, and SDL_CPUCount.

Referenced by SDL_GetSystemRAM().

423 {
424  if (!SDL_CPUCount) {
425 #ifndef SDL_CPUINFO_DISABLED
426 #if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
427  if (SDL_CPUCount <= 0) {
428  SDL_CPUCount = (int)sysconf(_SC_NPROCESSORS_ONLN);
429  }
430 #endif
431 #ifdef HAVE_SYSCTLBYNAME
432  if (SDL_CPUCount <= 0) {
433  size_t size = sizeof(SDL_CPUCount);
434  sysctlbyname("hw.ncpu", &SDL_CPUCount, &size, NULL, 0);
435  }
436 #endif
437 #ifdef __WIN32__
438  if (SDL_CPUCount <= 0) {
439  SYSTEM_INFO info;
440  GetSystemInfo(&info);
441  SDL_CPUCount = info.dwNumberOfProcessors;
442  }
443 #endif
444 #endif
445  /* There has to be at least 1, right? :) */
446  if (SDL_CPUCount <= 0) {
447  SDL_CPUCount = 1;
448  }
449  }
450  return SDL_CPUCount;
451 }
GLsizeiptr size
#define NULL
Definition: begin_code.h:143
static int SDL_CPUCount
Definition: SDL_cpuinfo.c:419

◆ SDL_GetSystemRAM()

int SDL_GetSystemRAM ( void  )

This function returns the amount of RAM configured in the system, in MB.

Definition at line 727 of file SDL_cpuinfo.c.

References main, NULL, SDL_GetCPUCacheLineSize(), SDL_GetCPUCount(), SDL_GetCPUType(), SDL_Has3DNow(), SDL_HasAltiVec(), SDL_HasAVX(), SDL_HasAVX2(), SDL_HasMMX(), SDL_HasRDTSC(), SDL_HasSSE(), SDL_HasSSE2(), SDL_HasSSE3(), SDL_HasSSE41(), SDL_HasSSE42(), and SDL_SystemRAM.

728 {
729  if (!SDL_SystemRAM) {
730 #ifndef SDL_CPUINFO_DISABLED
731 #if defined(HAVE_SYSCONF) && defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
732  if (SDL_SystemRAM <= 0) {
733  SDL_SystemRAM = (int)((Sint64)sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE) / (1024*1024));
734  }
735 #endif
736 #ifdef HAVE_SYSCTLBYNAME
737  if (SDL_SystemRAM <= 0) {
738 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__)
739 #ifdef HW_REALMEM
740  int mib[2] = {CTL_HW, HW_REALMEM};
741 #else
742  /* might only report up to 2 GiB */
743  int mib[2] = {CTL_HW, HW_PHYSMEM};
744 #endif /* HW_REALMEM */
745 #else
746  int mib[2] = {CTL_HW, HW_MEMSIZE};
747 #endif /* __FreeBSD__ || __FreeBSD_kernel__ */
748  Uint64 memsize = 0;
749  size_t len = sizeof(memsize);
750 
751  if (sysctl(mib, 2, &memsize, &len, NULL, 0) == 0) {
752  SDL_SystemRAM = (int)(memsize / (1024*1024));
753  }
754  }
755 #endif
756 #ifdef __WIN32__
757  if (SDL_SystemRAM <= 0) {
758  MEMORYSTATUSEX stat;
759  stat.dwLength = sizeof(stat);
760  if (GlobalMemoryStatusEx(&stat)) {
761  SDL_SystemRAM = (int)(stat.ullTotalPhys / (1024 * 1024));
762  }
763  }
764 #endif
765 #endif
766  }
767  return SDL_SystemRAM;
768 }
static int SDL_SystemRAM
Definition: SDL_cpuinfo.c:724
uint64_t Uint64
An unsigned 64-bit integer type.
Definition: SDL_stdinc.h:168
GLenum GLsizei len
#define NULL
Definition: begin_code.h:143
int64_t Sint64
A signed 64-bit integer type.
Definition: SDL_stdinc.h:164

◆ SDL_Has3DNow()

SDL_bool SDL_Has3DNow ( void  )

This function returns true if the CPU has 3DNow! features.

Definition at line 653 of file SDL_cpuinfo.c.

References CPU_HAS_3DNOW, SDL_FALSE, SDL_GetCPUFeatures(), and SDL_TRUE.

Referenced by SDL_GetSystemRAM().

654 {
656  return SDL_TRUE;
657  }
658  return SDL_FALSE;
659 }
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:584
#define CPU_HAS_3DNOW
Definition: SDL_cpuinfo.c:56

◆ SDL_HasAltiVec()

SDL_bool SDL_HasAltiVec ( void  )

This function returns true if the CPU has AltiVec features.

Definition at line 635 of file SDL_cpuinfo.c.

References CPU_HAS_ALTIVEC, SDL_FALSE, SDL_GetCPUFeatures(), and SDL_TRUE.

Referenced by SDL_GetSystemRAM().

636 {
638  return SDL_TRUE;
639  }
640  return SDL_FALSE;
641 }
#define CPU_HAS_ALTIVEC
Definition: SDL_cpuinfo.c:54
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:584

◆ SDL_HasAVX()

SDL_bool SDL_HasAVX ( void  )

This function returns true if the CPU has AVX features.

Definition at line 707 of file SDL_cpuinfo.c.

References CPU_HAS_AVX, SDL_FALSE, SDL_GetCPUFeatures(), and SDL_TRUE.

Referenced by SDL_GetSystemRAM().

708 {
710  return SDL_TRUE;
711  }
712  return SDL_FALSE;
713 }
#define CPU_HAS_AVX
Definition: SDL_cpuinfo.c:62
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:584

◆ SDL_HasAVX2()

SDL_bool SDL_HasAVX2 ( void  )

This function returns true if the CPU has AVX2 features.

Definition at line 716 of file SDL_cpuinfo.c.

References CPU_HAS_AVX2, SDL_FALSE, SDL_GetCPUFeatures(), and SDL_TRUE.

Referenced by SDL_GetSystemRAM().

717 {
719  return SDL_TRUE;
720  }
721  return SDL_FALSE;
722 }
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:584
#define CPU_HAS_AVX2
Definition: SDL_cpuinfo.c:63

◆ SDL_HasMMX()

SDL_bool SDL_HasMMX ( void  )

This function returns true if the CPU has MMX features.

Definition at line 644 of file SDL_cpuinfo.c.

References CPU_HAS_MMX, SDL_FALSE, SDL_GetCPUFeatures(), and SDL_TRUE.

Referenced by SDL_GetSystemRAM().

645 {
647  return SDL_TRUE;
648  }
649  return SDL_FALSE;
650 }
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:584
#define CPU_HAS_MMX
Definition: SDL_cpuinfo.c:55

◆ SDL_HasRDTSC()

SDL_bool SDL_HasRDTSC ( void  )

This function returns true if the CPU has the RDTSC instruction.

Definition at line 626 of file SDL_cpuinfo.c.

References CPU_HAS_RDTSC, SDL_FALSE, SDL_GetCPUFeatures(), and SDL_TRUE.

Referenced by SDL_GetSystemRAM().

627 {
629  return SDL_TRUE;
630  }
631  return SDL_FALSE;
632 }
#define CPU_HAS_RDTSC
Definition: SDL_cpuinfo.c:53
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:584

◆ SDL_HasSSE()

SDL_bool SDL_HasSSE ( void  )

This function returns true if the CPU has SSE features.

Definition at line 662 of file SDL_cpuinfo.c.

References CPU_HAS_SSE, SDL_FALSE, SDL_GetCPUFeatures(), and SDL_TRUE.

Referenced by SDL_GetSystemRAM().

663 {
665  return SDL_TRUE;
666  }
667  return SDL_FALSE;
668 }
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:584
#define CPU_HAS_SSE
Definition: SDL_cpuinfo.c:57

◆ SDL_HasSSE2()

SDL_bool SDL_HasSSE2 ( void  )

This function returns true if the CPU has SSE2 features.

Definition at line 671 of file SDL_cpuinfo.c.

References CPU_HAS_SSE2, SDL_FALSE, SDL_GetCPUFeatures(), and SDL_TRUE.

Referenced by SDL_GetSystemRAM().

672 {
674  return SDL_TRUE;
675  }
676  return SDL_FALSE;
677 }
#define CPU_HAS_SSE2
Definition: SDL_cpuinfo.c:58
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:584

◆ SDL_HasSSE3()

SDL_bool SDL_HasSSE3 ( void  )

This function returns true if the CPU has SSE3 features.

Definition at line 680 of file SDL_cpuinfo.c.

References CPU_HAS_SSE3, SDL_FALSE, SDL_GetCPUFeatures(), and SDL_TRUE.

Referenced by SDL_GetSystemRAM().

681 {
683  return SDL_TRUE;
684  }
685  return SDL_FALSE;
686 }
#define CPU_HAS_SSE3
Definition: SDL_cpuinfo.c:59
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:584

◆ SDL_HasSSE41()

SDL_bool SDL_HasSSE41 ( void  )

This function returns true if the CPU has SSE4.1 features.

Definition at line 689 of file SDL_cpuinfo.c.

References CPU_HAS_SSE41, SDL_FALSE, SDL_GetCPUFeatures(), and SDL_TRUE.

Referenced by SDL_GetSystemRAM().

690 {
692  return SDL_TRUE;
693  }
694  return SDL_FALSE;
695 }
#define CPU_HAS_SSE41
Definition: SDL_cpuinfo.c:60
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:584

◆ SDL_HasSSE42()

SDL_bool SDL_HasSSE42 ( void  )

This function returns true if the CPU has SSE4.2 features.

Definition at line 698 of file SDL_cpuinfo.c.

References CPU_HAS_SSE42, SDL_FALSE, SDL_GetCPUFeatures(), and SDL_TRUE.

Referenced by SDL_GetSystemRAM().

699 {
701  return SDL_TRUE;
702  }
703  return SDL_FALSE;
704 }
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:584
#define CPU_HAS_SSE42
Definition: SDL_cpuinfo.c:61