SDL  2.0
SDL_cpuinfo.c File Reference
#include "../SDL_internal.h"
#include "SDL_simd.h"
#include "SDL_cpuinfo.h"
#include "SDL_assert.h"
+ Include dependency graph for SDL_cpuinfo.c:

Go to the source code of this file.

Macros

#define CPU_HAS_RDTSC   (1 << 0)
 
#define CPU_HAS_ALTIVEC   (1 << 1)
 
#define CPU_HAS_MMX   (1 << 2)
 
#define CPU_HAS_3DNOW   (1 << 3)
 
#define CPU_HAS_SSE   (1 << 4)
 
#define CPU_HAS_SSE2   (1 << 5)
 
#define CPU_HAS_SSE3   (1 << 6)
 
#define CPU_HAS_SSE41   (1 << 7)
 
#define CPU_HAS_SSE42   (1 << 8)
 
#define CPU_HAS_AVX   (1 << 9)
 
#define CPU_HAS_AVX2   (1 << 10)
 
#define CPU_HAS_NEON   (1 << 11)
 
#define CPU_HAS_AVX512F   (1 << 12)
 
#define CPU_HAS_ARM_SIMD   (1 << 13)
 
#define cpuid(func, a, b, c, d)   do { a = b = c = d = 0; (void) a; (void) b; (void) c; (void) d; } while (0)
 
#define CPU_haveRDTSC()   (CPU_CPUIDFeatures[3] & 0x00000010)
 
#define CPU_haveMMX()   (CPU_CPUIDFeatures[3] & 0x00800000)
 
#define CPU_haveSSE()   (CPU_CPUIDFeatures[3] & 0x02000000)
 
#define CPU_haveSSE2()   (CPU_CPUIDFeatures[3] & 0x04000000)
 
#define CPU_haveSSE3()   (CPU_CPUIDFeatures[2] & 0x00000001)
 
#define CPU_haveSSE41()   (CPU_CPUIDFeatures[2] & 0x00080000)
 
#define CPU_haveSSE42()   (CPU_CPUIDFeatures[2] & 0x00100000)
 
#define CPU_haveAVX()   (CPU_OSSavesYMM && (CPU_CPUIDFeatures[2] & 0x10000000))
 
#define CPU_FEATURE_AVAILABLE(f)   ((SDL_GetCPUFeatures() & f) ? SDL_TRUE : SDL_FALSE)
 

Functions

static int CPU_haveCPUID (void)
 
static void CPU_calcCPUIDFeatures (void)
 
static int CPU_haveAltiVec (void)
 
static SDL_bool CPU_haveARMSIMD (void)
 
static int CPU_haveNEON (void)
 
static int CPU_have3DNow (void)
 
static int CPU_haveAVX2 (void)
 
static int CPU_haveAVX512F (void)
 
int SDL_GetCPUCount (void)
 
static const char * SDL_GetCPUType (void)
 
int SDL_GetCPUCacheLineSize (void)
 
static Uint32 SDL_GetCPUFeatures (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)
 
SDL_bool SDL_HasAVX512F (void)
 
SDL_bool SDL_HasARMSIMD (void)
 
SDL_bool SDL_HasNEON (void)
 
int SDL_GetSystemRAM (void)
 
size_t SDL_SIMDGetAlignment (void)
 Report the alignment this system needs for SIMD allocations. More...
 
voidSDL_SIMDAlloc (const size_t len)
 Allocate memory in a SIMD-friendly way. More...
 
void SDL_SIMDFree (void *ptr)
 Deallocate memory obtained from SDL_SIMDAlloc. More...
 

Variables

static int CPU_CPUIDFeatures [4]
 
static int CPU_CPUIDMaxFunction = 0
 
static SDL_bool CPU_OSSavesYMM = SDL_FALSE
 
static SDL_bool CPU_OSSavesZMM = SDL_FALSE
 
static int SDL_CPUCount = 0
 
static Uint32 SDL_CPUFeatures = 0xFFFFFFFF
 
static Uint32 SDL_SIMDAlignment = 0xFFFFFFFF
 
static int SDL_SystemRAM = 0
 

Macro Definition Documentation

◆ CPU_FEATURE_AVAILABLE

◆ CPU_HAS_3DNOW

#define CPU_HAS_3DNOW   (1 << 3)

Definition at line 84 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_Has3DNow().

◆ CPU_HAS_ALTIVEC

#define CPU_HAS_ALTIVEC   (1 << 1)

Definition at line 82 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasAltiVec().

◆ CPU_HAS_ARM_SIMD

#define CPU_HAS_ARM_SIMD   (1 << 13)

Definition at line 94 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasARMSIMD().

◆ CPU_HAS_AVX

#define CPU_HAS_AVX   (1 << 9)

Definition at line 90 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasAVX().

◆ CPU_HAS_AVX2

#define CPU_HAS_AVX2   (1 << 10)

Definition at line 91 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasAVX2().

◆ CPU_HAS_AVX512F

#define CPU_HAS_AVX512F   (1 << 12)

Definition at line 93 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasAVX512F().

◆ CPU_HAS_MMX

#define CPU_HAS_MMX   (1 << 2)

Definition at line 83 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasMMX().

◆ CPU_HAS_NEON

#define CPU_HAS_NEON   (1 << 11)

Definition at line 92 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasNEON().

◆ CPU_HAS_RDTSC

#define CPU_HAS_RDTSC   (1 << 0)

Definition at line 81 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasRDTSC().

◆ CPU_HAS_SSE

#define CPU_HAS_SSE   (1 << 4)

Definition at line 85 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasSSE().

◆ CPU_HAS_SSE2

#define CPU_HAS_SSE2   (1 << 5)

Definition at line 86 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasSSE2().

◆ CPU_HAS_SSE3

#define CPU_HAS_SSE3   (1 << 6)

Definition at line 87 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasSSE3().

◆ CPU_HAS_SSE41

#define CPU_HAS_SSE41   (1 << 7)

Definition at line 88 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasSSE41().

◆ CPU_HAS_SSE42

#define CPU_HAS_SSE42   (1 << 8)

Definition at line 89 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_HasSSE42().

◆ CPU_haveAVX

#define CPU_haveAVX ( )    (CPU_OSSavesYMM && (CPU_CPUIDFeatures[2] & 0x10000000))

Definition at line 438 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures().

◆ CPU_haveMMX

#define CPU_haveMMX ( )    (CPU_CPUIDFeatures[3] & 0x00800000)

Definition at line 432 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures().

◆ CPU_haveRDTSC

#define CPU_haveRDTSC ( )    (CPU_CPUIDFeatures[3] & 0x00000010)

Definition at line 431 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures().

◆ CPU_haveSSE

#define CPU_haveSSE ( )    (CPU_CPUIDFeatures[3] & 0x02000000)

Definition at line 433 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures().

◆ CPU_haveSSE2

#define CPU_haveSSE2 ( )    (CPU_CPUIDFeatures[3] & 0x04000000)

Definition at line 434 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures().

◆ CPU_haveSSE3

#define CPU_haveSSE3 ( )    (CPU_CPUIDFeatures[2] & 0x00000001)

Definition at line 435 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures().

◆ CPU_haveSSE41

#define CPU_haveSSE41 ( )    (CPU_CPUIDFeatures[2] & 0x00080000)

Definition at line 436 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures().

◆ CPU_haveSSE42

#define CPU_haveSSE42 ( )    (CPU_CPUIDFeatures[2] & 0x00100000)

Definition at line 437 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures().

◆ cpuid

#define cpuid (   func,
  a,
  b,
  c,
  d 
)    do { a = b = c = d = 0; (void) a; (void) b; (void) c; (void) d; } while (0)

Function Documentation

◆ CPU_calcCPUIDFeatures()

static void CPU_calcCPUIDFeatures ( void  )
static

Definition at line 256 of file SDL_cpuinfo.c.

References CPU_CPUIDFeatures, CPU_CPUIDMaxFunction, CPU_haveCPUID(), CPU_OSSavesYMM, CPU_OSSavesZMM, cpuid, d, mov, SDL_FALSE, and SDL_TRUE.

Referenced by SDL_GetCPUFeatures(), and SDL_GetCPUType().

257 {
258  static SDL_bool checked = SDL_FALSE;
259  if (!checked) {
260  checked = SDL_TRUE;
261  if (CPU_haveCPUID()) {
262  int a, b, c, d;
263  cpuid(0, a, b, c, d);
265  if (CPU_CPUIDMaxFunction >= 1) {
266  cpuid(1, a, b, c, d);
267  CPU_CPUIDFeatures[0] = a;
268  CPU_CPUIDFeatures[1] = b;
269  CPU_CPUIDFeatures[2] = c;
270  CPU_CPUIDFeatures[3] = d;
271 
272  /* Check to make sure we can call xgetbv */
273  if (c & 0x08000000) {
274  /* Call xgetbv to see if YMM (etc) register state is saved */
275 #if defined(__GNUC__) && (defined(i386) || defined(__x86_64__))
276  __asm__(".byte 0x0f, 0x01, 0xd0" : "=a" (a) : "c" (0) : "%edx");
277 #elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64)) && (_MSC_FULL_VER >= 160040219) /* VS2010 SP1 */
278  a = (int)_xgetbv(0);
279 #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
280  __asm
281  {
282  xor ecx, ecx
283  _asm _emit 0x0f _asm _emit 0x01 _asm _emit 0xd0
284  mov a, eax
285  }
286 #endif
287  CPU_OSSavesYMM = ((a & 6) == 6) ? SDL_TRUE : SDL_FALSE;
288  CPU_OSSavesZMM = (CPU_OSSavesYMM && ((a & 0xe0) == 0xe0)) ? SDL_TRUE : SDL_FALSE;
289  }
290  }
291  }
292  }
293 }
static SDL_bool CPU_OSSavesYMM
Definition: SDL_cpuinfo.c:252
static int CPU_CPUIDMaxFunction
Definition: SDL_cpuinfo.c:251
static int CPU_haveCPUID(void)
Definition: SDL_cpuinfo.c:109
static SDL_bool CPU_OSSavesZMM
Definition: SDL_cpuinfo.c:253
set set set set set set set set set set set set set set set set set set set set *set set set macro pixldst op &r &cond WK op &r &cond WK op &r &cond WK else op &m &cond &ia op &r &cond WK else op &m &cond &ia elseif elseif else error unsupported base if elseif elseif else error unsupported unaligned pixldst unaligned endm macro pixst base base else pixldst base endif endm macro PF base if bpp PF set rept prefetch_distance PF set OFFSET endr endif endm macro preload_leading_step2 base if bpp ifc DST PF PF else if bpp lsl PF PF lsl PF PF lsl PF PF PF else PF mov
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
const GLubyte * c
#define cpuid(func, a, b, c, d)
Definition: SDL_cpuinfo.c:246
SDL_bool
Definition: SDL_stdinc.h:161
static int CPU_CPUIDFeatures[4]
Definition: SDL_cpuinfo.c:250
GLboolean GLboolean GLboolean GLboolean a
GLboolean GLboolean GLboolean b

◆ CPU_have3DNow()

static int CPU_have3DNow ( void  )
static

Definition at line 418 of file SDL_cpuinfo.c.

References CPU_CPUIDMaxFunction, cpuid, and d.

Referenced by SDL_GetCPUFeatures().

419 {
420  if (CPU_CPUIDMaxFunction > 0) { /* that is, do we have CPUID at all? */
421  int a, b, c, d;
422  cpuid(0x80000000, a, b, c, d);
423  if (a >= 0x80000001) {
424  cpuid(0x80000001, a, b, c, d);
425  return (d & 0x80000000);
426  }
427  }
428  return 0;
429 }
static int CPU_CPUIDMaxFunction
Definition: SDL_cpuinfo.c:251
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
const GLubyte * c
#define cpuid(func, a, b, c, d)
Definition: SDL_cpuinfo.c:246
GLboolean GLboolean GLboolean GLboolean a
GLboolean GLboolean GLboolean b

◆ CPU_haveAltiVec()

static int CPU_haveAltiVec ( void  )
static

Definition at line 296 of file SDL_cpuinfo.c.

References CPU_haveARMSIMD(), NULL, and void.

Referenced by SDL_GetCPUFeatures().

297 {
298  volatile int altivec = 0;
299 #ifndef SDL_CPUINFO_DISABLED
300 #if (defined(__MACOSX__) && (defined(__ppc__) || defined(__ppc64__))) || (defined(__OpenBSD__) && defined(__powerpc__))
301 #ifdef __OpenBSD__
302  int selectors[2] = { CTL_MACHDEP, CPU_ALTIVEC };
303 #else
304  int selectors[2] = { CTL_HW, HW_VECTORUNIT };
305 #endif
306  int hasVectorUnit = 0;
307  size_t length = sizeof(hasVectorUnit);
308  int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
309  if (0 == error)
310  altivec = (hasVectorUnit != 0);
311 #elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP
312  void (*handler) (int sig);
313  handler = signal(SIGILL, illegal_instruction);
314  if (setjmp(jmpbuf) == 0) {
315  asm volatile ("mtspr 256, %0\n\t" "vand %%v0, %%v0, %%v0"::"r" (-1));
316  altivec = 1;
317  }
318  signal(SIGILL, handler);
319 #endif
320 #endif
321  return altivec;
322 }
#define NULL
Definition: begin_code.h:164
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
GLuint GLsizei GLsizei * length

◆ CPU_haveARMSIMD()

static SDL_bool CPU_haveARMSIMD ( void  )
static

Definition at line 359 of file SDL_cpuinfo.c.

Referenced by CPU_haveAltiVec(), and SDL_GetCPUFeatures().

360 {
361 #warning SDL_HasARMSIMD is not implemented for this ARM platform. Write me.
362  return 0;
363 }

◆ CPU_haveAVX2()

static int CPU_haveAVX2 ( void  )
static

Definition at line 441 of file SDL_cpuinfo.c.

References CPU_CPUIDMaxFunction, CPU_OSSavesYMM, cpuid, d, and void.

Referenced by SDL_GetCPUFeatures().

442 {
443  if (CPU_OSSavesYMM && (CPU_CPUIDMaxFunction >= 7)) {
444  int a, b, c, d;
445  (void) a; (void) b; (void) c; (void) d; /* compiler warnings... */
446  cpuid(7, a, b, c, d);
447  return (b & 0x00000020);
448  }
449  return 0;
450 }
static SDL_bool CPU_OSSavesYMM
Definition: SDL_cpuinfo.c:252
static int CPU_CPUIDMaxFunction
Definition: SDL_cpuinfo.c:251
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
const GLubyte * c
#define cpuid(func, a, b, c, d)
Definition: SDL_cpuinfo.c:246
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
GLboolean GLboolean GLboolean GLboolean a
GLboolean GLboolean GLboolean b

◆ CPU_haveAVX512F()

static int CPU_haveAVX512F ( void  )
static

Definition at line 453 of file SDL_cpuinfo.c.

References CPU_CPUIDMaxFunction, CPU_OSSavesZMM, cpuid, d, and void.

Referenced by SDL_GetCPUFeatures().

454 {
455  if (CPU_OSSavesZMM && (CPU_CPUIDMaxFunction >= 7)) {
456  int a, b, c, d;
457  (void) a; (void) b; (void) c; (void) d; /* compiler warnings... */
458  cpuid(7, a, b, c, d);
459  return (b & 0x00010000);
460  }
461  return 0;
462 }
static int CPU_CPUIDMaxFunction
Definition: SDL_cpuinfo.c:251
static SDL_bool CPU_OSSavesZMM
Definition: SDL_cpuinfo.c:253
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
const GLubyte * c
#define cpuid(func, a, b, c, d)
Definition: SDL_cpuinfo.c:246
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
GLboolean GLboolean GLboolean GLboolean a
GLboolean GLboolean GLboolean b

◆ CPU_haveCPUID()

static int CPU_haveCPUID ( void  )
static

Definition at line 109 of file SDL_cpuinfo.c.

References done, mov, and pop.

Referenced by CPU_calcCPUIDFeatures().

110 {
111  int has_CPUID = 0;
112 
113 /* *INDENT-OFF* */
114 #ifndef SDL_CPUINFO_DISABLED
115 #if defined(__GNUC__) && defined(i386)
116  __asm__ (
117 " pushfl # Get original EFLAGS \n"
118 " popl %%eax \n"
119 " movl %%eax,%%ecx \n"
120 " xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n"
121 " pushl %%eax # Save new EFLAGS value on stack \n"
122 " popfl # Replace current EFLAGS value \n"
123 " pushfl # Get new EFLAGS \n"
124 " popl %%eax # Store new EFLAGS in EAX \n"
125 " xorl %%ecx,%%eax # Can not toggle ID bit, \n"
126 " jz 1f # Processor=80486 \n"
127 " movl $1,%0 # We have CPUID support \n"
128 "1: \n"
129  : "=m" (has_CPUID)
130  :
131  : "%eax", "%ecx"
132  );
133 #elif defined(__GNUC__) && defined(__x86_64__)
134 /* Technically, if this is being compiled under __x86_64__ then it has
135  CPUid by definition. But it's nice to be able to prove it. :) */
136  __asm__ (
137 " pushfq # Get original EFLAGS \n"
138 " popq %%rax \n"
139 " movq %%rax,%%rcx \n"
140 " xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n"
141 " pushq %%rax # Save new EFLAGS value on stack \n"
142 " popfq # Replace current EFLAGS value \n"
143 " pushfq # Get new EFLAGS \n"
144 " popq %%rax # Store new EFLAGS in EAX \n"
145 " xorl %%ecx,%%eax # Can not toggle ID bit, \n"
146 " jz 1f # Processor=80486 \n"
147 " movl $1,%0 # We have CPUID support \n"
148 "1: \n"
149  : "=m" (has_CPUID)
150  :
151  : "%rax", "%rcx"
152  );
153 #elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
154  __asm {
155  pushfd ; Get original EFLAGS
156  pop eax
157  mov ecx, eax
158  xor eax, 200000h ; Flip ID bit in EFLAGS
159  push eax ; Save new EFLAGS value on stack
160  popfd ; Replace current EFLAGS value
161  pushfd ; Get new EFLAGS
162  pop eax ; Store new EFLAGS in EAX
163  xor eax, ecx ; Can not toggle ID bit,
164  jz done ; Processor=80486
165  mov has_CPUID,1 ; We have CPUID support
166 done:
167  }
168 #elif defined(_MSC_VER) && defined(_M_X64)
169  has_CPUID = 1;
170 #elif defined(__sun) && defined(__i386)
171  __asm (
172 " pushfl \n"
173 " popl %eax \n"
174 " movl %eax,%ecx \n"
175 " xorl $0x200000,%eax \n"
176 " pushl %eax \n"
177 " popfl \n"
178 " pushfl \n"
179 " popl %eax \n"
180 " xorl %ecx,%eax \n"
181 " jz 1f \n"
182 " movl $1,-8(%ebp) \n"
183 "1: \n"
184  );
185 #elif defined(__sun) && defined(__amd64)
186  __asm (
187 " pushfq \n"
188 " popq %rax \n"
189 " movq %rax,%rcx \n"
190 " xorl $0x200000,%eax \n"
191 " pushq %rax \n"
192 " popfq \n"
193 " pushfq \n"
194 " popq %rax \n"
195 " xorl %ecx,%eax \n"
196 " jz 1f \n"
197 " movl $1,-8(%rbp) \n"
198 "1: \n"
199  );
200 #endif
201 #endif
202 /* *INDENT-ON* */
203  return has_CPUID;
204 }
GLfloat GLfloat GLfloat GLfloat h
set set set set set set set set set set set set set set set set set set set set *set set set macro pixldst op &r &cond WK op &r &cond WK op &r &cond WK else op &m &cond &ia op &r &cond WK else op &m &cond &ia elseif elseif else error unsupported base if elseif elseif else error unsupported unaligned pixldst unaligned endm macro pixst base base else pixldst base endif endm macro PF base if bpp PF set rept prefetch_distance PF set OFFSET endr endif endm macro preload_leading_step2 base if bpp ifc DST PF PF else if bpp lsl PF PF lsl PF PF lsl PF PF PF else PF mov
#define pop
Definition: SDL_qsort.c:192
int done
Definition: checkkeys.c:28
GLsizei const GLfloat * value
GLuint in

◆ CPU_haveNEON()

static int CPU_haveNEON ( void  )
static

Definition at line 389 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures().

390 {
391 /* The way you detect NEON is a privileged instruction on ARM, so you have
392  query the OS kernel in a platform-specific way. :/ */
393 #if defined(SDL_CPUINFO_DISABLED) || !defined(__ARM_ARCH)
394  return 0; /* disabled or not an ARM CPU at all. */
395 #elif __ARM_ARCH >= 8
396  return 1; /* ARMv8 always has non-optional NEON support. */
397 #elif defined(__APPLE__) && (__ARM_ARCH >= 7)
398  /* (note that sysctlbyname("hw.optional.neon") doesn't work!) */
399  return 1; /* all Apple ARMv7 chips and later have NEON. */
400 #elif defined(__APPLE__)
401  return 0; /* assume anything else from Apple doesn't have NEON. */
402 #elif defined(__QNXNTO__)
403  return SYSPAGE_ENTRY(cpuinfo)->flags & ARM_CPU_FLAG_NEON;
404 #elif (defined(__LINUX__) || defined(__ANDROID__)) && defined(HAVE_GETAUXVAL)
405  return ((getauxval(AT_HWCAP) & HWCAP_NEON) == HWCAP_NEON);
406 #elif (defined(__LINUX__) || defined(__ANDROID__))
407  return readProcAuxvForNeon(); /* Android offers a static library for this, but it just parses /proc/self/auxv */
408 #elif (defined(__WINDOWS__) || defined(__WINRT__)) && defined(_M_ARM)
409  /* All WinRT ARM devices are required to support NEON, but just in case. */
410  return IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE) != 0;
411 #else
412 #warning SDL_HasNEON is not implemented for this ARM platform. Write me.
413  return 0;
414 #endif
415 }

◆ 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 617 of file SDL_cpuinfo.c.

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

Referenced by SDL_SIMDFree().

618 {
619  const char *cpuType = SDL_GetCPUType();
620  int a, b, c, d;
621  (void) a; (void) b; (void) c; (void) d;
622  if (SDL_strcmp(cpuType, "GenuineIntel") == 0) {
623  cpuid(0x00000001, a, b, c, d);
624  return (((b >> 8) & 0xff) * 8);
625  } else if (SDL_strcmp(cpuType, "AuthenticAMD") == 0) {
626  cpuid(0x80000005, a, b, c, d);
627  return (c & 0xff);
628  } else {
629  /* Just make a guess here... */
630  return SDL_CACHELINE_SIZE;
631  }
632 }
static const char * SDL_GetCPUType(void)
Definition: SDL_cpuinfo.c:506
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:95
const GLubyte * c
#define cpuid(func, a, b, c, d)
Definition: SDL_cpuinfo.c:246
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 467 of file SDL_cpuinfo.c.

References NULL, and SDL_CPUCount.

Referenced by SDL_SIMDFree().

468 {
469  if (!SDL_CPUCount) {
470 #ifndef SDL_CPUINFO_DISABLED
471 #if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
472  if (SDL_CPUCount <= 0) {
473  SDL_CPUCount = (int)sysconf(_SC_NPROCESSORS_ONLN);
474  }
475 #endif
476 #ifdef HAVE_SYSCTLBYNAME
477  if (SDL_CPUCount <= 0) {
478  size_t size = sizeof(SDL_CPUCount);
479  sysctlbyname("hw.ncpu", &SDL_CPUCount, &size, NULL, 0);
480  }
481 #endif
482 #ifdef __WIN32__
483  if (SDL_CPUCount <= 0) {
484  SYSTEM_INFO info;
485  GetSystemInfo(&info);
486  SDL_CPUCount = info.dwNumberOfProcessors;
487  }
488 #endif
489 #ifdef __OS2__
490  if (SDL_CPUCount <= 0) {
491  DosQuerySysInfo(QSV_NUMPROCESSORS, QSV_NUMPROCESSORS,
492  &SDL_CPUCount, sizeof(SDL_CPUCount) );
493  }
494 #endif
495 #endif
496  /* There has to be at least 1, right? :) */
497  if (SDL_CPUCount <= 0) {
498  SDL_CPUCount = 1;
499  }
500  }
501  return SDL_CPUCount;
502 }
GLsizeiptr size
#define NULL
Definition: begin_code.h:164
static int SDL_CPUCount
Definition: SDL_cpuinfo.c:464

◆ SDL_GetCPUFeatures()

static Uint32 SDL_GetCPUFeatures ( void  )
static

Definition at line 638 of file SDL_cpuinfo.c.

References CPU_calcCPUIDFeatures(), CPU_HAS_3DNOW, CPU_HAS_ALTIVEC, CPU_HAS_ARM_SIMD, CPU_HAS_AVX, CPU_HAS_AVX2, CPU_HAS_AVX512F, CPU_HAS_MMX, CPU_HAS_NEON, CPU_HAS_RDTSC, CPU_HAS_SSE, CPU_HAS_SSE2, CPU_HAS_SSE3, CPU_HAS_SSE41, CPU_HAS_SSE42, CPU_have3DNow(), CPU_haveAltiVec(), CPU_haveARMSIMD(), CPU_haveAVX, CPU_haveAVX2(), CPU_haveAVX512F(), CPU_haveMMX, CPU_haveNEON(), CPU_haveRDTSC, CPU_haveSSE, CPU_haveSSE2, CPU_haveSSE3, CPU_haveSSE41, CPU_haveSSE42, SDL_CPUFeatures, SDL_max, and SDL_SIMDAlignment.

Referenced by SDL_SIMDGetAlignment().

639 {
640  if (SDL_CPUFeatures == 0xFFFFFFFF) {
642  SDL_CPUFeatures = 0;
643  SDL_SIMDAlignment = 4; /* a good safe base value */
644  if (CPU_haveRDTSC()) {
646  }
647  if (CPU_haveAltiVec()) {
650  }
651  if (CPU_haveMMX()) {
654  }
655  if (CPU_have3DNow()) {
658  }
659  if (CPU_haveSSE()) {
662  }
663  if (CPU_haveSSE2()) {
666  }
667  if (CPU_haveSSE3()) {
670  }
671  if (CPU_haveSSE41()) {
674  }
675  if (CPU_haveSSE42()) {
678  }
679  if (CPU_haveAVX()) {
682  }
683  if (CPU_haveAVX2()) {
686  }
687  if (CPU_haveAVX512F()) {
690  }
691  if (CPU_haveARMSIMD()) {
694  }
695  if (CPU_haveNEON()) {
698  }
699  }
700  return SDL_CPUFeatures;
701 }
#define CPU_haveSSE2()
Definition: SDL_cpuinfo.c:434
#define CPU_haveAVX()
Definition: SDL_cpuinfo.c:438
#define CPU_HAS_SSE41
Definition: SDL_cpuinfo.c:88
#define CPU_HAS_RDTSC
Definition: SDL_cpuinfo.c:81
#define CPU_HAS_SSE3
Definition: SDL_cpuinfo.c:87
static void CPU_calcCPUIDFeatures(void)
Definition: SDL_cpuinfo.c:256
#define CPU_HAS_SSE2
Definition: SDL_cpuinfo.c:86
#define CPU_HAS_AVX512F
Definition: SDL_cpuinfo.c:93
static SDL_bool CPU_haveARMSIMD(void)
Definition: SDL_cpuinfo.c:359
static int CPU_have3DNow(void)
Definition: SDL_cpuinfo.c:418
#define CPU_haveRDTSC()
Definition: SDL_cpuinfo.c:431
#define CPU_HAS_ALTIVEC
Definition: SDL_cpuinfo.c:82
#define CPU_haveMMX()
Definition: SDL_cpuinfo.c:432
#define SDL_max(x, y)
Definition: SDL_stdinc.h:407
static int CPU_haveAltiVec(void)
Definition: SDL_cpuinfo.c:296
static int CPU_haveAVX512F(void)
Definition: SDL_cpuinfo.c:453
#define CPU_HAS_AVX
Definition: SDL_cpuinfo.c:90
#define CPU_haveSSE42()
Definition: SDL_cpuinfo.c:437
#define CPU_HAS_NEON
Definition: SDL_cpuinfo.c:92
#define CPU_haveSSE3()
Definition: SDL_cpuinfo.c:435
#define CPU_HAS_ARM_SIMD
Definition: SDL_cpuinfo.c:94
static Uint32 SDL_CPUFeatures
Definition: SDL_cpuinfo.c:634
#define CPU_HAS_SSE
Definition: SDL_cpuinfo.c:85
static int CPU_haveAVX2(void)
Definition: SDL_cpuinfo.c:441
#define CPU_HAS_AVX2
Definition: SDL_cpuinfo.c:91
static int CPU_haveNEON(void)
Definition: SDL_cpuinfo.c:389
#define CPU_haveSSE()
Definition: SDL_cpuinfo.c:433
#define CPU_HAS_MMX
Definition: SDL_cpuinfo.c:83
#define CPU_haveSSE41()
Definition: SDL_cpuinfo.c:436
#define CPU_HAS_SSE42
Definition: SDL_cpuinfo.c:89
static Uint32 SDL_SIMDAlignment
Definition: SDL_cpuinfo.c:635
#define CPU_HAS_3DNOW
Definition: SDL_cpuinfo.c:84

◆ SDL_GetCPUType()

static const char* SDL_GetCPUType ( void  )
static

Definition at line 506 of file SDL_cpuinfo.c.

References CPU_calcCPUIDFeatures(), CPU_CPUIDMaxFunction, cpuid, d, i, SDL_strlcpy, and void.

Referenced by SDL_GetCPUCacheLineSize(), and SDL_SIMDFree().

507 {
508  static char SDL_CPUType[13];
509 
510  if (!SDL_CPUType[0]) {
511  int i = 0;
512 
514  if (CPU_CPUIDMaxFunction > 0) { /* do we have CPUID at all? */
515  int a, b, c, d;
516  cpuid(0x00000000, a, b, c, d);
517  (void) a;
518  SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
519  SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
520  SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
521  SDL_CPUType[i++] = (char)(b & 0xff);
522 
523  SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
524  SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
525  SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
526  SDL_CPUType[i++] = (char)(d & 0xff);
527 
528  SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
529  SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
530  SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
531  SDL_CPUType[i++] = (char)(c & 0xff);
532  }
533  if (!SDL_CPUType[0]) {
534  SDL_strlcpy(SDL_CPUType, "Unknown", sizeof(SDL_CPUType));
535  }
536  }
537  return SDL_CPUType;
538 }
#define SDL_strlcpy
static void CPU_calcCPUIDFeatures(void)
Definition: SDL_cpuinfo.c:256
static int CPU_CPUIDMaxFunction
Definition: SDL_cpuinfo.c:251
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
const GLubyte * c
#define cpuid(func, a, b, c, d)
Definition: SDL_cpuinfo.c:246
return Display return Display Bool Bool int int int return Display XEvent Bool(*) XPointer return Display return Display Drawable _Xconst char unsigned int unsigned int return Display Pixmap Pixmap XColor XColor unsigned int unsigned int return Display _Xconst char char int char return Display Visual unsigned int int int char unsigned int unsigned int in i)
Definition: SDL_x11sym.h:50
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
GLboolean GLboolean GLboolean GLboolean a
GLboolean GLboolean GLboolean b

◆ SDL_GetSystemRAM()

int SDL_GetSystemRAM ( void  )

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

Definition at line 791 of file SDL_cpuinfo.c.

References NULL, and SDL_SystemRAM.

Referenced by SDL_SIMDFree().

792 {
793  if (!SDL_SystemRAM) {
794 #ifndef SDL_CPUINFO_DISABLED
795 #if defined(HAVE_SYSCONF) && defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
796  if (SDL_SystemRAM <= 0) {
797  SDL_SystemRAM = (int)((Sint64)sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE) / (1024*1024));
798  }
799 #endif
800 #ifdef HAVE_SYSCTLBYNAME
801  if (SDL_SystemRAM <= 0) {
802 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__)
803 #ifdef HW_REALMEM
804  int mib[2] = {CTL_HW, HW_REALMEM};
805 #else
806  /* might only report up to 2 GiB */
807  int mib[2] = {CTL_HW, HW_PHYSMEM};
808 #endif /* HW_REALMEM */
809 #else
810  int mib[2] = {CTL_HW, HW_MEMSIZE};
811 #endif /* __FreeBSD__ || __FreeBSD_kernel__ */
812  Uint64 memsize = 0;
813  size_t len = sizeof(memsize);
814 
815  if (sysctl(mib, 2, &memsize, &len, NULL, 0) == 0) {
816  SDL_SystemRAM = (int)(memsize / (1024*1024));
817  }
818  }
819 #endif
820 #ifdef __WIN32__
821  if (SDL_SystemRAM <= 0) {
822  MEMORYSTATUSEX stat;
823  stat.dwLength = sizeof(stat);
824  if (GlobalMemoryStatusEx(&stat)) {
825  SDL_SystemRAM = (int)(stat.ullTotalPhys / (1024 * 1024));
826  }
827  }
828 #endif
829 #ifdef __OS2__
830  if (SDL_SystemRAM <= 0) {
831  Uint32 sysram = 0;
832  DosQuerySysInfo(QSV_TOTPHYSMEM, QSV_TOTPHYSMEM, &sysram, 4);
833  SDL_SystemRAM = (int) (sysram / 0x100000U);
834  }
835 #endif
836 #endif
837  }
838  return SDL_SystemRAM;
839 }
static int SDL_SystemRAM
Definition: SDL_cpuinfo.c:788
uint64_t Uint64
Definition: SDL_stdinc.h:216
GLenum GLsizei len
#define NULL
Definition: begin_code.h:164
uint32_t Uint32
Definition: SDL_stdinc.h:203
int64_t Sint64
Definition: SDL_stdinc.h:210

◆ SDL_Has3DNow()

SDL_bool SDL_Has3DNow ( void  )

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

Definition at line 723 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_3DNOW.

Referenced by SDL_SIMDFree().

724 {
726 }
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703
#define CPU_HAS_3DNOW
Definition: SDL_cpuinfo.c:84

◆ SDL_HasAltiVec()

SDL_bool SDL_HasAltiVec ( void  )

This function returns true if the CPU has AltiVec features.

Definition at line 711 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_ALTIVEC.

Referenced by SDL_SIMDFree().

712 {
714 }
#define CPU_HAS_ALTIVEC
Definition: SDL_cpuinfo.c:82
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703

◆ SDL_HasARMSIMD()

SDL_bool SDL_HasARMSIMD ( void  )

This function returns true if the CPU has ARM SIMD (ARMv6) features.

Definition at line 777 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_ARM_SIMD.

Referenced by SDL_CalculateBlitA(), SDL_FillRect(), and SDL_SIMDFree().

778 {
780 }
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703
#define CPU_HAS_ARM_SIMD
Definition: SDL_cpuinfo.c:94

◆ SDL_HasAVX()

SDL_bool SDL_HasAVX ( void  )

This function returns true if the CPU has AVX features.

Definition at line 759 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_AVX.

Referenced by SDL_SIMDFree().

760 {
762 }
#define CPU_HAS_AVX
Definition: SDL_cpuinfo.c:90
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703

◆ SDL_HasAVX2()

SDL_bool SDL_HasAVX2 ( void  )

This function returns true if the CPU has AVX2 features.

Definition at line 765 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_AVX2.

Referenced by SDL_SIMDFree().

766 {
768 }
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703
#define CPU_HAS_AVX2
Definition: SDL_cpuinfo.c:91

◆ SDL_HasAVX512F()

SDL_bool SDL_HasAVX512F ( void  )

This function returns true if the CPU has AVX-512F (foundation) features.

Definition at line 771 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_AVX512F.

Referenced by SDL_SIMDFree().

772 {
774 }
#define CPU_HAS_AVX512F
Definition: SDL_cpuinfo.c:93
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703

◆ SDL_HasMMX()

SDL_bool SDL_HasMMX ( void  )

This function returns true if the CPU has MMX features.

Definition at line 717 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_MMX.

Referenced by SDL_SIMDFree().

718 {
720 }
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703
#define CPU_HAS_MMX
Definition: SDL_cpuinfo.c:83

◆ SDL_HasNEON()

SDL_bool SDL_HasNEON ( void  )

This function returns true if the CPU has NEON (ARM SIMD) features.

Definition at line 783 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_NEON.

Referenced by SDL_SIMDFree().

784 {
786 }
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703
#define CPU_HAS_NEON
Definition: SDL_cpuinfo.c:92

◆ SDL_HasRDTSC()

SDL_bool SDL_HasRDTSC ( void  )

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

Definition at line 705 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_RDTSC.

Referenced by SDL_SIMDFree().

706 {
708 }
#define CPU_HAS_RDTSC
Definition: SDL_cpuinfo.c:81
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703

◆ SDL_HasSSE()

SDL_bool SDL_HasSSE ( void  )

This function returns true if the CPU has SSE features.

Definition at line 729 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE.

Referenced by SDL_SIMDFree().

730 {
732 }
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703
#define CPU_HAS_SSE
Definition: SDL_cpuinfo.c:85

◆ SDL_HasSSE2()

SDL_bool SDL_HasSSE2 ( void  )

This function returns true if the CPU has SSE2 features.

Definition at line 735 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE2.

Referenced by SDL_SIMDFree().

736 {
738 }
#define CPU_HAS_SSE2
Definition: SDL_cpuinfo.c:86
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703

◆ SDL_HasSSE3()

SDL_bool SDL_HasSSE3 ( void  )

This function returns true if the CPU has SSE3 features.

Definition at line 741 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE3.

Referenced by SDL_SIMDFree().

742 {
744 }
#define CPU_HAS_SSE3
Definition: SDL_cpuinfo.c:87
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703

◆ SDL_HasSSE41()

SDL_bool SDL_HasSSE41 ( void  )

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

Definition at line 747 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE41.

Referenced by SDL_SIMDFree().

748 {
750 }
#define CPU_HAS_SSE41
Definition: SDL_cpuinfo.c:88
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703

◆ SDL_HasSSE42()

SDL_bool SDL_HasSSE42 ( void  )

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

Definition at line 753 of file SDL_cpuinfo.c.

References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE42.

Referenced by SDL_SIMDFree().

754 {
756 }
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:703
#define CPU_HAS_SSE42
Definition: SDL_cpuinfo.c:89

◆ SDL_SIMDAlloc()

void* SDL_SIMDAlloc ( const size_t  len)

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.

Parameters
lenThe length, in bytes, of the block to allocated. The actual allocated block might be larger due to padding, etc.
Returns
Pointer to newly-allocated block, NULL if out of memory.
See also
SDL_SIMDAlignment
SDL_SIMDFree

Definition at line 853 of file SDL_cpuinfo.c.

References NULL, ptr, retval, SDL_malloc, and SDL_SIMDGetAlignment().

854 {
855  const size_t alignment = SDL_SIMDGetAlignment();
856  const size_t padding = alignment - (len % alignment);
857  const size_t padded = (padding != alignment) ? (len + padding) : len;
858  Uint8 *retval = NULL;
859  Uint8 *ptr = (Uint8 *) SDL_malloc(padded + alignment + sizeof (void *));
860  if (ptr) {
861  /* store the actual malloc pointer right before our aligned pointer. */
862  retval = ptr + sizeof (void *);
863  retval += alignment - (((size_t) retval) % alignment);
864  *(((void **) retval) - 1) = ptr;
865  }
866  return retval;
867 }
set set set set set set set set set set set set set set set set set set set set *set set set macro pixldst op &r &cond WK op &r &cond WK op &r &cond WK else op &m &cond &ia op &r &cond WK else op &m &cond &ia elseif elseif else error unsupported base if elseif elseif else error unsupported unaligned pixldst unaligned endm macro pixst base base else pixldst base endif endm macro PF ptr
unsigned int size_t
GLenum GLsizei len
SDL_bool retval
uint8_t Uint8
Definition: SDL_stdinc.h:179
#define NULL
Definition: begin_code.h:164
#define SDL_malloc
size_t SDL_SIMDGetAlignment(void)
Report the alignment this system needs for SIMD allocations.
Definition: SDL_cpuinfo.c:843

◆ SDL_SIMDFree()

void SDL_SIMDFree ( void ptr)

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.

See also
SDL_SIMDAlloc

Definition at line 870 of file SDL_cpuinfo.c.

References main, SDL_free, SDL_GetCPUCacheLineSize(), SDL_GetCPUCount(), SDL_GetCPUType(), SDL_GetSystemRAM(), SDL_Has3DNow(), SDL_HasAltiVec(), SDL_HasARMSIMD(), SDL_HasAVX(), SDL_HasAVX2(), SDL_HasAVX512F(), SDL_HasMMX(), SDL_HasNEON(), SDL_HasRDTSC(), SDL_HasSSE(), SDL_HasSSE2(), SDL_HasSSE3(), SDL_HasSSE41(), and SDL_HasSSE42().

871 {
872  if (ptr) {
873  void **realptr = (void **) ptr;
874  realptr--;
875  SDL_free(*(((void **) ptr) - 1));
876  }
877 }
set set set set set set set set set set set set set set set set set set set set *set set set macro pixldst op &r &cond WK op &r &cond WK op &r &cond WK else op &m &cond &ia op &r &cond WK else op &m &cond &ia elseif elseif else error unsupported base if elseif elseif else error unsupported unaligned pixldst unaligned endm macro pixst base base else pixldst base endif endm macro PF ptr
#define SDL_free

◆ SDL_SIMDGetAlignment()

size_t SDL_SIMDGetAlignment ( void  )

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.

Definition at line 843 of file SDL_cpuinfo.c.

References SDL_assert, SDL_GetCPUFeatures(), and SDL_SIMDAlignment.

Referenced by SDL_SIMDAlloc().

844 {
845  if (SDL_SIMDAlignment == 0xFFFFFFFF) {
846  SDL_GetCPUFeatures(); /* make sure this has been calculated */
847  }
849  return SDL_SIMDAlignment;
850 }
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:638
#define SDL_assert(condition)
Definition: SDL_assert.h:169
static Uint32 SDL_SIMDAlignment
Definition: SDL_cpuinfo.c:635

Variable Documentation

◆ CPU_CPUIDFeatures

int CPU_CPUIDFeatures[4]
static

Definition at line 250 of file SDL_cpuinfo.c.

Referenced by CPU_calcCPUIDFeatures().

◆ CPU_CPUIDMaxFunction

int CPU_CPUIDMaxFunction = 0
static

◆ CPU_OSSavesYMM

SDL_bool CPU_OSSavesYMM = SDL_FALSE
static

Definition at line 252 of file SDL_cpuinfo.c.

Referenced by CPU_calcCPUIDFeatures(), and CPU_haveAVX2().

◆ CPU_OSSavesZMM

SDL_bool CPU_OSSavesZMM = SDL_FALSE
static

Definition at line 253 of file SDL_cpuinfo.c.

Referenced by CPU_calcCPUIDFeatures(), and CPU_haveAVX512F().

◆ SDL_CPUCount

int SDL_CPUCount = 0
static

Definition at line 464 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUCount().

◆ SDL_CPUFeatures

Uint32 SDL_CPUFeatures = 0xFFFFFFFF
static

Definition at line 634 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures().

◆ SDL_SIMDAlignment

Uint32 SDL_SIMDAlignment = 0xFFFFFFFF
static

Definition at line 635 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_SIMDGetAlignment().

◆ SDL_SystemRAM

int SDL_SystemRAM = 0
static

Definition at line 788 of file SDL_cpuinfo.c.

Referenced by SDL_GetSystemRAM().