SDL 2.0
SDL_cpuinfo.c File Reference
#include "../SDL_internal.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 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 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_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

#define CPU_FEATURE_AVAILABLE (   f)    ((SDL_GetCPUFeatures() & f) ? SDL_TRUE : SDL_FALSE)

Definition at line 679 of file SDL_cpuinfo.c.

◆ CPU_HAS_3DNOW

#define CPU_HAS_3DNOW   (1 << 3)

Definition at line 89 of file SDL_cpuinfo.c.

◆ CPU_HAS_ALTIVEC

#define CPU_HAS_ALTIVEC   (1 << 1)

Definition at line 87 of file SDL_cpuinfo.c.

◆ CPU_HAS_AVX

#define CPU_HAS_AVX   (1 << 9)

Definition at line 95 of file SDL_cpuinfo.c.

◆ CPU_HAS_AVX2

#define CPU_HAS_AVX2   (1 << 10)

Definition at line 96 of file SDL_cpuinfo.c.

◆ CPU_HAS_AVX512F

#define CPU_HAS_AVX512F   (1 << 12)

Definition at line 98 of file SDL_cpuinfo.c.

◆ CPU_HAS_MMX

#define CPU_HAS_MMX   (1 << 2)

Definition at line 88 of file SDL_cpuinfo.c.

◆ CPU_HAS_NEON

#define CPU_HAS_NEON   (1 << 11)

Definition at line 97 of file SDL_cpuinfo.c.

◆ CPU_HAS_RDTSC

#define CPU_HAS_RDTSC   (1 << 0)

Definition at line 86 of file SDL_cpuinfo.c.

◆ CPU_HAS_SSE

#define CPU_HAS_SSE   (1 << 4)

Definition at line 90 of file SDL_cpuinfo.c.

◆ CPU_HAS_SSE2

#define CPU_HAS_SSE2   (1 << 5)

Definition at line 91 of file SDL_cpuinfo.c.

◆ CPU_HAS_SSE3

#define CPU_HAS_SSE3   (1 << 6)

Definition at line 92 of file SDL_cpuinfo.c.

◆ CPU_HAS_SSE41

#define CPU_HAS_SSE41   (1 << 7)

Definition at line 93 of file SDL_cpuinfo.c.

◆ CPU_HAS_SSE42

#define CPU_HAS_SSE42   (1 << 8)

Definition at line 94 of file SDL_cpuinfo.c.

◆ CPU_haveAVX

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

Definition at line 418 of file SDL_cpuinfo.c.

◆ CPU_haveMMX

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

Definition at line 412 of file SDL_cpuinfo.c.

◆ CPU_haveRDTSC

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

Definition at line 411 of file SDL_cpuinfo.c.

◆ CPU_haveSSE

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

Definition at line 413 of file SDL_cpuinfo.c.

◆ CPU_haveSSE2

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

Definition at line 414 of file SDL_cpuinfo.c.

◆ CPU_haveSSE3

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

Definition at line 415 of file SDL_cpuinfo.c.

◆ CPU_haveSSE41

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

Definition at line 416 of file SDL_cpuinfo.c.

◆ CPU_haveSSE42

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

Definition at line 417 of file SDL_cpuinfo.c.

◆ cpuid

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

Definition at line 250 of file SDL_cpuinfo.c.

Function Documentation

◆ CPU_calcCPUIDFeatures()

static void CPU_calcCPUIDFeatures ( void  )
static

Definition at line 260 of file SDL_cpuinfo.c.

261{
262 static SDL_bool checked = SDL_FALSE;
263 if (!checked) {
264 checked = SDL_TRUE;
265 if (CPU_haveCPUID()) {
266 int a, b, c, d;
267 cpuid(0, a, b, c, d);
269 if (CPU_CPUIDMaxFunction >= 1) {
270 cpuid(1, a, b, c, d);
271 CPU_CPUIDFeatures[0] = a;
272 CPU_CPUIDFeatures[1] = b;
273 CPU_CPUIDFeatures[2] = c;
274 CPU_CPUIDFeatures[3] = d;
275
276 /* Check to make sure we can call xgetbv */
277 if (c & 0x08000000) {
278 /* Call xgetbv to see if YMM (etc) register state is saved */
279#if defined(__GNUC__) && (defined(i386) || defined(__x86_64__))
280 __asm__(".byte 0x0f, 0x01, 0xd0" : "=a" (a) : "c" (0) : "%edx");
281#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_M_X64)) && (_MSC_FULL_VER >= 160040219) /* VS2010 SP1 */
282 a = (int)_xgetbv(0);
283#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
284 __asm
285 {
286 xor ecx, ecx
287 _asm _emit 0x0f _asm _emit 0x01 _asm _emit 0xd0
288 mov a, eax
289 }
290#endif
291 CPU_OSSavesYMM = ((a & 6) == 6) ? SDL_TRUE : SDL_FALSE;
292 CPU_OSSavesZMM = (CPU_OSSavesYMM && ((a & 0xe0) == 0xe0)) ? SDL_TRUE : SDL_FALSE;
293 }
294 }
295 }
296 }
297}
static SDL_bool CPU_OSSavesYMM
Definition: SDL_cpuinfo.c:256
#define cpuid(func, a, b, c, d)
Definition: SDL_cpuinfo.c:250
static SDL_bool CPU_OSSavesZMM
Definition: SDL_cpuinfo.c:257
static int CPU_CPUIDMaxFunction
Definition: SDL_cpuinfo.c:255
static int CPU_haveCPUID(void)
Definition: SDL_cpuinfo.c:113
static int CPU_CPUIDFeatures[4]
Definition: SDL_cpuinfo.c:254
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
GLboolean GLboolean GLboolean b
GLboolean GLboolean GLboolean GLboolean a
const GLubyte * c
SDL_bool
Definition: SDL_stdinc.h:162
@ SDL_TRUE
Definition: SDL_stdinc.h:164
@ SDL_FALSE
Definition: SDL_stdinc.h:163

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

Referenced by SDL_GetCPUFeatures(), and SDL_GetCPUType().

◆ CPU_have3DNow()

static int CPU_have3DNow ( void  )
static

Definition at line 398 of file SDL_cpuinfo.c.

399{
400 if (CPU_CPUIDMaxFunction > 0) { /* that is, do we have CPUID at all? */
401 int a, b, c, d;
402 cpuid(0x80000000, a, b, c, d);
403 if (a >= 0x80000001) {
404 cpuid(0x80000001, a, b, c, d);
405 return (d & 0x80000000);
406 }
407 }
408 return 0;
409}

References CPU_CPUIDMaxFunction, cpuid, and d.

Referenced by SDL_GetCPUFeatures().

◆ CPU_haveAltiVec()

static int CPU_haveAltiVec ( void  )
static

Definition at line 300 of file SDL_cpuinfo.c.

301{
302 volatile int altivec = 0;
303#ifndef SDL_CPUINFO_DISABLED
304#if (defined(__MACOSX__) && (defined(__ppc__) || defined(__ppc64__))) || (defined(__OpenBSD__) && defined(__powerpc__))
305#ifdef __OpenBSD__
306 int selectors[2] = { CTL_MACHDEP, CPU_ALTIVEC };
307#else
308 int selectors[2] = { CTL_HW, HW_VECTORUNIT };
309#endif
310 int hasVectorUnit = 0;
311 size_t length = sizeof(hasVectorUnit);
312 int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
313 if (0 == error)
314 altivec = (hasVectorUnit != 0);
315#elif SDL_ALTIVEC_BLITTERS && HAVE_SETJMP
316 void (*handler) (int sig);
317 handler = signal(SIGILL, illegal_instruction);
318 if (setjmp(jmpbuf) == 0) {
319 asm volatile ("mtspr 256, %0\n\t" "vand %%v0, %%v0, %%v0"::"r" (-1));
320 altivec = 1;
321 }
322 signal(SIGILL, handler);
323#endif
324#endif
325 return altivec;
326}
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
#define NULL
Definition: begin_code.h:167

References NULL, and void.

Referenced by SDL_GetCPUFeatures().

◆ CPU_haveAVX2()

static int CPU_haveAVX2 ( void  )
static

Definition at line 421 of file SDL_cpuinfo.c.

422{
423 if (CPU_OSSavesYMM && (CPU_CPUIDMaxFunction >= 7)) {
424 int a, b, c, d;
425 (void) a; (void) b; (void) c; (void) d; /* compiler warnings... */
426 cpuid(7, a, b, c, d);
427 return (b & 0x00000020);
428 }
429 return 0;
430}

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

Referenced by SDL_GetCPUFeatures().

◆ CPU_haveAVX512F()

static int CPU_haveAVX512F ( void  )
static

Definition at line 433 of file SDL_cpuinfo.c.

434{
435 if (CPU_OSSavesZMM && (CPU_CPUIDMaxFunction >= 7)) {
436 int a, b, c, d;
437 (void) a; (void) b; (void) c; (void) d; /* compiler warnings... */
438 cpuid(7, a, b, c, d);
439 return (b & 0x00010000);
440 }
441 return 0;
442}

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

Referenced by SDL_GetCPUFeatures().

◆ CPU_haveCPUID()

static int CPU_haveCPUID ( void  )
static

Definition at line 113 of file SDL_cpuinfo.c.

114{
115 int has_CPUID = 0;
116
117/* *INDENT-OFF* */
118#ifndef SDL_CPUINFO_DISABLED
119#if defined(__GNUC__) && defined(i386)
120 __asm__ (
121" pushfl # Get original EFLAGS \n"
122" popl %%eax \n"
123" movl %%eax,%%ecx \n"
124" xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n"
125" pushl %%eax # Save new EFLAGS value on stack \n"
126" popfl # Replace current EFLAGS value \n"
127" pushfl # Get new EFLAGS \n"
128" popl %%eax # Store new EFLAGS in EAX \n"
129" xorl %%ecx,%%eax # Can not toggle ID bit, \n"
130" jz 1f # Processor=80486 \n"
131" movl $1,%0 # We have CPUID support \n"
132"1: \n"
133 : "=m" (has_CPUID)
134 :
135 : "%eax", "%ecx"
136 );
137#elif defined(__GNUC__) && defined(__x86_64__)
138/* Technically, if this is being compiled under __x86_64__ then it has
139 CPUid by definition. But it's nice to be able to prove it. :) */
140 __asm__ (
141" pushfq # Get original EFLAGS \n"
142" popq %%rax \n"
143" movq %%rax,%%rcx \n"
144" xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n"
145" pushq %%rax # Save new EFLAGS value on stack \n"
146" popfq # Replace current EFLAGS value \n"
147" pushfq # Get new EFLAGS \n"
148" popq %%rax # Store new EFLAGS in EAX \n"
149" xorl %%ecx,%%eax # Can not toggle ID bit, \n"
150" jz 1f # Processor=80486 \n"
151" movl $1,%0 # We have CPUID support \n"
152"1: \n"
153 : "=m" (has_CPUID)
154 :
155 : "%rax", "%rcx"
156 );
157#elif (defined(_MSC_VER) && defined(_M_IX86)) || defined(__WATCOMC__)
158 __asm {
159 pushfd ; Get original EFLAGS
160 pop eax
161 mov ecx, eax
162 xor eax, 200000h ; Flip ID bit in EFLAGS
163 push eax ; Save new EFLAGS value on stack
164 popfd ; Replace current EFLAGS value
165 pushfd ; Get new EFLAGS
166 pop eax ; Store new EFLAGS in EAX
167 xor eax, ecx ; Can not toggle ID bit,
168 jz done ; Processor=80486
169 mov has_CPUID,1 ; We have CPUID support
170done:
171 }
172#elif defined(_MSC_VER) && defined(_M_X64)
173 has_CPUID = 1;
174#elif defined(__sun) && defined(__i386)
175 __asm (
176" pushfl \n"
177" popl %eax \n"
178" movl %eax,%ecx \n"
179" xorl $0x200000,%eax \n"
180" pushl %eax \n"
181" popfl \n"
182" pushfl \n"
183" popl %eax \n"
184" xorl %ecx,%eax \n"
185" jz 1f \n"
186" movl $1,-8(%ebp) \n"
187"1: \n"
188 );
189#elif defined(__sun) && defined(__amd64)
190 __asm (
191" pushfq \n"
192" popq %rax \n"
193" movq %rax,%rcx \n"
194" xorl $0x200000,%eax \n"
195" pushq %rax \n"
196" popfq \n"
197" pushfq \n"
198" popq %rax \n"
199" xorl %ecx,%eax \n"
200" jz 1f \n"
201" movl $1,-8(%rbp) \n"
202"1: \n"
203 );
204#endif
205#endif
206/* *INDENT-ON* */
207 return has_CPUID;
208}
GLuint in
GLsizei const GLfloat * value
GLfloat GLfloat GLfloat GLfloat h
#define pop
Definition: SDL_qsort.c:192
int done
Definition: checkkeys.c:28

References done, and pop.

Referenced by CPU_calcCPUIDFeatures().

◆ CPU_haveNEON()

static int CPU_haveNEON ( void  )
static

Definition at line 350 of file SDL_cpuinfo.c.

351{
352/* The way you detect NEON is a privileged instruction on ARM, so you have
353 query the OS kernel in a platform-specific way. :/ */
354#if defined(SDL_CPUINFO_DISABLED)
355 return 0; /* disabled */
356#elif (defined(__WINDOWS__) || defined(__WINRT__)) && (defined(_M_ARM) || defined(_M_ARM64))
357/* Visual Studio, for ARM, doesn't define __ARM_ARCH. Handle this first. */
358/* Seems to have been removed */
359# if !defined(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE)
360# define PF_ARM_NEON_INSTRUCTIONS_AVAILABLE 19
361# endif
362/* All WinRT ARM devices are required to support NEON, but just in case. */
363 return IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE) != 0;
364#elif !defined(__ARM_ARCH)
365 return 0; /* not an ARM CPU at all. */
366#elif __ARM_ARCH >= 8
367 return 1; /* ARMv8 always has non-optional NEON support. */
368#elif defined(__APPLE__) && (__ARM_ARCH >= 7)
369 /* (note that sysctlbyname("hw.optional.neon") doesn't work!) */
370 return 1; /* all Apple ARMv7 chips and later have NEON. */
371#elif defined(__APPLE__)
372 return 0; /* assume anything else from Apple doesn't have NEON. */
373#elif defined(__QNXNTO__)
374 return SYSPAGE_ENTRY(cpuinfo)->flags & ARM_CPU_FLAG_NEON;
375#elif (defined(__LINUX__) || defined(__ANDROID__)) && defined(HAVE_GETAUXVAL)
376 return ((getauxval(AT_HWCAP) & HWCAP_NEON) == HWCAP_NEON);
377#elif defined(__LINUX__)
378 return readProcAuxvForNeon();
379#elif defined(__ANDROID__)
380 /* Use NDK cpufeatures to read either /proc/self/auxv or /proc/cpuinfo */
381 {
382 AndroidCpuFamily cpu_family = android_getCpuFamily();
383 if (cpu_family == ANDROID_CPU_FAMILY_ARM) {
384 uint64_t cpu_features = android_getCpuFeatures();
385 if ((cpu_features & ANDROID_CPU_ARM_FEATURE_NEON) != 0) {
386 return 1;
387 }
388 }
389 return 0;
390 }
391#else
392#warning SDL_HasNEON is not implemented for this ARM platform. Write me.
393 return 0;
394#endif
395}
unsigned long long uint64_t

Referenced by SDL_GetCPUFeatures().

◆ 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 597 of file SDL_cpuinfo.c.

598{
599 const char *cpuType = SDL_GetCPUType();
600 int a, b, c, d;
601 (void) a; (void) b; (void) c; (void) d;
602 if (SDL_strcmp(cpuType, "GenuineIntel") == 0) {
603 cpuid(0x00000001, a, b, c, d);
604 return (((b >> 8) & 0xff) * 8);
605 } else if (SDL_strcmp(cpuType, "AuthenticAMD") == 0) {
606 cpuid(0x80000005, a, b, c, d);
607 return (c & 0xff);
608 } else {
609 /* Just make a guess here... */
610 return SDL_CACHELINE_SIZE;
611 }
612}
static const char * SDL_GetCPUType(void)
Definition: SDL_cpuinfo.c:486
#define SDL_CACHELINE_SIZE
Definition: SDL_cpuinfo.h:114
#define SDL_strcmp

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

◆ SDL_GetCPUCount()

int SDL_GetCPUCount ( void  )

This function returns the number of CPU cores available.

Definition at line 447 of file SDL_cpuinfo.c.

448{
449 if (!SDL_CPUCount) {
450#ifndef SDL_CPUINFO_DISABLED
451#if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
452 if (SDL_CPUCount <= 0) {
453 SDL_CPUCount = (int)sysconf(_SC_NPROCESSORS_ONLN);
454 }
455#endif
456#ifdef HAVE_SYSCTLBYNAME
457 if (SDL_CPUCount <= 0) {
458 size_t size = sizeof(SDL_CPUCount);
459 sysctlbyname("hw.ncpu", &SDL_CPUCount, &size, NULL, 0);
460 }
461#endif
462#ifdef __WIN32__
463 if (SDL_CPUCount <= 0) {
464 SYSTEM_INFO info;
465 GetSystemInfo(&info);
466 SDL_CPUCount = info.dwNumberOfProcessors;
467 }
468#endif
469#ifdef __OS2__
470 if (SDL_CPUCount <= 0) {
471 DosQuerySysInfo(QSV_NUMPROCESSORS, QSV_NUMPROCESSORS,
472 &SDL_CPUCount, sizeof(SDL_CPUCount) );
473 }
474#endif
475#endif
476 /* There has to be at least 1, right? :) */
477 if (SDL_CPUCount <= 0) {
478 SDL_CPUCount = 1;
479 }
480 }
481 return SDL_CPUCount;
482}
static int SDL_CPUCount
Definition: SDL_cpuinfo.c:444
GLsizeiptr size

References NULL, and SDL_CPUCount.

◆ SDL_GetCPUFeatures()

static Uint32 SDL_GetCPUFeatures ( void  )
static

Definition at line 618 of file SDL_cpuinfo.c.

619{
620 if (SDL_CPUFeatures == 0xFFFFFFFF) {
622 SDL_CPUFeatures = 0;
623 SDL_SIMDAlignment = 4; /* a good safe base value */
624 if (CPU_haveRDTSC()) {
626 }
627 if (CPU_haveAltiVec()) {
630 }
631 if (CPU_haveMMX()) {
634 }
635 if (CPU_have3DNow()) {
638 }
639 if (CPU_haveSSE()) {
642 }
643 if (CPU_haveSSE2()) {
646 }
647 if (CPU_haveSSE3()) {
650 }
651 if (CPU_haveSSE41()) {
654 }
655 if (CPU_haveSSE42()) {
658 }
659 if (CPU_haveAVX()) {
662 }
663 if (CPU_haveAVX2()) {
666 }
667 if (CPU_haveAVX512F()) {
670 }
671 if (CPU_haveNEON()) {
674 }
675 }
676 return SDL_CPUFeatures;
677}
static int CPU_haveAVX512F(void)
Definition: SDL_cpuinfo.c:433
#define CPU_haveSSE3()
Definition: SDL_cpuinfo.c:415
#define CPU_HAS_SSE42
Definition: SDL_cpuinfo.c:94
static Uint32 SDL_SIMDAlignment
Definition: SDL_cpuinfo.c:615
#define CPU_haveSSE41()
Definition: SDL_cpuinfo.c:416
#define CPU_HAS_SSE3
Definition: SDL_cpuinfo.c:92
#define CPU_HAS_MMX
Definition: SDL_cpuinfo.c:88
#define CPU_haveSSE42()
Definition: SDL_cpuinfo.c:417
#define CPU_HAS_SSE2
Definition: SDL_cpuinfo.c:91
#define CPU_haveSSE()
Definition: SDL_cpuinfo.c:413
static Uint32 SDL_CPUFeatures
Definition: SDL_cpuinfo.c:614
#define CPU_HAS_SSE
Definition: SDL_cpuinfo.c:90
#define CPU_HAS_SSE41
Definition: SDL_cpuinfo.c:93
static int CPU_have3DNow(void)
Definition: SDL_cpuinfo.c:398
#define CPU_haveAVX()
Definition: SDL_cpuinfo.c:418
static int CPU_haveAVX2(void)
Definition: SDL_cpuinfo.c:421
#define CPU_HAS_AVX2
Definition: SDL_cpuinfo.c:96
#define CPU_HAS_ALTIVEC
Definition: SDL_cpuinfo.c:87
#define CPU_HAS_RDTSC
Definition: SDL_cpuinfo.c:86
static void CPU_calcCPUIDFeatures(void)
Definition: SDL_cpuinfo.c:260
#define CPU_HAS_NEON
Definition: SDL_cpuinfo.c:97
#define CPU_haveMMX()
Definition: SDL_cpuinfo.c:412
#define CPU_haveSSE2()
Definition: SDL_cpuinfo.c:414
#define CPU_haveRDTSC()
Definition: SDL_cpuinfo.c:411
#define CPU_HAS_AVX
Definition: SDL_cpuinfo.c:95
static int CPU_haveAltiVec(void)
Definition: SDL_cpuinfo.c:300
#define CPU_HAS_AVX512F
Definition: SDL_cpuinfo.c:98
static int CPU_haveNEON(void)
Definition: SDL_cpuinfo.c:350
#define CPU_HAS_3DNOW
Definition: SDL_cpuinfo.c:89
#define SDL_max(x, y)
Definition: SDL_stdinc.h:407

References CPU_calcCPUIDFeatures(), CPU_HAS_3DNOW, CPU_HAS_ALTIVEC, 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_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().

◆ SDL_GetCPUType()

static const char * SDL_GetCPUType ( void  )
static

Definition at line 486 of file SDL_cpuinfo.c.

487{
488 static char SDL_CPUType[13];
489
490 if (!SDL_CPUType[0]) {
491 int i = 0;
492
494 if (CPU_CPUIDMaxFunction > 0) { /* do we have CPUID at all? */
495 int a, b, c, d;
496 cpuid(0x00000000, a, b, c, d);
497 (void) a;
498 SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
499 SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
500 SDL_CPUType[i++] = (char)(b & 0xff); b >>= 8;
501 SDL_CPUType[i++] = (char)(b & 0xff);
502
503 SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
504 SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
505 SDL_CPUType[i++] = (char)(d & 0xff); d >>= 8;
506 SDL_CPUType[i++] = (char)(d & 0xff);
507
508 SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
509 SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
510 SDL_CPUType[i++] = (char)(c & 0xff); c >>= 8;
511 SDL_CPUType[i++] = (char)(c & 0xff);
512 }
513 if (!SDL_CPUType[0]) {
514 SDL_strlcpy(SDL_CPUType, "Unknown", sizeof(SDL_CPUType));
515 }
516 }
517 return SDL_CPUType;
518}
#define SDL_strlcpy
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

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

Referenced by SDL_GetCPUCacheLineSize().

◆ SDL_GetSystemRAM()

int SDL_GetSystemRAM ( void  )

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

Definition at line 761 of file SDL_cpuinfo.c.

762{
763 if (!SDL_SystemRAM) {
764#ifndef SDL_CPUINFO_DISABLED
765#if defined(HAVE_SYSCONF) && defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
766 if (SDL_SystemRAM <= 0) {
767 SDL_SystemRAM = (int)((Sint64)sysconf(_SC_PHYS_PAGES) * sysconf(_SC_PAGESIZE) / (1024*1024));
768 }
769#endif
770#ifdef HAVE_SYSCTLBYNAME
771 if (SDL_SystemRAM <= 0) {
772#if defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__)
773#ifdef HW_REALMEM
774 int mib[2] = {CTL_HW, HW_REALMEM};
775#else
776 /* might only report up to 2 GiB */
777 int mib[2] = {CTL_HW, HW_PHYSMEM};
778#endif /* HW_REALMEM */
779#else
780 int mib[2] = {CTL_HW, HW_MEMSIZE};
781#endif /* __FreeBSD__ || __FreeBSD_kernel__ */
782 Uint64 memsize = 0;
783 size_t len = sizeof(memsize);
784
785 if (sysctl(mib, 2, &memsize, &len, NULL, 0) == 0) {
786 SDL_SystemRAM = (int)(memsize / (1024*1024));
787 }
788 }
789#endif
790#ifdef __WIN32__
791 if (SDL_SystemRAM <= 0) {
792 MEMORYSTATUSEX stat;
793 stat.dwLength = sizeof(stat);
794 if (GlobalMemoryStatusEx(&stat)) {
795 SDL_SystemRAM = (int)(stat.ullTotalPhys / (1024 * 1024));
796 }
797 }
798#endif
799#ifdef __OS2__
800 if (SDL_SystemRAM <= 0) {
801 Uint32 sysram = 0;
802 DosQuerySysInfo(QSV_TOTPHYSMEM, QSV_TOTPHYSMEM, &sysram, 4);
803 SDL_SystemRAM = (int) (sysram / 0x100000U);
804 }
805#endif
806#endif
807 }
808 return SDL_SystemRAM;
809}
static int SDL_SystemRAM
Definition: SDL_cpuinfo.c:758
GLenum GLsizei len
uint32_t Uint32
Definition: SDL_stdinc.h:203
uint64_t Uint64
Definition: SDL_stdinc.h:216
int64_t Sint64
Definition: SDL_stdinc.h:210

References NULL, and SDL_SystemRAM.

◆ SDL_Has3DNow()

SDL_bool SDL_Has3DNow ( void  )

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

Definition at line 699 of file SDL_cpuinfo.c.

700{
702}
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:679

References CPU_FEATURE_AVAILABLE, and CPU_HAS_3DNOW.

◆ SDL_HasAltiVec()

SDL_bool SDL_HasAltiVec ( void  )

This function returns true if the CPU has AltiVec features.

Definition at line 687 of file SDL_cpuinfo.c.

688{
690}

References CPU_FEATURE_AVAILABLE, and CPU_HAS_ALTIVEC.

◆ SDL_HasAVX()

SDL_bool SDL_HasAVX ( void  )

This function returns true if the CPU has AVX features.

Definition at line 735 of file SDL_cpuinfo.c.

736{
738}

References CPU_FEATURE_AVAILABLE, and CPU_HAS_AVX.

◆ SDL_HasAVX2()

SDL_bool SDL_HasAVX2 ( void  )

This function returns true if the CPU has AVX2 features.

Definition at line 741 of file SDL_cpuinfo.c.

742{
744}

References CPU_FEATURE_AVAILABLE, and CPU_HAS_AVX2.

◆ SDL_HasAVX512F()

SDL_bool SDL_HasAVX512F ( void  )

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

Definition at line 747 of file SDL_cpuinfo.c.

748{
750}

References CPU_FEATURE_AVAILABLE, and CPU_HAS_AVX512F.

◆ SDL_HasMMX()

SDL_bool SDL_HasMMX ( void  )

This function returns true if the CPU has MMX features.

Definition at line 693 of file SDL_cpuinfo.c.

694{
696}

References CPU_FEATURE_AVAILABLE, and CPU_HAS_MMX.

◆ SDL_HasNEON()

SDL_bool SDL_HasNEON ( void  )

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

Definition at line 753 of file SDL_cpuinfo.c.

754{
756}

References CPU_FEATURE_AVAILABLE, and CPU_HAS_NEON.

◆ SDL_HasRDTSC()

SDL_bool SDL_HasRDTSC ( void  )

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

Definition at line 681 of file SDL_cpuinfo.c.

682{
684}

References CPU_FEATURE_AVAILABLE, and CPU_HAS_RDTSC.

◆ SDL_HasSSE()

SDL_bool SDL_HasSSE ( void  )

This function returns true if the CPU has SSE features.

Definition at line 705 of file SDL_cpuinfo.c.

706{
708}

References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE.

◆ SDL_HasSSE2()

SDL_bool SDL_HasSSE2 ( void  )

This function returns true if the CPU has SSE2 features.

Definition at line 711 of file SDL_cpuinfo.c.

712{
714}

References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE2.

◆ SDL_HasSSE3()

SDL_bool SDL_HasSSE3 ( void  )

This function returns true if the CPU has SSE3 features.

Definition at line 717 of file SDL_cpuinfo.c.

718{
720}

References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE3.

◆ SDL_HasSSE41()

SDL_bool SDL_HasSSE41 ( void  )

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

Definition at line 723 of file SDL_cpuinfo.c.

724{
726}

References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE41.

◆ SDL_HasSSE42()

SDL_bool SDL_HasSSE42 ( void  )

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

Definition at line 729 of file SDL_cpuinfo.c.

730{
732}

References CPU_FEATURE_AVAILABLE, and CPU_HAS_SSE42.

◆ 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 823 of file SDL_cpuinfo.c.

824{
825 const size_t alignment = SDL_SIMDGetAlignment();
826 const size_t padding = alignment - (len % alignment);
827 const size_t padded = (padding != alignment) ? (len + padding) : len;
828 Uint8 *retval = NULL;
829 Uint8 *ptr = (Uint8 *) SDL_malloc(padded + alignment + sizeof (void *));
830 if (ptr) {
831 /* store the actual malloc pointer right before our aligned pointer. */
832 retval = ptr + sizeof (void *);
833 retval += alignment - (((size_t) retval) % alignment);
834 *(((void **) retval) - 1) = ptr;
835 }
836 return retval;
837}
unsigned int size_t
size_t SDL_SIMDGetAlignment(void)
Report the alignment this system needs for SIMD allocations.
Definition: SDL_cpuinfo.c:813
#define SDL_malloc
uint8_t Uint8
Definition: SDL_stdinc.h:179
SDL_bool retval

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

◆ 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 840 of file SDL_cpuinfo.c.

841{
842 if (ptr) {
843 void **realptr = (void **) ptr;
844 realptr--;
845 SDL_free(*(((void **) ptr) - 1));
846 }
847}
#define SDL_free

References 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 813 of file SDL_cpuinfo.c.

814{
815 if (SDL_SIMDAlignment == 0xFFFFFFFF) {
816 SDL_GetCPUFeatures(); /* make sure this has been calculated */
817 }
819 return SDL_SIMDAlignment;
820}
#define SDL_assert(condition)
Definition: SDL_assert.h:169
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:618

References SDL_assert, SDL_GetCPUFeatures(), and SDL_SIMDAlignment.

Referenced by SDL_SIMDAlloc().

Variable Documentation

◆ CPU_CPUIDFeatures

int CPU_CPUIDFeatures[4]
static

Definition at line 254 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 256 of file SDL_cpuinfo.c.

Referenced by CPU_calcCPUIDFeatures(), and CPU_haveAVX2().

◆ CPU_OSSavesZMM

SDL_bool CPU_OSSavesZMM = SDL_FALSE
static

Definition at line 257 of file SDL_cpuinfo.c.

Referenced by CPU_calcCPUIDFeatures(), and CPU_haveAVX512F().

◆ SDL_CPUCount

int SDL_CPUCount = 0
static

Definition at line 444 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUCount().

◆ SDL_CPUFeatures

Uint32 SDL_CPUFeatures = 0xFFFFFFFF
static

Definition at line 614 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures().

◆ SDL_SIMDAlignment

Uint32 SDL_SIMDAlignment = 0xFFFFFFFF
static

Definition at line 615 of file SDL_cpuinfo.c.

Referenced by SDL_GetCPUFeatures(), and SDL_SIMDGetAlignment().

◆ SDL_SystemRAM

int SDL_SystemRAM = 0
static

Definition at line 758 of file SDL_cpuinfo.c.

Referenced by SDL_GetSystemRAM().