SDL_cpuinfo.c
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/*
Simple DirectMedia Layer
Copyright (C) 1997-2019 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__) || defined(__WINRT__)
#include "../core/windows/SDL_windows.h"
#endif
#if defined(__OS2__)
#define INCL_DOS
#include <os2.h>
#ifndef QSV_NUMPROCESSORS
#define QSV_NUMPROCESSORS 26
#endif
#endif
/* CPU feature detection for SDL */
#include "SDL_cpuinfo.h"
#include "SDL_assert.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
#if defined(__QNXNTO__)
#include <sys/syspage.h>
#endif
#if (defined(__LINUX__) || defined(__ANDROID__)) && defined(__ARM_ARCH)
/*#include <asm/hwcap.h>*/
#ifndef AT_HWCAP
#define AT_HWCAP 16
#endif
#ifndef HWCAP_NEON
#define HWCAP_NEON (1 << 12)
#endif
#if defined HAVE_GETAUXVAL
#include <sys/auxv.h>
#else
#include <fcntl.h>
#endif
#endif
#if defined(__ANDROID__) && defined(__ARM_ARCH) && !defined(HAVE_GETAUXVAL)
#if __ARM_ARCH < 8
#include <cpu-features.h>
#endif
#endif
#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)
#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* */
#ifndef SDL_CPUINFO_DISABLED
#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
#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) \
do { a = b = c = d = 0; (void) a; (void) b; (void) c; (void) d; } while (0)
#endif
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 void
CPU_calcCPUIDFeatures(void)
{
static SDL_bool checked = SDL_FALSE;
if (!checked) {
checked = SDL_TRUE;
if (CPU_haveCPUID()) {
int a, b, c, d;
cpuid(0, a, b, c, d);
CPU_CPUIDMaxFunction = a;
if (CPU_CPUIDMaxFunction >= 1) {
cpuid(1, a, b, c, d);
CPU_CPUIDFeatures[0] = a;
CPU_CPUIDFeatures[1] = b;
CPU_CPUIDFeatures[2] = c;
CPU_CPUIDFeatures[3] = d;
/* Check to make sure we can call xgetbv */
if (c & 0x08000000) {
/* Call xgetbv to see if YMM (etc) register state is saved */
#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
CPU_OSSavesYMM = ((a & 6) == 6) ? SDL_TRUE : SDL_FALSE;
CPU_OSSavesZMM = (CPU_OSSavesYMM && ((a & 0xe0) == 0xe0)) ? SDL_TRUE : SDL_FALSE;
}
}
}
}
}
static int
CPU_haveAltiVec(void)
{
volatile int altivec = 0;
#ifndef SDL_CPUINFO_DISABLED
#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
#endif
return altivec;
}
#if defined(__LINUX__) && defined(__ARM_ARCH) && !defined(HAVE_GETAUXVAL)
static int
readProcAuxvForNeon(void)
{
int neon = 0;
int kv[2];
const int fd = open("/proc/self/auxv", O_RDONLY);
if (fd != -1) {
while (read(fd, kv, sizeof (kv)) == sizeof (kv)) {
if (kv[0] == AT_HWCAP) {
neon = ((kv[1] & HWCAP_NEON) == HWCAP_NEON);
break;
}
}
close(fd);
}
return neon;
}
#endif
static int
CPU_haveNEON(void)
{
/* The way you detect NEON is a privileged instruction on ARM, so you have
query the OS kernel in a platform-specific way. :/ */
#if defined(SDL_CPUINFO_DISABLED)
return 0; /* disabled */
#elif (defined(__WINDOWS__) || defined(__WINRT__)) && (defined(_M_ARM) || defined(_M_ARM64))
/* Visual Studio, for ARM, doesn't define __ARM_ARCH. Handle this first. */
/* Seems to have been removed */
# if !defined(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE)
# define PF_ARM_NEON_INSTRUCTIONS_AVAILABLE 19
# endif
/* All WinRT ARM devices are required to support NEON, but just in case. */
return IsProcessorFeaturePresent(PF_ARM_NEON_INSTRUCTIONS_AVAILABLE) != 0;
#elif !defined(__ARM_ARCH)
return 0; /* not an ARM CPU at all. */
#elif __ARM_ARCH >= 8
return 1; /* ARMv8 always has non-optional NEON support. */
#elif defined(__APPLE__) && (__ARM_ARCH >= 7)
/* (note that sysctlbyname("hw.optional.neon") doesn't work!) */
return 1; /* all Apple ARMv7 chips and later have NEON. */
#elif defined(__APPLE__)
return 0; /* assume anything else from Apple doesn't have NEON. */
#elif defined(__QNXNTO__)
return SYSPAGE_ENTRY(cpuinfo)->flags & ARM_CPU_FLAG_NEON;
#elif (defined(__LINUX__) || defined(__ANDROID__)) && defined(HAVE_GETAUXVAL)
return ((getauxval(AT_HWCAP) & HWCAP_NEON) == HWCAP_NEON);
#elif defined(__LINUX__)
return readProcAuxvForNeon();
#elif defined(__ANDROID__)
/* Use NDK cpufeatures to read either /proc/self/auxv or /proc/cpuinfo */
{
AndroidCpuFamily cpu_family = android_getCpuFamily();
if (cpu_family == ANDROID_CPU_FAMILY_ARM) {
uint64_t cpu_features = android_getCpuFeatures();
if ((cpu_features & ANDROID_CPU_ARM_FEATURE_NEON) != 0) {
return 1;
}
}
return 0;
}
#else
#warning SDL_HasNEON is not implemented for this ARM platform. Write me.
return 0;
#endif
}
static int
CPU_have3DNow(void)
{
if (CPU_CPUIDMaxFunction > 0) { /* that is, do we have CPUID at all? */
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;
}
#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))
static int
CPU_haveAVX2(void)
{
if (CPU_OSSavesYMM && (CPU_CPUIDMaxFunction >= 7)) {
int a, b, c, d;
(void) a; (void) b; (void) c; (void) d; /* compiler warnings... */
cpuid(7, a, b, c, d);
return (b & 0x00000020);
}
return 0;
}
static int
CPU_haveAVX512F(void)
{
if (CPU_OSSavesZMM && (CPU_CPUIDMaxFunction >= 7)) {
int a, b, c, d;
(void) a; (void) b; (void) c; (void) d; /* compiler warnings... */
cpuid(7, a, b, c, d);
return (b & 0x00010000);
}
return 0;
}
static int SDL_CPUCount = 0;
int
SDL_GetCPUCount(void)
{
if (!SDL_CPUCount) {
#ifndef SDL_CPUINFO_DISABLED
#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
#ifdef __OS2__
if (SDL_CPUCount <= 0) {
DosQuerySysInfo(QSV_NUMPROCESSORS, QSV_NUMPROCESSORS,
&SDL_CPUCount, sizeof(SDL_CPUCount) );
}
#endif
#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;
CPU_calcCPUIDFeatures();
if (CPU_CPUIDMaxFunction > 0) { /* do we have CPUID at all? */
int a, b, c, d;
cpuid(0x00000000, a, b, c, d);
(void) a;
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;
CPU_calcCPUIDFeatures();
if (CPU_CPUIDMaxFunction > 0) { /* do we have CPUID at all? */
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();
int a, b, c, d;
(void) a; (void) b; (void) c; (void) d;
if (SDL_strcmp(cpuType, "GenuineIntel") == 0) {
cpuid(0x00000001, a, b, c, d);
return (((b >> 8) & 0xff) * 8);
} else if (SDL_strcmp(cpuType, "AuthenticAMD") == 0) {
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_SIMDAlignment = 0xFFFFFFFF;
static Uint32
SDL_GetCPUFeatures(void)
{
if (SDL_CPUFeatures == 0xFFFFFFFF) {
CPU_calcCPUIDFeatures();
SDL_CPUFeatures = 0;
SDL_SIMDAlignment = 4; /* a good safe base value */
if (CPU_haveRDTSC()) {
SDL_CPUFeatures |= CPU_HAS_RDTSC;
}
if (CPU_haveAltiVec()) {
SDL_CPUFeatures |= CPU_HAS_ALTIVEC;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 16);
}
if (CPU_haveMMX()) {
SDL_CPUFeatures |= CPU_HAS_MMX;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 8);
}
if (CPU_have3DNow()) {
SDL_CPUFeatures |= CPU_HAS_3DNOW;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 8);
}
if (CPU_haveSSE()) {
SDL_CPUFeatures |= CPU_HAS_SSE;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 16);
}
if (CPU_haveSSE2()) {
SDL_CPUFeatures |= CPU_HAS_SSE2;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 16);
}
if (CPU_haveSSE3()) {
SDL_CPUFeatures |= CPU_HAS_SSE3;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 16);
}
if (CPU_haveSSE41()) {
SDL_CPUFeatures |= CPU_HAS_SSE41;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 16);
}
if (CPU_haveSSE42()) {
SDL_CPUFeatures |= CPU_HAS_SSE42;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 16);
}
if (CPU_haveAVX()) {
SDL_CPUFeatures |= CPU_HAS_AVX;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 32);
}
if (CPU_haveAVX2()) {
SDL_CPUFeatures |= CPU_HAS_AVX2;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 32);
}
if (CPU_haveAVX512F()) {
SDL_CPUFeatures |= CPU_HAS_AVX512F;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 64);
}
if (CPU_haveNEON()) {
SDL_CPUFeatures |= CPU_HAS_NEON;
SDL_SIMDAlignment = SDL_max(SDL_SIMDAlignment, 16);
}
}
return SDL_CPUFeatures;
}
#define CPU_FEATURE_AVAILABLE(f) ((SDL_GetCPUFeatures() & f) ? SDL_TRUE : SDL_FALSE)
SDL_bool SDL_HasRDTSC(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_RDTSC);
}
SDL_bool
SDL_HasAltiVec(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_ALTIVEC);
}
SDL_bool
SDL_HasMMX(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_MMX);
}
SDL_bool
SDL_Has3DNow(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_3DNOW);
}
SDL_bool
SDL_HasSSE(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_SSE);
}
SDL_bool
SDL_HasSSE2(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_SSE2);
}
SDL_bool
SDL_HasSSE3(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_SSE3);
}
SDL_bool
SDL_HasSSE41(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_SSE41);
}
SDL_bool
SDL_HasSSE42(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_SSE42);
}
SDL_bool
SDL_HasAVX(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_AVX);
}
SDL_bool
SDL_HasAVX2(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_AVX2);
}
SDL_bool
SDL_HasAVX512F(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_AVX512F);
}
SDL_bool
SDL_HasNEON(void)
{
return CPU_FEATURE_AVAILABLE(CPU_HAS_NEON);
}
static int SDL_SystemRAM = 0;
int
SDL_GetSystemRAM(void)
{
if (!SDL_SystemRAM) {
#ifndef SDL_CPUINFO_DISABLED
#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__) || defined(__NetBSD__)
#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
#ifdef __OS2__
if (SDL_SystemRAM <= 0) {
Uint32 sysram = 0;
DosQuerySysInfo(QSV_TOTPHYSMEM, QSV_TOTPHYSMEM, &sysram, 4);
SDL_SystemRAM = (int) (sysram / 0x100000U);
}
#endif
#endif
}
return SDL_SystemRAM;
}
size_t
SDL_SIMDGetAlignment(void)
{
if (SDL_SIMDAlignment == 0xFFFFFFFF) {
SDL_GetCPUFeatures(); /* make sure this has been calculated */
}
SDL_assert(SDL_SIMDAlignment != 0);
return SDL_SIMDAlignment;
}
void *
SDL_SIMDAlloc(const size_t len)
{
const size_t alignment = SDL_SIMDGetAlignment();
const size_t padding = alignment - (len % alignment);
const size_t padded = (padding != alignment) ? (len + padding) : len;
Uint8 *retval = NULL;
Uint8 *ptr = (Uint8 *) SDL_malloc(padded + alignment + sizeof (void *));
if (ptr) {
/* store the actual malloc pointer right before our aligned pointer. */
retval = ptr + sizeof (void *);
retval += alignment - (((size_t) retval) % alignment);
*(((void **) retval) - 1) = ptr;
}
return retval;
}
void
SDL_SIMDFree(void *ptr)
{
if (ptr) {
void **realptr = (void **) ptr;
realptr--;
SDL_free(*(((void **) ptr) - 1));
}
}
#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("AVX-512F: %d\n", SDL_HasAVX512F());
printf("NEON: %d\n", SDL_HasNEON());
printf("RAM: %d MB\n", SDL_GetSystemRAM());
return 0;
}
#endif /* TEST_MAIN */
/* vi: set ts=4 sw=4 expandtab: */
CPU_haveMMX
#define CPU_haveMMX()
Definition: SDL_cpuinfo.c:412
SDL_HasSSE42
SDL_bool SDL_HasSSE42(void)
Definition: SDL_cpuinfo.c:729
c
const GLubyte * c
Definition: SDL_opengl_glext.h:11093
SDL_CACHELINE_SIZE
#define SDL_CACHELINE_SIZE
Definition: SDL_cpuinfo.h:114
Uint32
uint32_t Uint32
Definition: SDL_stdinc.h:203
CPU_OSSavesZMM
static SDL_bool CPU_OSSavesZMM
Definition: SDL_cpuinfo.c:257
CPU_haveAltiVec
static int CPU_haveAltiVec(void)
Definition: SDL_cpuinfo.c:300
SDL_GetCPUType
static const char * SDL_GetCPUType(void)
Definition: SDL_cpuinfo.c:486
SDL_strlcpy
#define SDL_strlcpy
Definition: SDL_dynapi_overrides.h:394
SDL_HasAVX
SDL_bool SDL_HasAVX(void)
Definition: SDL_cpuinfo.c:735
Sint64
int64_t Sint64
Definition: SDL_stdinc.h:210
SDL_CPUFeatures
static Uint32 SDL_CPUFeatures
Definition: SDL_cpuinfo.c:614
SDL_GetCPUFeatures
static Uint32 SDL_GetCPUFeatures(void)
Definition: SDL_cpuinfo.c:618
CPU_HAS_SSE
#define CPU_HAS_SSE
Definition: SDL_cpuinfo.c:90
in
GLuint in
Definition: SDL_opengl_glext.h:7940
NULL
#define NULL
Definition: begin_code.h:167
b
GLboolean GLboolean GLboolean b
Definition: SDL_opengl_glext.h:1109
CPU_haveAVX
#define CPU_haveAVX()
Definition: SDL_cpuinfo.c:418
CPU_HAS_SSE41
#define CPU_HAS_SSE41
Definition: SDL_cpuinfo.c:93
CPU_HAS_AVX2
#define CPU_HAS_AVX2
Definition: SDL_cpuinfo.c:96
CPU_HAS_ALTIVEC
#define CPU_HAS_ALTIVEC
Definition: SDL_cpuinfo.c:87
SDL_SystemRAM
static int SDL_SystemRAM
Definition: SDL_cpuinfo.c:758
CPU_haveCPUID
static int CPU_haveCPUID(void)
Definition: SDL_cpuinfo.c:113
SDL_HasSSE2
SDL_bool SDL_HasSSE2(void)
Definition: SDL_cpuinfo.c:711
CPU_HAS_3DNOW
#define CPU_HAS_3DNOW
Definition: SDL_cpuinfo.c:89
CPU_FEATURE_AVAILABLE
#define CPU_FEATURE_AVAILABLE(f)
Definition: SDL_cpuinfo.c:679
a
GLboolean GLboolean GLboolean GLboolean a
Definition: SDL_opengl_glext.h:1109
h
GLfloat GLfloat GLfloat GLfloat h
Definition: SDL_opengl_glext.h:1946
length
GLuint GLsizei GLsizei * length
Definition: SDL_opengl_glext.h:669
main
#define main
Definition: SDL_main.h:109
CPU_HAS_NEON
#define CPU_HAS_NEON
Definition: SDL_cpuinfo.c:97
CPU_HAS_SSE42
#define CPU_HAS_SSE42
Definition: SDL_cpuinfo.c:94
SDL_SIMDAlignment
static Uint32 SDL_SIMDAlignment
Definition: SDL_cpuinfo.c:615
CPU_haveSSE
#define CPU_haveSSE()
Definition: SDL_cpuinfo.c:413
len
GLenum GLsizei len
Definition: SDL_opengl_glext.h:2926
SDL_FALSE
@ SDL_FALSE
Definition: SDL_stdinc.h:163
done
int done
Definition: checkkeys.c:28
retval
SDL_bool retval
Definition: testgamecontroller.c:65
SDL_GetCPUCount
int SDL_GetCPUCount(void)
Definition: SDL_cpuinfo.c:447
SDL_GetCPUCacheLineSize
int SDL_GetCPUCacheLineSize(void)
Definition: SDL_cpuinfo.c:597
SDL_free
#define SDL_free
Definition: SDL_dynapi_overrides.h:377
SDL_max
#define SDL_max(x, y)
Definition: SDL_stdinc.h:407
SDL_cpuinfo.h
CPU_HAS_SSE2
#define CPU_HAS_SSE2
Definition: SDL_cpuinfo.c:91
CPU_haveSSE41
#define CPU_haveSSE41()
Definition: SDL_cpuinfo.c:416
SDL_GetSystemRAM
int SDL_GetSystemRAM(void)
Definition: SDL_cpuinfo.c:761
CPU_HAS_RDTSC
#define CPU_HAS_RDTSC
Definition: SDL_cpuinfo.c:86
CPU_HAS_AVX512F
#define CPU_HAS_AVX512F
Definition: SDL_cpuinfo.c:98
SDL_assert.h
CPU_haveNEON
static int CPU_haveNEON(void)
Definition: SDL_cpuinfo.c:350
SDL_SIMDGetAlignment
size_t SDL_SIMDGetAlignment(void)
Report the alignment this system needs for SIMD allocations.
Definition: SDL_cpuinfo.c:813
SDL_HasSSE3
SDL_bool SDL_HasSSE3(void)
Definition: SDL_cpuinfo.c:717
SDL_HasRDTSC
SDL_bool SDL_HasRDTSC(void)
Definition: SDL_cpuinfo.c:681
pop
#define pop
Definition: SDL_qsort.c:192
CPU_HAS_MMX
#define CPU_HAS_MMX
Definition: SDL_cpuinfo.c:88
SDL_SIMDAlloc
void * SDL_SIMDAlloc(const size_t len)
Allocate memory in a SIMD-friendly way.
Definition: SDL_cpuinfo.c:823
SDL_assert
#define SDL_assert(condition)
Definition: SDL_assert.h:169
SDL_Has3DNow
SDL_bool SDL_Has3DNow(void)
Definition: SDL_cpuinfo.c:699
CPU_calcCPUIDFeatures
static void CPU_calcCPUIDFeatures(void)
Definition: SDL_cpuinfo.c:260
size
GLsizeiptr size
Definition: SDL_opengl_glext.h:537
CPU_haveSSE2
#define CPU_haveSSE2()
Definition: SDL_cpuinfo.c:414
SDL_HasAVX512F
SDL_bool SDL_HasAVX512F(void)
Definition: SDL_cpuinfo.c:747
SDL_TRUE
@ SDL_TRUE
Definition: SDL_stdinc.h:164
value
GLsizei const GLfloat * value
Definition: SDL_opengl_glext.h:698
CPU_CPUIDFeatures
static int CPU_CPUIDFeatures[4]
Definition: SDL_cpuinfo.c:254
Uint64
uint64_t Uint64
Definition: SDL_stdinc.h:216
CPU_haveSSE42
#define CPU_haveSSE42()
Definition: SDL_cpuinfo.c:417
CPU_OSSavesYMM
static SDL_bool CPU_OSSavesYMM
Definition: SDL_cpuinfo.c:256
CPU_HAS_SSE3
#define CPU_HAS_SSE3
Definition: SDL_cpuinfo.c:92
CPU_have3DNow
static int CPU_have3DNow(void)
Definition: SDL_cpuinfo.c:398
SDL_HasSSE41
SDL_bool SDL_HasSSE41(void)
Definition: SDL_cpuinfo.c:723
SDL_HasAltiVec
SDL_bool SDL_HasAltiVec(void)
Definition: SDL_cpuinfo.c:687
SDL_HasMMX
SDL_bool SDL_HasMMX(void)
Definition: SDL_cpuinfo.c:693
SDL_HasNEON
SDL_bool SDL_HasNEON(void)
Definition: SDL_cpuinfo.c:753
size_t
unsigned int size_t
Definition: SDL_config_windows.h:68
SDL_HasAVX2
SDL_bool SDL_HasAVX2(void)
Definition: SDL_cpuinfo.c:741
cpuid
#define cpuid(func, a, b, c, d)
Definition: SDL_cpuinfo.c:250
CPU_haveAVX512F
static int CPU_haveAVX512F(void)
Definition: SDL_cpuinfo.c:433
CPU_HAS_AVX
#define CPU_HAS_AVX
Definition: SDL_cpuinfo.c:95
SDL_malloc
#define SDL_malloc
Definition: SDL_dynapi_overrides.h:374
SDL_strcmp
#define SDL_strcmp
Definition: SDL_dynapi_overrides.h:417
fd
GLuint64 GLenum GLint fd
Definition: gl2ext.h:1508
void
const SDL_PRINTF_FORMAT_STRING char int const SDL_PRINTF_FORMAT_STRING char int const SDL_PRINTF_FORMAT_STRING char int const SDL_PRINTF_FORMAT_STRING char const char const SDL_SCANF_FORMAT_STRING char return SDL_ThreadFunction const char void return Uint32 return Uint32 void
Definition: SDL_dynapi_procs.h:89
SDL_HasSSE
SDL_bool SDL_HasSSE(void)
Definition: SDL_cpuinfo.c:705
SDL_SIMDFree
void SDL_SIMDFree(void *ptr)
Deallocate memory obtained from SDL_SIMDAlloc.
Definition: SDL_cpuinfo.c:840
CPU_haveAVX2
static int CPU_haveAVX2(void)
Definition: SDL_cpuinfo.c:421
uint64_t
unsigned long long uint64_t
Definition: SDL_config_windows.h:65
i
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
CPU_CPUIDMaxFunction
static int CPU_CPUIDMaxFunction
Definition: SDL_cpuinfo.c:255
CPU_haveSSE3
#define CPU_haveSSE3()
Definition: SDL_cpuinfo.c:415
d
const SDL_PRINTF_FORMAT_STRING char int const SDL_PRINTF_FORMAT_STRING char int const SDL_PRINTF_FORMAT_STRING char int const SDL_PRINTF_FORMAT_STRING char const char const SDL_SCANF_FORMAT_STRING 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
Definition: SDL_dynapi_procs.h:117
SDL_bool
SDL_bool
Definition: SDL_stdinc.h:161
SDL_CPUCount
static int SDL_CPUCount
Definition: SDL_cpuinfo.c:444
CPU_haveRDTSC
#define CPU_haveRDTSC()
Definition: SDL_cpuinfo.c:411
Uint8
uint8_t Uint8
Definition: SDL_stdinc.h:179