CPU가 SSE3 명령 세트를 지원하는지 확인하는 방법은 무엇입니까?

CPU가 SSE3 명령 세트를 지원하는지 확인하는 방법은 무엇입니까?

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다음 코드는 CPU가 SSE3 명령어 세트를 지원하는지 확인하는 데 유효합니까?

이 IsProcessorFeaturePresent()기능을 사용하는 것은 Windows XP에서 작동하지 않는 것 같습니다 ( http://msdn.microsoft.com/en-us/library/ms724482(v=vs.85).aspx 참조 ).

bool CheckSSE3()
{
    int CPUInfo[4] = {-1};

    //-- Get number of valid info ids
    __cpuid(CPUInfo, 0);
    int nIds = CPUInfo[0];

    //-- Get info for id "1"
    if (nIds >= 1)
    {
        __cpuid(CPUInfo, 1);
        bool bSSE3NewInstructions = (CPUInfo[2] & 0x1) || false;
        return bSSE3NewInstructions;     
    }

    return false;      
}

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모든 주요 x86 ISA 확장에 대한 CPU 및 OS 지원을 감지하는 GitHub 재현을 만들었습니다. https://github.com/Mysticial/FeatureDetector

다음은 더 짧은 버전입니다.

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먼저 CPUID 명령어에 액세스해야합니다.

#ifdef _WIN32

//  Windows
#define cpuid(info, x)    __cpuidex(info, x, 0)

#else

//  GCC Intrinsics
#include <cpuid.h>
void cpuid(int info[4], int InfoType){
    __cpuid_count(InfoType, 0, info[0], info[1], info[2], info[3]);
}

#endif

그런 다음 다음 코드를 실행할 수 있습니다.

//  Misc.
bool HW_MMX;
bool HW_x64;
bool HW_ABM;      // Advanced Bit Manipulation
bool HW_RDRAND;
bool HW_BMI1;
bool HW_BMI2;
bool HW_ADX;
bool HW_PREFETCHWT1;

//  SIMD: 128-bit
bool HW_SSE;
bool HW_SSE2;
bool HW_SSE3;
bool HW_SSSE3;
bool HW_SSE41;
bool HW_SSE42;
bool HW_SSE4a;
bool HW_AES;
bool HW_SHA;

//  SIMD: 256-bit
bool HW_AVX;
bool HW_XOP;
bool HW_FMA3;
bool HW_FMA4;
bool HW_AVX2;

//  SIMD: 512-bit
bool HW_AVX512F;    //  AVX512 Foundation
bool HW_AVX512CD;   //  AVX512 Conflict Detection
bool HW_AVX512PF;   //  AVX512 Prefetch
bool HW_AVX512ER;   //  AVX512 Exponential + Reciprocal
bool HW_AVX512VL;   //  AVX512 Vector Length Extensions
bool HW_AVX512BW;   //  AVX512 Byte + Word
bool HW_AVX512DQ;   //  AVX512 Doubleword + Quadword
bool HW_AVX512IFMA; //  AVX512 Integer 52-bit Fused Multiply-Add
bool HW_AVX512VBMI; //  AVX512 Vector Byte Manipulation Instructions

int info[4];
cpuid(info, 0);
int nIds = info[0];

cpuid(info, 0x80000000);
unsigned nExIds = info[0];

//  Detect Features
if (nIds >= 0x00000001){
    cpuid(info,0x00000001);
    HW_MMX    = (info[3] & ((int)1 << 23)) != 0;
    HW_SSE    = (info[3] & ((int)1 << 25)) != 0;
    HW_SSE2   = (info[3] & ((int)1 << 26)) != 0;
    HW_SSE3   = (info[2] & ((int)1 <<  0)) != 0;

    HW_SSSE3  = (info[2] & ((int)1 <<  9)) != 0;
    HW_SSE41  = (info[2] & ((int)1 << 19)) != 0;
    HW_SSE42  = (info[2] & ((int)1 << 20)) != 0;
    HW_AES    = (info[2] & ((int)1 << 25)) != 0;

    HW_AVX    = (info[2] & ((int)1 << 28)) != 0;
    HW_FMA3   = (info[2] & ((int)1 << 12)) != 0;

    HW_RDRAND = (info[2] & ((int)1 << 30)) != 0;
}
if (nIds >= 0x00000007){
    cpuid(info,0x00000007);
    HW_AVX2   = (info[1] & ((int)1 <<  5)) != 0;

    HW_BMI1        = (info[1] & ((int)1 <<  3)) != 0;
    HW_BMI2        = (info[1] & ((int)1 <<  8)) != 0;
    HW_ADX         = (info[1] & ((int)1 << 19)) != 0;
    HW_SHA         = (info[1] & ((int)1 << 29)) != 0;
    HW_PREFETCHWT1 = (info[2] & ((int)1 <<  0)) != 0;

    HW_AVX512F     = (info[1] & ((int)1 << 16)) != 0;
    HW_AVX512CD    = (info[1] & ((int)1 << 28)) != 0;
    HW_AVX512PF    = (info[1] & ((int)1 << 26)) != 0;
    HW_AVX512ER    = (info[1] & ((int)1 << 27)) != 0;
    HW_AVX512VL    = (info[1] & ((int)1 << 31)) != 0;
    HW_AVX512BW    = (info[1] & ((int)1 << 30)) != 0;
    HW_AVX512DQ    = (info[1] & ((int)1 << 17)) != 0;
    HW_AVX512IFMA  = (info[1] & ((int)1 << 21)) != 0;
    HW_AVX512VBMI  = (info[2] & ((int)1 <<  1)) != 0;
}
if (nExIds >= 0x80000001){
    cpuid(info,0x80000001);
    HW_x64   = (info[3] & ((int)1 << 29)) != 0;
    HW_ABM   = (info[2] & ((int)1 <<  5)) != 0;
    HW_SSE4a = (info[2] & ((int)1 <<  6)) != 0;
    HW_FMA4  = (info[2] & ((int)1 << 16)) != 0;
    HW_XOP   = (info[2] & ((int)1 << 11)) != 0;
}

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이것은 CPU가 명령을 지원하는지 여부 만 감지합니다. 실제로 실행하려면 운영 체제도 지원해야합니다.

특히 다음과 같은 경우 운영 체제 지원이 필요합니다.

• x64 지침. (64 비트 OS가 필요합니다.)
• Instructions that use the (AVX) 256-bit ymm registers. See Andy Lutomirski's answer for how to detect this.
• Instructions that use the (AVX512) 512-bit zmm and mask registers. Detecting OS support for AVX512 is the same as with AVX, but using the flag 0xe6 instead of 0x6.

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Mysticial's answer is a bit dangerous -- it explains how to detect CPU support but not OS support. You need to use _xgetbv to check whether the OS has enabled the required CPU extended state. See here for another source. Even gcc has made the same mistake. The meat of the code is:

bool avxSupported = false;

int cpuInfo[4];
__cpuid(cpuInfo, 1);

bool osUsesXSAVE_XRSTORE = cpuInfo[2] & (1 << 27) || false;
bool cpuAVXSuport = cpuInfo[2] & (1 << 28) || false;

if (osUsesXSAVE_XRSTORE && cpuAVXSuport)
{
    unsigned long long xcrFeatureMask = _xgetbv(_XCR_XFEATURE_ENABLED_MASK);
    avxSupported = (xcrFeatureMask & 0x6) == 0x6;
}

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After quite a bit of googling, I also found the solutions from Intel:

Link: https://software.intel.com/en-us/articles/how-to-detect-new-instruction-support-in-the-4th-generation-intel-core-processor-family

    void cpuid(uint32_t eax, uint32_t ecx, uint32_t* abcd) {
#if defined(_MSC_VER)
            __cpuidex((int*)abcd, eax, ecx);
#else
            uint32_t ebx, edx;
# if defined( __i386__ ) && defined ( __PIC__ )
            /* in case of PIC under 32-bit EBX cannot be clobbered */
            __asm__("movl %%ebx, %%edi \n\t cpuid \n\t xchgl %%ebx, %%edi" : "=D" (ebx),
# else
            __asm__("cpuid" : "+b" (ebx),
# endif
            "+a" (eax), "+c" (ecx), "=d" (edx));
            abcd[0] = eax; abcd[1] = ebx; abcd[2] = ecx; abcd[3] = edx;
#endif
    }

    int check_xcr0_ymm()
    {
        uint32_t xcr0;
#if defined(_MSC_VER)
        xcr0 = (uint32_t)_xgetbv(0);  /* min VS2010 SP1 compiler is required */
#else
        __asm__("xgetbv" : "=a" (xcr0) : "c" (0) : "%edx");
#endif
        return ((xcr0 & 6) == 6); /* checking if xmm and ymm state are enabled in XCR0 */
    }

Also note that GCC has some special intrinsics that you can use (see: https://gcc.gnu.org/onlinedocs/gcc-4.9.2/gcc/X86-Built-in-Functions.html ):

    if (__builtin_cpu_supports("avx2"))
    // ...

If you put this together with the information above, it'll all work out fine.

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On a Mac OS this works:

sysctl -a | grep machdep.cpu.features

In my machine it outputs this:

machdep.cpu.features: FPU VME DE PSE TSC MSR PAE MCE CX8 APIC SEP MTRR PGE MCA CMOV PAT PSE36 CLFSH DS ACPI MMX FXSR SSE SSE2 SS HTT TM PBE SSE3 PCLMULQDQ DTES64 MON DSCPL VMX EST TM2 SSSE3 FMA CX16 TPR PDCM SSE4.1 SSE4.2 x2APIC MOVBE POPCNT AES PCID XSAVE OSXSAVE SEGLIM64 TSCTMR AVX1.0 RDRAND F16C

As you can see with the instructions written in bold, SSE3 and bunch of other SIMD instructions are supported.

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To add to Abhiroop's answer: On linux, you can run this shell command to find out the features supported by your CPU

cat /proc/cpuinfo | grep flags | uniq

On my machine this prints

flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx pdpe1gb rdtscp lm constant_tsc rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni pclmulqdq ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt tsc_deadline_timer aes xsave avx f16c rdrand hypervisor lahf_lm abm 3dnowprefetch invpcid_single retpoline kaiser fsgsbase bmi1 hle avx2 smep bmi2 erms invpcid rtm rdseed adx xsaveopt

참고URL : https://stackoverflow.com/questions/6121792/how-to-check-if-a-cpu-supports-the-sse3-instruction-set