Is the Provided Code Sufficient for Checking SSE3 Support on CPUs?

Checking SSE3 Support on CPUs

The Question

Is the following code sufficient to verify if a CPU supports the SSE3 instruction set?

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;      
}

The Answer

Unfortunately, the provided code snippet has a limitation on Windows XP. To overcome this and ensure accurate detection of SSE3 support across a wider range of systems, a more comprehensive solution is recommended.

Below is an approach that provides reliable SSE3 detection on both Windows XP and other operating systems:

// Access CPUID instruction
#ifdef _WIN32
#define cpuid(info, x)    __cpuidex(info, x, 0)
#else
#include <cpuid.h>
void cpuid(int info[4], int InfoType){
    __cpuid_count(InfoType, 0, info[0], info[1], info[2], info[3]);
}
#endif

// Detect SSE3 support
bool HW_SSE3;
int info[4];
cpuid(info, 0);
int nIds = info[0];
if (nIds >= 0x00000001){
    cpuid(info,0x00000001);
    HW_SSE3   = (info[2] &amp; ((int)1 <<  0)) != 0;
}

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