How Can I Reliably Determine SSE3 Instruction Set Support on Windows XP?

Checking CPU Support for SSE3

Problem:

Determining CPU support for the SSE3 instruction set using the IsProcessorFeaturePresent() function is unreliable on Windows XP.

Solution: Alternate Approach

Here's an alternative method for checking SSE3 support:

• Utilize the cpuid() instruction to access CPU information.
• Check bit 0 of the second element of the returned info array.
• If the bit is set, the CPU supports SSE3.

Code Example:

#include <cpuid.h>

bool CheckSSE3()
{
    int CPUInfo[4];

    __cpuid_count(0, 0, CPUInfo[0], CPUInfo[1], CPUInfo[2], CPUInfo[3]);

    if (CPUInfo[0] >= 1)
    {
        __cpuid_count(1, 0, CPUInfo[0], CPUInfo[1], CPUInfo[2], CPUInfo[3]);
        bool bSSE3NewInstructions = (CPUInfo[2] & 0x1) || false;
        return bSSE3NewInstructions;
    }

    return false;
}

Additional Notes:

• This method works for Windows XP and later operating systems.
• It's recommended to check for OS support as well, as some instructions require specific operating system versions.

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