ランタイム時にSSEのサポート情報を確認しとく

main.cpp

#include <stdio.h>
#include <string.h>

#if defined(_MSC_VER)
#include <intrin.h>
#define CALL_CPUID( dst, paramID ) __cpuidex( dst, paramID, 0 )
#else
#define CALL_CPUID( dst, paramID ) XXX::cpuid( dst, paramID )
namespace XXX
{
    void cpuid( int dst[4], int paramID )
    {
        __asm__ __volatile__
        (
         "cpuid"
         : "=a" (dst[0]), "=b" (dst[1]), "=c" (dst[2]), "=d" (dst[3])
         : "a" (paramID), "c" (0)
        );
    }
}
#endif

int main()
{
    int cpuInfo[4];
    CALL_CPUID( cpuInfo, 0 );
    const int highestValidInfoID = cpuInfo[0];

	int info1_ECX = 0;
	int info1_EDX = 0;
	int info7_EBX = 0;
 
    if( highestValidInfoID >= 1 )
    {
        CALL_CPUID( cpuInfo, 1 );
        info1_ECX = cpuInfo[2];
        info1_EDX = cpuInfo[3];
	}
    
    if( highestValidInfoID >= 7 )
    {
        CALL_CPUID( cpuInfo, 7 );
        info7_EBX = cpuInfo[1];
	}
        
    if( (info1_EDX & (1 << 25)) != 0 ) printf( "SSE   supported\n" );
    if( (info1_EDX & (1 << 26)) != 0 ) printf( "SSE2  supported\n" );
    if( (info1_ECX & (1 <<  0)) != 0 ) printf( "SSE3  supported\n" );
    if( (info1_ECX & (1 << 19)) != 0 ) printf( "SSE41 supported\n" );
    if( (info1_ECX & (1 << 20)) != 0 ) printf( "SSE42 supported\n" );
    if( (info1_ECX & (1 << 28)) != 0 ) printf( "AVX   supported\n" );
    if( (info7_EBX & (1 <<  5)) != 0 ) printf( "AVX2  supported\n" );
}

参照：
https://msdn.microsoft.com/ja-jp/library/vstudio/hskdteyh%28v=vs.120%29.aspx
http://www.intel.co.jp/content/dam/www/public/ijkk/jp/ja/documents/developer/Processor_Identification_071405_i.pdf