Check SSE/AVX instruction support.

ssecheck.cpp

/*
	Check SSE/AVX support.
	This application can detect the instruction support of
	SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, SSE4a, SSE5, and AVX.
*/

#include <iostream>
#ifdef _MSC_VER
#include <intrin.h>
#endif

#ifdef __GNUC__

void __cpuid(int* cpuinfo, int info)
{
	__asm__ __volatile__(
		"xchg %%ebx, %%edi;"
		"cpuid;"
		"xchg %%ebx, %%edi;"
		:"=a" (cpuinfo[0]), "=D" (cpuinfo[1]), "=c" (cpuinfo[2]), "=d" (cpuinfo[3])
		:"0" (info)
	);
}

unsigned long long _xgetbv(unsigned int index)
{
	unsigned int eax, edx;
	__asm__ __volatile__(
		"xgetbv;"
		: "=a" (eax), "=d"(edx)
		: "c" (index)
	);
	return ((unsigned long long)edx << 32) | eax;
}

#endif

int main()
{
	bool sseSupportted = false;
	bool sse2Supportted = false;
	bool sse3Supportted = false;
	bool ssse3Supportted = false;
	bool sse4_1Supportted = false;
	bool sse4_2Supportted = false;
	bool sse4aSupportted = false;
	bool sse5Supportted = false;
	bool avxSupportted = false;

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

	// Check SSE, SSE2, SSE3, SSSE3, SSE4.1, and SSE4.2 support
	sseSupportted		= cpuinfo[3] & (1 << 25) || false;
	sse2Supportted		= cpuinfo[3] & (1 << 26) || false;
	sse3Supportted		= cpuinfo[2] & (1 << 0) || false;
	ssse3Supportted		= cpuinfo[2] & (1 << 9) || false;
	sse4_1Supportted	= cpuinfo[2] & (1 << 19) || false;
	sse4_2Supportted	= cpuinfo[2] & (1 << 20) || false;
	
	// ----------------------------------------------------------------------

	// Check AVX support
	// References
	// http://software.intel.com/en-us/blogs/2011/04/14/is-avx-enabled/
	// http://insufficientlycomplicated.wordpress.com/2011/11/07/detecting-intel-advanced-vector-extensions-avx-in-visual-studio/
	
	avxSupportted = cpuinfo[2] & (1 << 28) || false;
	bool osxsaveSupported = cpuinfo[2] & (1 << 27) || false;
	if (osxsaveSupported && avxSupportted)
	{
		// _XCR_XFEATURE_ENABLED_MASK = 0
		unsigned long long xcrFeatureMask = _xgetbv(0);
		avxSupportted = (xcrFeatureMask & 0x6) == 0x6;
	}

	// ----------------------------------------------------------------------

	// Check SSE4a and SSE5 support

	// Get the number of valid extended IDs
	__cpuid(cpuinfo, 0x80000000);
	int numExtendedIds = cpuinfo[0];
	if (numExtendedIds >= 0x80000001)
	{
		__cpuid(cpuinfo, 0x80000001);
		sse4aSupportted = cpuinfo[2] & (1 << 6) || false;
		sse5Supportted = cpuinfo[2] & (1 << 11) || false;
	}

	// ----------------------------------------------------------------------

	std::cout << "SSE:" << (sseSupportted ? 1 : 0) << std::endl;
	std::cout << "SSE2:" << (sse2Supportted ? 1 : 0) << std::endl;
	std::cout << "SSE3:" << (sse3Supportted ? 1 : 0) << std::endl;
	std::cout << "SSE4.1:" << (sse4_1Supportted ? 1 : 0) << std::endl;
	std::cout << "SSE4.2:" << (sse4_2Supportted ? 1 : 0) << std::endl;
	std::cout << "SSE4a:" << (sse4aSupportted ? 1 : 0) << std::endl;
	std::cout << "SSE5:" << (sse5Supportted ? 1 : 0) << std::endl;
	std::cout << "AVX:" << (avxSupportted ? 1 : 0) << std::endl;

	return 0;
}

@Coldsteel48 the point of CPUID is to provide a standard method to describe a processor, so yes, as long as no software disabling is involved, this will work on AMD.

@MockbaTheBorg technically, yes, it can be expanded to check for this too.

Thank you so much, this is amazing.

Really nice work, thank you!

The ssse3Supportted are not displayed after assigning its value. You declared 9 variables but there are only 8 results.

sse3 and ssse3 are not same.