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x86 Assembly: How to Check for SSE4.1 Support

An example of how to check if a processor supports the SSE4.1 instruction set

This assembly code was compiled with MS Visual C++ Express Edition 2005 using the MACRO ASSEMBLER for MS Visual C++ Express Edition 2005.

This example is from the SSE/SSE2 tutorial.

TITLE 'extern "C" int __cdecl isSSE41();'
.686P
.model FLAT
PUBLIC	_isSSE41
_TEXT	SEGMENT
_isSSE41 PROC NEAR

	push ebx
	
	mov eax, 1
	cpuid
	shr ecx, 19 ; bit 19 of the ecx register
	and ecx, 1
	mov eax, ecx

	pop ebx

	ret 0
_isSSE41 ENDP
_TEXT	ENDS
END

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