PROWAREtech
x86 Assembly: How to Check for MMX Support
An example of how to check if a processor supports the MMX 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 isMMX();'
.686P
.model FLAT
PUBLIC _isMMX
_TEXT SEGMENT
_isMMX PROC NEAR
push ebx
mov eax, 1
cpuid
shr edx, 23 ; bit 23 of the edx register
and edx, 1
mov eax, edx
pop ebx
ret 0
_isMMX ENDP
_TEXT ENDS
END
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