Thread: asm bsf statement

  1. #1
    l'Anziano DavidP's Avatar
    Join Date
    Aug 2001
    Plano, Texas, United States

    Question asm bsf statement

    has anybody here used the assembly statement bsf?

    I am looking at optimizing my gravity and collision detection code, and I was thinking of using bsf to loop through my variables and find the first set bit.

    but then I tried using bsf in just a little sample piece of code and I could not get it to work using inline assembler. Has anybody in here used it before? I would like to see its usage in inline asm...
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  2. #2
    S­énior Member
    Join Date
    Jan 2002
    No, but you may need to state the compiler you're using as they all seem to handle inline asm slightly differently. This works on MSVC -

    #include <iostream> 
    using namespace std; 
    int main() 
    	int a = 4,b=0;
    	_asm {
    		bsf eax,a
    		mov b,eax
    	cout << b; 
    	return 0;

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