asm bsf statement

[DavidP]

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...

[Sorensen]

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;

}