Can I replace my if-statements to save running time?

I am currently trying to improve the speed of my program.

I was wondering whether it would help to replace all if-statements of the type:

bool a=1;
int b=0;
if(a){b++;}

with this:

bool a=1;
int b=0;

b+=a;

I am unsure whether the conversion from bool to int could be a problem time-wise.