C Code:

int main(int argc,char **argv) { long x=1,y=2,z=3; z = top(x,y); return z; } long top(long x,long y) { x = x + y; return leaf(x,y); } long leaf(long y,long z) { z = y - z; return z; }

Assembly:

Please explain the %rdi %rsi %rax %rsp part as i already understand the others , thanks in advance !

Fill the table with appropriate values right before the instruction executes, not after the instruction finished executing. Instructions are dependent and values may change as instrucitons execute