pushl %ebp
movl %esp,%ebp
#i've to do ((X/2)*K1)
movl %ebx,-12(%ebp) #X to stack
movl $2,-8(%ebp) #2 to stack
movl K1,%eax
movl %eax,-4(%ebp) #K1 to stack
fildl -12(%ebp)
fildl -8(%ebp)
fildl -4(%ebp)
fdivp %st(0),%st(1) #X/2
fmulp %st(0),%st(1) #(X/2)*K1
fist -4(%ebp)
movl -4(%ebp),%eax #result to eax casted as int
popl %ebp
ret