! equiv c code:
! int x = 0;
! while(x < 20) {
!   /* statements */
! }

!
! Unoptimzed:
!
    clr %l0
loop:
    cmp %l0, 20
    bge :end_loop
    nop

    /* statements */

    ba loop
    nop
end_loop:

!
! Optimized:
!
    clr %l0

    cmp %l0, 20
    bge end_loop
    nop
loop:
    /* statements */
    cmp %l0, 20
    bl loop
    nop

end_loop: