ud- and du-chains

PRODUCERS            INSTRUCTIONS                     CONSUMERS       
                  0: *ENTRY                                           
                  1:     x := *PARAMETER 0            x 9 x 10        
                  2:     n := *PARAMETER 1            n 17            
                  3:     j := 0                       j 11            
                  4:     s := 1.0                     s 15 s 19       
                  5:     t := 1.0                     t 8             
                  6:     i := 0                       i 16            
                  7:     *GOTO _entry                                 
t 5 t 14          8: _loop: a := - t                  a 9             
a 8 x 1           9:     a := a * x                   a 10            
a 9 x 1          10:     a := a * x                   a 12            
j 3 j 13         11:     j := j + 1                   j 12 j 13       
a 10 j 11        12:     a := a / j                   a 14            
j 11             13:     j := j + 1                   j 11 j 14       
a 12 j 13        14:     t := a / j                   t 8 t 15        
s 4 s 15 t 14    15:     s := s + t                   s 15 s 19       
i 6 i 16         16: _entry: i := i + 1               i 16 i 17       
i 16 n 2         17:     a := i < n                   a 18            
a 17             18:     *IF a *GOTO _loop                            
s 4 s 15         19:     *RETURN s