之例1 (14)t6:=4*1 15)X:=a[t6 (14)t6:=4*1 (16)t7:=4*1 15)x:=al[6 (17)t8:=4*j (17)t8:=4*j (18)9:=a[t8] 优化后 (18)9:=a[t8] (19)at=9 19)at6]:=t9 (20)t10:=4*1 (21)at8]:=x (2 1)a[t10:=X (22)goto(5 (22)goto(5)(14)t6:=4*i (15)x:=a[t6] (16)t7:=4*i (17)t8:=4*j (18)t9:=a[t8] (19)a[t7]:=t9 (20)t10:=4*j (21)a[t10]:=x (22)goto (5) (14)t6:=4*i (15)x:=a[t6] (17)t8:=4*j (18)t9:=a[t8] (19)a[t6]:=t9 (21)a[t8]:=x (22)goto (5) 优化后 例 1