i:=m-1 T1:=4*n v: =aT B ii> Fj goto B」B i:=i+1 I2:=4 X: -a 5/x:a/T, B T3:=a[T2 T,:=T if T3<v goto B 2 13 9 a a T,=to 14·-a113 a Tml=T T a T4:=4 goto B if Ts>v goto B3 删除公用子表达式后❑删除公用子表达式后 i:=m-1 j:=n T1 :=4*n v:=a[T1 ] B1 i:=i+1 T2 :=4*i T3 :=a[T2 ] if T3<v goto B2 B2 j:=j-1 T4 :=4*j T5 :=a[T4 ] if T5>v goto B3 B3 if i>=j goto B6 B4 T6 := T2 x:=a [T6 ] T7 := T6 T8 := T4 T9 :=a [T8 ] a [T7 ]=T9 T10:= T8 a [T10]=x goto B2 B5 T11:= T2 x:=a [T11] T12:= T11 T13:= T1 T14:=a [T13] a [T12]=T14 T15:= T13 a [T15]=x B6