725     struct slist *next, *last;  local
732     last = s;
749         last = next;
863         if (last->s.code == (BPF_ALU | BPF_SUB | BPF_X))
878                 last->s.code = NOP;
892                 last->s.code = NOP;
903         else if (last->s.code == (BPF_ALU | BPF_SUB | BPF_K))
905             last->s.code = NOP;
906             b->s.k += last->s.k;
916         else if (last->s.code == (BPF_ALU | BPF_AND | BPF_K) && b->s.k == 0)
918             b->s.k = last->s.k;
920             last->s.code = NOP;
1192 static void deadstmt(s, last)  in deadstmt()  argument
1194      register struct stmt *last[];
1203             last[X_ATOM] = 0;
1204             last[A_ATOM] = 0;
1207             last[atom] = 0;
1212         if (last[atom])
1215             last[atom]->code = NOP;
1217         last[atom] = s;
1226     struct stmt *last[N_ATOMS];  local
1228     memset((char *) last, 0, sizeof last);
1231         deadstmt(&s->s, last);
1232     deadstmt(&b->s, last);
1235         if (last[atom] && !ATOMELEM(b->out_use, atom))
1237             last[atom]->code = NOP;