469     int atom;  local
475         atom = atomuse(&s->s);
476         if (atom >= 0)
478             if (atom == AX_ATOM)
485             else if (atom < N_ATOMS)
487                 if (!ATOMELEM(def, atom))
488                     use |= ATOMMASK(atom);
493         atom = atomdef(&s->s);
494         if (atom >= 0)
496             if (!ATOMELEM(use, atom))
497                 kill |= ATOMMASK(atom);
498             def |= ATOMMASK(atom);
506         atom = atomuse(&b->s);
507         if (atom >= 0)
509             if (atom == AX_ATOM)
516             else if (atom < N_ATOMS)
518                 if (!ATOMELEM(def, atom))
519                     use |= ATOMMASK(atom);
1196     register int atom;  local
1198     atom = atomuse(s);
1199     if (atom >= 0)
1201         if (atom == AX_ATOM)
1207             last[atom] = 0;
1209     atom = atomdef(s);
1210     if (atom >= 0)
1212         if (last[atom])
1215             last[atom]->code = NOP;
1217         last[atom] = s;
1225     register int atom;  local
1234     for (atom = 0; atom < N_ATOMS; ++atom)
1235         if (last[atom] && !ATOMELEM(b->out_use, atom))
1237             last[atom]->code = NOP;
1358     int atom;  local
1364     for (atom = 0; atom < N_ATOMS; ++atom)
1365         if (ATOMELEM(use, atom))
1366             if (b->val[atom] != succ->val[atom])