466   struct df_link *ref_chain, *ref_link;  in get_defs()  local
480   for (ref_link = ref_chain; ref_link; ref_link = ref_link->next)  in get_defs()
483       if (ref_link->ref == NULL)  in get_defs()
485       if (DF_REF_INSN_INFO (ref_link->ref) == NULL)  in get_defs()
493 	  && !set_of (reg, DF_REF_INSN (ref_link->ref)))  in get_defs()
498     for (ref_link = ref_chain; ref_link; ref_link = ref_link->next)  in get_defs()
499       dest->safe_push (DF_REF_INSN (ref_link->ref));  in get_defs()
511   struct df_link *ref_chain, *ref_link;  in get_uses()  local
521   for (ref_link = ref_chain; ref_link; ref_link = ref_link->next)  in get_uses()
524       if (ref_link->ref == NULL)  in get_uses()
526       if (DF_REF_CLASS (ref_link->ref) != DF_REF_REGULAR)  in get_uses()
1174 		struct df_link *ref_chain, *ref_link;  in add_removable_extension()  local
1177 		for (ref_link = ref_chain; ref_link; ref_link = ref_link->next)  in add_removable_extension()
1179 		    if (ref_link->ref == NULL  in add_removable_extension()
1180 			|| DF_REF_INSN_INFO (ref_link->ref) == NULL)  in add_removable_extension()
1185 		    rtx_insn *use_insn = DF_REF_INSN (ref_link->ref);  in add_removable_extension()