275 	struct isl_tab_undo *snap;  in can_select()  local
286 	snap = isl_tab_snap(tab);  in can_select()
291 		if (isl_tab_rollback(tab, snap) < 0)  in can_select()
311 			if (isl_tab_rollback(tab, snap) < 0)  in can_select()
384 	struct isl_tab_undo **snap = NULL;  in isl_basic_set_compute_vertices()  local
426 	snap = isl_alloc_array(bset->ctx, struct isl_tab_undo *, bset->n_ineq);  in isl_basic_set_compute_vertices()
428 	if ((bset->n_ineq && (!selection || !snap)) || !facets)  in isl_basic_set_compute_vertices()
444 			snap[level] = isl_tab_snap(tab);  in isl_basic_set_compute_vertices()
457 			if (isl_tab_rollback(tab, snap[level]) < 0)  in isl_basic_set_compute_vertices()
477 	free(snap);  in isl_basic_set_compute_vertices()
490 	free(snap);  in isl_basic_set_compute_vertices()
571 	struct isl_tab_undo *snap;  in can_intersect()  local
581 	snap = isl_tab_snap(tab);  in can_intersect()
598 		if (isl_tab_rollback(tab, snap) < 0)  in can_intersect()
612 	struct isl_tab_undo *snap;  in add_chamber()  local
619 	snap = isl_tab_snap(tab);  in add_chamber()
657 	if (isl_tab_rollback(tab, snap) < 0)  in add_chamber()
691 	struct isl_tab_undo *snap;  in create_todo()  local
694 	snap = isl_tab_snap(tab);  in create_todo()
727 	if (isl_tab_rollback(tab, snap) < 0)  in create_todo()
742 	struct isl_tab_undo *snap;  in init_todo()  local
745 	snap = isl_tab_snap(tab);  in init_todo()
763 		if (isl_tab_rollback(tab, snap) < 0)  in init_todo()
800 	struct isl_tab_undo *snap;  in update_todo()  local
803 	snap = isl_tab_snap(tab);  in update_todo()
831 		if (isl_tab_rollback(tab, snap) < 0)  in update_todo()
867 	struct isl_tab_undo *snap;  in compute_chambers()  local
891 	snap = isl_tab_snap(tab);  in compute_chambers()
919 		if (isl_tab_rollback(tab, snap) < 0)  in compute_chambers()