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References

tools/polly/lib/External/isl/isl_tab.c
 3676 	struct isl_tab_var *var = var_from_index(tab, undo->u.var_index);
 3682 		if (!var->is_row || var->index != tab->n_redundant - 1)
 3683 			isl_die(isl_tab_get_ctx(tab), isl_error_internal,
 3686 		return restore_last_redundant(tab);
 3693 			tab->n_dead--;
 3697 			isl_assert(tab->mat->ctx, !var->is_row,
 3699 			return drop_col(tab, var->index);
 3702 			if (!max_is_manifestly_unbounded(tab, var)) {
 3703 				if (to_row(tab, var, 1) < 0)
 3705 			} else if (!min_is_manifestly_unbounded(tab, var)) {
 3706 				if (to_row(tab, var, -1) < 0)
 3709 				if (to_row(tab, var, 0) < 0)
 3712 		return drop_row(tab, var->index);
 3714 		return unrelax(tab, var);
 3716 		return ununrestrict(tab, var);
 3718 		isl_die(tab->mat->ctx, isl_error_internal,