en the leading K-by-(N-P+1)*K /
          (N-P+1)*K-by-K part of this array must contain the
          nonzero blocks of the last block row / column in the
          ICC factor from a previous call of this routine. Note that
          this part is identical with the positive generator of
          the Schur complement of the leading P*K-by-P*K part in T.
          If P = 0, then R is only an output parameter.
          On exit, if INFO = 0 and P = 0, then the leading
          S*K-by-N*K / N*K-by-S*K part o