code: public static int cusolverDnSormtr_bufferSize(
          cusolverDnHandle handle, 
          int side, 
          int uplo, 
          int trans, 
          int m, 
          int n, 
          Pointer A, 
          int lda, 
          Pointer tau, 
          Pointer C, 
          int ldc, 
          int[] lwork)
      {
          return checkResult(cusolverDnSormtr_bufferSizeNative(handle, side, uplo, trans, m, n, A, lda, tau, C, ldc, lwork));
      }
docs: compute op(Q)*C or C*op(Q) where Q comes from sytrd