752   PetscCall(PetscMalloc1(27, &dd->neighbors));  in DMSetUp_DA_3D()
754   dd->neighbors[0]  = n0;  in DMSetUp_DA_3D()
755   dd->neighbors[1]  = n1;  in DMSetUp_DA_3D()
756   dd->neighbors[2]  = n2;  in DMSetUp_DA_3D()
757   dd->neighbors[3]  = n3;  in DMSetUp_DA_3D()
758   dd->neighbors[4]  = n4;  in DMSetUp_DA_3D()
759   dd->neighbors[5]  = n5;  in DMSetUp_DA_3D()
760   dd->neighbors[6]  = n6;  in DMSetUp_DA_3D()
761   dd->neighbors[7]  = n7;  in DMSetUp_DA_3D()
762   dd->neighbors[8]  = n8;  in DMSetUp_DA_3D()
763   dd->neighbors[9]  = n9;  in DMSetUp_DA_3D()
764   dd->neighbors[10] = n10;  in DMSetUp_DA_3D()
765   dd->neighbors[11] = n11;  in DMSetUp_DA_3D()
766   dd->neighbors[12] = n12;  in DMSetUp_DA_3D()
767   dd->neighbors[13] = rank;  in DMSetUp_DA_3D()
768   dd->neighbors[14] = n14;  in DMSetUp_DA_3D()
769   dd->neighbors[15] = n15;  in DMSetUp_DA_3D()
770   dd->neighbors[16] = n16;  in DMSetUp_DA_3D()
771   dd->neighbors[17] = n17;  in DMSetUp_DA_3D()
772   dd->neighbors[18] = n18;  in DMSetUp_DA_3D()
773   dd->neighbors[19] = n19;  in DMSetUp_DA_3D()
774   dd->neighbors[20] = n20;  in DMSetUp_DA_3D()
775   dd->neighbors[21] = n21;  in DMSetUp_DA_3D()
776   dd->neighbors[22] = n22;  in DMSetUp_DA_3D()
777   dd->neighbors[23] = n23;  in DMSetUp_DA_3D()
778   dd->neighbors[24] = n24;  in DMSetUp_DA_3D()
779   dd->neighbors[25] = n25;  in DMSetUp_DA_3D()
780   dd->neighbors[26] = n26;  in DMSetUp_DA_3D()