1850     IS       irows = NULL, icols = NULL;  in MatConvert_IS_XAIJ()  local
1887           PetscCall(ISInvertPermutation(cols, PETSC_DECIDE, &icols));  in MatConvert_IS_XAIJ()
1894         icols = irows;  in MatConvert_IS_XAIJ()
1898       PetscCall(PetscObjectQuery((PetscObject)*M, "_MatIS_IS_XAIJ_icols", (PetscObject *)&icols));  in MatConvert_IS_XAIJ()
1900       if (icols) PetscCall(PetscObjectReference((PetscObject)icols));  in MatConvert_IS_XAIJ()
1902     if (!irows || !icols) {  in MatConvert_IS_XAIJ()
1903       PetscCall(ISDestroy(&icols));  in MatConvert_IS_XAIJ()
1909       PetscCall(MatCreateSubMatrix(B, irows, icols, reuse, M));  in MatConvert_IS_XAIJ()
1911       PetscCall(PetscObjectCompose((PetscObject)*M, "_MatIS_IS_XAIJ_icols", (PetscObject)icols));  in MatConvert_IS_XAIJ()
1915       PetscCall(MatCreateSubMatrix(B, irows, icols, MAT_INITIAL_MATRIX, &C));  in MatConvert_IS_XAIJ()
1919     PetscCall(ISDestroy(&icols));  in MatConvert_IS_XAIJ()