SPV_ROWLEN
ocs_free(os, a, SPV_ROWLEN*sizeof(*a));
_spv_del(spv->os, spv->array, SPV_ROWLEN, SPV_DIM);
spv->max_idx *= SPV_ROWLEN;
sv->array = (alloc_new_rows ? spv_new_row(sv->os, SPV_ROWLEN) : NULL);
p[a] = (alloc_new_rows ? spv_new_row(sv->os, SPV_ROWLEN) : NULL);
p[b] = (alloc_new_rows ? spv_new_row(sv->os, SPV_ROWLEN) : NULL);