xdl_fall_back_diff 257 xdiff/xhistogram.c return xdl_fall_back_diff(index->env, &xpp, xdl_fall_back_diff 293 xdiff/xpatience.c return xdl_fall_back_diff(map->env, &xpp, xdl_fall_back_diff 42 xdiff/xutils.h int xdl_fall_back_diff(xdfenv_t *diff_env, xpparam_t const *xpp,