https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103750
--- Comment #2 from Hongtao.liu <crazylht at gmail dot com> ---
Failed here
/* Allow propagations into a loop only for reg-to-reg copies, since
replacing one register by another shouldn't increase the cost. */
struct loop *def_loop = def_insn->bb ()->cfg_bb ()->loop_father;
struct loop *use_loop = use->bb ()->cfg_bb ()->loop_father;
if ((reg_prop_only || def_loop != use_loop)
&& (!reg_single_def_p (dest) || !reg_single_def_p (src)))
return false;
But def_loop is inner loop of use_loop, it should be ok to propagate from inner
loop to outer loop.
