https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69291
--- Comment #9 from Richard Biener <rguenth at gcc dot gnu.org> ---
Ah, of course
/* If we have x := test ? x + 3 : x + 4 then move the original
x out of the way while we store flags. */
if (common && reg_mentioned_p (if_info->x, common))
{
common = gen_reg_rtx (mode);
noce_emit_move_insn (common, if_info->x);
}
can't work - we'll overwrite 'common' here.
/* If we have x := test ? x + 3 : x + 4 then move the original
x out of the way while we store flags. */
if (common && reg_mentioned_p (if_info->x, common))
{
rtx tem = gen_reg_rtx (mode);
noce_emit_move_insn (tem, common);
common = tem;
}
does. Of course that insn might not be recognizable. The above fixes the ruby
failure for me.
