https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83565
--- Comment #9 from Segher Boessenkool <segher at gcc dot gnu.org> --- #0 means subreg 0; in this case, (subreg:DI (reg:SI 357) 0) etc. (The "slim" RTL dumps are lossy in places btw; in _this_ case you can deduce it has to be DImode, but not always. OTOH slim dumps take up less space ;-) )