[Bug rtl-optimization/83565] RTL combine pass breaks shift result (at least on ia64)

[segher at gcc dot gnu.org]

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 ;-) )