https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66706
Segher Boessenkool <segher at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |ASSIGNED Last reconfirmed| |2015-06-30 Assignee|unassigned at gcc dot gnu.org |segher at gcc dot gnu.org Ever confirmed|0 |1 --- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> --- For some reason when combining the zero_extend with the lshiftrt, combine writes it as the equivalent and-of-subreg. Which doesn't match any existing backend pattern. Confirmed; mine.