https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121340
Bug ID: 121340
Summary: [avr] Fix some fallout from insn combine
Product: gcc
Version: 15.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: gjl at gcc dot gnu.org
Target Milestone: ---
Insn combine may come up with superfluous reg-reg moves, where the combine
people say that these are no problem since reg-alloc is supposed to optimize
them. The issue is that the lower-subreg pass sitting between combine and
reg-alloc may split such moves, coming up with a zoo of subregs which are
only handled poorly by the register allocator.
