[Bug target/110088] [avr] Improve operation with const on l-reg after move from d-reg

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110088

--- Comment #2 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Georg-Johann Lay
<gjl@gcc.gnu.org>:

https://gcc.gnu.org/g:7cbaf2f96ec884d60e02d5d2a8a2f44ae0d390fd

commit r13-7408-g7cbaf2f96ec884d60e02d5d2a8a2f44ae0d390fd
Author: Georg-Johann Lay <avr@gjlay.de>
Date:   Fri Jun 2 12:41:07 2023 +0200

    target/110088: Improve operation of l-reg with const after move from d-reg.

    After reload, there may be sequences like
       lreg = dreg
       lreg = lreg <op> const
    with an LD_REGS dreg, non-LD_REGS lreg, and <op> in PLUS, IOR, AND.
    If dreg dies after the first insn, it is possible to use
       dreg = dreg <op> const
       lreg = dreg
    instead which is more efficient.

    gcc/
            PR target/110088
            * config/avr/avr.md: Add an RTL peephole to optimize operations on
            non-LD_REGS after a move from LD_REGS.
            (piaop): New code iterator.