[Bug target/112918] [m68k] [LRA] ICE: maximum number of generated reload insns per insn achieved (90)

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112918

--- Comment #13 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Vladimir Makarov <vmakarov@gcc.gnu.org>:

https://gcc.gnu.org/g:989e67f827b74b76e58abe137ce12d948af2290c

commit r14-6667-g989e67f827b74b76e58abe137ce12d948af2290c
Author: Vladimir N. Makarov <vmakarov@redhat.com>
Date:   Mon Dec 18 17:12:23 2023 -0500

    [PR112918][LRA]: Fixing IRA ICE on m68k

    Some GCC tests on m68K port of LRA is failed on `maximum number of
    generated reload insns per insn achieved`.  The problem is in that for
    subreg reload LRA can not narrow reg class more from ALL_REGS to
    GENERAL_REGS and then to data regs or address regs.  The patch permits
    narowing reg class from reload insns if this results in succesful
    matching of reg operand.

    gcc/ChangeLog:

            PR rtl-optimization/112918
            * lra-constraints.cc (SMALL_REGISTER_CLASS_P): Move before
in_class_p.
            (in_class_p): Restrict condition for narrowing class in case of
            allow_all_reload_class_changes_p.
            (process_alt_operands): Pass true for
            allow_all_reload_class_changes_p in calls of in_class_p.
            (curr_insn_transform): Ditto for reg operand win.