[Bug rtl-optimization/112525] fail to eliminate unused store

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112525

--- Comment #7 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Jiu Fu Guo <guojiufu@gcc.gnu.org>:

https://gcc.gnu.org/g:4759383245ac97a5c83c0272f0a831f2a26ea5c1

commit r14-6674-g4759383245ac97a5c83c0272f0a831f2a26ea5c1
Author: Jiufu Guo <guojiufu@linux.ibm.com>
Date:   Tue Dec 19 13:03:06 2023 +0800

    treat argp-based mem as frame related in dse

    The issue mentioned in PR112525 would be able to be handled by
    updating dse.cc to treat arg_pointer_rtx similarly with frame_pointer_rtx.
    https://gcc.gnu.org/bugzilla/show_bug.cgi?id=30271#c10 also mentioned
    this idea.

    And arpg area may be used to pass argument to callee. So, it would
    be needed to check if call insns are using that mem.

            PR rtl-optimization/112525
            PR target/30271

    gcc/ChangeLog:

            * dse.cc (get_group_info): Add arg_pointer_rtx as frame_related.
            (check_mem_read_rtx): Add parameter to indicate if it is checking
mem
            for call insn.
            (scan_insn): Add mem checking on call usage.

    gcc/testsuite/ChangeLog:

            * gcc.target/powerpc/pr112525.c: New test.
            * gcc.target/powerpc/pr30271.c: New test.