[Bug rtl-optimization/105586] [11/12/13 Regression] -fcompare-debug failure (length) with -O2 -fno-if-conversion -mtune=power4 -fno-guess-branch-probability

["cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105586

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Surya Kumari Jangala
<jskumari@gcc.gnu.org>:

https://gcc.gnu.org/g:bec35caafae8db0278e1d037a7ba00c3e6899bbd

commit r13-2525-gbec35caafae8db0278e1d037a7ba00c3e6899bbd
Author: Surya Kumari Jangala <jskumari@linux.ibm.com>
Date:   Tue Aug 2 23:00:03 2022 -0500

    sched1: Fix -fcompare-debug issue in schedule_region [PR105586]

    In schedule_region(), a basic block that does not contain any real insns
    is not scheduled and the dfa state at the entry of the bb is not copied
    to the fallthru basic block. However a DEBUG insn is treated as a real
    insn, and if a bb contains non-real insns and a DEBUG insn, it's dfa
    state is copied to the fallthru bb. This was resulting in
    -fcompare-debug failure as the incoming dfa state of the fallthru block
    is different with -g. We should always copy the dfa state of a bb to
    it's fallthru bb even if the bb does not contain real insns.

    2022-08-22  Surya Kumari Jangala  <jskumari@linux.ibm.com>

    gcc/
            PR rtl-optimization/105586
            * sched-rgn.cc (save_state_for_fallthru_edge): New function.
            (schedule_region): Use it for all blocks.

    gcc/testsuite/
            PR rtl-optimization/105586
            * gcc.target/powerpc/pr105586.c: New test.