[Bug debug/106746] [13 Regression] '-fcompare-debug' failure (length) with -O2 -fsched2-use-superblocks since r13-2041-g6624ad73064de241

[cvs-commit at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106746

--- Comment #19 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Alexandre Oliva <aoliva@gcc.gnu.org>:

https://gcc.gnu.org/g:3c99493bf39a7fef9213e6f5af94b78bb15fcfdc

commit r13-5252-g3c99493bf39a7fef9213e6f5af94b78bb15fcfdc
Author: Alexandre Oliva <oliva@adacore.com>
Date:   Thu Jan 19 01:09:15 2023 -0300

    [PR106746] drop cselib addr lookup in debug insn mem

    The testcase used to get scheduled differently depending on the
    presence of debug insns with MEMs.  It's not clear to me why those
    MEMs affected scheduling, but the cselib pre-canonicalization of the
    MEM address is not used at all when analyzing debug insns, so the
    memory allocation and lookup are pure waste.  Somehow, avoiding that
    waste fixes the problem, or makes it go latent.


    for  gcc/ChangeLog

            PR debug/106746
            * sched-deps.cc (sched_analyze_2): Skip cselib address lookup
            within debug insns.

    for  gcc/testsuite/ChangeLog

            PR debug/106746
            * gcc.target/i386/pr106746.c: New.