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Subject: [Bug rtl-optimization/97705] [11 regression]
 cc.c-torture/unsorted/dump-noaddr.c.*r.ira fails after r11-4637
Date: Mon, 09 Nov 2020 04:28:59 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97705

--- Comment #5 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Kewen Lin <linkw@gcc.gnu.org>:

https://gcc.gnu.org/g:ce4ae1f4893e322495c5d24b2f0e807a7f7cf92f

commit r11-4827-gce4ae1f4893e322495c5d24b2f0e807a7f7cf92f
Author: Kewen Lin <linkw@linux.ibm.com>
Date:   Sun Nov 8 20:35:21 2020 -0600

    ira: Recompute regstat as max_regno changes [PR97705]

    As PR97705 shows, the commit r11-4637 caused some dumping
    comparison difference error on pass ira.  It exposed one
    issue about the newly introduced function remove_scratches,
    which can increase the largest pseudo reg number if it
    succeeds, later some function will use the max_reg_num()
    to get the latest max_regno, when iterating the numbers
    we can access some data structures which are allocated as
    the previous max_regno, some out of array bound accesses
    can occur, the failure can be random since the values
    beyond the array could be random.

    This patch is to free/reinit/recompute the relevant data
    structures that is regstat_n_sets_and_refs and reg_info_p
    to ensure we won't access beyond some array bounds.

    Bootstrapped/regtested on powerpc64le-linux-gnu P9 and
    powerpc64-linux-gnu P8.

    gcc/ChangeLog:

            PR rtl-optimization/97705
            * ira.c (ira): Refactor some regstat free/init/compute invocati=
on
            into lambda function regstat_recompute_for_max_regno, and call =
it
            when max_regno increases as remove_scratches succeeds.=