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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/105415] New: [10/11/12 Regression] '-fcompare-debug'
 failure w/ -O2 -ftree-parallelize-loops=2
Date: Thu, 28 Apr 2022 02:43:28 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D105415

            Bug ID: 105415
           Summary: [10/11/12 Regression] '-fcompare-debug' failure w/ -O2
                    -ftree-parallelize-loops=3D2
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Keywords: compare-debug-failure
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---
            Target: aarch64-linux-gnu

gcc 12.0.1 20220424 snapshot (g:6b7441a46c771aa6ecdc0c8ed96197417d036b9a) f=
ails
-fcompare-debug check when compiling the following testcase w/ -O2
-ftree-parallelize-loops=3D2:

int m;
static int n;

void
foo (void)
{
  int s =3D 0;

  while (m < 1)
    {
      s +=3D n;
      ++m;
    }
}

void
bar (int *arr, int i)
{
  while (i < 1)
    arr[i++] =3D 1;
}

% aarch64-linux-gnu-gcc-12.0.1 -O2 -fcompare-debug -ftree-parallelize-loops=
=3D2
-c plkjnne3.c
aarch64-linux-gnu-gcc-12.0.1: error: plkjnne3.c: '-fcompare-debug' failure

--- plkjnne3.c.gkd      2022-04-28 09:43:03.113041561 +0700
+++ plkjnne3.gk.c.gkd   2022-04-28 09:43:03.148041580 +0700
@@ -388,7 +388,7 @@
 1:   int i;
 2:   signed int D.xxxx;

-;; Function bar._loopfn.0 (bar._loopfn.0, funcdef_no=3D2, cgraph_uid=3D3,
symbol_order=3D4)
+;; Function bar._loopfn.0 (bar._loopfn.0, funcdef_no=3D2, cgraph_uid=3D3,
symbol_order=3D5)

 (note # 0 0 NOTE_INSN_DELETED)
 (note # 0 0 [bb 2] NOTE_INSN_BASIC_BLOCK)=