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From: "acoplan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/100533] New: [10/11/12 Regression] aarch64:
 -fcompare-debug failure with -O -fmodulo-sched
Date: Tue, 11 May 2021 16:09:55 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100533

            Bug ID: 100533
           Summary: [10/11/12 Regression] aarch64: -fcompare-debug failure
                    with -O -fmodulo-sched
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

The following fails:

$ cat test.cc
short arr_747[7][15];
void init() {
  for (long i_0 =3D 0; i_0 < 2; ++i_0)
    for (long i_1 =3D 0; i_1 < 14; ++i_1)
      arr_747[i_0][i_1] =3D 1;
}
$ aarch64-linux-gnu-gcc -c test.cc -fcompare-debug -O -fmodulo-sched
aarch64-linux-gnu-gcc: error: test.cc: =E2=80=98-fcompare-debug=E2=80=99 fa=
ilure

Maybe related to PR100523 in that both require -fmodulo-sched (although it's
not clear at this stage).=