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From: "acoplan at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/100523] New: [11/12 Regression] armv8.1-m.main
 -fcompare-debug failure with -O -fmodulo-sched -mtune=cortex-a53
Date: Tue, 11 May 2021 14:39:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100523

            Bug ID: 100523
           Summary: [11/12 Regression] armv8.1-m.main -fcompare-debug
                    failure with -O -fmodulo-sched -mtune=3Dcortex-a53
           Product: gcc
           Version: 12.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: acoplan at gcc dot gnu.org
  Target Milestone: ---

The following fails:

$ cat test.c
int main_j;
int main() {
  long crc;
  for (; main_j; main_j--)
    if (crc)
      crc =3D crc >> 1 ^ 20;
}
$ ./arm-eabi-gcc -c test.c -fcompare-debug -O -fmodulo-sched
-march=3Darmv8.1-m.main -mfloat-abi=3Dsoft -mtune=3Dcortex-a53
arm-eabi-gcc: error: test.c: '-fcompare-debug' failure

Obviously the choice of scheduling isn't sensible for this -march, but it
reveals a bug in any case.=