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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/107447] New: [13 Regression] ICE:
 verify_flow_info failed (error: returns_twice call is not first in basic
 block 2)
Date: Fri, 28 Oct 2022 02:59:21 +0000
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: tree-optimization
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: asolokha at gmx dot com
X-Bugzilla-Status: UNCONFIRMED
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X-Bugzilla-Priority: P3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107447

            Bug ID: 107447
           Summary: [13 Regression] ICE: verify_flow_info failed (error:
                    returns_twice call is not first in basic block 2)
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com
  Target Milestone: ---

gcc 13.0.0 20221023 snapshot (g:0e37fd4dc74c1db99cdc7d71ef378e1221253c6f) I=
CEs
when compiling the following testcase w/ -O2:

int n;

void
bar (int, int);

__attribute__ ((noinline, returns_twice)) int
zero (void)
{
  return 0;
}

void
foo (void)
{
  (void) zero ();

  n =3D 0;

  for (;;)
    bar (zero (), n);
}

% gcc-13 -O2 -c ozyot3yy.c
ozyot3yy.c: In function 'foo':
ozyot3yy.c:13:1: error: returns_twice call is not first in basic block 2
   13 | foo (void)
      | ^~~
_7 =3D zero ();
during GIMPLE pass: lim
ozyot3yy.c:13:1: internal compiler error: verify_flow_info failed
0xa0dd1d verify_flow_info()
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-13.0.0_p20221023/work/gcc-13-20221023/gcc/cf=
ghooks.cc:284
0xe08403 execute_function_todo
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-13.0.0_p20221023/work/gcc-13-20221023/gcc/pa=
sses.cc:2103
0xe0891e execute_todo
=20=20=20=20=20=20=20
/var/tmp/portage/sys-devel/gcc-13.0.0_p20221023/work/gcc-13-20221023/gcc/pa=
sses.cc:2145=