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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/98331] [8/9/10/11 Regression] ICE in
 haifa_luid_for_non_insn, at haifa-sched.c:7845 since
 r8-5479-g67a8d7199fe4e474
Date: Thu, 28 Jan 2021 11:15:21 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D98331

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|9.4                         |8.5
             Status|NEW                         |ASSIGNED
            Summary|[9/10/11 Regression] ICE in |[8/9/10/11 Regression] ICE
                   |haifa_luid_for_non_insn, at |in haifa_luid_for_non_insn,
                   |haifa-sched.c:7845 since    |at haifa-sched.c:7845 since
                   |r8-5479-g67a8d7199fe4e474   |r8-5479-g67a8d7199fe4e474
           Assignee|unassigned at gcc dot gnu.org      |jakub at gcc dot gn=
u.org

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
When I slightly tweak the testcase, it started with
r8-3191-gc5f597633467c2fc0fa80afa19c99f049fac8466

void bar (const char *);
unsigned long long x;

void
foo (void)
{
  int a =3D 1;
  bar ("foo");
  int b =3D 2;
  __atomic_fetch_add (&x, 1, 0);
  int c =3D 3;
  __builtin_unreachable ();
}=