[Bug tree-optimization/87415] [9 Regression] wrong code at -O1 and above on x86_64-linux-gnu

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87415

Martin Liška <marxin at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2018-09-25
                 CC|                            |aldyh at gcc dot gnu.org,
                   |                            |marxin at gcc dot gnu.org
      Known to work|                            |8.2.0
            Version|unknown                     |9.0
   Target Milestone|---                         |9.0
            Summary|wrong code at -O1 and above |[9 Regression] wrong code
                   |on x86_64-linux-gnu         |at -O1 and above on
                   |                            |x86_64-linux-gnu
     Ever confirmed|0                           |1
      Known to fail|                            |9.0

--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, started with r264307.

Better test-case:

cat pr87415.c
struct A
{
  int b:1;
};

int d;

int main ()
{
  struct A e = { 0 };
  if (!d)
    e.b = -1;
  if (!e.b)
    __builtin_abort ();

  return 0;
}