[Bug tree-optimization/93586] [10 Regression] wrong code at -O1 on x86_64-linux-gnu

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93586

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Priority|P3                          |P1
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2020-02-05
                 CC|                            |jakub at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Confirmed.  We can avoid some of the reduction obfuscation:
short a;

int
main ()
{
  char c[1][4][1] = { { { 7 }, { 0 }, { 5 }, { 5 } } };
  for (int b = 0; b <= 3; b++)
    for (a = 0; a >= 0; a--)
      if (c[a][b][a])
        break;
  if (a)
    __builtin_abort ();
  return 0;
}