[Bug tree-optimization/52091] [4.7 Regression] ICE: verify_gimple failed

[pinskia at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52091

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2012-02-02
               Host|x86_64-unknown-linux-gnu    |
     Ever Confirmed|0                           |1
              Build|x86_64-unknown-linux-gnu    |

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-02-02 
04:53:25 UTC ---
Confirmed reduced testcase:
int b,c,d,f;
unsigned h;

void fn52 (void)
{
  for (f = 4; f; f--)
    {
      h &= (unsigned short)d;
      for (b = 0; b <= 1; b++)
      {
       c = 0;
       d &= 1;
      }
    }
}
---- CUT ----

Note also:
int b,c,d,f;
unsigned h;

void fn52 (void)
{
  for (f = 4; f; f--)
    {
      h &= d;
      for (b = 0; b <= 1; b++)
      {
       c = 0;
       d &= 1;
      }
    }
}
---- CUT ----
Gives a slightly different ICE:
t.c: In function ‘fn52’:
t.c:4:6: internal compiler error: in get_initial_def_for_reduction, at
tree-vect-loop.c:3391
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.