[Bug tree-optimization/33315] stores not commoned by sinking

["msebor at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=33315

Martin Sebor <msebor at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |msebor at gcc dot gnu.org
         Resolution|---                         |FIXED

--- Comment #8 from Martin Sebor <msebor at gcc dot gnu.org> ---
With today's top of trunk (GCC 7.0) I see the following in the optimized dump. 
The redundant stores seem to have been eliminated (they are still present in
GCC 6).  Therefore resolving as fixed (please reopen if I missed something).

test ()
{
  int i;

  <bb 2> [100.00%]:
  i_8 = num;
  if (i_8 == 1)
    goto <bb 3>; [34.00%]
  else
    goto <bb 6>; [66.00%]

  <bb 3> [34.00%]:
  MEM[(int *)&a] = 0;
  goto <bb 5>; [100.00%]

  <bb 4> [34.00%]:
  MEM[(int *)&a + 4B] = 0;

  <bb 5> [100.00%]:
  MEM[(int *)&a + 8B] = 0;
  return;

  <bb 6> [66.00%]:
  MEM[(int *)&a] = 0;
  if (i_8 == 2)
    goto <bb 4>; [51.52%]
  else
    goto <bb 7>; [48.48%]

  <bb 7> [32.00%]:
  MEM[(int *)&a + 4B] = 0;
  goto <bb 5>; [100.00%]

}