[Bug tree-optimization/18076] Missed jump threading optimization

[pinskia at gcc dot gnu dot org]

------- Additional Comments From pinskia at gcc dot gnu dot org  2004-10-20 14:35 
-------
If I make the x variable a paramater and y a variable (return y so that y is still 
used) then it works on the 
tree level so this is an aliasing causing missed optimization.
Aka this works:
int
foo (int x)
{
 int y =-1;
 if ((x & 0x00000001) || (x & 0x00004000))
    y = 0;
  if ((x & 0x00000001) || (x & 0x00004000))
    y = 1;
  if ((x & 0x00000001) || (x & 0x00004000))
    y = 2;
  if ((x & 0x00000001) || (x & 0x00004000))
    y = 3;
  if ((x & 0x00000001) || (x & 0x00004000))
    y = 4;
  return y;
}

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
     Ever Confirmed|                            |1
           Keywords|                            |alias
   Last reconfirmed|0000-00-00 00:00:00         |2004-10-20 14:35:09
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18076