[Bug middle-end/20290] [4.0/4.1 Regression] Miscompilation on ppc with -Os

[jakub at gcc dot gnu dot org]

------- Additional Comments From jakub at gcc dot gnu dot org  2005-03-02 21:16 
-------
It seems loop_iterations incorrectly counts number of iterations of the second
loop:
  ivtmp.2 = 113;
  goto <bb 4> (<L4>);

<L3>:;
  *(ivtmp.52 + 4294967292B) = 9;
  i = i + 1;

<L4>:;
  ivtmp.2 = ivtmp.2 - 1;
  ivtmp.52 = ivtmp.52 + 4B;
  if (ivtmp.2 != 0) goto <L3>; else goto <L16>;

<L16>:;

loop's n_iterations is 113, but only the loop header is executed 113 times,
while the loop body is executed only 112 times.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
         AssignedTo|unassigned at gcc dot gnu   |jakub at gcc dot gnu dot org
                   |dot org                     |
             Status|NEW                         |ASSIGNED
   Last reconfirmed|2005-03-02 20:40:05         |2005-03-02 21:16:56
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20290