[Bug middle-end/22057] [4.0/4.1 Regression] Poor -O0 debug information for for loops with no initializer

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

------- Additional Comments From pinskia at gcc dot gnu dot org  2005-06-14 13:21 -------
Confirmed, I thought the gimplifier would have to change but it is not that.
If we look at .eh (via -fdump-tree-all-lineno), we see that there is a goto with the lineno of 10:
  [t.c : 7] j = 0;
  [t.c : 7] goto <D1243>;
  <D1242>:;
  [t.c : 8] j.0 = j;
  [t.c : 8] D.1249 = (unsigned char) j;
  [t.c : 8] block[j.0] = D.1249;
  [t.c : 7] j = j + 1;
  <D1243>:;
  [t.c : 7] if ([t.c : 7] j <= 3) [t.c : 7] goto <D1242>; else [t.c : 7] goto <D1244>;
  <D1244>:;
  [t.c : 10] goto <D1246>;  /// <--- here
  <D1245>:;
  [t.c : 11] j.1 = j;
  [t.c : 11] D.1251 = (unsigned char) j;
  [t.c : 11] block[j.1] = D.1251;
  [t.c : 10] j = j + 1;
  <D1246>:;
  [t.c : 10] if ([t.c : 10] j <= 5) [t.c : 10] goto <D1245>; else [t.c : 10] goto <D1247>;
  <D1247>:;
  [t.c : 12] return;

So it is just tree CFG cleanup which is causing this.

-- 
           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pinskia at gcc dot gnu dot
                   |                            |org, hubicka at gcc dot gnu
                   |                            |dot org
             Status|UNCONFIRMED                 |NEW
          Component|debug                       |middle-end
     Ever Confirmed|                            |1
  GCC build triplet|i686-pc-linux-gnu           |
   GCC host triplet|i686-pc-linux-gnu           |
 GCC target triplet|i686-pc-linux-gnu           |
   Last reconfirmed|0000-00-00 00:00:00         |2005-06-14 13:21:45
               date|                            |


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22057