[Bug tree-optimization/37102] [4.3/4.4 Regression] possible integer codegen bug

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

------- Comment #1 from rguenth at gcc dot gnu dot org  2008-08-13 09:53 -------
-fno-unswitch-loops fixes the original testcase but not the following which
only fails _with_ -O3 -fno-unswitch-loops.

extern void abort (void);

unsigned int g_24;
unsigned int g_37 = 1;
unsigned int g_225 = 0;

int main ()
{
  unsigned int l_289;
  for (l_289 = 1; l_289 < 5; l_289 += 1) {
      if (g_225) {
          g_24 = g_37;
      }
  }
  g_24 = g_37;
  unsigned int context = g_24 << 1;
  do {
      if (context)
        context = (context << 1) ^ 1;
  } while (0);
  if (context != 5)
    abort ();
  return 0;
}


-- 

rguenth at gcc dot gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rguenth at gcc dot gnu dot
                   |                            |org
             Status|UNCONFIRMED                 |NEW
          Component|c                           |tree-optimization
     Ever Confirmed|0                           |1
  GCC build triplet|i686-pc-linux-gnu           |
   GCC host triplet|i686-pc-linux-gnu           |
 GCC target triplet|i686-pc-linux-gnu           |
           Keywords|                            |wrong-code
      Known to fail|                            |4.3.1 4.4.0
      Known to work|                            |4.2.4
   Last reconfirmed|0000-00-00 00:00:00         |2008-08-13 09:53:31
               date|                            |
            Summary|possible integer codegen bug|[4.3/4.4 Regression]
                   |                            |possible integer codegen bug
   Target Milestone|---                         |4.3.2


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37102