[Bug c++/48809] [4.4/4.5/4.6/4.7 Regression] switch statement optimization error

[jakub at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48809

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2011.04.28 18:50:45
                 CC|                            |jakub at gcc dot gnu.org
   Target Milestone|---                         |4.4.7
            Summary|switch statement            |[4.4/4.5/4.6/4.7
                   |optimization error          |Regression] switch
                   |                            |statement optimization
                   |                            |error
     Ever Confirmed|0                           |1

--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-04-28 
18:50:45 UTC ---
Confirmed, goes away with -fno-tree-switch-conversion.

extern void abort (void);

int
foo (signed char x)
{
  int y = 0;
  switch (x)
    {
    case 0: y = 1; break;
    case 1: y = 2; break;
    case 2: y = 3; break;
    case 3: y = 4; break;
    case 4: y = 5; break;
    case 5: y = 6; break;
    case 6: y = 7; break;
    case 7: y = 8; break;
    case 8: y = 9; break;
    case 9: y = 10; break;
    case 10: y = 11; break;
    case 11: y = 12; break;
    case 12: y = 13; break;
    case 13: y = 14; break;
    case 14: y = 15; break;
    case 15: y = 16; break;
    case 16: y = 17; break;
    case 98: y = 18; break;
    case -62: y = 19; break;
    }
  return y;
}

int
main ()
{
  signed char x = 98;
  if (foo (x) != 18)
    abort ();
}

Will look at it tomorrow.