gcc/testsuite/gcc.dg/pr20017.c

   1 /* PR rtl-optimization/20017
   2
   3    After CSE/GCSE folds a switch statement to an unconditional jump,
   4    cfg_cleanup did not remove a dead jump table, confusing the CFG
   5    layout code later on.  */
   6
   7 /* { dg-do compile } */
   8 /* { dg-options "-O1" } */
   9 /* { dg-options "-O1 -march=i386" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
  10
  11 int
  12 foo (int *buf, int *p)
  13 {
  14   int result;
  15   const int *tmp;
  16
  17   if (*buf)
  18     return 1;
  19
  20   result = 2;
  21   *buf = 2;
  22   tmp = buf;
  23   switch (*tmp)
  24     {
  25     case 3:
  26     case 4:
  27     case 6:
  28     case 14:
  29       return 1;
  30
  31     case 0:
  32       result = *p;
  33
  34       /* Fall through.  */
  35     default:
  36       if (result)
  37         return 1;
  38     }
  39
  40   return 0;
  41 }