gcc/testsuite/gcc.dg/tree-ssa/pr25501.c

   1 /* PR tree-optimization/25501
   2    The PHI merge pass used to try to merge PHI nodes that cannot
   3    actually merged, causing a segfault later.  Make sure that does not
   4    happen any more.  */
   5
   6 /* { dg-options "-O1 -fdump-tree-mergephi" } */
   7
   8 int
   9 foo (int a)
  10 {
  11   int b;
  12   int c;
  13   int d;
  14
  15   if (a == 2)
  16     b = 3;
  17   else
  18     b = 5;
  19
  20   c = 7;
  21
  22   d = 11;
  23
  24   for (;;)
  25     {
  26       if (d == 5)
  27         break;
  28
  29       d = b;
  30     }
  31
  32   return 13;
  33 }
  34
  35 /* { dg-final { scan-tree-dump-times "Removing basic block" 0 "mergephi1"} } */
  36 /* { dg-final { cleanup-tree-dump "mergephi\[1-2\]" } } */