gcc/testsuite/gcc.dg/tree-ssa/ssa-fre-97.c

   1 /* { dg-do compile } */
   2 /* ethread threading does not yet catch this but it might at some point.  */
   3 /* { dg-options "-O -fdump-tree-fre1-details -fno-thread-jumps" } */
   4
   5 int foo (int b, int x)
   6 {
   7   int i, j;
   8   if (b)
   9     i = x;
  10   if (b)
  11     j = x;
  12   return j == i;
  13 }
  14
  15 /* Even with different undefs we should CSE a PHI node with the
  16    same controlling condition.  */
  17
  18 /* { dg-final { scan-tree-dump "Replaced redundant PHI node" "fre1" } } */
  19 /* { dg-final { scan-tree-dump "return 1;" "fre1" } } */