gcc/testsuite/gcc.dg/tree-ssa/ssa-dom-cse-3.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O -fno-tree-fre -fdump-tree-dom2" } */
   3
   4 extern void abort (void);
   5
   6 int a;
   7 int __attribute__((noinline))
   8 foo (int b)
   9 {
  10   a = 0;
  11   if (b)
  12     {
  13       a = 1;
  14       return a;
  15     }
  16   /* DOM should be able to CSE both loads here, forwarding 0 and 1
  17      to the PHI feeding the return.  */
  18   return a;
  19 }
  20
  21 int
  22 main()
  23 {
  24   if (foo (0) != 0
  25       || foo (1) != 1)
  26     abort ();
  27   return 0;
  28 }
  29
  30 /* { dg-final { scan-tree-dump "= PHI <\[01\]\\\(.\\\), \[01\]\\\(.\\\)>" "dom2" } } */