gcc/testsuite/gcc.dg/tree-ssa/pr20913.c

   1 /* PR tree-optimization/20913
   2    COPY-PROP did not fold COND_EXPR, blocking some copy propagation
   3    opportunities.  */
   4
   5 /* { dg-do link } */
   6 /* { dg-options "-O2 -fno-tree-dominator-opts" } */
   7
   8 int
   9 foo (int a, int b, int c, int d)
  10 {
  11   int x, y;
  12
  13   b = a;
  14   if (a == b)
  15     x = c;
  16   else
  17     {
  18       link_error ();
  19       x = d;
  20     }
  21
  22   if (x == c)
  23     return a;
  24   else
  25     {
  26       link_error ();
  27       return b;
  28     }
  29 }
  30
  31 main()
  32 {
  33   foo (1, 2, 3, 4);
  34 }