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 void link_error (void);
   9
  10 int
  11 foo (int a, int b, int c, int d)
  12 {
  13   int x, y;
  14
  15   b = a;
  16   if (a == b)
  17     x = c;
  18   else
  19     {
  20       link_error ();
  21       x = d;
  22     }
  23
  24   if (x == c)
  25     return a;
  26   else
  27     {
  28       link_error ();
  29       return b;
  30     }
  31 }
  32
  33 int
  34 main()
  35 {
  36   foo (1, 2, 3, 4);
  37 }