gcc/testsuite/gcc.misc-tests/bprob-2.c

   1 /* { dg-require-effective-target label_values } */
   2
   3 /* Test profile-directed block ordering with computed gotos.
   4  *
   5    This is the same as test gcc.c-torture/execute/980526-1.c and
   6    gcc.misc-tests/gcov-3.c */
   7
   8 extern void abort (void);
   9 extern void exit (int);
  10
  11 int expect_do1 = 1, expect_do2 = 2;
  12
  13 static int doit(int x){
  14   __label__ lbl1;
  15   __label__ lbl2;
  16   static int jtab_init = 0;
  17   static void *jtab[2];
  18
  19   if(!jtab_init) {
  20     jtab[0] = &&lbl1;
  21     jtab[1] = &&lbl2;
  22     jtab_init = 1;
  23   }
  24   goto *jtab[x];
  25 lbl1:
  26   return 1;
  27 lbl2:
  28   return 2;
  29 }
  30
  31 static void do1(void) {
  32   if (doit(0) != expect_do1)
  33     abort ();
  34 }
  35
  36 static void do2(void){
  37   if (doit(1) != expect_do2)
  38     abort ();
  39 }
  40
  41 int main(void){
  42   do1();
  43   do2();
  44   exit(0);
  45 }