gnu/dist/gcc4/gcc/testsuite/gcc.misc-tests/bprob-2.c

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