tests/tests2/127_asm_goto.c

   1 static int simple_jump(void)
   2 {
   3   asm goto ("jmp %l[label]" : : : : label);
   4   return 0;
   5 label:
   6   return 1;
   7 }
   8
   9 static int three_way_jump(int val, int *addr)
  10 {
  11   *addr = 42;
  12   asm goto ("cmp $0, %1\n\t"
  13             "jg %l[larger]\n\t"
  14             "jl %l[smaller]\n\t"
  15             "incl %0\n\t"
  16             : "=m" (*addr)
  17             : "r" (val)
  18             :
  19             : smaller, larger);
  20   return 1;
  21 smaller:
  22   return 2;
  23 larger:
  24   return 3;
  25 }
  26
  27 static int another_jump(void)
  28 {
  29   asm goto ("jmp %l[label]" : : : : label);
  30   return 70;
  31   /* Use the same label name as in simple_jump to check that
  32      that doesn't confuse our C/ASM symbol tables */
  33 label:
  34   return 71;
  35 }
  36
  37 extern int printf (const char *, ...);
  38 int main(void)
  39 {
  40   int i;
  41   if (simple_jump () == 1)
  42     printf ("simple_jump: okay\n");
  43   else
  44     printf ("simple_jump: wrong\n");
  45   if (another_jump () == 71)
  46     printf ("another_jump: okay\n");
  47   else
  48     printf ("another_jump: wrong\n");
  49   if (three_way_jump(0, &i) == 1 && i == 43)
  50     printf ("three_way_jump(0): okay\n");
  51   else
  52     printf ("three_way_jump(0): wrong (i=%d)\n", i);
  53   if (three_way_jump(1, &i) == 3 && i == 42)
  54     printf ("three_way_jump(1): okay\n");
  55   else
  56     printf ("three_way_jump(1): wrong (i=%d)\n", i);
  57   if (three_way_jump(-1, &i) == 2 && i == 42)
  58     printf ("three_way_jump(-1): okay\n");
  59   else
  60     printf ("three_way_jump(-1): wrong (i=%d)\n", i);
  61   return 0;
  62 }