gcc/testsuite/gcc.dg/pr46685.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target freorder } */
   3 /* { dg-require-effective-target fpic } */
   4 /* { dg-options "-O2 -freorder-blocks-and-partition -fpic" } */
   5
   6 __attribute__((noinline, noclone))
   7 void bar (void *x)
   8 {
   9   asm volatile ("" : : "r" (x) : "memory");
  10 }
  11
  12 __attribute__((noinline, noclone))
  13 void baz (void)
  14 {
  15   asm volatile ("" : : : "memory");
  16 }
  17
  18 __attribute__((noinline, noclone))
  19 int foo (int x)
  20 {
  21   __label__ lab;
  22   if (__builtin_expect (x, 0))
  23     {
  24       lab:
  25       baz ();
  26       return 2;
  27     }
  28   bar (&&lab);
  29   return 1;
  30 }
  31
  32 int
  33 main (void)
  34 {
  35   int x, i;
  36   asm volatile ("" : "=r" (x) : "0" (0));
  37   for (i = 0; i < 1000000; i++)
  38     foo (x);
  39   return 0;
  40 }