gcc/testsuite/gcc.dg/pr57154.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fschedule-insns" } */
   3 /* { dg-require-effective-target scheduling } */
   4
   5 #define PF_FROZEN 0x00010000
   6 #define likely(x)      __builtin_expect(!!(x), 1)
   7
   8 struct cur
   9 {
  10   unsigned long flags;
  11 };
  12 struct cur *cur;
  13
  14 unsigned long freeze_cnt;
  15
  16 extern int foo(void *);
  17 extern int slow_path(void *);
  18
  19 static inline int freezing(void *p)
  20 {
  21         if (likely(!foo(&freeze_cnt)))
  22                 return 0;
  23         return slow_path(p);
  24 }
  25
  26 extern int blah(void);
  27
  28 int testcase(int check_kthr_stop)
  29 {
  30   int was_frozen = 0;
  31
  32   for (;;) {
  33     if (!freezing(cur) ||
  34         (check_kthr_stop && blah()))
  35       cur->flags &= ~PF_FROZEN;
  36
  37     if (!(cur->flags & PF_FROZEN))
  38       break;
  39
  40     was_frozen = 1;
  41   }
  42
  43   return was_frozen;
  44 }