gcc/testsuite/gcc.target/i386/pr81128.c

   1 /* PR ipa/81128 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O3" } */
   4 /* { dg-require-ifunc "" } */
   5
   6
   7 #include <stdio.h>
   8 #include <stdlib.h>
   9 #include <time.h>
  10
  11 int resolver_fn = 0;
  12 int resolved_fn = 0;
  13
  14 static inline void
  15 do_it_right_at_runtime_A ()
  16 {
  17   resolved_fn++;
  18 }
  19
  20 static inline void
  21 do_it_right_at_runtime_B ()
  22 {
  23   resolved_fn++;
  24 }
  25
  26 static inline void do_it_right_at_runtime (void);
  27
  28 void do_it_right_at_runtime (void)
  29   __attribute__ ((ifunc ("resolve_do_it_right_at_runtime")));
  30
  31 static void (*resolve_do_it_right_at_runtime (void)) (void)
  32 {
  33   srand (time (NULL));
  34   int r = rand ();
  35   resolver_fn++;
  36
  37   /* Use intermediate variable to get a warning for non-matching
  38    * prototype. */
  39   typeof(do_it_right_at_runtime) *func;
  40   if (r & 1)
  41     func = do_it_right_at_runtime_A;
  42   else
  43     func = do_it_right_at_runtime_B;
  44
  45   return (void *) func;
  46 }
  47
  48 int
  49 main (void)
  50 {
  51   const unsigned int ITERS = 10;
  52
  53   for (int i = ITERS; i > 0; i--)
  54     {
  55       do_it_right_at_runtime ();
  56     }
  57
  58   if (resolver_fn != 1)
  59     __builtin_abort ();
  60
  61   if (resolved_fn != 10)
  62     __builtin_abort ();
  63
  64   return 0;
  65 }