gcc/testsuite/gcc.dg/pr20100.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2" } */
   3
   4 int func_pure (void) __attribute__ ((pure));
   5 void func_other (int);
   6 int global_int;
   7 void abort ();
   8 void func_other(int a)
   9 {
  10   if (a != global_int)
  11    abort ();
  12   global_int++;
  13 }
  14
  15 int func_pure(void)
  16 {
  17   return global_int;
  18 }
  19
  20 int
  21 func_loop (int arg)
  22 {
  23  // global_int ++;
  24   while (arg--)
  25       func_other (func_pure ());
  26 }
  27
  28 int main(void)
  29 {
  30   func_loop(10);
  31   return 0;
  32 }