gcc/testsuite/gcc.dg/20030721-1.c

   1 /* PR optimization/11536 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O2" } */
   4 /* Origin: samal@kam.mff.cuni.cz <samal@kam.mff.cuni.cz> */
   5 /* Testcase by Andrew Pinski <pinskia@physics.uc.edu> */
   6
   7 /* Verify that the loop optimizer doesn't use moving targets
   8    to calculate the number of iterations of a loop.  */
   9
  10 extern void abort(void);
  11
  12 void foo(int) __attribute__((__noinline__));
  13
  14 void foo(int i)
  15 {
  16   abort();
  17 }
  18
  19 int main()
  20 {
  21   int i;
  22   int first= 0;
  23   int last= 0;
  24
  25   while (last<3) {
  26     last = first;
  27
  28     while (first<=last) {
  29       first++;
  30
  31       for (i=0;i<3;i++)
  32         last++;
  33
  34       if (last>10)
  35         return 0;
  36     }
  37
  38     foo(first);
  39   }
  40
  41   return 0;
  42 }