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

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