gcc/testsuite/gcc.dg/tree-ssa/ivopt_mult_4.c

   1
   2 /* { dg-do compile { target {{ i?86-*-* x86_64-*-* } && lp64 } } } */
   3 /* { dg-options "-O2 -m64 -fdump-tree-optimized" } */
   4
   5 /* iv i's step 16 so its period is smaller than the max iterations
   6  * i.e. replacing if (p2 > p_limit2) with testing of i may result in
   7  * overflow.  */
   8 long foo(long* p, long* p2, int N1, int N2)
   9 {
  10   unsigned long  i = 0;
  11   long* p_limit2 = p2 + N2;
  12   long s = 0;
  13   while (i < N1)
  14     {
  15       p2++;
  16       i += 16;
  17       if (p2 > p_limit2)
  18         break;
  19      s += p[i];
  20   }
  21   return s;
  22 }
  23
  24 /* { dg-final { scan-tree-dump "if \\(.*p_limit2.*\\)" "optimized"} } */