gcc/testsuite/gcc.dg/torture/pr93868.c

   1 /* { dg-do run } */
   2 /* { dg-additional-options "-ftree-vectorize" } */
   3
   4 unsigned a[1024];
   5 unsigned b[1024];
   6
   7 void __attribute__((noipa))
   8 foo (unsigned *q, unsigned *r)
   9 {
  10   unsigned sum1 = 0, sum2 = 0;
  11   for (int i = 0; i < 512; ++i)
  12     {
  13       sum1 += a[2*i];
  14       sum2 += a[2*i+1];
  15       b[2*i] = a[2*i+1];
  16       b[2*i+1] = a[2*i];
  17     }
  18   *q = sum1;
  19   *r = sum2;
  20 }
  21
  22 int main()
  23 {
  24   unsigned sum1, sum2;
  25   a[0] = 0;
  26   a[1] = 1;
  27   foo (&sum1, &sum2);
  28   if (b[0] != 1 || b[1] != 0)
  29     __builtin_abort ();
  30   return 0;
  31 }