gcc/testsuite/gcc.dg/vect/vect-10.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target vect_int } */
   3
   4 #define N 16
   5
   6 short a[N];
   7 short d[N];
   8
   9 int foo ()
  10 {
  11   int i;
  12   short b[N] = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};
  13   short c[N] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};
  14
  15
  16   /* Not vectorizable yet (strided access pattern).  */
  17   for (i = 0; i < N/2; i++)
  18     {
  19       a[i] = b[2*i+1] * c[2*i+1] - b[2*i] * c[2*i];
  20       d[i] = b[2*i] * c[2*i+1] + b[2*i+1] * c[2*i];
  21     }
  22
  23   return 0;
  24 }
  25
  26 /* { dg-final { scan-tree-dump-times "vectorized 0 loops" 1 "vect" } } */