gcc/testsuite/gcc.dg/vect/vect-outer-1b.c

   1 /* { dg-do compile } */
   2
   3 #define N 40
   4 signed short image[N][N];
   5 signed short block[N][N];
   6 signed short out[N];
   7
   8 /* Outer-loop cannot get vectorized because of non-consecutive access.  */
   9
  10 void
  11 foo (){
  12   int i,j;
  13   int diff;
  14
  15   for (i = 0; i < N; i++) {
  16     diff = 0;
  17     for (j = 0; j < N; j+=4) {
  18       diff += (image[i][j] - block[i][j]);
  19     }
  20     out[i]=diff;
  21   }
  22 }
  23
  24 /* { dg-final { scan-tree-dump-times "OUTER LOOP VECTORIZED" 1 "vect" { xfail *-*-* } } } */
  25 /* { dg-final { scan-tree-dump-times "strided access in outer loop" 1 "vect" } } */
  26 /* { dg-final { cleanup-tree-dump "vect" } } */