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

   1 /* { dg-do compile } */
   2
   3 #define N 64
   4 signed short image[N][N] __attribute__ ((__aligned__(16)));
   5 signed short block[N][N] __attribute__ ((__aligned__(16)));
   6
   7 /* Can't do outer-loop vectorization because of non-consecutive access.
   8    Currently fails to vectorize because the reduction pattern is not
   9    recognized.  */
  10
  11 int
  12 foo (){
  13   int i,j;
  14   int diff = 0;
  15
  16   for (i = 0; i < N; i++) {
  17     for (j = 0; j < N; j+=8) {
  18       diff += (image[i][j] - block[i][j]);
  19     }
  20   }
  21   return diff;
  22 }
  23
  24 /* { dg-final { scan-tree-dump-times "OUTER LOOP VECTORIZED" 1 "vect" { xfail *-*-* } } } */
  25 /* FORNOW */
  26 /* { dg-final { scan-tree-dump-times "strided access in outer loop" 1 "vect" { xfail *-*-* } } } */
  27 /* { dg-final { scan-tree-dump-times "unexpected pattern" 1 "vect" } } */
  28 /* { dg-final { cleanup-tree-dump "vect" } } */