gnu/dist/gcc4/gcc/testsuite/gcc.dg/vect/vect-37.c

   1 /* { dg-require-effective-target vect_int } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 #define N 16
   7 char x[N] __attribute__ ((__aligned__(16)));
   8
   9 int main1 (char *y)
  10 {
  11   struct {
  12     char *p;
  13     char *q;
  14   } s;
  15   char cb[N] __attribute__ ((__aligned__(16))) = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};
  16   int i;
  17
  18   /* Not vectorized - can't antialias the pointer s.p from the array cb.  */
  19   s.p = y;
  20   for (i = 0; i < N; i++)
  21     {
  22       s.p[i] = cb[i];
  23     }
  24
  25   /* check results:  */
  26   for (i = 0; i < N; i++)
  27     {
  28       if (s.p[i] != cb[i])
  29         abort ();
  30     }
  31
  32   /* Not vectorized - can't antialias the pointer s.p from the pointer s.q.  */
  33   s.q = cb;
  34   for (i = 0; i < N; i++)
  35     {
  36       s.p[i] = s.q[i];
  37     }
  38
  39   /* check results:  */
  40   for (i = 0; i < N; i++)
  41     {
  42       if (s.p[i] != s.q[i])
  43         abort ();
  44     }
  45
  46   return 0;
  47 }
  48
  49 int main (void)
  50 {
  51   check_vect ();
  52
  53   return main1 (x);
  54 }
  55
  56 /* Currently the loops fail to vectorize due to aliasing problems.
  57    If/when the aliasing problems are resolved, unalignment may
  58    prevent vectorization on some targets.  */
  59 /* { dg-final { scan-tree-dump-times "vectorized 2 loops" 1 "vect" { xfail *-*-* } } } */
  60 /* { dg-final { scan-tree-dump-times "can't determine dependence between" 2 "vect" } } */
  61 /* { dg-final { cleanup-tree-dump "vect" } } */