gcc/testsuite/gcc.dg/vect/vect-35.c

   1 /* { dg-require-effective-target vect_int } */
   2
   3 #include <stdarg.h>
   4 #include "tree-vect.h"
   5
   6 #define N 16
   7
   8 int main1 ()
   9 {
  10   union {
  11     char a[N] __attribute__ ((__aligned__(16)));
  12     char b[N] __attribute__ ((__aligned__(16)));
  13   } s;
  14   int i;
  15
  16   /* Initialization.  */
  17   for (i = 0; i < N; i++)
  18     {
  19       s.b[i] = 3*i;
  20     }
  21
  22   /* Can't vectorize - dependence analysis fails cause s.a and s.b may
  23      overlap.  */
  24   for (i = 0; i < N; i++)
  25     {
  26       s.a[i] = s.b[i] + 1;
  27     }
  28
  29   /* check results:  */
  30   for (i = 0; i < N; i++)
  31     {
  32       if (s.a[i] != 3*i + 1)
  33         abort ();
  34     }
  35
  36   return 0;
  37 }
  38
  39 int main (void)
  40 {
  41   check_vect ();
  42
  43   return main1 ();
  44 }
  45
  46
  47 /* { dg-final { scan-tree-dump-times "vectorized 1 loops" 1 "vect" { xfail *-*-* } } } */
  48 /* { dg-final { scan-tree-dump-times "can't determine dependence between" 1 "vect" } } */
  49 /* { dg-final { cleanup-tree-dump "vect" } } */