1  #include <stdlib.h>
       2  #include <stdio.h>
       3  #include <stddef.h>
       4  #include <altivec.h>
       5  
       6  #define NPAGES 20
       7  #define NSKIP 10
       8  static vector float big[NPAGES*4096/16] = { {1,1,1,1} };
       9  /* NPAGES pages worth.  */
      10  
      11  static int failed;
      12  
      13  static void f(vector float *p)
      14  {
      15    int i = 1;
      16    p = (vector float *)(((ptrdiff_t)p + 4095) & ~4095);
      17  
      18    i += NSKIP;
      19    p += NSKIP*4096/16;
      20  
      21    while (i < NPAGES)
      22      {
      23        if (!vec_all_eq(*p,((vector float){0,0,0,0})))
      24  	{
      25  	  printf("*p isn't zero at 0x%p, page %d\n", p, i);
      26  	  failed++;
      27  	}
      28        i++;
      29        p += 4096/16;
      30      }
      31  }
      32  
      33  int main(void)
      34  {
      35    f(big);
      36    if (failed)
      37      abort ();
      38    return 0;
      39  }