1  #include "tree-vect.h"
       2  
       3  extern void abort (void);
       4  
       5  static void 
       6  foo (int *out, const int *lp, unsigned samples)
       7  {
       8    int x, target;
       9    for (x = 0, target = 0; x < (int)samples; x += 2, target++)
      10      {
      11        out[x] = lp[target];
      12        out[x - 1] = out[x - 2] + out[x];
      13      }
      14  }
      15  
      16  static void 
      17  foo_novec (int *out, const int *lp, unsigned samples)
      18  {
      19    int x, target;
      20    for (x = 0, target = 0; x < (int)samples; x += 2, target++)
      21      {
      22        out[x] = lp[target];
      23        out[x - 1] = out[x - 2] + out[x];
      24        __asm__ volatile ("" : : : "memory");
      25      }
      26  }
      27  
      28  int main(void)
      29  {
      30    const int lp[25] = {
      31        0, 2, 4, 6, 8,
      32        10, 12, 14, 16,
      33        18, 20, 22, 24,
      34        26, 28, 30, 32,
      35        34, 36, 38, 40,
      36        42, 44, 46, 48,
      37    };
      38    int out[49] = {0};
      39    int out2[49] = {0};
      40    int s;
      41  
      42    check_vect ();
      43  
      44    foo (out + 2, lp + 1, 48);
      45    foo_novec (out2 + 2, lp + 1, 48);
      46  
      47    for (s = 0; s < 49; s++)
      48      if (out[s] != out2[s])
      49        abort ();
      50  
      51    return 0;
      52  }
      53