gcc/testsuite/gcc.dg/vect/pr60276.c

   1 /* { dg-do run } */
   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   foo (out + 2, lp + 1, 48);
  43   foo_novec (out2 + 2, lp + 1, 48);
  44
  45   for (s = 0; s < 49; s++)
  46     if (out[s] != out2[s])
  47       abort ();
  48
  49   return 0;
  50 }
  51
  52 /* { dg-final { cleanup-tree-dump "vect" } } */